Discovery of multiple ultraluminous X-ray sources in the galaxy KUG 0214-057

Details Discovery of multiple ultraluminous X-ray sources in the galaxy KUG 0214-057 Discovery of multiple ultraluminous X-ray sources in the galaxy KUG 0214-057

2005-04-15

arxiv.org/abs/astro-ph/0504355v1

Astronomy and Astrophysics

Astrophysics

Accepted by A&A (6th April). 6 pages, 4 figures

Scientific paper

10.1051/0004-6361:20053060

We report the serendipitous discovery of several unresolved X-ray sources lying in the prominent spiral arms of the galaxy KUG 0214-057 in XMM-Newton observations. The location of these X-ray sources strongly suggests that at least three, and possibly four, of these may be physically related to the galaxy. The luminosity of each of these sources at the distance of KUG 0214-057 is > 5 x 10^39 erg/s (0.3-10 keV), making each a strong candidate ultraluminous X-ray source (ULX). Using the ULXs as a metric implies that this relatively low-mass galaxy may be experiencing rather intense starburst activity. The serendipitous discovery of these ULXs suggests that such objects are not a negligible component of the overall extragalactic X-ray source population.

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