NGC4365CXO ivo://nasa.heasarc/ngc4365cxo NASA/GSFC HEASARC Sivakoff et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The authors used the Chandra X-Ray Observatory ACIS-S3 to image the X-ray-faint elliptical galaxy NGC 4365 and the lenticular galaxy NGC 4382. This table presents only the NGC 4365 results; however, the results for NGC 4382 are also available in <a href="ngc4382cxo.html">a separate table</a>. NGC 4365 was observed on 2001 June 23 with a live exposure of 40429 s. The observations resolved much of the X-ray emission into 99 sources for NGC 4365, most of which are low-mass X-ray binaries (LMXBs) associated with the galaxy. Within one effective radius of NGC 4365, about 45% of the counts were resolved into sources, 30% were attributed to unresolved LMXBs, and 25% were attributed to diffuse gas. The authors identified 18 out of the 37 X-ray sources in a central field in NGC 4365 with globular clusters. The authors defined two hardness ratios: HR21 = (M - S)/(M + S) and HR31 = (H - S)/(H + S), where S, M, and H are the total counts in the soft (0.3 - 1 keV), medium (1 - 2 keV), and hard (2 - 10 keV) bands, respectively. This table was created by the HEASARC in June 2018 based upon the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJ/599/218">CDS Catalog J/ApJ/599/218</a> file table1.dat. This is a service provided by NASA HEASARC . 2003ApJ...599..218S https://heasarc.gsfc.nasa.gov/W3Browse/all/ngc4365cxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ngc4365cxo& GET text/xml 180 99999 true 186.14975 7.25925 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ngc4365cxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ngc4365cxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public ngc4365cxo NGC 4365 Chandra LMXB Catalog source_number Sequential Identification Number for Each Source in the Catalog meta.id;src short nullable name Chandra Source Designation (CXOU JHHMMSS.s+DDMMSS) 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 count_rate X-Ray Count Rate ct/s phot.count;em.X-ray double nullable count_rate_error RMS Uncertainty in X-Ray Count Rate ct/s stat.error;phot.count;em.X-ray double nullable lx X-Ray Luminosity in the 0.3-10keV Band erg/s phys.luminosity;em.X-ray double nullable radial_distance Distance from the Center of the Galaxy arcmin pos.angDistance 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 hardness_ratio21 Hardness Ratio 21, (M-S)/(M+S) phot.flux;arith.ratio;em.X-ray double nullable alt_name Alternative Catalog-Based Source Designation meta.id char nullable hardness_ratio31_pos_err Error in Hardness Ratio 31 (Upper Limit) stat.error;phot.flux;arith.ratio;em.X-ray double nullable hardness_ratio21_pos_err Error in Hardness Ratio 21 (Upper Limit) stat.error;phot.flux;arith.ratio;em.X-ray double nullable source_flags Flag(s) [abcdefg] Indicate Note(s) Concerning the Source meta.code;src char nullable snr Signal-to-Noise Ratio stat.snr double nullable hardness_ratio31 Hardness Ratio 31, (H-S)/(H+S) phot.flux;arith.ratio;em.X-ray double nullable bii Galactic Latitude degree pos.galactic.lat double nullable hardness_ratio21_neg_err Error in Hardness Ratio 21 (Lower Limit) stat.error;phot.flux;arith.ratio;em.X-ray double nullable hardness_ratio31_neg_err Error in Hardness Ratio 31 (Lower Limit) stat.error;phot.flux;arith.ratio;em.X-ray double nullable lii Galactic Longitude degree pos.galactic.lon double nullable