NGC 2547 XMM-Newton X-Ray Point Source Catalog NGC2547XMM ivo://nasa.heasarc/ngc2547xmm NASA/GSFC HEASARC Jeffries et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains a list of point sources detected by XMM-Newton EPIC in a pointing towards the young open cluster NGC 2547, made in order to allow the authors to characterize coronal activity in solar-type stars, and stars of lower mass, at an age of 30 Myr. X-ray emission was seen from stars at all spectral types, peaking among G stars at luminosities (0.3 - 3 keV) of L<sub>x</sub> ~= 10<sup>30.5</sup> erg/s and declining to L<sub>x</sub> <= 10<sup>29</sup> erg/s among M stars with masses >=0.2 solar masses. Coronal spectra show evidence for multi-temperature differential emission measures and low coronal metal abundances of Z~= 0.3. Most of the solar-type stars in NGC 2547 exhibit saturated or even supersaturated X-ray activity levels. The median levels of L<sub>x</sub> and L<sub>x</sub>/L<sub>bol</sub> in the solar-type stars of NGC 2547 are very similar to those in T-Tauri stars of the Orion Nebula cluster (ONC), but an order of magnitude higher than in the older Pleiades. The spread in X-ray activity levels among solar-type stars in NGC 2547 is much smaller than in older or younger clusters. This table contains the properties of those X-ray sources which are correlated with optical cluster members (see Section 2.2 of the reference paper for details on the correlation procedure that was adopted), as well as the properties of those X-ray sources which are uncorrelated with any optical cluster members. The table lists the cross-identifications with optical catalogs for the candidate cluster sources along with their X-ray luminosities and X-ray to bolometric flux ratios, as well as the correlations between cluster members which were detected by XMM-Newton and those detected 7 years earlier by the ROSAT HRI instrument, along with the X-ray luminosities and flux ratios as determined by the HRI. This table was created by the HEASARC in February 2007 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/MNRAS/367/781">CDS Catalog J/MNRAS/367/781</a> files table1.dat, table2.dat, table3.dat and table7.dat. This is a service provided by NASA HEASARC . 2006MNRAS.367..781J https://heasarc.gsfc.nasa.gov/W3Browse/all/ngc2547xmm.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ngc2547xmm& GET text/xml 180 99999 true 122.39270833 -49.4225 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ngc2547xmm GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ngc2547xmm&Action=More+Options&Action=Parameter+Search&ConeAdd=1 XMM-NEWTON 0.0166666666666667 Optical X-ray public ngc2547xmm NGC 2547 XMM-Newton X-Ray Point Source Catalog name Catalog Source Designation meta.id char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable pn_count_rate PN Count Rate in Total Band (0.3-3keV) ct/s double nullable pn_count_rate_error Error in PN Count Rate in Total Band ct/s double nullable lx X-Ray Luminosity (0.3-3 keV) (erg/s) erg/s double nullable lx_error Uncertainty in X-Ray Luminosity erg/s double nullable vmag Apparent V Magnitude (Johnson) mag phot.mag;em.opt.V double nullable bv_color B-V Color Index (Johnson) mag phot.color;em.opt.B;em.opt.V 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 m1_hb_count_rate_error Error in M1 Count Rate in Hard Band ct/s double nullable lx_lbol_ri X-Ray/Bolometric Luminosity Ratio Using R-I for Bolometric Correction double nullable m2_hb_count_rate_error Error in M2 Count Rate in Hard Band ct/s double nullable m1_hb_count_rate M1 Count Rate in Hard Band (1.0-3keV) ct/s double nullable hri_lx_lbol_ri HRI X-Ray/Bolometric Luminosity Ratio Using R-I for Bolometric Correction double nullable offset_hri_xmm Separation between XMM and HRI Sources (arcsec) arcsec double nullable hri_count_rate_limit Limit Flag for HRI Count Rate char nullable m1_hardness_ratio M1 Hardness Ratio double nullable m1_hardness_ratio_error Error in M1 Hardness Ratio double nullable m2_count_rate M2 Count Rate in Total Band (0.3-3keV) ct/s double nullable pn_hb_count_rate PN Count Rate in Hard Band (1.0-3keV) ct/s double nullable m1_count_rate M1 Count Rate in Total Band (0.3-3keV) ct/s double nullable ri_color Rc-Ic Color (Cousins) Index mag double nullable lx_lbol_bv X-Ray/Bolometric Luminosity Ratio Using B-V for Bolometric Correction double nullable error_radius Positional Error (1-Sigma) arcsec stat.error;pos float nullable pn_sb_count_rate_error Error in PN Count Rate in Soft Band ct/s double nullable lx_lbol_vi X-Ray/Bolometric Luminosity Ratio Using V-I for Bolometric Correction double nullable bii Galactic Latitude degree pos.galactic.lat double nullable m2_hardness_ratio_error Error in M2 Hardness Ratio double nullable alt_name XMM-Newton Source Identification meta.id char nullable m2_count_rate_error Error in M2 Count Rate in Total Band ct/s double nullable pn_sb_count_rate PN Count Rate in Soft Band (0.3-1keV) ct/s double nullable m1_sb_count_rate_error Error in M1 Count Rate in Soft Band ct/s double nullable ntj_identifier Identifier Used by Naylor et al. (2002), Cl* NGC 2547 NTJ NN-NNNN in SIMBAD char nullable hri_lx_lbol_bv HRI X-Ray/Bolometric Luminosity Ratio Using B-V for Bolometric Correction double nullable m2_sb_count_rate M2 Count Rate in Soft Band (0.3-1keV) ct/s double nullable pn_hardness_ratio PN Hardness Ratio double nullable jnd_identifier Identifier Used by Jeffries et al. (2004), Cl* NGC 2547 JND FF-NNNN in SIMBAD char nullable hri_lx_lbol_vi HRI X-Ray/Bolometric Luminosity Ratio Using V-I for Bolometric Correction double nullable hri_lx HRI X-Ray Luminosity (0.3-3 keV) (erg/s) erg/s double nullable offset_ntj_xmm Separation Between XMM Source and NTJ Counterpart (arcsec) arcsec double nullable cluster_member Flag Indicates XMM-Newton Source Correlated with NGC 2547 Members char nullable pn_hardness_ratio_error Error in PN Hardness Ratio double nullable m2_hb_count_rate M2 Count Rate in Hard Band (1.0-3keV) ct/s double nullable offset_jnd_xmm Separation Between XMM Source and JND Counterpart (arcsec) arcsec double nullable source_number SAS Source Identification Number meta.id;meta.main short nullable m2_hardness_ratio M2 Hardness Ratio double nullable m1_count_rate_error Error in M1 Count Rate in Total Band ct/s double nullable hri_count_rate HRI Count Rate ct/s double nullable vi_color V-Ic Color Index (Cousins) mag double nullable ml_statistic Maximum Likelihood double nullable imag Apparent I Magnitude (Cousins) mag phot.mag;em.opt.I double nullable pn_hb_count_rate_error Error in PN Count Rate in Hard Band ct/s double nullable hri_count_rate_error Error in HRI Count Rate ct/s double nullable m2_sb_count_rate_error Error in M2 Count Rate in Soft Band ct/s double nullable m1_sb_count_rate M1 Count Rate in Soft Band (0.3-1keV) ct/s double nullable hri_identifier RX ROSAT HRI Identifier Used by Jeffries & Tolley (1998MNRAS.300..331J) short nullable lii Galactic Longitude degree pos.galactic.lon double nullable