ROSAT X-ray sources in the field of the LMC. II.Statistics of background AGN and X-ray binaries

Abstract

About 200 X-ray sources from a sample of spectrally hard ROSAT PSPC sources, given in the catalog of Haberl & Pietsch (1999), and observed in a ~60 square degree field of the LMC during several archival pointed observations with a wide range of exposure times have been reanalyzed. For these sources accurate count rates and hardness ratios have been recalculated. In comparison to Haberl & Pietsch (1999) we used merged data from all available observations and we derived average source parameters by investigating each source individually. From a simulation powerlaw spectral tracks have been derived in the HR1 - HR2 plane and ~170 sources have been classified as background X-ray sources or as LMC X-ray binaries. 80% of the spectrally hard X-ray sources with more than 50 observed counts have been found to be consistent with background X-ray sources and 20% with LMC X-ray binaries (53 sources with AGN and 15 with X-ray binaries). The discovery of a new supersoft source RX J0529.4-6713 at the southern HI boundary of the supergiant shell LMC4 is reported. We find two new candidate X-ray binary systems which are associated with the optical bar of the LMC and additional candidate X-ray binaries which are associated with supergiant shells.

13 pages, accepted for publication in A&A, March 22 2002

References in corpus (10)

• Testing current synthesis models of the X-ray background
• The Progenitor Masses of Wolf-Rayet Stars and Luminous Blue Variables Determined from Cluster Turn-offs. I. Results from 19 OB Associations in the Magellanic Clouds
• Updated Information on the Local Group
• The second ROSAT PSPC survey of M31 and the complete ROSAT PSPC source list
• ROSAT HRI catalogue of X-ray sources in the SMC region
• A Study of the Populations of X-ray Sources in the Small Magellanic Cloud with ASCA
• Optical studies of two LMC X-ray transients : RX J0544.1-7100 and RX J0520.5-6932
• Discovery of Pulsed X-rays from the SMC Transient RX J0052.1-7319
• ROSAT X-ray sources in the field of the LMC I.Total LMC gas from the background AGN spectral fits
• ROSAT X-ray sources in the field of the LMC. III.The log N -- log S of background AGN and the LMC gas

Cited by in corpus (8)

• Star-formation history and X-ray binary populations: the case of the Large Magellanic Cloud
• High mass X-ray binaries in the LMC: dependence on the stellar population age and the "propeller" effect
• The ASKAP-EMU Early Science Project: 888 MHz Radio Continuum Survey of the Large Magellanic Cloud
• Massive black hole remnants of the first stars II: optical and X-ray signatures in present-day galactic haloes
• Three new high-mass X-ray binaries in the Large Magellanic Cloud
• X-Ray Properties of the Point Source Population in the Spiral Galaxy NGC 5055 (M63) with Chandra
• Analysis of possible anomalies in the QSO distribution of the Flesch & Hardcastle catalogue
• ROSAT X-ray sources in the field of the LMC. III.The log N -- log S of background AGN and the LMC gas