Einstein/Clus ivo://nasa.heasarc/eingalclus NASA/GSFC HEASARC Jones, Forman 2026-04-24 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Cluster of Galaxies The Einstein Observatory Clusters of Galaxies Catalog presents the X-ray characteristics of a sample of 368 clusters of galaxies with redshifts less than 0.2 which were observed with the Einstein Imaging Proportional Counter (IPC). For each cluster, the authors measured the 0.5 - 4.5 keV counting rate and computed the 0.5 - 4.5 keV source luminosity, as well as the bolometric luminosity within fixed metric radii. They detected 85% of Abell clusters with z < 0.1, demonstrating that the large majority of these optically selected clusters are not the results of chance superpositions. For 163 clusters, they measured their X-ray surface brightness profiles and determined their core radii. For about 230 clusters, they then used either their measured core radii and beta values, or mean values derived for this sample, to measure central gas densities and gas masses. They used estimated or measured cluster gas temperatures, along with the derived gas-density profiles, to estimate total cluster masses, under the assumptions that the gas is isothermal and in hydrostatic equilibrium. This table was created by the HEASARC in June 2005 based on the merger of CDS tables J/ApJ/511/65/table3.dat and table4.dat. This is a service provided by NASA HEASARC . 1999ApJ...511...65J https://heasarc.gsfc.nasa.gov/W3Browse/all/eingalclus.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=eingalclus& GET text/xml 180 99999 true 58.11150996 -74.02408467 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=eingalclus GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_eingalclus&Action=More+Options&Action=Parameter+Search&ConeAdd=1 EINSTEIN 0.0833333333333333 X-ray public eingalclus Einstein Observatory Clusters of Galaxies Catalog 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 count_rate Count Rate (counts/s) ct/s arith.rate;phot.count;em.X-ray double nullable count_rate_error Uncertainty in Count Rate ct/s stat.error;phot.count;em.X-ray double nullable region_radius Radius of the Region Measured (Mpc) Mpc phys.size.radius float nullable total_mass_5rc Total Mass within 5 Core Radii (10^14 solar mass units) 10^14_Solar_Mass phys.mass float nullable beta_error Uncertainty in Radial Surface Brightness Parameter stat.error;stat.fit.param;phot.mag.sb float nullable tx Temperature Multiplied by the Boltzmann Constant (keV) keV phys.temperature float nullable gas_mass_5rc Gas Mass within 5 Core Radii (10^14 solar mass units) 10^14_Solar_Mass phys.mass float nullable beta Radial Surface Brightness Parameter stat.fit.param;phot.mag.sb float nullable lx_limit Limit Flag for X-Ray Luminosity meta.code;phys.luminosity;em.X-ray char nullable bii Galactic Latitude degree pos.galactic.lat double nullable bm_class Bautz-Morgan Classification src.class.struct float nullable l_bol Bolometric Luminosity (ergs/s) erg/s phys.luminosity double nullable lx_error Uncertainty in X-Ray Luminosity erg/s stat.error;phys.luminosity;em.X-ray double nullable lii Galactic Longitude degree pos.galactic.lon double nullable gas_mass_1mpc Gas Mass within 1 Mpc (10^14 solar mass units) 10^14_Solar_Mass phys.mass float nullable nh_gal Hydrogen Column Depth H-atoms/cm^2 phys.columnDensity double nullable xray_morphology Flag Indicates X-Ray Morphological Classification src.morph.type char nullable total_mass_1mpc Total Mass within 1 Mpc (10^14 solar mass units) 10^14_Solar_Mass phys.mass float nullable cluster_radius Cluster Radius Mpc phys.size.radius float nullable fit_method Method Used for Fit stat.fit char nullable richness Flag Indicates Richness of the Cluster src.class.richness short nullable gas_density Gas Density (10^-3 cm^-3) 10^-3_cm^-3 phys.density double nullable lx X-Ray (0.5-4.5keV) Luminosity (ergs/s) erg/s phys.luminosity;em.X-ray double nullable rad_cooling_time Radiative Cooling Timescale (10^10 years) 10^10_yr time.scale float nullable number_galaxies Number of Galaxies in the Cluster meta.number short nullable position_flag Flag Indicates Less Accurate Coordinates meta.code.qual;pos char nullable ref_redshift Reference Code for Redshift meta.bib;src.redshift char nullable cluster_radius_error Uncertainty in Cluster Radius Mpc stat.error;phys.size.radius float 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