English

Resolving the X-ray emission from the Lyman continuum emitting galaxy Tol 1247-232

High Energy Astrophysical Phenomena 2017-08-30 v1 Astrophysics of Galaxies

Abstract

Chandra observations of the nearby, Lyman-continuum (LyC) emitting galaxy Tol 1247-232 resolve the X-ray emission and show that it is dominated by a point-like source with a hard spectrum (Γ=1.6±0.5\Gamma = 1.6 \pm 0.5) and a high luminosity ((9±2)×1040ergs1(9 \pm 2) \times 10^{40} \rm \, erg \, s^{-1}). Comparison with an earlier XMM-Newton observation shows flux variation of a factor of 2. Hence the X-ray emission likely arises from an accreting X-ray source: a low-luminosity AGN or one or a few X-ray binaries. The Chandra X-ray source is similar to the point-like, hard spectrum (Γ=1.2±0.2\Gamma = 1.2 \pm 0.2), high luminosity (1041ergs110^{41} \rm \, erg \, s^{-1}) source seen in Haro 11, which is the only other confirmed LyC-emitting galaxy that has been resolved in X-rays. We discuss the possibility that accreting X-ray sources contribute to LyC escape.

Keywords

Cite

@article{arxiv.1708.05074,
  title  = {Resolving the X-ray emission from the Lyman continuum emitting galaxy Tol 1247-232},
  author = {P. Kaaret and M. Brorby and L. Casella and A. H. Prestwich},
  journal= {arXiv preprint arXiv:1708.05074},
  year   = {2017}
}

Comments

6 pages, accepted for MNRAS