XMM-Newton study of X-ray sources in the field of Willman 1 dwarf spheroidal galaxy

Abstract

We present the results of the analysis of three XMM-Newton observations of the Willman 1 dwarf spheroidal galaxy (Wil 1). X-ray sources are classified on the basis of spectral analysis, hardness ratios, X-ray-to-optical flux ratio, X-ray variability, plus cross-correlation with available catalogues in optical and infrared wavelengths. We catalogued 97 sources in the field of Wil 1. Our classification shows the presence of a $\beta$-type symbiotic star in Wil 1. We classified one M dwarf foreground star in the field of Wil 1. Moreover, fifty-four sources are classified as background AGNs and galaxies. Our study shows that the luminosity of the X-ray sources of Wil 1 does not exceed $\sim$10${}^{34}$ erg s${}^{-1}$ in the energy range of 0.2--12.0 keV, which is similar to observed luminosities of sources in nearby dwarf spheroidal galaxies.

20 pages, 10 Figures, Accepted MNRAS 11 September 2020

References in corpus (8)

• HI4PI: A full-sky HI survey based on EBHIS and GASS
• The Star Formation Histories of Local Group Dwarf Galaxies I. Hubble Space Telescope / Wide Field Planetary Camera 2 Observations
• The first XMM-Newton slew survey catalogue: XMMSL1
• The WISE AGN Catalog
• Population synthesis of classical low-mass X-ray binaries in the Galactic Bulge
• A search for stellar X-ray sourcesin the Sagittarius and Carina dwarf galaxies - I: X-ray observations
• Classification of low-luminosity stellar X-ray sources in the field of the Draco dwarf spheroidal galaxy
• Multiwavelength survey of X-ray sources in the Sculptor Dwarf Spheroidal Galaxy

Cited by in corpus (5)

• Symbiotic stars in the era of modern ground- and space-based surveys
• XMM-Newton study of the Sculptor dwarf spheroidal galaxy
• Broad Observational Perspectives Achieved by the Accreting White Dwarf Sciences in the XMM-Newton and Chandra Eras
• eROSITA (eRASS1) study of the Canis Major overdensity: Developing a multi-wavelength algorithm for classifying faint X-ray sources
• Willman 1 Revisited: The Kinematics, Chemistry, and Orbital Properties of a Potentially-Disrupting Dwarf Galaxy