NGC1399CXO ivo://nasa.heasarc/ngc1399cxo NASA/GSFC HEASARC Paolillo et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains results from a wide-field study of the globular cluster (GC)/low-mass X-ray binary (LMXB) connection in the giant elliptical NGC 1399. The large field of view of the Advanced Camera for Surveys/WFC, combined with the high resolution of the Hubble Space Telescope and Chandra, allow the authors to constrain the LMXB formation scenarios in elliptical galaxies. They confirm that NGC 1399 has the highest LMXB fraction in GCs of all nearby elliptical galaxies studied so far, even though the exact value depends on galactocentric distance due to the interplay of a differential GC versus galaxy light distribution and the GC color dependence. In fact, LMXBs are preferentially hosted by bright, red GCs out to > 5 R<sub>eff</sub> of the galaxy light. The finding that GCs hosting LMXBs follow the radial distribution of their parent GC population argues against the hypothesis that the external dynamical influence of the galaxy affects the LMXB formation in GCs. On the other hand, field-LMXBs closely match the host galaxy light, thus indicating that they are originally formed in situ and not inside GCs. The authors measure GC structural parameters, finding that the LMXB formation likelihood is influenced independently by mass, metallicity, and GC structural parameters. In particular, the GC central density plays a major role in predicting which GCs host accreting binaries. Finally, this analysis shows that LMXBs in GCs are marginally brighter than those in the field, and in particular the only color-confirmed GC with L<sub>X</sub> > 10<sup>39</sup> erg/s shows no variability, which may indicate a superposition of multiple LMXBs in these systems. The optical data were taken with the ACS on board the HST (GO-10129), in the F606W filter. A detailed description of the HST data and source catalogs are given in Puzia T.H. et al. 2011, in preparation. The X-ray data were retrieved from the Chandra public archive (CXC). The authors selected observations 319 (ACIS-S; 2000 Jan 18) and 1472 (ACIS-I; 2003 May 26). This table contains the list of 230 X-ray sources detected in the overlap region common to Chandra ACIS-I, Chandra ACIS-S and HST ACS observation (see Fig 1 of the reference paper). Details of the X-ray source detection methodology are given in Section 2.2 of the reference paper. This table was created by the HEASARC in January 2013 based on the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJ/736/90">CDS Catalog J/ApJ/736/90</a> file table3.dat. This is a service provided by NASA HEASARC . 2011ApJ...736...90P https://heasarc.gsfc.nasa.gov/W3Browse/all/ngc1399cxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ngc1399cxo& GET text/xml 180 99999 true 54.63916667 -35.54152778 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ngc1399cxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ngc1399cxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public ngc1399cxo NGC 1399 Chandra X-Ray Source Catalog source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable 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 counts Total Net 0.5-8keV Counts ct phot;em.X-ray double nullable counts_neg_err Lower Uncertainty in Net Counts ct stat.error;phot;em.X-ray double nullable counts_pos_err Upper Uncertainty in Net Counts ct stat.error;phot;em.X-ray double nullable photon_flux The 0.5-8keV Photon Flux photon/s/cm^2 phot.flux;em.X-ray double nullable photon_flux_error Uncertainty in Photon Flux photon/s/cm^2 stat.error;phot.flux;em.X-ray double nullable off_set X-Ray and Optical Positions Separation arcsec pos.angDistance;em.X-ray;em.opt double nullable vmag HST F606V-Band Magnitude mag phot.mag;em.opt.V double nullable hardness_ratio_1_error Uncertainty in Hardness Ratio 1 stat.error;phot.flux;arith.ratio;em.X-ray.soft double nullable ct1_color Ground-Based (C-T1) Color mag phot.color;em.opt double nullable bii Galactic Latitude degree pos.galactic.lat double nullable lii Galactic Longitude degree pos.galactic.lon double nullable zmag ACS z-Band Magnitude mag phot.mag;em.opt double nullable variability_flag Flag [0/1] Indicates Variability meta.code;src.var short nullable gz_color ACS (g-z) Color Index mag phot.color;em.opt double nullable hardness_ratio_1_flag Flag [i] Indicates an Infinite HR1 Uncertainty meta.code;phot.flux;arith.ratio;em.X-ray.soft char nullable stellarity_index Flag [0/1] Indicates SExtractor Stellarity Index (0=Galaxy; 1=Star) meta.code;src double nullable hardness_ratio_2 The (0.5-1keV)/(1-8keV) Hardness Ratio phot.flux;arith.ratio;em.X-ray double nullable hardness_ratio_2_flag Flag [i] Indicates an Infinite HR2 Uncertainty meta.code;phot.flux;arith.ratio;em.X-ray char nullable hardness_ratio_2_error Uncertainty in Hardness Ratio 2 stat.error;phot.flux;arith.ratio;em.X-ray double nullable t1_mag Ground-Based T1-Band Magnitude mag phot.mag;em.opt.R double nullable hardness_ratio_1 The (0.5-1keV)/(1-2keV) Hardness Ratio phot.flux;arith.ratio;em.X-ray.soft 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