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Dage, Kristen C; Vowell, Noah; Thygesen, Erica; Bahramian, Arash; Haggard, Daryl; Kovlakas, Konstantinos; Kundu, Arunav; Maccarone, Thomas J; Strader, Jay; Urquhart, Ryan; Zepf, Stephen E
Monthly notices of the Royal Astronomical Society, 12/2021, Letnik: 508, Številka: 3Journal Article
ABSTRACT We investigate a sample of seven edge-on spiral galaxies using Chandra observations. Edge-on spiral galaxies allow us to clearly separate source associated with their star-forming regions versus the outer edges of the system, offering a clear advantage over other systems. We uncover a number of X-ray point sources across these galaxies, and after eliminating contaminating foreground and background sources, we identify 12 candidate ultraluminous X-ray sources (ULXs). All of these sources are projected on to the central regions, implying that the majority of ULXs in this sample of spiral galaxies are disc/bulge, and thus not halo sources. This also includes two transient ULXs, which may be long-duration transients and low-mass X-ray binaries. This finding illustrates the need for further studies of transient ULXs.
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