| Type |
Conference Paper |
| Names |
Nicholas Hunt-Walker, M. Orio, L. Pavan, E. Held, S. Ciroi, F. Di Mille, J. Gallagher, U. Munari |
| Proceedings Title |
Bulletin of the American Astronomical Society |
| Conference Name |
American Astronomical Society, AAS Meeting #215, #457.06 |
| Volume |
42 |
| Pages |
480 |
| Date |
January 1, 2010 |
| URL |
http://adsabs.harvard.edu/abs/2010AAS...21545706H |
| Library Catalog |
NASA ADS |
| Abstract |
We present a new deep XMM-Newton image of the field of the dwarf
spheroidal galaxy Leo I, and compare it with an archival XMM-Newton
image of the dwarf spheroidal galaxy Fornax. We find 74 X-ray sources in
the Leo I field, and 89 in the Fornax field. Although the spatial
distribution does not increase much towards the center of the galaxies,
there is an excess of X-ray sources in comparison with other low N(H)
regions observed with deep X-ray pointings. Comparing with public and
proprietary multi-filter optical observations, we identify a small
number of candidate X-ray binaries in each galaxy, as well as several
candidate AGN. The possibility to study the X-ray population in a
"pristine” environment with known star formation history opens up
new possibilities, and the Local Group offers several optimal
environments for this project. An HR diagram of the candidate optical
counterparts of the X-ray sources in the fields of the two galaxies,
reaching visual magnitude V=25.5, is presented. |