2024ApJ...961..178C -
Astrophys. J., 961, 178 (2024/February-1)
Exploring X-Ray Properties of Low-metallicity Dwarf Galaxies.
CANN J.M., WEAVER K.A., PFEIFLE R.W., SECREST N.J., SATYAPAL S. and GLIOZZI M.
Abstract (from CDS):
One of the primary outstanding questions in extragalactic astronomy is the formation and early evolution of the supermassive black holes that are seen in nearly every massive galaxy. Low-metallicity dwarf galaxies may offer the most representative local analogs to pristine early galaxies, making them a vital tool in probing black hole seed models through the study of the intermediate-mass black holes (IMBHs) possibly hosted therein; though these dwarf galaxies, and the IMBHs they may host, are typically not as well-studied in this context as their higher-metallicity and higher-mass counterparts. In this paper, we explore the X-ray properties of a sample of 37 low-metallicity dwarf galaxies using archival XMM observations, and we compare the properties of this population against a representative sample of higher-metallicity counterparts. We report the detection of 10 sources with 0.3-10 keV luminosity in excess of 1040 erg s–1 within the low-metallicity sample, which we highlight for followup as potential IMBH candidates. Finally, we discuss the differing multiwavelength scaling relations (e.g., LX-LW2, LX-star formation rate) between the two galaxy populations, as well as the sample's LX as a function of metallicity.
Abstract Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
Dwarf galaxies - X-ray astronomy
Simbad objects:
38
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