CHAMPLANEX ivo://nasa.heasarc/champlanex NASA/GSFC HEASARC Hong et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the Chandra Multiwavelength Plane (ChaMPlane) Survey catalog of X-ray point sources in the window and four Galactic bulge fields, specifically all source detections with net counts >= 1 in the 0.3-8 keV broad band. In the reference paper, the authors present the log N-log S and spatial distributions of X-ray point sources in seven Galactic bulge (GB) fields within 4 degrees of the Galactic center (GC). They compare the properties of 1159 X-ray point sources discovered in their deep (100 ks) Chandra observations of three low extinction Window fields near the GC with the X-ray sources in the other GB fields centered around Sgr B2, Sgr C, the Arches Cluster, and Sgr A* using Chandra archival data. To reduce the systematic errors induced by the uncertain X-ray spectra of the sources coupled with field-and-distance-dependent extinction, they classify the X-ray sources using quantile analysis and estimate their fluxes accordingly. The result indicates that the GB X-ray population is highly concentrated at the center, more heavily than the stellar distribution models. It extends out to more than 1.4 degrees from the GC, and the projected density follows an empirical radial relation inversely proportional to the offset from the GC. They also compare the total X-ray and infrared surface brightness using the Chandra and Spitzer observations of the regions. The radial distribution of the total infrared surface brightness from the 3.6-micron band images appears to resemble the radial distribution of the X-ray point sources better than that predicted by the stellar distribution models. Assuming a simple power-law model for the X-ray spectra, the closer to the GC, the intrinsically harder the X-ray spectra appear, but adding an iron emission line at 6.7 keV in the model allows the spectra of the GB X-ray sources to be largely consistent across the region. This implies that the majority of these GB X-ray sources can be of the same or similar type. Their X-ray luminosity and spectral properties support the idea that the most likely candidate is magnetic cataclysmic variables (CVs), primarily intermediate polars (IPs). Their observed number density is also consistent with the majority being IPs, provided the relative CV to star density in the GB is not smaller than the value in the local solar neighborhood. This table was created by the HEASARC in January 2010, based on the electronic version of Table 2 from the reference paper, which was obtained from the Astrophysical Journal web site. This is a service provided by NASA HEASARC . 2009ApJ...706..223H https://heasarc.gsfc.nasa.gov/W3Browse/all/champlanex.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=champlanex& GET text/xml 180 99999 true 270.757383 -30.132177 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=champlanex GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_champlanex&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public champlanex ChaMPlane Galactic Bulge and Center X-Ray Source Catalog name 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 error_radius 95% Confidence Positional Error (arcsec) arcsec stat.error;pos double nullable off_axis Offset from the Aimpoint (arcmin) arcmin instr.offset double nullable fb_counts Net Counts in the 0.3-8.0 keV Band ct phot;em.X-ray double nullable fb_counts_error Statistical Error in the Net Counts in the 0.3-8.0 keV Band ct stat.error;phot;em.X-ray double nullable hb_flux Unabsorbed Flux in the 2.0-8.0 keV Band erg/s/cm^2 phot.flux;em.X-ray.medium double nullable hb_flux_error Error in the Unabsorbed Flux in the 2.0-8.0 keV Band erg/s/cm^2 stat.error;phot.flux;em.X-ray.medium double nullable field_name_code Field Designation meta.id;obs.field char nullable sb_counts Net Counts in the 0.5-2.0 keV Band ct phot;em.X-ray.soft double nullable quantile_y_val_pos_err Positive Error for the y-value of the Quantile Diagram stat.error;stat.param double nullable bii Galactic Latitude degree pos.galactic.lat double nullable hb_snr Signal-to-Noise in the 2.0-8.0 keV Band stat.snr;em.X-ray.medium double nullable hb_counts_error Statistical error in the Net Counts in the 2.0-8.0 keV Band ct stat.error;phot;em.X-ray.medium double nullable hb_counts Net Counts in the 2.0-8.0 keV Band ct phot;em.X-ray.medium double nullable lii Galactic Longitude degree pos.galactic.lon double nullable median_energy Median Energy (keV) keV phys.energy double nullable quantile_y_val_neg_err Negative Error for the y-value of the Quantile Diagram stat.error;stat.param double nullable sb_counts_error Statistical Error in the Net Counts in the 0.5-2.0 keV Band ct stat.error;phot;em.X-ray.soft double nullable quantile_group Group Identification meta.code short nullable quantile_y_val y-value of the Quantile Diagram stat.param double nullable median_energy_error Error in Median Energy keV stat.error;phys.energy 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