Issue |
A&A
Volume 459, Number 3, December I 2006
|
|
---|---|---|
Page(s) | 777 - 781 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20065959 | |
Published online | 12 September 2006 |
A search for stellar X-ray sources in the Sagittarius and Carina dwarf galaxies
I. X-ray observations
1
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK e-mail: gtbr@mssl.ucl.ac.uk
2
School of Physics A28, University of Sydney, NSW 2006, Australia
Received:
3
July
2006
Accepted:
26
August
2006
ROSAT observations found no convincing evidence for
X-ray sources located in local dwarf spheroidal galaxies (dSph). Now
with more sensitive instruments on board Chandra and XMM-Newton we
can reach fainter luminosity levels. We report on an observation of
the Sagittarius (Sgr) dSph made using Chandra and an observation
of the Carina (Car) dSph made using XMM-Newton. Our observations are
sensitive to sources with X-ray luminosities in the 0.1–10 keV band
of ~ erg s-1 and 3
erg s-1 for the Sgr
and Car fields respectively. We have identified a total of 80 sources
in the Sgr field and 53 sources in the Car field. Although the source
numbers are roughly consistent with the expected number of background
AGN, we found a small fraction of X-ray sources which were soft and
could be located in the host dSph. Follow-up optical/IR observations
may help to identify their optical counterparts and hence determine
their nature.
Key words: galaxies: dwarf / galaxies: individual: Sagittarius / galaxies: individual: Carina / X-rays: binaries / X-rays: galaxies
© ESO, 2006
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