4.7 Article

XMM-Newton study of the Sculptor dwarf spheroidal galaxy

期刊

出版社

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac708

关键词

Binaries: symbiotic; X-rays: binaries; galaxies: dwarf galaxies

资金

  1. BMWi/DLR research grant [50OR1907]
  2. National Aeronautics and Space Administration
  3. National Science Foundation
  4. Alfred P. Sloan Foundation
  5. US Department of Energy Office of Science
  6. NASA

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In this study, observations with XMM-Newton in the field of the Sculptor dwarf spheroidal galaxy were analysed to classify the X-ray sources. The results revealed the presence of numerous background X-ray sources and identified stars, galaxies, and candidates within this galaxy.
We analysed observations with XMM-Newton in the field of the Sculptor dwarf spheroidal galaxy (dSph). The aim of the study was the classification of X-ray binaries and accreting white dwarfs belonging to the Sculptor dSph. Using different methods of X-ray timing and spectral analyses, together with an extensive multiwavelength study of the optical and infrared counterparts of the X-ray sources, we classified the sources detected with XMM-Newton in the field of the Sculptor dSph. The long-term variability of the sources has been studied over two XMM-Newton observations. None of the members of the Sculptor dSph show significant long-term variability over these two observations. We also searched for periodicity and pulsation using the Lomb-Scargle and Rayleigh Z(n)(2), techniques. No signals of pulsation or periodicity have been found for the X-ray sources. The results show the presence of a noticeable number of background X-ray sources in the field of this galaxy. We classified 43 sources as active galactic nuclei, galaxies, and galaxy candidates. Three Galactic foreground stars have been identified in the field of the Sculptor dSph, and one of them is an M-dwarf candidate. Moreover, we classified four symbiotic-star candidates and three quiescent low-mass X-ray binary candidates in the Sculptor dSph. The luminosity of these X-ray sources is similar to 10(33-35) erg s(-1).

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