X-ray Sources in the Dwarf Spheroidal Galaxy Draco

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 $L_X>3\times 10^{33}$~erg~s${}^{-1}$ 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.

Accepted for publication in ApJ

References in corpus (14)

• The ATNF Pulsar Catalogue
• The Observed properties of Dark Matter on small spatial scales
• Catalogue of high-mass X-ray binaries in the Galaxy ($4^{th}$ edition)
• The XMM-Newton serendipitous survey. VII. The third XMM-Newton serendipitous source catalogue
• A catalogue of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition)
• Multi-Element Abundance Measurements from Medium-Resolution Spectra. IV. Alpha Element Distributions in Milky Way Dwarf Satellite Galaxies
• Bayesian analysis of resolved stellar spectra: application to MMT/Hectochelle Observations of the Draco dwarf spheroidal
• High mass-to-light ratios of UCDs - Evidence for dark matter ?
• Draco, a flawless dwarf galaxy
• An X-ray Search for Compact Central Sources in Supernova Remnants II: Six Large Diameter SNRs
• Automatic classification of time-variable X-ray sources
• X-Ray Studies of Redbacks
• XMM-Newton observation of a sample of four close dSph galaxies
• The Extreme Ends of the Metallicity Distribution in dSph Galaxies

Cited by in corpus (10)

• A White Paper on keV Sterile Neutrino Dark Matter
• Searching for decaying dark matter in deep XMM-Newton observation of the Draco dwarf spheroidal
• Classifying Unidentified X-ray Sources in the Chandra Source Catalog Using a Multiwavelength Machine-learning Approach
• The X-ray Emissivity of Low-Density Stellar Populations
• Identifying New X-ray Binary Candidates in M31 using Random Forest Classification
• CTIO, ROSAT HRI and Chandra ACIS Observations of the Archetypical Mixed-Morphology Supernova Remnant W28 (G6.4-0.1)
• Classification of low-luminosity stellar X-ray sources in the field of the Draco dwarf spheroidal galaxy
• XMM-Newton study of the Sculptor dwarf spheroidal galaxy
• Multiwavelength survey of X-ray sources in the Sculptor Dwarf Spheroidal Galaxy
• The tidal features of the classical Milky Way satellites: Expected in MOND but inconsistent with cold dark matter models