LMC30DRCXO ivo://nasa.heasarc/lmc30drcxo NASA/GSFC HEASARC Townsley et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the results of a study of the X-ray point-source population of the 30 Doradus (30 Dor) star-forming complex in the Large Magellanic Cloud (LMC) using high spatial-resolution X-ray images and spatially-resolved spectra obtained with the Advanced CCD Imaging Spectrometer (ACIS) on board the Chandra X-Ray Observatory. The observation of ~21 ks was made on 1999 September 21 and placed the cluster R136 at the aim point of the ACIS Imaging Array (ACIS-I). This table lists the the X-ray sources detected in the 17' x 17' field centered on R136, the massive star cluster which lies at the center of the main 30 Dor nebula. 20 of the 32 Wolf-Rayet stars in the ACIS field are detected. The cluster R136 is resolved at the sub-arcsecond level into almost 100 X-ray sources, including many typical O3-O5 stars, as well as a few bright X-ray sources which had been previously reported. Over 2 orders of magnitude of scatter in the X-ray luminosity L<sub>x</sub> (calculated assuming a distance of 50 kpc) is seen among R136 O stars, suggesting that X-ray emission in the most massive stars depends critically on the details of wind properties and the binarity of each system, rather than reflecting the widely reported characteristic value L<sub>x</sub>/L<sub>bol</sub> ~ 10<sup>-7</sup>. Such a canonical ratio may exist for single massive stars in R136, but these data are too shallow to confirm this relationship. Through this and more recent X-ray studies of 30 Dor, the complete life cycle of a massive stellar cluster can be revealed. This HEASARC table contains both the primary high-significance X-ray sources as well as some lower-significance tentative X-ray sources. The latter sources should not be considered definitive. A subsequent Chandra observation of this field, with several times the exposure of this observation, will result in a longer, more complete list of point sources than that given in this paper. This table was created by the HEASARC in February 2007 based on the merger of electronic versions of Tables 1, 2 and 5 from the above reference which were obtained from the AJ website. It does not include the results from the spectral analysis of 49 of the X-ray sources having a photometric significance (signal-to-noise ratio) greater than 2 which are presented in Tables 3 and 4 of the reference paper. This is a service provided by NASA HEASARC . 2006AJ....131.2164T https://heasarc.gsfc.nasa.gov/W3Browse/all/lmc30drcxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=lmc30drcxo& GET text/xml 180 99999 true 84.28187 -69.212077 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=lmc30drcxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_lmc30drcxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 Infrared Optical X-ray public lmc30drcxo LMC 30 Doradus Complex Chandra X-Ray Point Source Catalog name Chandra Source Designation (CXOU J+) meta.id;meta.main char nullable alt_name Catalog Source Designation ([TBF2006]) 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 error_radius Formal 1-Sigma Radial Positional Error arcsec stat.error;pos float nullable counts Net Full-Band (0.5-8 keV) Extracted Counts ct phot;em.X-ray double nullable counts_error The 1-Sigma Error in Net Full-Band Counts ct stat.error;phot 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 psf_fraction PSF Fraction Used to Extract the Source double nullable off_set Separation between Chandra Position and Counterpart Position (arcsec) arcsec char nullable off_axis Off-Axis Angle (arcmin) arcmin instr.offset double nullable median_energy Background-Corrected Median Energy Estimate (keV) keV double nullable spect_type Spectral Type src.spType char nullable bat99_number BAT99 Number char nullable bii Galactic Latitude degree pos.galactic.lat double nullable bck_counts Estimated Background Counts in Extraction Region ct double nullable lii Galactic Longitude degree pos.galactic.lon double nullable anomaly_flags Flags Indicates Observational Anomalies char nullable dec_2mass_j2000 2MASS Declination (J2000) degree double nullable source_sample Field Indicates Either Primary (Table 1) Source or Tentative (Table 2) Source char nullable ppl02_name PPL02 Designation char nullable hb_counts Net Hard-Band (2-8 keV) Extracted Counts ct double nullable p93_number P93 Number short nullable snr Photometric Significance stat.snr double nullable prob_fluct Logarithm of Probability That Source Is Solely a Background Fluctuation double nullable variable_flag Flag Indicates Likelihood of Displaying Variability char nullable prob_fluct_limit Limit Flag for Logarithm of Source Probability char nullable exposure Effective Exposure Time (s) s time.duration;obs.exposure double nullable comments Comments char nullable mh94_number MH94 Number char nullable source_number Sequential Identification Number for Each Source in Catalog meta.id short nullable class Browse Object Classification src.class short nullable ra_2mass_j2000 2MASS Right Ascension (J2000) degree double nullable