NGC4472CXO ivo://nasa.heasarc/ngc4472cxo NASA/GSFC HEASARC Maccarone et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Chandra X-Ray Point Source Catalog of the giant elliptical galaxy NGC 4472 contains the results of a Chandra ACIS-S/Hubble Space Telescope (HST) study of the point sources of this Virgo Cluster galaxy. The authors ran WAVDETECT from the CIAO 2.2 software package using wavelet scales from 1 to 16 pixels spaced by factors of 2, setting a false-source probability detection threshold of 10<sup>-6</sup>, which should yield an expectation value of slightly less than one false source over the entire ACIS-S chip. They identify 144 X-ray point sources outside the nuclear region, 72 of which are located within the HST fields. An additional 3 sources are within 8" of the center of the galaxy and appear to be associated either with a weak active galactic nucleus or with brightness enhancements in the hot interstellar gas. One additional source (not included in this table) appears to be a spurious detection, as WAVDETECT assigns it a count rate of 1.5 counts, and visual inspection fails to find evidence of a source at that location. The optical data show 1102 sources whose half-light radii are small enough to be globular cluster candidates, 829 of which also have colors consistent with being globular clusters (with only four in the restricted central 10" region). 30 X-ray sources within 0.7" of an optical source with optical colors consistent with being globular clusters were found. Two additional sources show optical colors outside the globular cluster color range and are likely to be either foreground or background objects. The thirty globular cluster matches are likely to be low-mass X-ray binaries (LMXBs) associated with the globular clusters, while ~ 42 of the X-ray sources have no optical counterparts to V <~ 25 and I <~ 24, indicating that they are likely to be predominantly LMXBs in the field star population with a small amount of possible contamination from background active galactic nuclei. Thus approximately 40% of the X-ray sources are in globular clusters and ~ 4% of the globular clusters contain X-ray sources. This HEASARC table contains the X-ray data for the above-mentioned 147 detected X-ray sources, and the correlative optical data for the 30 optical counterparts which have colors consistent with being globular clusters. It does not contain the data from the full list of optical sources which were given in Table 2 of the reference paper. This table was created by the HEASARC in May 2007 based on CDS table J/ApJ/586/814 files table1.dat and table3.dat. This is a service provided by NASA HEASARC . 2003ApJ...586..814M https://heasarc.gsfc.nasa.gov/W3Browse/all/ngc4472cxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ngc4472cxo& GET text/xml 180 99999 true 187.46458333 7.95138889 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ngc4472cxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ngc4472cxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 Optical X-ray public ngc4472cxo NGC 4472 Chandra X-Ray Point Source Catalog name CXOMKZ Source 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 sb_flux The (0.5-2.0keV) X-ray Model Flux erg/s/cm^2 phot.flux;em.X-ray.soft double nullable hb_flux The (2.0-8.0keV) X-ray Model Flux erg/s/cm^2 phot.flux;em.X-ray.medium double nullable lx The 0.5-8.0keV X-Ray Luminosity erg/s phys.luminosity;em.X-ray double nullable optical_name Optical Source Designation meta.id.cross char nullable vmag V Magnitude mag phot.mag;em.opt.V double nullable chi_squared Chi^2 of the Model Fit stat.fit.chi2 double nullable spectral_index_neg_err 90% Error in Negative Direction stat.error;spect.index;em.X-ray double nullable lii Galactic Longitude degree pos.galactic.lon double nullable vi_color_error RMS Uncertainty on V-I Color Index mag double nullable spectral_index_flag Flag Indicates Note on Gamma meta.code char nullable alt_name Alternative Source Designation meta.id char nullable hst_region_flag HST Region Flag meta.code char nullable vmag_error RMS Uncertainty on V Magnitude mag stat.error;phot.mag;em.opt.V double nullable vi_color V-I Color Index mag phot.color;em.opt.V;em.opt.I double nullable imag I Magnitude mag phot.mag;em.opt.I double nullable imag_error RMS Uncertainty on I Magnitude mag stat.error;phot.mag;em.opt.I double nullable half_light_radius Half-Light Radius of Optical Counterpart arcsec phys.angSize;src double nullable good_region_flag Good Region Flag meta.code char nullable bii Galactic latitude degree pos.galactic.lat double nullable ra_optical_j2000 Right Ascension of Optical Counterpart (J2000) meta.id.cross;pos.eq.ra char nullable optical_source_number Optical Catalog Number meta.id.cross short nullable source_number X-ray Catalog Number meta.id short nullable dof Degrees of Freedom of the Model Fit stat.fit.dof short nullable spectral_index_pos_err 90% Error in Positive Direction stat.error;spect.index;em.X-ray double nullable spectral_index Spectral Index in Photon Space spect.index;em.X-ray double nullable dec_optical_j2000 Declination of Optical Counterpart (J2000) meta.id.cross;pos.eq.dec char nullable half_light_radius_error RMS Uncertainty on Half-Light Radius of Optical Counterpart arcsec stat.error;phys.angSize;src double 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