M 33 XMM-Newton Supernova Remnants Catalog M33SNRXMM ivo://nasa.heasarc/m33snrxmm NASA/GSFC HEASARC Garofali et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The authors of this catalog carried out a study of the X-ray properties of the supernova remnant (SNR) population in M 33 with XMM-Newton, comprising deep observations of eight fields in M 33 covering all of the area within the D&lt;sub&gt;25&lt;/sub&gt; contours, and with a typical luminosity of 7.1 x 10&lt;sup&gt;34&lt;/sup&gt; erg/s (0.2-2.0keV). With their deep observations and large field of view they have detected 105 SNRs at the 3-sigma level, of which 54 SNRs are newly detected in X-rays, and three are newly discovered SNRs. Combining XMM-Newton data with deep Chandra survey data allowed detailed spectral fitting of 15 SNRs, for which they have measured temperatures, ionization time-scales and individual abundances. This large sample of SNRs allowed the authors to construct an X-ray luminosity function, and compare its shape to luminosity functions from host galaxies of differing metallicities and star formation rates to look for environmental effects on SNR properties. They concluded that while metallicity may play a role in SNR population characteristics, differing star formation histories on short time-scales, and small-scale environmental effects appear to cause more significant differences between X-ray luminosity distributions. In addition, they analyze the X-ray detectability of SNRs, and find that in M 33 SNRs with higher [SII]/H-alpha ratios, as well as those with smaller galactocentric distances, are more detectable in X-rays. This catalog utilized data from a deep survey of M 33 using an 8 field XMM-Newton mosaic that extends out to the D25 isophote. The point source catalog from this survey was published by W15 (Williams+2015, J/ApJS/218/9). In addition to the catalog of W15, the authors utilized high-resolution observations from the Chandra ACIS Survey of M 33 (ChASeM33, Tullmann+2011, J/ApJS/193/31) for the purposes of obtaining X-ray spectral fits. This table was ingested by the HEASARC in October 2019 based upon the &lt;a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/MNRAS/472/308"&gt;CDS Catalog J/MNRAS/472/308&lt;/a&gt; files table2.dat and table3.dat. This is a service provided by NASA HEASARC . 2017MNRAS.472..308G https://heasarc.gsfc.nasa.gov/W3Browse/all/m33snrxmm.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=m33snrxmm& GET text/xml 180 99999 true 23.41891667 30.18009722 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=m33snrxmm GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_m33snrxmm&Action=More+Options&Action=Parameter+Search&ConeAdd=1 XMM-NEWTON 0.0166666666666667 X-ray public m33snrxmm M 33 XMM-Newton Supernova Remnants 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 hr1 Hardness Ratio in the 0.3-0.7, 0.7-1.1 and 1.1-4.2 keV Bands: HR1=(M-S)/(H+M+S) phot.flux;arith.ratio;em.X-ray double nullable hr2 Hardness Ratio in the 0.3-0.7, 0.7-1.1 and 1.1-4.2keV Bands: HR2=(H-M)/(H+M+S) phot.flux;arith.ratio;em.X-ray double nullable hr3 Hardness Ratio from the 0.2-0.5, 0.5-1.0 and 1.0-2.0keV Bands: HR3=(M-S)/(S+M) phot.flux;arith.ratio;em.X-ray double nullable hr4 Hardness Ratio from the 0.2-0.5, 0.5-1.0 and 1.0-2.0keV Bands: HR4=(H-M)/(H+M) phot.flux;arith.ratio;em.X-ray double nullable size_1 Optical SNR Sizes from L10 pc phys.size.diameter double nullable size_2 Optical SNR Sizes from LL14 pc phys.size.diameter double nullable b1_flux Flux in the 0.2-2.0keV Band erg/s/cm^2 phot.flux;em.X-ray double nullable b2_flux Flux in the 0.35-2.0keV Band erg/s/cm^2 phot.flux;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 source_id Unique Identifier for Each Source in This Catalog meta.id;src char nullable b2_counts Source Counts in the 0.35-2keV Band ct phot.count;em.X-ray int nullable sii_ha_ratio_2 [SII]/H-Alpha Ratio from LL14 phys.abund double nullable sii_ha_ratio_1 [SII]/H-Alpha Ratio from L10 phys.abund double nullable b4_counts Source Counts in the 0.7-1.1keV (Medium) Band ct phot.count;em.X-ray short nullable log_lha_2 Logarithm of the H-Alpha Luminosity from LL14 in erg/s log(erg/s) phys.luminosity;em.line.Halpha double nullable b3_counts_error Uncertainty in Source Counts in the 0.3-0.7keV (Soft) Band ct stat.error short nullable b2_counts_error Uncertainty in Source Counts in the 0.35-2keV Band ct stat.error short nullable hr3_error Uncertainty in HR3 stat.error;phot.flux;arith.ratio;em.X-ray double nullable b5_counts Source Counts in the 1.1-4.2keV (Hard) Band ct phot.count;em.X-ray short nullable detect_flag Measurement Level in L10: 3-Sigma, 2-Sigma or Upper Limit (<) meta.note char nullable b3_counts Source Counts in the 0.3-0.7keV (Soft) Band ct phot.count;em.X-ray short nullable alt_name_2 Identification Number in LL14 (Lee & Lee 2014, J/ApJ/793/134) meta.id char nullable alt_name_1 Identification Number in L10 (Long+ 2010, J/ApJS/187/495) meta.id char nullable source_flag Note Concerning Source meta.code;src char nullable hr1_error Uncertainty in HR1 stat.error;phot.flux;arith.ratio;em.X-ray double nullable b4_counts_error Uncertainty in Source Counts in the 0.7-1.1keV (Medium) Band ct stat.error short nullable b1_counts Source Counts in the 0.2-2.0keV Band ct phot.count;em.X-ray int nullable bii Galactic Latitude degree pos.galactic.lat double nullable lii Galactic Longitude degree pos.galactic.lon double nullable log_lha_1 Logarithm of the H-Alpha Luminosity from L10 in erg/s log(erg/s) phys.luminosity;em.line.Halpha double nullable hr4_error Uncertainty in HR4 stat.error;phot.flux;arith.ratio;em.X-ray double nullable b1_counts_error Uncertainty in Source Counts in the 0.2-2.0keV Band ct stat.error short nullable b5_counts_error Uncertainty in Source Counts in the 1.1-4.2keV (Hard) Band ct stat.error short nullable hr2_error Uncertainty in HR2 stat.error;phot.flux;arith.ratio;em.X-ray double nullable