skip to main content

Title: X-RAY SOURCES IN THE DWARF SPHEROIDAL GALAXY DRACO

We present the spectral analysis of an 87 ks 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 active galactic nuclei, few of them possess the characteristics of low-mass X-ray binaries (LMXBs) and cataclysmic variable (CVs). Our analysis places constraints on the population of X-ray sources with L{sub X} > 3 × 10{sup 33} erg s{sup −1} in Draco, suggesting that there are no actively accreting black hole and neutron star binaries. However, we find four sources that could be quiescent state LMXBs/CVs associated with Draco. We also place constraints on the central black hole luminosity and on a dark matter decay signal around 3.5 keV.
Authors:
 [1] ; ; ; ; ;  [2]
  1. University of Adiyaman, Department of Physics, 02040 Adiyaman (Turkey)
  2. Department of Physics, The George Washington University, Washington, DC 20052 (United States)
Publication Date:
OSTI Identifier:
22518481
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 821; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; BLACK HOLES; CARBON; COSMIC X-RAY SOURCES; DETECTION; GALAXIES; GALAXY NUCLEI; KEV RANGE; LIMITING VALUES; LUMINOSITY; MASS; NEUTRON STARS; NONLUMINOUS MATTER; NOVAE; STAR ACCRETION