Small Magellanic Cloud XMM-Newton Point Source Catalog

Small Magellanic Cloud XMM-Newton Point Source Catalog SMCPSCXMM ivo://nasa.heasarc/smcpscxmm NASA/GSFC HEASARC Sturm et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The XMM-Newton survey of the Small Magellanic Cloud (SMC) yielded complete coverage of the bar and eastern wing in the 0.2-12.0 keV energy band. In addition to the main-field (5.58 deg2), available outer fields were included in the catalogue, yielding a total field area of 6.32 deg2. This catalog comprises 3,053 unique X-ray point sources and sources with moderate extent that have been reduced from 5,236 individual detections found in 100 observations between April 2000 and April 2010 (the details of these exposures are given in Table B.1 of the reference paper). For 927 sources, there were detections at multiple epochs, with some SMC fields observed up to 36 times. The detected sources have a median position uncertainty of 1.3 arcseconds (1 sigma) and limiting fluxes down to ~1 x 10-14 erg/s/cm2 in the 0.2-4.5 keV band, corresponding to X-ray luminosities of ~5 x 1033 erg/s for sources located in the SMC. Sources have been classified using X-ray hardness ratios, X-ray variability, and their multi-wavelength properties. In their paper, the authors discuss the statistical properties of the detected X-ray sources, like the spatial distribution, X-ray color diagrams, luminosity functions, and time variability. They have identified 49 SMC high-mass X-ray binaries (HMXB), four super-soft X-ray sources (SSS), 34 foreground stars, and 72 active galactic nuclei (AGN) behind the SMC. In addition, they found candidates for SMC HMXBs (45) and faint SSSs (8) as well as AGN (2092) and galaxy clusters (13). Notice that X-ray sources with high extent (>40 arcseconds), e.g. supernova remnants and galaxy clusters, have been previously presented by Haberl et al. (2012, A&A, 545, A128) and are not included in this table. To investigate the spectral behavior of all sources, the authors used hardness ratios HRi (i = 1, 2, 3, 4), defined by HRi = (Ri+1 - Ri)/(Ri+1 + Ri), where Ri is the count rate in energy band i as defined by: <pre> Band Energy Range 1 0.2-0.5 keV 2 0.5-1.0 keV 3 1.0-2.0 keV 4 2.0-4.5 keV 5 4.5-12. keV </pre> To increase statistics, the authors also calculated average HR_is, combining all available instruments and observations. HRi is not given if both rates Ri and Ri+1 are null or if the 1-sigma uncertainty of Delta(HRi) covers the complete HR interval from -1 to +1. To convert an individual count rate Ri of an energy band i into a setup-independent, observed flux Fi, the authors calculated energy conversion factors (ECFs) fi = Ri/Fi , as described in Sect. A.3 of the reference paper. For the calculation, they assumed a universal spectrum for all sources, described by a power-law model with a photon index of 1.7 and a photo-electric foreground absorption by the Galaxy of NH,Gal = 6 x 1020 cm-2 (average for the SMC main field in the H I map of Dickey & Lockman 1990, ARAA, 28, 215). In addition to the fluxes for each detection, the authors calculated flux upper limits FUL for each observation and source, if the source was observed but not detected in an individual observation. As for the initial source detection, they used the emldetect task to fit sources, but kept the source positions fixed at the master positions and accepted all detection likelihoods in order to get an upper limit for the flux. This table was created by the HEASARC in October 2013 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/558/A3">CDS Catalog J/A+A/558/A3</a> file smc_src.dat. This is a service provided by NASA HEASARC . 2013A&A...558A...3S https://heasarc.gsfc.nasa.gov/W3Browse/all/smcpscxmm.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=smcpscxmm& GET text/xml 180 99999 true 14.747006 -75.328178 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=smcpscxmm GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_smcpscxmm&Action=More+Options&Action=Parameter+Search&ConeAdd=1 XMM-NEWTON 0.0166666666666667 X-ray public smcpscxmm Small Magellanic Cloud XMM-Newton Point Source Catalog source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable name Source Designation (XMMU JHHMMSS.s+DDMMSS) meta.id;meta.main char nullable alt_name Identification of X-Ray Source meta.id.cross 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 Mean Error in Position arcsec stat.error;pos double nullable flux_tot Mean Flux in 0.2-12.0keV Band erg/s/cm^2 phot.flux;em.X-ray double nullable flux_tot_error Mean Error in Flux in 0.2-12.0keV Band erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable ks_prob_constant Constant Probability stat.probability;em.X-ray double nullable var_significance Significance of Variability stat.likelihood;src.var;em.X-ray 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 hr3 Hardness Ratio of Bands 3 and 4 phot.flux;arith.ratio;em.X-ray double nullable extent_error Error in Total Band Extent arcsec stat.error;phys.angSize;em.X-ray double nullable max_flux_1_to_4 Maximum 0.2-4.5keV Flux of All Observations erg/s/cm^2 phot.flux;em.X-ray;stat.max double nullable bii Galactic Latitude degree pos.galactic.lat double nullable flux_1_to_4 Mean Flux in 0.2-4.5keV Band erg/s/cm^2 phot.flux;em.X-ray double nullable min_flux_1_to_4_error Error in Minimum/Upper Limit of 0.2-4.5keV Flux erg/s/cm^2 stat.error;phot.flux;em.X-ray;stat.min double nullable flux_2 Mean Flux in 0.5-1.0keV Band erg/s/cm^2 phot.flux;em.X-ray.soft double nullable detection_likelihood Source Detection Likelihood stat.likelihood double nullable hr1 Hardness Ratio of Bands 1 and 2 phot.flux;arith.ratio;em.X-ray double nullable var_factor Variability Between Observations src.var;em.X-ray double nullable hr1_error Mean Error in HR1 stat.error;phot.flux;arith.ratio;em.X-ray double nullable flux_3_error Mean Error in Flux in 1.0-2.0keV Band erg/s/cm^2 stat.error;phot.flux;em.X-ray.soft double nullable extent Total Band Extent arcsec phys.angSize;em.X-ray double nullable extent_likelihood Likelihood of the Extent stat.likelihood;em.X-ray double nullable flux_1 Mean Flux in 0.2-0.5keV Band erg/s/cm^2 phot.flux;em.X-ray.soft double nullable max_flux_1_to_4_error Error in Maximum 0.2-4.5keV Flux of All Observations erg/s/cm^2 stat.error;phot.flux;em.X-ray;stat.max double nullable flux_4_error Mean Error in Flux in 2.0-4.5keV Band erg/s/cm^2 stat.error;phot.flux;em.X-ray.medium double nullable hr2_error Mean Error in HR2 stat.error;phot.flux;arith.ratio;em.X-ray double nullable min_flux_1_to_4 Minimum/Upper Limit of 0.2-4.5keV Flux erg/s/cm^2 phot.flux;em.X-ray;stat.min double nullable flux_5 Mean Flux in 4.5-12.0keV Band erg/s/cm^2 phot.flux;em.X-ray.medium double nullable num_observations Number of Observations meta.number;obs short nullable class Browse Object Classification src.class short nullable broad_type Classification of X-Ray Source src.class char nullable flux_3 Mean Flux in 1.0-2.0keV Band erg/s/cm^2 phot.flux;em.X-ray.soft double nullable hr4_error Mean Error in HR4 stat.error;phot.flux;arith.ratio;em.X-ray double nullable flux_2_error Mean Error in Flux in 0.5-1.0keV Band erg/s/cm^2 stat.error;phot.flux;em.X-ray.soft double nullable flux_1_error Mean Error in Flux in 0.2-0.5keV Band erg/s/cm^2 stat.error;phot.flux;em.X-ray.soft double nullable lii Galactic Longitude degree pos.galactic.lon double nullable hr2 Hardness Ratio of Bands 2 and 3 phot.flux;arith.ratio;em.X-ray double nullable hr3_error Mean Error in HR3 stat.error;phot.flux;arith.ratio;em.X-ray double nullable flux_4 Mean Flux in 2.0-4.5keV Band erg/s/cm^2 phot.flux;em.X-ray.medium double nullable flux_5_error Mean Error in Flux in 4.5-12.0keV Band erg/s/cm^2 stat.error;phot.flux;em.X-ray.medium double nullable flux_1_to_4_error Mean Error in Flux in 0.2-4.5keV Band erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable hr4 Hardness Ratio of Bands 4 and 5 phot.flux;arith.ratio;em.X-ray double nullable num_detections Number of Detections meta.number;obs short nullable