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204 results for “Chandra”
Chandra HRC-I Jupiter X-ray data set
<p>Data set to supplement code scripts contained in the repository: https://github.com/SeanMcEntee/cxo_goes_disk_study</p> <p> </p>
THE NATURE OF X-RAYS FROM YOUNG STELLAR OBJECTS IN THE ORION NEBULA CLUSTER - A Chandra HETGS Legacy Project
<p><span>This first release provides the community with a first cut of confusion cleaned X-ray spectra of the Orion Nebula Cluster observed with the HETG onboard the Chandra X-ray Observatory. The data were taken starting in 1999 until 2021. <br><br>The confusion cleaning is based on several aspects of sources for confusion, which includes cluster point sources intersecting with grating dispersions, grating arms intersecting each other in CCD space, as well as grating dispersion overlaps prohibiting proper order sorting. The latter is a major effect and resulted in sometimes severe data losses. In the first release, our automated procedure took care of the vast majority of point sources and grating arm intersections. With respect to the dispersion arm overlaps, in this release we took a statistical approach optimizing the agreement of all four grating dispersion arms in the merged data to agree within a 1 sigma statistical uncertainty over 90% of the bandpass between 2 and 15 Angstrom. For that we used the zero order flux fractions of the interfering sources as the driving parameter. <br><br>There are still many caveats and rooms for improvement, which we will address in upcoming releases, which include the treatment of the increasing background at high dispersion, improve extraction efficiency, exclude observations with non-detections before confusion cleaning, include possible new detections, investigate the 5 A excess we observe in the HEG, though at low statistics, spotcheck individual observations for any residual issues. <br><br>Release 1 provides the community with an excellent starting point for addressing our identified science projects. Out of the 46 sources that were extracted, 37 resulted in valid spectral data. 7 sources have less than 1000 counts in 1st order, some of those may not yet be very useful. <br></span></p> <p> </p> <p>Each directory contains the merged cleaned spectrum and responses for<br>one source. The file "pha2" is a Type II PHA file (multiple spectra)<br>containing the four first order spectra, HEG -1, HEG +1, MEG -1, and<br>MEG +1. Headers have been edited indicate the object (OBJECT), and<br>start and stop times for the set of observations. Since the exposure<br>depends on order, due to the cleaning process, EXPOSURE is a column in<br>the data table. Some other keywords now say "MERGED" since they can<br>vary with observation.</p> <p>There is one effective area file per order (".arf" files). These have<br>also been merged by zeroing out the same regions as excluded in the<br>count spectra, and summed weighting by exposure. They also have<br>similar header edits as for the spectra.</p> <p>While the exposures in headers may say 2 Ms, the actual exposure at<br>any wavelength may be much less. This is not explicitly known, but is<br>implicit in the ignored wavelength regions in the merged counts and<br>responses.</p> <p>There is one grating response matrix (".rmf" files) per order. Since<br>all spectral extractions of all sources used the same cross-dispersion<br>region, there is no change in these files between sources. One set<br>suffices for all extractions. These are in the directory "RMFs", and<br>also for convenience have symbolic links in each source directory.</p> <p>HETG background files have also been provided, one PHA file per first<br>order, in directory HETG_Background. These have been derived from<br>long observations of blank fields. Details are provided in the<br>accompanying memo, hetg_background.pdf.</p> <p>Headers have not been designed for auto-loading of responses (that is<br>CORRFILE, RESPFILE, and BACKFILE are set to 'none').</p>
Optical spectroscopy supporting Chandra observations of Herbig AeBe stars
<p>This is optical data taken by AAVSO observers to support Chandra observations of Herbig AeBe stars. The purpose if this data is to check the accretion rate close in time to the Chandra observations.</p>
Modeled Ice thickness Distribution of Glaciers in Chandra Basin, Western Himalayas, India
<p>The glacier ice thickness distribution data provided here was generated using an optimally parameterized GlabTop2_IITB [Glacier Bed Topography Indian Institute of Technology Bombay (IITB) version] model with high-resolution DEM as an input. This research work is under publication in the Journal of Mountain Science. The study reports modeled ice thickness distribution and total ice volume of selected 65 glaciers (>0.5 km<sup>2</sup>) of Chandra basin, located in Western Himalayas. </p> <p> </p>
Potential Sites for Future Lake Formation in Glaciers of Chandra Basin, Western Himalayas, India
<p>The disappearance of mountain glaciers and the formation or expansion of glacial lakes are amongst the most distinguishable and dynamic impacts of climate warming in the Himalayas. The given dataset provides the potential sites for future lake formation over 65 study glaciers in the Chandra basin of the western Himalayas.</p>
Renuka Wetlands (Photo: Chandra et al., 2021) in Faunal Composition of Ramsar Wetlands from India: An Analysis
Renuka Wetlands (Photo: Chandra et al., 2021)
Greylag Geese (Photo: Chandra et al., 2021) in Faunal Composition of Ramsar Wetlands from India: An Analysis
Greylag Geese (Photo: Chandra et al., 2021)
Irrawady Dolphin at Chilika Lake (Photo: Chandra et al., 2021). in Faunal Composition of Ramsar Wetlands from India: An Analysis
Irrawady Dolphin at Chilika Lake (Photo: Chandra et al., 2021).
Glacier_inventory_debris_cover_ice_thickness_dataset_Chandra_Bhaga_basin_Himalaya
<p>This is a multitemporal glacier dataset over ChandraBhaga basin in western Himalaya which includes glacier inventory (for 251 glaciers with area > 0.5 km<sup>2</sup>) for year 1993, 2000, 2010 and 2019 (.shp files); debris cover for year 1993 and 2019 (.tif files) and ice thickness (.tif files). Details of files are included in data_description.docx. These datasets form part of manuscript submitted to Earth Systems and Science Data.</p>
Lightcurves, Colour-Colour Ratio and CuSum plots for HD 179949 Chandra Observations - Acharya et al. (2022)
<p>Plots made for the paper "X-ray Activity on SPI Candidate HD 179949" Anshuman Acharya et al. (2022). This includes:<br> 1. All Light curves for the 7 passbands considered (4 physically motivated + 3 default Chandra passbands) + Broad band (0.5 - 7.0 keV) for the 5 datasets. The filename format is: "dataset ObsID"_"passband name"_lightcurve.pdf.<br> 2. Colour-colour ratios for the passbands (9 combinations) for the 5 datasets. The filename format is: "dataset ObsID"+ColourRatio_"soft passband name"+"hard passband name".pdf.<br> 3. Cumulative Sum of residuals plot for Model 1 (referred to as model 2m in the paper: chosen model for 6121, not chosen for 5427 and 6119) and Model 2 (referred to as model 2v in the paper: chosen model for 5427, 6119, 6121 and 6122). Note that Model 1 plots for ObsIDs 6120 and 6122 are not made as <span class="math-tex">\(\Delta\)</span>Cstat > 2 <span class="math-tex">\(\sigma\)</span> for them. The filename format is: Model1/Model2_"dataset ObsID"_residuals_for_CuSum.pdf.<br> 4. p-value calculated for the Cumulative Sums for all the above cases. The filename format is: Model1/Model2_"dataset ObsID"_p-value_for_CuSum.pdf.</p> <p>Dataset ObsIDs are: 5427, 6119, 6120, 6121 and 6122.<br> Passbands used:<br> Physically motivated: Oxy (0.5-0.7 keV), Fe (0.7-0.9 keV), Ne (0.9-1.2 keV), Mg (1.2-3.0 keV).<br> Default Chandra passbands: ultrasoft (0.2-0.5 keV), soft (0.5-1.2 keV), medium + hard (1.2-8.0 keV), broad (0.5-7.0 keV).</p>
Chandra Sgr A* light curves from 2012 to 2018
<p>300s binned 2-8 keV Chandra light curves of Sgr A*. The event lists needed to produce these plots are obtained by reducing the raw data using standard CIAO tools. The extraction region is a small radius 1.25" circular region centered around the radio position of the Sgr A*. For gratings observations (from the X-ray Visionary Program (XVP)), we use 0th and +/- 1st order counts, with grating order tolerance of +/- 0.2. The first order counts are extracted from a rectangular box with a 5 pixel (2.5") width also centered on the source.</p> <p>The red horizontal lines are Bayesian Blocks calibrated on signal-free Poisson light curves with a false alarm probability, p<sub>0</sub>, of 5%. Their error bars are Poisson errors. Identified flares are isolated by blue vertical lines.</p>
Chandra E0102 Filament Jolideco Example Dataset
<p>This is an example dataset of a filament region in the supernova remnant E0102 from the Chandra observatory. It includes the counts image, an image of the PSF and exposure for each of the observations. The dataset was produced using the following workflow: https://github.com/jolideco/jolideco-chandra-e0102-zoom-a. The filename includes the correspoding observation id.</p>
Yoga Asana Chandra Harmoni on Psychological Well-being and Learning Readiness Among Medical Students
ClinicalTrials.gov study NCT07171268. IPD Sharing: NO. Countries: 1. Publications: 1.
Chandra HETG Spectrum of Quiescent Emission from Sgr A*
<p>Dataset from "The Chandra High Resolution X-ray Spectrum of Quiescent Emission from Sgr A*", by Corrales et al. (2020).</p> <p>This article has been accepted to the Astrophysical Journal. A copy of the article pre-print is also uploaded for reference, and is also available on the astro-ph arXiv: <a href="https://arxiv.org/abs/2002.07198">https://arxiv.org/abs/2002.07198</a></p> <p>The dataset is available through the Chandra contributed datasets website: <a href="http://cxc.cfa.harvard.edu/cda/Contrib/2020/CORR1/">http://cxc.cfa.harvard.edu/cda/Contrib/2020/CORR1/</a></p> <p>Zenodo is being used for backup legacy storage, as there is no guarantee that the Chandra website will be maintained beyond the mission end date.</p>
Figures 13-18 from: Singh N, Kirti JS, Ranjan R, Chandra K, Speidel W (2020) On the taxonomy of the genus Sacada Walker, 1862 from India, with descriptions of a new genus and two new species (Pyralinae, Pyralidae, Lepidoptera). ZooKeys 962: 139-163. https://doi.org/10.3897/zookeys.962.51194
Figures 13-18 Adults of Sacada and Pseudosacada spp. 13S. pallescens Hampson (male), lectotype, Bhutan 14S. decora Walker, Singapore 15Pseudosacada flexuosa (Snellen) (= Sybrida inflammealis Ragonot), India 16P. flexuosa (Snellen) (male), Kanhmun, Mizoram, India 17P. flexuosa (Snellen) (male), Umtasor, Meghalaya, India 18P. flexuosa (Snellen) (male), Ganeshgudi, Karnataka, India. Scale bars: 5 mm (16–18).
Figures 7-12 from: Singh N, Kirti JS, Ranjan R, Chandra K, Speidel W (2020) On the taxonomy of the genus Sacada Walker, 1862 from India, with descriptions of a new genus and two new species (Pyralinae, Pyralidae, Lepidoptera). ZooKeys 962: 139-163. https://doi.org/10.3897/zookeys.962.51194
Figures 7-12 Adults of Sacada spp. 7S. unilinealis Hampson (male), India 8S. unilinealis Hampson (male), holotype, Sikkim, India 9S. inordinata (Walker) (male), holotype, Darjeeling, India 10S. dzonguensis, sp. nov. (male), India. 11S. umtasorensis, sp. nov. (male), India 12S. pallescens Hampson (male), India. Scale bars: 5 mm (7, 10, 11); 12.7 mm (12).
Figures 33-40 from: Singh N, Kirti JS, Ranjan R, Chandra K, Speidel W (2020) On the taxonomy of the genus Sacada Walker, 1862 from India, with descriptions of a new genus and two new species (Pyralinae, Pyralidae, Lepidoptera). ZooKeys 962: 139-163. https://doi.org/10.3897/zookeys.962.51194
Figures 33-40 Male genitalia of Pseudosacada flexuosa (Snellen). 33 Ventral view 34 dorsal view 35 aedeagus 36 valva 37 uncus 38 gnathos 39 lateral process of uncus 40 enlarged view of transtilla processes.
Figures 1-6 from: Singh N, Kirti JS, Ranjan R, Chandra K, Speidel W (2020) On the taxonomy of the genus Sacada Walker, 1862 from India, with descriptions of a new genus and two new species (Pyralinae, Pyralidae, Lepidoptera). ZooKeys 962: 139-163. https://doi.org/10.3897/zookeys.962.51194
Figures 1-6 Adults of Sacada spp. 1S. sikkima (Moore) (male), India 2S. sikkima (Moore) (male), lectotype, Darjeeling, India 3S. constrictalis (Ragonot) (male), India 4, 5S. discinota (Moore) (male), India 6S. discinota (Moore) (male), lectotype, Darjeeling, India. Scale bars: 5 mm (1); 12.7 mm (3–5).
Figures 19-26 from: Singh N, Kirti JS, Ranjan R, Chandra K, Speidel W (2020) On the taxonomy of the genus Sacada Walker, 1862 from India, with descriptions of a new genus and two new species (Pyralinae, Pyralidae, Lepidoptera). ZooKeys 962: 139-163. https://doi.org/10.3897/zookeys.962.51194
Figures 19-26 Male genitalia of Sacada spp. 19, 20 Male genitalia of S. sikkima (Moore) 21, 22 male genitalia of S. constrictalis (Ragonot) 23, 24 male genitalia of S. discinota (Moore) 25, 26 male genitalia of S. unilinealis Hampson.
Figures 27-32 from: Singh N, Kirti JS, Ranjan R, Chandra K, Speidel W (2020) On the taxonomy of the genus Sacada Walker, 1862 from India, with descriptions of a new genus and two new species (Pyralinae, Pyralidae, Lepidoptera). ZooKeys 962: 139-163. https://doi.org/10.3897/zookeys.962.51194
Figures 27-32 Male genitalia of Sacada spp. 27, 28 Male genitalia of S. dzonguensis, sp. nov. 29, 30 male genitalia of S. umtasorensis, sp. nov. 31, 32 male genitalia of S. pallescens Hampson.
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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