FORNAXXMM ivo://nasa.heasarc/fornaxxmm NASA/GSFC HEASARC Nucita et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains some of the results of a deep archive XMM-Newton observation of the Fornax spheroidal galaxy that the authors analyzed with the aim of fully characterizing the X-ray source population (in most of the cases likely to be background active galactic nuclei) detected towards the target. A cross-correlation with the available databases allowed them to find a source that may be associated with a variable star belonging to the galaxy. The authors also searched for X-ray sources in the vicinity of the Fornax globular clusters GC 3 and GC 4 and found two sources probably associated with the respective clusters. The deep X-ray observation was also suitable for the search for the intermediate-mass black hole (of mass ~ 10<sup>4</sup> solar masses) expected to be hosted in the center of the galaxy. In the case of Fornax, this search is extremely difficult since the galaxy centroid of gravity is poorly constrained because of the large asymmetry observed in the optical surface brightness. Since the authors cannot firmly establish the existence of an X-ray counterpart of the putative black hole, they put constraints only on the accretion parameters. In particular, they found that the corresponding upper limit on the accretion efficiency, with respect to the Eddington luminosity, is as low as a few 10<sup>-5</sup>. This table was created by the HEASARC in February 2013 based on an electronic version of Table 1 from the reference paper which was obtained from the A&A web site. This is a service provided by NASA HEASARC . 2013A&A...550A..18N https://heasarc.gsfc.nasa.gov/W3Browse/all/fornaxxmm.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=fornaxxmm& GET text/xml 180 99999 true 39.96125 -34.67675 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=fornaxxmm GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_fornaxxmm&Action=More+Options&Action=Parameter+Search&ConeAdd=1 XMM-NEWTON 0.0166666666666667 X-ray public fornaxxmm Fornax Dwarf Galaxy XMM-Newton X-Ray Point Source Catalog name Catalog-Based 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 error_radius Positional Uncertainty arcsec stat.error;pos double nullable flux Absorbed 0.2-12keV Flux erg/s/cm^2 phot.flux;em.X-ray double nullable flux_error Uncertainty in Absorbed 0.2-12keV Flux erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable hardness_ratio_1 Hardness Ratio, HR1 = (H-M)/(S+M+H) phot.flux;arith.ratio;em.X-ray double nullable hardness_ratio_1_error Uncertainty in Hardness Ratio 1 stat.error;phot.flux;arith.ratio;em.X-ray double nullable hardness_ratio_2 Hardness Ratio, HR2 = (M-S)/(S+M+H) phot.flux;arith.ratio;em.X-ray double nullable hardness_ratio_2_error Uncertainty in Hardness Ratio 2 stat.error;phot.flux;arith.ratio;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 lii Galactic Longitude degree pos.galactic.lon double nullable detect_flag Flag [ABCDEFG] Indicates Detecting Camera meta.code char nullable xmm_usnob1_offset Offset of USNO-B1 Source from X-Ray Position arcsec pos.angDistance;em.X-ray;em.opt double nullable xmm_2mass_offset Offset of 2MASS Source from X-Ray Position arcsec pos.angDistance;em.X-ray;em.IR double nullable bii Galactic Latitude degree pos.galactic.lat double nullable source_flags Flags [MVP] Indicates Source Note, P=Near PPM Source meta.code;src char nullable source_number Sequential Identification Number for Each Source in Catalog meta.id;src short nullable