English

X-ray Sources in the Dwarf Spheroidal Galaxy Draco

Astrophysics of Galaxies 2016-04-27 v4 High Energy Astrophysical Phenomena

Abstract

We present the spectral analysis of an 87~ks \emph{XMM-Newton} observation of Draco, a nearby dwarf spheroidal galaxy. Of the approximately 35 robust X-ray source detections, we focus our attention on the brightest of these sources, for which we report X-ray and multiwavelength parameters. While most of the sources exhibit properties consistent with AGN, few of them possess characteristics of LMXBs and CVs. Our analysis puts constraints on population of X-ray sources with LX>3×1033L_X>3\times10^{33}~erg~s1^{-1} in Draco suggesting that there are no actively accreting BH and NS binaries. However, we find 4 sources that could be LMXBs/CVs in quiescent state associated with Draco. We also place constraints on the central black hole luminosity and on a dark matter decay signal around 3.5~keV.

Keywords

Cite

@article{arxiv.1505.00216,
  title  = {X-ray Sources in the Dwarf Spheroidal Galaxy Draco},
  author = {E. Sonbas and B. Rangelov and O. Kargaltsev and K. S. Dhuga and J. Hare and I. Volkov},
  journal= {arXiv preprint arXiv:1505.00216},
  year   = {2016}
}

Comments

Accepted for publication in ApJ