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91 results for “Milky way”
The Data For Spatial Variations of Stellar Elemental Abundances in FIRE Simulations of Milky Way-Mass Galaxies: Patterns Today Mostly Reflect Those at Formation
<p>Spatial patterns of stellar elemental abundances encode rich information about a galaxy’s formation<br>history. We analyze the radial, vertical, and azimuthal variations of metals in stars, both today and at<br>formation, in the FIRE-2 cosmological simulations of Milky Way-mass galaxies, and we compare<br>with the Milky Way. Overall, spatial variations of stellar metallicities show only modest differences between formation and today; spatial variations today primarily reflect the conditions of stars at birth, with spatial redistribution of stars after birth contributing secondarily. </p> <p> </p> <p>This data abides by CC-BY.</p>
14. Kepler 62e [Milky way Planets]
<p>14. Kepler 62e [Milky way Planets]</p> <p>In this video, visualization of Kepler 62e is carried out; various positions of Kepler 62e in the space</p>
12. Kepler 442b [Milky way Planets]
<p>12. Kepler 442b [Milky way Planets]</p> <p>In this video, visualization of Kepler 442b is carried out; various positions of Kepler 442b in the space</p>
08. Gliese 667Cf [Milky way Planets]
<p>08. Gliese 667Cf [Milkyway Planets]</p> <p>In this video, visualization of Gliese 667Cf is carried out; various positions of Gliese 667Cf in the space</p>
16. Kepler 186f [Milky way Planets]
<p>16. Kepler 186f [Milky way Planets]</p> <p>In this video, visualization of Kepler 186f is carried out; various positions of Kepler 186f in the space</p>
07. Gliese 667Cc [Milky way Planets]
<p>07. Gliese 667Cc [Milkyway Planets]</p> <p>In this video, visualization of Gliese 667Cc is carried out; various positions of Gliese 667Cc in the space</p>
04. Gliese 163C [Milky way Planets]
<p>04. Gliese 163C [Milky way Planets]</p> <p>In this video, visualization of Gliese 163C is carried out; various positions of Gliese 163C in the space</p>
03. Sun, Mars [Milky way Planets]
<p>03. Sun, Mars [Milky way Planets]</p> <p>In this video, visualization of Sun and Mars is carried out; various positions of Sun and Mars in the space</p>
01. Sun, Earth [Milky way Planets]
<p>01. Sun, Earth [Milky way Planets]</p> <p>In this video, visualization of Sun and Earth is carried out of various positions of Sun and Earth in the space.</p>
22. Wolf 1061c [Milky way Planets]
<p>22. Wolf 1061c [Milky way Planets]</p> <p>In this video, visualization of Wolf 1061c is carried out; various positions of Wolf 1061c in the space</p>
18. Kepler 438b [Milky way Planets]
<p>18. Kepler 438b [Milky way Planets]</p> <p>In this video, visualization of Kepler 438b is carried out; various positions of Kepler 438b in the space</p>
21. Tau Cetie [Milky way Planets]
<p>21. Tau Cetie [Milky way Planets]</p> <p>In this video, visualization of Tau Cetie is carried out; various positions of Tau Cetie in the space</p>
17. Kepler 283c [Milky way Planets]
<p>17. Kepler 283c [Milky way Planets]</p> <p>In this video, visualization of Kepler 283c is carried out; various positions of Kepler 283c in the space</p>
24. Trappist-1d [Milky way Planets]
<p>24. Trappist-1d [Milky way Planets]</p> <p>In this video, visualization of Trappist-1d is carried out; various positions of Trappist-1d in the space</p>
S5: Probing the Milky Way and Magellanic Clouds potentials with the 6-D map of the Orphan-Chenab stream
<p>The data associated with the "S5: Probing the Milky Way and Magellanic Clouds potentials with the 6-D map of the Orphan-Chenab stream" paper. </p> <p> </p> <p>We provide</p> <ul> <li>* the Stan models used to extract stellar stream properties</li> <li>The measurement of radial velocity, stream track on the the sky, proper motions and stream densities for Orphan-Chenab.</li> <li>The list of candidate OC stream members from S5 and other surveys. </li> <li>The best fit stream N-body model</li> <li>the posterior chains from the stream/potential model.</li> <li>The enclosed mass profiles for LMC and MW (figure 15 and 17 of the paper)</li> </ul>
The effect of the LMC on the Milky Way system
<p>This repository contains final snapshots of N-body simulations of the Milky Way and LMC interaction, accompanying the review paper "The effect of the LMC on the Milky Way system" (Vasiliev 2023).<br> There are two models for the Milky Way - in both cases the disk and bulge are the same, while the halo is either spherical (and slightly heavier) or triaxial with a radially changing shape; the first one is an ad hoc but quite realistic model, and the second one is taken from the "Tango" paper (Vasiliev et al. 2021, MNRAS, 501, 2279) and provides a good fit for the Sagittarius stream, but in this repository it is rerun for 5 Gyr into the past instead of 3 Gyr in the original paper.<br> The LMC is a single-component spherical truncated NFW model with mass 5e10 or 15e10 (the second variant provides a better fit for many features in the Milky Way).<br> The initial conditions for the LMC orbit are adjusted so that it arrives to the right place at the right time (i.e., its present-day position and velocity match observations to within 1 kpc and a couple km/s), but the choice of its current phase-space coordinates differs between the older Tango simulation and the more recent simplified spherical halo simulation.<br> The files "snapshot.npz" in each folder contain the present-day snapshots in Galactocentric coordinates: the Sun is located at -8.2,0,0 and the LMC sits around -0.5,-41,-27 kpc. "posvel" is the Nx6 array of positions and velocities of particles and "mass" is the array of<br> particle masses, in the units of 1 kpc, 1 km/s, 1 Msun; the time unit is close to 1 Gyr. The first 1e6 particles are the LMC, the next 1e6 particles are the stellar disk and bulge of the Milky Way, and the remaining 4e6 particles are its dark halo.<br> Other snapshots in the simulation are not provided, but instead the time-dependent potential of the entire system is represented in the format of the Agama stellar-dynamical framework (https://agama.software). The total potential is given in the non-inertial reference frame centered on the Milky Way center, and consists of three components: the Milky Way itself, the moving LMC (its trajectory in the Galactocentric coordinates is stored in trajlmc.txt), and the spatially uniform but time-dependent acceleration associated with this non-inertial frame.<br> There are two versions of the potential in each directory: "frozen" retains the initial potential of both galaxies (i.e. they are non-deforming, though of course the LMC is moving in space), and "evolving" contains potentials extracted from the actual N-body snapshots in the last 2 Gyr, represented by multipole expansions (one for the entire LMC, the other is for the Milky Way halo, while its disk+bulge are assumed to be fixed). The latter variant is more accurate and tracks the deformations of both galaxies, but is more expensive when used for orbit integrations.<br> The example Python script illustrates the usage of these potentials and reproduces one of the figures from the paper: the kinematic perturbations in the Milky Way halo at present day, which disappear when the orbits of stars are rewound back in time in the provided time-dependent potentials, starting from the current phase-space coordinates of particles.</p>
On the origin of the double [α/Fe] sequence in the Milky Way Disk
<p>Talk at Elba 23, conference in honor of Mike Rich</p>
Data for The Absolute Age of Milky Way Globular Clusters
<p>MC isochrones used to estimate the absolute age of 8 Milky Way GCs.</p> <p>Isochrone data for each GC is stored in HDF5 format and compressed. Each file comprises 10000 sets of isochrones with information such as age, mass, magnitude, etc. The stellar evolution parameters used to construct each isochrone can also be found in the file. The HDF5 file can be accessed using tools like python.</p> <p>Detailed instruction to read MC parameters and MC isochrones can be found in the notebook: Instruction on reading isochrones.ipynb</p>
Stellar Stream Models in the presence of the Milky Way and LMC
<p>These files include simulated stream models from Shipp et al. 2021 (https://ui.adsabs.harvard.edu/abs/2021arXiv210713004S/abstract).</p> <p>These streams are simulated using a modified Lagrange Cloud Stripping technique developed in Gibbons 2014, in a McMillan 2017 Milky Way potential, and with an LMC modeled as a Hernquist profile, with details described in Shipp et al. 2021. These are best-fit models resulting from fits to data from the Southern Stellar Stream Spectroscopic Survey (S5), Gaia, and the Dark Energy Survey (DES).</p> <p>The columns, as listed in the file headers, are ra and dec (deg), stream coordinates phi1 and phi2 (deg), proper motion in ra and dec (mas/yr, without reflex correction), radial velocity (km/s), Heliocentric distance (kpc), and stream positions and velocities in standard Galactocentric cartesian coordinates, x, y, z (kpc), vx, vy, vz (km/s).</p> <p>Please cite <a href="https://ui.adsabs.harvard.edu/abs/2021arXiv210713004S/abstract">Shipp et al. 2021</a> if you make use of this data.</p>
The Moon and Milky Way arch Above the Golden Hall
<p>Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.</p> <p> </p> <p>Taken in April 2021 from the top of the Laojun Mountain in China, this image shows a panoramic view of the Milky Way over the Golden Hall called “Yuhuangding” as a symbol of wealth. In China, the Milky Way is considered a huge stream like one of the big rivers. It separates the Cowherd (Altair) and his beloved Weaving Girl (Vega) and it has a Celestial Ford in the northern dark cloud in the modern constellation Cygnus.</p> <p>The Milky Way appears as a whitish arch as we cannot distinguish all the individual stars, but instead see the accumulation of light from them. It is a disc-shaped galaxy and the Solar System is located within one of its spiral arms, so we see it from inside, which gives it the shape of a band in our sky. It is associated with the religions and mythologies of several cultures. The modern term Milky Way derives from Greek folklore as the milk spread in the sky by the mother goddess Hera, when she unwillingly breastfed young Heracles. This son of Zeus and a mortal woman was put next to her while she was asleep but from his strong sucking she woke up and realised she was feeding an unknown child, and immediately pushed the child away. Greek philosophers like Plato considered the glittering band in the sky to be the traces of a former path of the Sun.</p> <p>Alternatively, for the Tupi-Guarani indigenous mythology from South America, the Milky Way represents the “path of tapir”. For some Australian native peoples, its dark clouds formed the shape of an emu if high in the sky, and of crocodiles if low on the horizon. For many southern African, South American and Australian cultures, it was considered a pathway to or from heaven. At the right edge of the image, we can recognise the modern constellation Scorpius with its most prominent star, Antares, the reddish star just above the Milky Way.</p> <p>The brightest point seen in the centre bottom of the image is the rising Moon with Jupiter next to it. A few constellations can be distinguished in this image, including Corona Australis, a faint arc-shaped constellation located to the bottom right. Just above the Southern Crown, we can see the Teapot asterism as part of the Sagittarius constellation. Since Sagittarius lies next to the centre of the Milky Way, many structures such as star-forming regions, globular clusters and planetary nebulae can be found within its boundaries. In Sagittarius, we also find a supermassive black hole four million times as massive as our Sun.</p> <p>At the left side of the band, we can identify the bright star Deneb in the constellation Cygnus, The Swan, through which the Milky Way runs, meaning that a variety of star clusters are found in this constellation.</p> <p>Credit: Likai Lin/IAU OAE (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">CC BY 4.0</a>)</p>
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