Archive of Chandra Cluster Entropy Profile Tables (ACCEPT) Catalog

Archive of Chandra Cluster Entropy Profile Tables (ACCEPT) Catalog ACCEPTCAT ivo://nasa.heasarc/acceptcat NASA/GSFC HEASARC Cavagnolo et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table, the Archive of Chandra Cluster Entropy Profile Tables (ACCEPT) Catalog, contains the radial entropy profiles of the intracluster medium (ICM) for a collection of 239 clusters taken from the Chandra X-ray Observatory's Data Archive. Entropy is of great interest because it controls ICM global properties and records the thermal history of a cluster. The authors find that most ICM entropy profiles are well fitted by a model which is a power law at large radii and approaches a constant value at small radii: K(r) = K0 + K100 (r/100 kpc)alpha, where K0 quantifies the typical excess of core entropy above the best-fitting power law found at larger radii. The authors also show that the K0 distributions of both the full archival sample and the primary Highest X-Ray Flux Galaxy Cluster Sample of Reiprich (2001, Ph.D. thesis) are bimodal with a distinct gap between K0 ~ 30 - 50 keV cm2 and population peaks at K0 ~ 15 keV cm2 and K0 ~ 150 keV cm2. The effects of point-spread function smearing and angular resolution on best-fit K0 values are investigated using mock Chandra observations and degraded entropy profiles, respectively. The authors find that neither of these effects is sufficient to explain the entropy-profile flattening they measure at small radii. The influence of profile curvature and the number of radial bins on the best-fit K0 is also considered, and they find no indication that K0 is significantly impacted by either. All data and results associated with this work are publicly available via the project web site <a href="http://www.pa.msu.edu/astro/MC2/accept/">http://www.pa.msu.edu/astro/MC2/accept/</a>. The sample is collected from observations taken with the Chandra X-ray Observatory and which were publicly available in the CDA (Chandra Data Archive) as of 2008 August. This table was created by the HEASARC in January 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/182/12">CDS Catalog J/ApJS/182/12</a> files table1.dat and table5.dat. This is a service provided by NASA HEASARC . 2009ApJS..182...12C https://heasarc.gsfc.nasa.gov/W3Browse/all/acceptcat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=acceptcat& GET text/xml 180 99999 true 234.88535417 -83.58995278 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=acceptcat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_acceptcat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0833333333333333 X-ray public acceptcat Archive of Chandra Cluster Entropy Profile Tables (ACCEPT) Catal name Cluster Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable redshift Redshift src.redshift double nullable kt Average Cluster Temperature keV phys.temperature double nullable fit_method_1 Method of T_X Interpolation in Inner Region: flat or extr (Linear Extrapolation) meta.note;stat.fit char nullable num_radial_bins Number of Radial Bins in Fit meta.number;stat.fit short nullable alpha_1 Best-Fit Power-Law Index stat.fit.param double nullable alpha_1_error Uncertainty in Best-Fit Power-Law Index stat.error;stat.fit.param double nullable dof_1 Degrees of Freedom in Fit stat.fit.dof short nullable chi_squared_1 Chi-Squared of Best-Fit Model stat.fit.chi2 double nullable p_value_3 Probability of Worse Fit Given Chi-Squared and DOF stat.probability;stat.fit char nullable p_value_2 Probability of Worse Fit Given Chi-Squared and DOF stat.probability;stat.fit char nullable obsid_3 Chandra Observation Identifier 3 meta.id;obs int nullable dof_3 Degrees of Freedom in Fit stat.fit.dof short nullable fit_method_3 Method of T_X Interpolation in Inner Region: flat or extr (Linear Extrapolation) meta.note;stat.fit char nullable obsid_5 Chandra Observation Identifier 5 meta.id;obs int nullable fit_method_2 Method of T_X Interpolation in Inner Region: flat or extr (Linear Extrapolation) meta.note;stat.fit char nullable chi_squared_3 Chi-Squared of Best-Fit Model stat.fit.chi2 double nullable bf_100k_entropy_1_error Uncertainty in Best-Fit Entropy at 100 kpc keV.cm^2 stat.error;phys.entropy;stat.fit.param double nullable obsid_4 Chandra Observation Identifier 4 meta.id;obs int nullable alpha_2_error Uncertainty in Best-Fit Power-Law Index stat.error;stat.fit.param double nullable bf_100k_entropy_4 Best-Fit Entropy at 100 kpc keV.cm^2 phys.entropy;stat.fit.param double nullable center_ccd_obsid_7 CCD Location of Cluster Center in Chandra Observation 7 meta.id;instr.det char nullable fit_method_4 Method of T_X Interpolation in Inner Region: flat or extr (Linear Extrapolation) meta.note;stat.fit char nullable chi_squared_2 Chi-Squared of Best-Fit Model stat.fit.chi2 double nullable bf_core_entropy_3 Best-Fit Core Entropy, K_0 keV.cm^2 phys.entropy;stat.fit.param double nullable chi_squared_4 Chi-Squared of Best-Fit Model stat.fit.chi2 double nullable num_sigma_k0_gt_0_4 Number of Sigma Best-Fit Core Entropy Is Away from Zero stat.fit.goodness double nullable notes Assigned Note(s) meta.note char nullable exposure_obsid_5 Exposure Time for Chandra Observation 5 s time.duration;obs.exposure double nullable obsid_7 Chandra Observation Identifier 7 meta.id;obs int nullable bf_core_entropy_1 Best-Fit Core Entropy, K_0 keV.cm^2 phys.entropy;stat.fit.param double nullable alpha_4_error Uncertainty in Best-Fit Power-Law Index stat.error;stat.fit.param double nullable center_ccd_obsid_1 CCD Location of Cluster Center in Chandra Observation 1 meta.id;instr.det char nullable obsid_1 Chandra Observation Identifier 1 meta.id;obs int nullable bf_core_entropy_4_error Uncertainty in Best-Fit Core Entropy, K_0 keV.cm^2 stat.error;phys.entropy;stat.fit.param double nullable num_sigma_k0_gt_0_3 Number of Sigma Best-Fit Core Entropy Is Away from Zero stat.fit.goodness double nullable bf_100k_entropy_3 Best-Fit Entropy at 100 kpc keV.cm^2 phys.entropy;stat.fit.param double nullable exposure_obsid_6 Exposure Time for Chandra Observation 6 s time.duration;obs.exposure double nullable alpha_4 Best-Fit Power-Law Index stat.fit.param double nullable bf_100k_entropy_2_error Uncertainty in Best-Fit Entropy at 100 kpc keV.cm^2 stat.error;phys.entropy;stat.fit.param double nullable center_ccd_obsid_4 CCD Location of Cluster Center in Chandra Observation 4 meta.id;instr.det char nullable bf_100k_entropy_4_error Uncertainty in Best-Fit Entropy at 100 kpc keV.cm^2 stat.error;phys.entropy;stat.fit.param double nullable lii Galactic Longitude degree pos.galactic.lon double nullable obsid_2 Chandra Observation Identifier 2 meta.id;obs int nullable center_ccd_obsid_6 CCD Location of Cluster Center in Chandra Observation 6 meta.id;instr.det char nullable obsid_6 Chandra Observation Identifier 6 meta.id;obs int nullable bf_100k_entropy_1 Best-Fit Entropy at 100 kpc keV.cm^2 phys.entropy;stat.fit.param double nullable p_value_4 Probability of Worse Fit Given Chi-Squared and DOF stat.probability;stat.fit char nullable bf_core_entropy_1_error Uncertainty in Best-Fit Core Entropy, K_0 keV.cm^2 stat.error;phys.entropy;stat.fit.param double nullable center_ccd_obsid_2 CCD Location of Cluster Center in Chandra Observation 2 meta.id;instr.det char nullable bf_core_entropy_4 Best-Fit Core Entropy, K_0 keV.cm^2 phys.entropy;stat.fit.param double nullable alpha_3_error Uncertainty in Best-Fit Power-Law Index stat.error;stat.fit.param double nullable alpha_3 Best-Fit Power-Law Index stat.fit.param double nullable bii Galactic Latitude degree pos.galactic.lat double nullable num_sigma_k0_gt_0_2 Number of Sigma Best-Fit Core Entropy Is Away from Zero stat.fit.goodness double nullable max_fit_radius Maximum Radius for Fit Mpc phys.size;stat.fit double nullable bf_100k_entropy_3_error Uncertainty in Best-Fit Entropy at 100 kpc keV.cm^2 stat.error;phys.entropy;stat.fit.param double nullable exposure_obsid_1 Exposure Time for Chandra Observation 1 s time.duration;obs.exposure double nullable exposure_obsid_7 Exposure Time for Chandra Observation 7 s time.duration;obs.exposure double nullable num_sigma_k0_gt_0_1 Number of Sigma Best-Fit Core Entropy Is Away from Zero stat.fit.goodness double nullable dof_4 Degrees of Freedom in Fit stat.fit.dof short nullable bf_core_entropy_3_error Uncertainty in Best-Fit Core Entropy, K_0 keV.cm^2 stat.error;phys.entropy;stat.fit.param double nullable bf_core_entropy_2_error Uncertainty in Best-Fit Core Entropy, K_0 keV.cm^2 stat.error;phys.entropy;stat.fit.param double nullable exposure_obsid_4 Exposure Time for Chandra Observation 4 s time.duration;obs.exposure double nullable bf_100k_entropy_2 Best-Fit Entropy at 100 kpc keV.cm^2 phys.entropy;stat.fit.param double nullable center_ccd_obsid_3 CCD Location of Cluster Center in Chandra Observation 3 meta.id;instr.det char nullable dof_2 Degrees of Freedom in Fit stat.fit.dof short nullable exposure_obsid_3 Exposure Time for Chandra Observation 3 s time.duration;obs.exposure double nullable alpha_2 Best-Fit Power-Law Index stat.fit.param double nullable center_ccd_obsid_5 CCD Location of Cluster Center in Chandra Observation 5 meta.id;instr.det char nullable exposure_obsid_2 Exposure Time for Chandra Observation 2 s time.duration;obs.exposure double nullable bf_core_entropy_2 Best-Fit Core Entropy, K_0 keV.cm^2 phys.entropy;stat.fit.param double nullable p_value_1 Probability of Worse Fit Given Chi-Squared and DOF stat.probability;stat.fit char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable