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91 results for “Milky way”
MCMC chain of Milky Way gravitational potential models from McMillan (2017, MNRAS, 465, 76)
<p>These are the full MCMC chains used for the main suite of results from McMillan (2017, MNRAS, 465, 76). Each line gives the parameters of a single model, with some of its derived properties, and an associated weight (the number of steps that the chain stayed at this model). The parameters are described in the README file, and further detail can be found in the original paper.</p> <p>The disc density profiles are of the form</p> <p><span class="math-tex">\(\begin{equation} \rho_d(R,z)=\left\{\begin{array}{lc}\frac{\Sigma(R)}{2z_d}\,\textrm{exp}\left(\frac{-\mid z\mid}{z_d}\right) & \textrm{for }z_d > 0 \\ \frac{\Sigma(R)}{4(-z_d)}\,\textrm{sech}^2\left(\frac{z}{2\,z_d}\right) & \textrm{for } z_d < 0,\\\end{array}\right. \end{equation}\)</span></p> <p>where</p> <p><span class="math-tex">\(\begin{equation} \Sigma(R)=\Sigma_0\;\textrm{exp}\left(-\frac{R_0}{R}-\frac{R}{R_d}+ \epsilon\textrm{cos}\left(\frac{\pi R}{R_d}\right)\right), \end{equation} \)</span></p> <p>with parameters <span class="math-tex">\(\Sigma_0, R_d, z_d, R_0, \epsilon\)</span> (note that <span class="math-tex">\(R_0\)</span> here is not the position of the Sun, and that <span class="math-tex">\(\epsilon\)</span> is not used).</p> <p>Spheroids have </p> <p><span class="math-tex">\(\begin{equation} \rho_s=\frac{\rho_0}{(r^\prime/r_0)^\gamma(1+r^\prime/r_0)^{\beta-\gamma}}\; \textrm{exp}\left[-\left(r^\prime/r_{cut}\right)^2\right], \end{equation} \)</span></p> <p>where</p> <p><span class="math-tex">\(\begin{equation} r^\prime = \sqrt{R^2 + (z/q)^2} \end{equation} \)</span></p> <p>with parameters <span class="math-tex">\( \rho_0, q, \gamma, \beta, r_0, r_{cut}\)</span> (note that <span class="math-tex">\(r_0\)</span> is different again)</p>
A three-dimensional map of the Milky Way using 66,000 Mira variable stars
<p>We provide here full Table 1 from Iwanek, P., et al., 2023, "A three-dimensional map of the Milky Way using 66,000 Mira variable stars", ApJS (accepted for publication, DOI: 10.3847/1538-4365/acad7a), which contains mean magnitudes, distances, extinction values, and photometric chemical types for 65,981 Galactic Miras (Iwanek2023_Table1_GalMirasDist.txt file). The corner plot, i.e., the two-dimensional projections of the multi-dimensional posterior parameter spaces fitted to the Galactic Miras distribution is presented in Figure Iwanek2023_corner_plot.png.</p> <p> </p> <p>Patryk Iwanek is partially supported by Kartezjusz program No. POWR.03.02.00-00-I001/16-00, founded by the National Centre for Research and Development, Poland. Szymon Kozłowski acknowledges the support from the National Science Centre, Poland, via grant OPUS 2018/31/B/ST9/00334. </p> <p>This publication makes use of data products from WISE, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration (NASA). This work is based in part on archival data obtained with the Spitzer Space Telescope, which was operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA.</p>
SEVN parameter file from the paper "Binary neutron star populations in the Milky Way" by Sgalletta et al., 2023
<p>The repository contains the runtime parameters used in the SEVN simulations analysed in the paper "Binary neutron star populations in the Milky Way" by Sgalletta et al., 2023.</p> <p><strong>Repository content: </strong></p> <p>- <em>used_params_Sgalletta2023.txt<br> </em>The file contains all the runtime parameters used in the SEVN simulations. The parameters that have been varied in different runs are indicated with **** and the explored values are reported in the comment. See the SEVN userguide (<a href="https://gitlab.com/sevncodes/sevn/-/blob/SEVN/resources/SEVN_userguide.pdf">https://gitlab.com/sevncodes/sevn/-/blob/SEVN/resources/SEVN_userguide.pdf</a>) for the description of each parameter </p> <p> </p>
Particle Trace of a Milky Way Mass Galaxy from the EAGLE simulations
<p>This repository contains .npy files, loaded like:</p> <pre><code class="language-python">with open('EAGLE_MW_trace_coords.npy', 'rb') as f: coordinates = np.load(f) dmcoordinates = np.load(f) with open('EAGLE_MW_trace_redshifts.npy', 'rb') as f: redshifts = np.load(f)</code></pre> <p>which contain the locations of particles (gas, stars and dark matter) which are within 30pkpc of the centre of a Milky Way stellar mass galaxy from the EAGLE suite of simulations. This dataset was primarily produced to look at the accretion of matter onto galaxies like the Milky Way, studying how they assemble over time, which makes for some quite pretty visualisations <a href="https://github.com/jmackereth/galactic-assembly-art.git">(explored in this repository)</a>.</p> <p>the file 'EAGLE_MW_trace_coords_downsampled_10.npy' contains the same data but for a downsampled set of particles (by a factor of 10).</p>
Data for: Discovery of low-metallicity stars in the central parsec of the Milky Way
<p>Spectroscopic data from Stostad et al. (2015) and Do et al. (2015). This file contains K-band spectra from the Gemini NIFS instrument of stars in the central parsec of the Galactic center. The files are in FITS format. Additional descriptions are in in Stostad et al. (2015). </p> <p>If using this data, please cite Do et al. (2015) and Stostad et al. (2015)</p> <p>https://ui.adsabs.harvard.edu/abs/2015ApJ...808..106S/abstract<br>https://ui.adsabs.harvard.edu/abs/2015ApJ...809..143D/abstract</p> <p> </p> <p>Contributors to the creation of the spectra from this dataset include:</p> <p>Tuan Do</p> <p>Morten Stostad</p>
Milky Way Over H.E.S.S Observatory
<p>Honorable mention in the 2023 IAU OAE Astrophotography Contest, category Still images with smartphones-mobile devices: Milky Way Over H.E.S.S Observatory, by Jianfeng Dai.</p> <p>The darkness of the skies at H.E.S.S Observatory reveal the seemingly innumerable stars that make up the Milky Way galaxy, making it challenging to discern the constellations as seen from Namibia in June 2023. The stars Alpha and Beta Centauri are visible bottom left of the image just about the tower. The orange-hued star visible just above and to the right of the left H.E.S.S telescope is Antares, a red-giant star that is part of the constellation Scorpius. This image receives an honourable mention in the category of Still images taken exclusively with smartphones/mobile devices.</p> <p><strong>Credit</strong>: Jianfeng Dai/IAU OAE (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">CC BY 4.0</a>)</p>
Milky Way Over Quiver Tree
<p>Winner in the 2023 IAU OAE Astrophotography Contest, category Still images with smartphones-mobile devices: Milky Way Over Quiver Tree, by Jianfeng Dai.</p> <p>This breathtaking photograph was captured on 17 June 2023, near Keetmanshoop, Namibia, with a smartphone. Dominating the night sky, the majestic arc of the Milky Way creates a celestial bridge across the heavens. The image captures a range of notable astronomical objects: the Large and Small Magellanic Clouds, seen towards the bottom of the image and appearing as fuzzy clouds; Antares, seen towards the top left of the image; and the coalsack nebula (referred to by various names by Indigenous cultures around the world), seen vertically above the Large Magellanic Cloud. Silhouetted against this astral backdrop, the trees — which are actually succulent aloe plants native to southern Africa — add a touch of Earth's unique beauty. Historically, these plants were known as ‘quiver trees’ because groups of local Indigenous people would use their hollowed branches to hold darts. The serene Namibian landscape, combined with the brilliance of the southern hemisphere's stars, offers a glimpse into the majesty of our Universe.</p> <p>Credit: Jianfeng Dai/IAU OAE (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">CC BY 4.0</a>)</p>
Milky Way Stargazer
<p>Honorable mention in the 2023 IAU OAE Astrophotography Contest, category Still images with smartphones-mobile devices: Milky Way Stargazer, by Jianfeng Dai.</p> <p>In May 2020, atop Mount Gongga in Sichuan, China, a lone observer stands amidst the cool night air at high altitude. Looking up, they witness the grand arc of the Milky Way stretching across the sky, captured using a smartphone set to panorama mode. This image was taken far away from the city lights at an elevation of 4200 metres, where the quiet of the mountains accentuate the connection between Earth and the vast cosmos. Jupiter, a bright planet, can be seen alongside the central bulge of the Milky Way, while a subtle green airglow on the horizon adds an intriguing touch to the scene. The photograph receives an honourable mention in the category of Still images taken exclusively with smartphones/mobile devices.</p> <p><strong>Credit</strong>: Jianfeng Dai/IAU OAE (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">CC BY 4.0</a>)</p>
The Milky Way in the Smart World
<p>Winner in the 2023 IAU OAE Astrophotography Contest, category Still images with smartphones-mobile devices: The Milky Way in the Smart World, by Biagio Meli.</p> <p>In this tranquil image, taken in July 2022 in the darkness of Sicily’s Nebrodi Park, the grandeur of the Milky Way stretches above the natural megaliths of the Argimusco plateau, akin to a Sicilian Stonehenge. This celestial tapestry displays a multitude of astronomical sights: the constellations of Sagittarius (towards the bottom left of the image) and Scorpius (partly obscured by the megalith), the Lagoon Nebula (the pinkish region in the top left of the megalith), and the small Sagittarius Cloud (the fuzzy region in the top left of the Lagoon Nebula). Remarkably, the photo was taken with a smartphone, and serves as a testament to the wonders that lay hidden in the night, accessible to those who venture away from the glare of city lights into the serene embrace of unspoiled darkness.</p> <p>Credit: Biagio Meli/IAU OAE (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">CC BY 4.0</a>)</p>
The data catalog for Metallicity and alpha-abundance for 48 million stars in low-extinction regions in the Milky Way
<p>Stellar chemistry contains information on the environment in which the star was born. Therefore, measuring the chemical abundances of stars in the Milky Way, such as the overall metallicity [M/H] and the alpha-abundance [alpha/M], is essential in Galactic astronomy.</p> <p>We estimate ([M/H], [alpha/M]) for giants and dwarfs in low dust extinction region from the Gaia DR3 XP spectra by using tree-based machine-learning models trained on APOGEE DR17 (Abdurro’uf et al. 2022) and the metal-poor star sample of Li et al. (2022).</p> <p>Here, we upload the catalogues of ([M/H], [alpha/M]) for 182 million stars. The data are divided into 10 fits files. The i-th file (i=1,2,...,10) contains stars with E(B-V) value between 0.1*(i-1) and 0.1*i. Because our machine-learning models are trained on stars with low dust extinction (E(B-V)<0.1), we recommend using 48 million stars with low-dust extinction region with 0<E(B-V)<0.1 (table_light_mh_am_0p0ebv0p1.fits). The description for each column of the data is shown in column_description.png. </p> <p>The source paper of this catalog:</p> <ul> <li>Kohei Hatori "Metallicity and alpha-abundance for 48 million stars in low-extinction regions in the Milky Way" <br>https://iopscience.iop.org/article/10.3847/1538-4357/ad9686</li> </ul> <p>References:</p> <div> <div> <div> <ul> <li>Abdurro’uf, Accetta, K., Aerts, C., et al. 2022, ApJS, 259, 1026 35, doi: 10.3847/1538-4365/ac4414</li> </ul> </div> </div> </div> <ul> <li>Li, H., Aoki, W., Matsuno, T., et al. 2022, ApJ, 931, 147, doi: 10.3847/1538-4357/ac6514</li> </ul> <p> </p>
Utilizing cosmic-ray positron and electron observations to probe the averaged properties of Milky Way pulsars
<p>We include here the Milky Way pulsars simulations that were created and used in "Utilizing cosmic-ray positron and electron observations to probe the averaged properties of Milky Way pulsars" of Cholis & Krommydas 2021. We include both the simulations before fitting to the cosmic-ray observations and the simulations whose electron and positron fluxes have been fitted to the AMS, CALET and DAMPE observations. See paper for further details.</p>
Spectro-photometric distances and self-calibrated abundances for Apogee DR16 RGB stars within the Milky Way disk
<p>The data file contains 48,853 RGB stars from Apogee DR16 within the Milky Way disk, for which we determine spectro-photometric parallax estimates (as described in Hogg et al. 2019, AJ, 158, 147), as well as self-calibrated stellar element abundances. The data set is described in detail and analyzed in Eilers et al. 2022 (arXiv: 2112.03295).</p>
Data for the article "Antaeus: a retrograde group of tidal debris in the Milky Way's disk plane"
<p>This archive contains the data shared in the context of the "Antaeus: a retrograde group of tidal debris in the Milky Way’s disk plane" (Oria et al. 2022) article.</p> <p>The data are under the form of .csv files containing the information on our sample of Antaeus stars from <em>Gaia</em> DR3, with added orbital information derived from the Milky Way potential of McMillan (2017).</p>
The Poor Old Heart of the Milky Way
<p>This is the supplementary dataset to <a href="https://ui.adsabs.harvard.edu/abs/2022arXiv220902722R/abstract">Rix et al. (2022)</a>, containing Gaia DR3 XP-derived parameters for over one million stars towards the Galactic center.</p> <p>xp_gc_mh.csv contains XGBOOST-inferred temperatures, surface gravities, and metallicities for 1.5 million stars. </p> <p>xp_gc_kinematics.csv contains Galactocentric coordinates, actions, and basic orbital parameters for the subset of 1.2 million stars with Gaia DR3 radial velocities. </p>
Supplementary figures for "Dark matter distribution in Milky Way-analog galaxies"
<p>Among the attached files, you will find:</p> <p>- All figures from the article in high-quality PDF format, ordered by name as follows: 'Figure1.pdf' corresponds to Figure 1 of the article, and so on;</p> <p>- Moment 0 (intensity), 1 (velocity), and 2 (dispersion) maps of the atomic hydrogen gas (HI) distribution for each galaxy in our sample. All moment maps were generated from our three-dimensional modeling with 3D-Barolo;</p> <p>- For each galaxy, we show the extended version of Figure 1 from the paper, which includes the intensity, velocity, and dispersion maps for the model and residual of each galaxy. For instance, 'NGC3521_kinematics.pdf' corresponds to the kinematic maps of NGC 3521;</p> <p>- Stellar distribution maps at 3.6 and 4.5 μm provided by the S4G survey. For instance, 'NGC3521.phot.1.fits' corresponds to the 3.6 μm image, while 'NGC3521.phot.2.fits' corresponds to the 4.5 μm image.</p>
Spatially Coherent 3D Distributions of HI and CO in the Milky Way - Data Products
<p>Data products from the joint reconstruction of Galactic HI and H2 (via CO).</p> <h3>Primary data products:</h3> <p>These are the posterior samples of the <strong>"densities"</strong> (HI and H2) in cm^-3 and <strong>"auxiliary"</strong> fields (i.e. the three components of the Galactic velocity field and the two spatially resolved line-widths) in km/s on our Sun-centered HEALPix-times-radius grid. These files also contain two tables with the centres and edges of the pixelisation in radial direction. The nearest (farthest) bin is at approximately 50 pc (28 kpc). The HEALPix dimension is ordered using the "nested" scheme.</p> <ul> <li><em>samples_densities_hpixr.fits </em></li> <li><em>samples_auxiliary_hpixr.fits</em></li> </ul> <h3>Interpolated to a regular grid:</h3> <p>For convenience, we also provide versions linearly interpolated to regular, Cartesian grids. Due to the strongly inhomogeneous original numerical grid, these interpolated versions contain regions of significant over/undersampling. To mitigate this a little, we provide a <strong>"local"</strong> (800 x 800 x 320 grid points with -1.25 kpc < x < 1.25 kpc, -1.25 kpc < y < 1.25 kpc and -0.5 kpc < z < 0.5 kpc) and a <strong>"global"</strong> (1250 x 1250 x 125 grid points with -12 kpc < x < 28 kpc, -20 kpc < y < 20 kpc, -2 kpc < z < 2 kpc) version. The origin (0,0,0) is defined by the position of the Sun and positive x points towards the Galactic centre.</p> <p>In an attempt to keep the file sizes reasonable, we provide the mean and standard deviation of each field instead of all eight individual samples.</p> <ul> <li><em>mean_std_densities_xyz_global.fits</em></li> <li><em>mean_std_densities_xyz_local.fits</em></li> <li><em>mean_std_auxiliary_xyz_global.fits</em></li> <li><em>mean_std_auxiliary_xyz_local.fits</em></li> </ul>
3D Parameter Maps of Red Clump Stars in the Milky Way -- Absolute Magnitudes and Intrinsic Colors
<p>Catalog, application and supplementary figures for the RC paper.</p> <p>1100mRC_WC2021new.fits.zip -- RC catalog</p> <p>Gaia photometric RC sample with 11 million RCs selected based on {\it Gaia}'s EDR3 parallax, our 3D parameter maps, and extinction--distance profile.</p> <p>ra, dec -- position; dm -- distance modulus; av -- V-band extinction</p> <p>dm1 -- corrected distance modulus; av1 -- corrected extinction. used for low-extinction RCs</p> <p>edm -- uncertainty of distance modulus; flag -- 1: high probability RCs, 0: low probability RCs.</p> <p> </p> <p>RC_calculator_linux.zip -- application RC2021 and installer for linux</p> <p>RC_calculator_mac.zip -- application RC2021 and installer for mac </p> <p>The application to estimate the absolute magnitudes and intrinsic colors for RCs with the APOGEE or LAMOST parameters</p> <p> </p> <p>eps -- the best applicable ranges for using application.</p> <p>pd_APOGEE.eps and pd_LAMOST.eps -- Probability densities of each parameter for absolute magnitude training set (orange) and the whole sample (blue). </p> <p>pd_APOGEE_color.eps and pd_LAMOST_color.eps -- Probability densities of each parameter for intrinsic color training set (orange) and the whole sample (blue). </p>
Milky Way Arch over Lut Desert, Iran, by Amirreza Kamkar, Iran (Islamic Republic of)
<p>Second place in the 2021 IAU OAE Astrophotography Contest, category Wide star fields.</p> <p>This panoramic dawn image shows the majestic band of the Milky Way – our home Galaxy – made up of a few hundred billion stars, among other structures, most of which are not detectable by our eyes, or in some cases even directly with telescopes. The appearance of the band is because the Milky Way is a disc-shaped galaxy, and we (Earth/Solar System) are situated within the disc.</p> <p>Diverse cultures and traditions around the world each have their own name and cultural stories for the Milky Way. The dark regions visible in the Milky Way are large, dense, cool nebulae (clouds of dust and gas), which obscure the light from stars in the Milky Way. The Indigenous Australians associate stories with the dark patches of the Milky Way, one of the most prominent being the Emu in the Sky (called Tchingal in Wotjobaluk country). In and around the band of the Milky Way there are a vast range of star clusters, two familiar ones are M6 (Butterfly cluster) and M7 (Ptolemy’s cluster).</p> <p>The bright point just above the horizon is the planet Venus (known to the Boorong people of Indigenous Australia as Chargee Gnowee, elder sister of the Sun). Within the band of the Milky Way the brightest point in the image is the planet Jupiter (called Ginabongbearp, the Sulphur-crested white cockatoo by the Boorong). The planet Saturn is the bright point between Venus and Jupiter (closer to Venus than Jupiter).</p> <p>There are two constellations and one asterism that can be easily discerned in the image: Aquila, Scorpio (Maui’s Hook), and Teapot (asterism in Sagittarius). In this image, the center of the Milky Way at an approximate distance of 26,000 light years from Earth, is located roughly to the top right of the Teapot spout.</p> <p>The bright red-orange point to the right of Jupiter is the red supergiant star Antares and is part of the constellation Scorpio (known as Maui’s Hook in Māori and Polynesian cultures). This variation in the colour of stars is the result of temperature of the stars (lower temperature stars are redder, higher temperatures stars are bluer).</p> <p>Credit: Amirreza Kamkar/IAU OAE</p>
Equatorial Milky Way
<p>Honourable mention in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns: Equatorial Milky Way</p> <p> </p> <p>Taken in Bromo-Tengger-Semeru National Park, Java Island, Indonesia, in March 2016, this image captures regions of the southern Milky Way and, at its left edge, the two planets Mars and Saturn. Mars appears orange and is similar in colour to the star Antares, whose Greek name — anti Ares — references this. Saturn is a little bit fainter than Mars, but clearly visible among the stars of Ophiuchus, above the Pipe Nebula and forming an isosceles triangle with Mars and Antares.</p> <p>Mars is on the top and Saturn is vertically below. Visible to the naked eye, both planets have significance in many cultures around the world. In Roman mythology Mars is the god of war and fertility, and Saturn the god of sowing and agriculture. Its Greek equivalent, the god Kronos, is also considered the regent of completion. Indigenous Australians, including the Kamilaroi and Wailan people, associate Saturn with “wunygal”, a small bird. Mars is called Iherm-penh (something burnt in flames) by the Anmatyerre people of the Central Desert, while the Kokatha people of the Western Desert associate Mars and the star Anatres with the red-tailed black cockatoo (Kogolongo).</p> <p>In the middle of this photograph, the most famous southern constellations are clearly recognisable: the Southern Cross (Crux), the pointer stars, Alpha and Beta Centauri, the dark Coalsack Nebula and the red Eta Carina Nebula, which is not visible to the unaided eye but is prominent in modern photographs. In the 19th century, the star eta Carinae had been the second-brightest star in the sky for some time, but since it varies irregularly, it has hardly been recognisable in recent decades, and its future visibility is unpredictable.</p> <p>Triangulum Australe is visible between the pointer stars and the Scorpion, and in the constellation of Centaurus, the bright globular star cluster Omega Centauri is clearly displayed. It was considered a “nebulous star” since antiquity and, thus, was listed in star catalogues for at least 2000 years. Only within the last century did astronomers discover that globular star clusters are in the halo of our galaxy and that this one consists of roughly 10 million stars.</p> <p>The dark regions in the Milky Way, which are cool, dense clouds of dust and gas, form the head and body of the Celestial Emu Tchingal. Together with the Southern Cross and the pointer stars, they appear in the Dreamtime stories of many Indigenous Australians. One story associated with the Djab Wurrung and the Jardwadjali people is part of a Dreamtime Story involving Tchingal, the Bram-bram-bult brothers (the pointer stars), their mother Druk (Delta Crux), and Bunya the hunter, who gets transformed into a possum (Gacrux, the red star at the top of the Southern Cross).</p> <p>Credit: Giorgia Hofer/IAUOAE (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">CC BY 4.0</a>)</p>
Cen-Lup-Cru-Panorama: Centaurus Carrying the Beast and Riding Along the Milky Way
<p>Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.</p> <p> </p> <p>This image was taken in February 2020 in the Coquimbo Region along the northern coast of Chile. It is one of the best places on Earth for astronomical observations, thanks to its clear skies, lack of light pollution and lack of precipitation, as it is close to the Atacama desert, one of the driest places on our planet. It is no coincidence that many of the most modern professional observatories are located here. The picture shows prominent patterns visible in the southern latitudes, containing rich cultural significance for various Indigenous groups of the southern world. In the bottom of the image towards the right, the Southern Cross is prominent. The orange star at the top of the Southern Cross is called Gacrux (gamma crux). The people in Chile celebrate the beginning of winter at the beginning of May when the constellation Crux is high up in the sky; for them it is a symbol of the start of the cold season. For the festival of the Cruz de Mayo (the Great Cross), they put candles next to crosses in their villages when the constellation Crux is high. As in Christianity, the four endpoints (stars) of the cross symbolise the cardinal virtues. For some indigenous Chileans, they represent the fundamental cultural principles: force, reciprocity, wisdom, and spirituality.</p> <p>Unlike modern constellations that are arrangements of several stars, Indigenous peoples sometimes associate stories with individual stars. In the case of the Southern Cross for example, the Boorong, Djab Wurrung and Jardwadjali peoples of Australia refer to the star Gacrux as Bunya (the ring-tailed possum). From the Southern Cross to the left of the image are two bright stars, these are called the pointer stars (as they point to the Southern Cross). The Djab Wurrung and Jardwadjali people refer to the pointer stars as the Bram-bram-bult brothers, who hunted and killed the giant Emu Tchingal. Alpha Centauri, which is the brighter and whiter of the two pointer stars, is the closest star to the Sun that we can see with our eyes, located just over four light-years away. To the bottom left of the Southern Cross is a dark nebula, which the Indigenous Australians see as the head of the Emu Tchnigal (the Coalsack Nebula). The pointers are located on the neck of the Emu. The image also shows two other IAU constellations, Centaurus (The Centaur) and Lupus (The Wolf), and HII regions of the Eta Carina Nebula (seen in pink).</p> <p>Credit: Uwe Reichert/IAU OAE (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">CC BY 4.0</a>)</p>
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.