| Issue |
A&A
Volume 424, Number 1, September II 2004
|
|
|---|---|---|
| Page(s) | 133 - 143 | |
| Section | Galactic structure, stellar clusters, and populations | |
| DOI | https://doi.org/10.1051/0004-6361:20040399 | |
| Published online | 17 August 2004 | |
X-ray sources and their optical counterparts in the globular cluster M 22
1
Centre d'Étude Spatiale des Rayonnements, 9 avenue du Colonel Roche, 31028 Toulouse Cedex 04, France e-mail: Natalie.Webb@cesr.fr
2
Istituto di Astrofisica Spaziale e Fisica Cosmica, CNR, via Fosso del Cavaliere, Roma, Italy
3
Institut d'Astrophysique de Paris, 98bis boulevard Arago, 75014 Paris, France
4
INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padua, Italy
Received:
5
March
2004
Accepted:
26
May
2004
Using XMM-Newton EPIC imaging data, we have detected 50 low-luminosity X-ray sources in the field of view of M 22, where
of these sources are likely to be related to the cluster.
Using differential optical photometry, we have identified probable
counterparts to those sources belonging to the cluster. Using
X-ray spectroscopic and timing studies, supported by the optical
colours, we propose that the most central X-ray sources in the
cluster are cataclysmic variables, millisecond pulsars, active
binaries and a blue straggler. We also identify a cluster of
galaxies behind this globular cluster.
Key words: Galaxy: globular clusters: individual: M 22 / X-rays: general / stars: binaries: general / galaxies: clusters: general
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.