The X-ray source population of the globular cluster M15: Chandra high resolution imaging

Details The X-ray source population of the globular cluster M15: Chandra high resolution imaging The X-ray source population of the globular cluster M15: Chandra high resolution imaging

2004-11-22

arxiv.org/abs/astro-ph/0411600v1

Mon.Not.Roy.Astron.Soc. 357 (2005) 325-332

Astronomy and Astrophysics

Astrophysics

9 pages, 6 figures, accepted for publication in MNRAS. Original figures can be obtained from http://www.astro.helsinki.fi/~dia

Scientific paper

10.1111/j.1365-2966.2004.08652.x

The globular cluster M15 was observed on three occasions with the High Resolution Camera on board Chandra in 2001 in order to investigate the X-ray source population in the cluster centre. After subtraction of the two bright central sources, four faint sources were identified within 50 arcsec of the core. One of these sources is probably the planetary nebula, K648, making this the first positive detection of X-rays from a planetary nebula inside a globular cluster. Another two are identified with UV variables (one previously known), which we suggest are cataclysmic variables (CVs). The nature of the fourth source is more difficult to ascertain, and we discuss whether it is possibly a quiescent soft X-ray transient (qSXT) or also a CV.

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