X-ray Binaries in the Fornax Local Group Dwarf

Details X-ray Binaries in the Fornax Local Group Dwarf X-ray Binaries in the Fornax Local Group Dwarf

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915502k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #155.02; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Local Group dwarfs offer a unique opportunity to study X-ray populations: their proximity allows the detection of lower luminosity sources than is possible outside the Local Group. In this poster, we describe a 100ks XMM-Newton observation of the Fornax Dwarf Spheroidal (dSh) galaxy. The main observational goal is to detect X-ray sources down to a luminosity limit of approximately 3E33 erg/s. Since the Fornax dSh shows very little evidence for recent star formation, we expect most detected sources to be either low mass X-ray binaries (LMXBs) or background sources. This limit is much deeper than has been obtained in any previous X-ray survey of LMXB sources, and enables us to detect LMXBs in quiescence.
Using standard SAS routines, we combined the PN and MOS images and ran the source detection routine wavedetect. We detect approximately 130 sources down to a luminosity of 5E33 erg/s in the XMM field of view. The cumulative X-ray luminosity function is a power law with flattening below 6.8E33 ergs/s which may be due to incompleteness. Approximately 40 of the sources lie within the D25 ellipse of the galaxy. Comparison with the Optical Monitor data shows that at least 12 of the detected sources within D25 are coincident with a bright UV source, and hence are likely to be background AGN. This number is consistent with the log(N)-log(S) relationship of Campana et al. (2001, ApJL, 560,19). We therefore have 28 sources that are likely LMXBs in Fornax.

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