Chandra X-Ray Binary Catalog of SINGS Galaxies

Chandra X-Ray Binary Catalog of SINGS Galaxies CHANGALXRB ivo://nasa.heasarc/changalxrb NASA/GSFC HEASARC Lehmer et al. 2026-08-21 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov XRB The authors of this catalog presented new Chandra constraints on the X-ray luminosity functions (XLFs) of X-ray binary (XRB) populations, as well as their scaling relations, for a sample of 38 nearby galaxies (D = 3.4-29 Mpc). The galaxy sample is drawn primarily from the Spitzer Infrared Nearby Galaxies Survey (SINGS) and contains a wealth of Chandra (5.8 Ms total) and multiwavelength data, allowing for star formation rates (SFRs) and stellar masses (M*) to be measured on subgalactic scales. The authors divided the 2478 X-ray-detected sources into 21 subsamples in bins of specific SFR (sSFR=SFR/M*) and constructed XLFs. To model the XLF dependence on sSFR, they fitted a global XLF model, containing contributions from high-mass XRBs (HMXBs), low-mass XRBs (LMXBs), and background sources from the cosmic X-ray background that respectively scale with SFR, M*, and sky area. They found an HMXB XLF that is more complex in shape than previously reported and an LMXB XLF that likely varies with sSFR, potentially due to an age dependence. When applying the global model to XLF data for each individual galaxy, the authors discovered a few galaxy XLFs that significantly deviated from their model beyond statistical scatter. Most notably, relatively low-metallicity galaxies have an excess of HMXBs above ~1038erg/s, and elliptical galaxies that have relatively rich populations of globular clusters (GCs) show excesses of LMXBs compared to the global model. Additional modeling of how the XRB XLF depends on stellar age, metallicity, and GC specific frequency is required to sufficiently characterize the XLFs of galaxies. In this work, the authors utilized 5.8 Ms of Chandra ACIS data, combined with UV-to-IR observations, for 38 nearby (D < ~30 Mpc) Spitzer Infrared Nearby Galaxies Survey (SINGS; Kennicutt+ <a href="https://ui.adsabs.harvard.edu/abs/2003PASP..115..928K">2003PASP..115..928K</a>) galaxies to revisit scaling relations of the HMXB and LMXB X-ray luminosity functions (XLFs) with SFR and M*, respectively. This table contains the X-ray properties for 4442 X-ray point sources, including those with LX < 1035erg/s, which were excluded from the XLF analysis. This table was created by the HEASARC in April 2023 based upon the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/243/3">CDS Catalog J/ApJS/243/3</a> file table7.dat. This is a service provided by NASA HEASARC . 2019ApJS..243....3L https://heasarc.gsfc.nasa.gov/W3Browse/all/changalxrb.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=changalxrb& GET text/xml 180 99999 true 348.990795 -42.618028 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=changalxrb GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_changalxrb&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public changalxrb Chandra X-Ray Binary Catalog of SINGS Galaxies name Catalog 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 off_axis Offset of Point Source with Respect to Average Aim Point of Chandra Observations arcmin instr.offset double nullable counts Net (Background-Subtracted) 0.5-7keV Counts ct phot;em.X-ray double nullable counts_error 1-Sigma Uncertainty in Net Counts ct stat.error;phot;em.X-ray double nullable log_flux Logarithm of 0.5-8keV Source Flux log(erg/s/cm^2) phot.flux;em.X-ray double nullable log_lx Logarithm of 0.5-8keV Source Luminosity log(erg/s) phys.luminosity;em.X-ray double nullable nh_limit Limit Flag for Column Density meta.code;phys.columnDensity char nullable spectral_index_error 1-Sigma Uncertainty in Photon Index (Gamma) stat.error;spect.index double nullable spectral_index Best-Fit Photon Index, a.k.a. Gamma spect.index double nullable location_flag Flag [1-5] Indicates Location of the Source Within the Galaxy meta.code;src short nullable lii Galactic Longitude degree pos.galactic.lon double nullable bii Galactic Latitude degree pos.galactic.lat double nullable nh_error 1-Sigma Uncertainty in Column Density cm^-2 stat.error;phys.columnDensity double nullable spectral_index_limit Limit Flag for Photon Index (Gamma) meta.code;spect.index char nullable nh Best-Fit Column Density cm^-2 phys.columnDensity 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