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2002ApJS..143...25C - Astrophys. J., Suppl. Ser., 143, 25-45 (2002/November-0)

A catalog of candidate intermediate-luminosity X-ray objects.

COLBERT E.J.M. and PTAK A.F.

Abstract (from CDS):

ROSAT, and now Chandra, X-ray images allow studies of extranuclear X-ray point sources in galaxies other than our own. X-ray observations of normal galaxies with ROSAT and Chandra have revealed that off-nuclear, compact, intermediate-luminosity (LX[2-10keV]≥1039.0 ergs/s) X-ray objects (IXOs, a.k.a. ULXs [ultraluminous X-ray sources]) are quite common. Here we present a catalog and finding charts for 87 IXOs in 54 galaxies, derived from all of the ROSAT HRI imaging data for galaxies with cz≤5000 km/s from the Third Reference Catalog of Bright Galaxies. We have defined the cutoff LXfor IXOs so that it is well above the Eddington luminosity of a 1.4 Mblack hole (1038.3 ergs.s–1), so as not to confuse IXOs with normal'' black hole X-ray binaries. This catalog is intended to provide a baseline for follow-up work with Chandra and XMM-Newton, and with space- and ground-based survey work at wavelengths other than X-ray. We demonstrate that elliptical galaxies with IXOs have a larger number of IXOs per galaxy than nonelliptical galaxies with IXOs and note that they are not likely to be merely high-mass X-ray binaries with beamed X-ray emission, as may be the case for IXOs in starburst galaxies. Approximately half of the IXOs with multiple observations show X-ray variability, and many (19) of the IXOs have faint optical counterparts in DSS optical B-band images. Follow-up observations of these objects should be helpful in identifying their nature.

Journal keyword(s): Catalogs - Galaxies: General - X-Rays: Binaries - X-Rays: Galaxies

VizieR on-line data: <Available at CDS (J/ApJS/143/25): table1.dat table2.dat>

Nomenclature: Table 1: IXO NN (Nos 1-87).