Journal Article

<i>Chandra</i> observations of the ULX N10 in the Cartwheel galaxy

Fabio Pizzolato, Anna Wolter and Ginevra Trinchieri

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 2, pages 1116-1124
Published in print August 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2010.16735.x
Chandra observations of the ULX N10 in the Cartwheel galaxy

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The Cartwheel galaxy harbours more ultraluminous X-ray sources (ULXs) than any other galaxy observed so far, and as such it is a particularly interesting target to study them. In this paper, we analyse the three Chandra observations of the brightest ULX (N10) in the Cartwheel galaxy, in light of current theoretical models suggested to explain such still elusive objects. For each model, we derive the relevant spectral parameters. Based on self-consistency arguments, we can interpret N10 as an accreting binary system powered by an ∼ 100 M black hole. A young supernova strongly interacting with its surroundings is a likely alternative that can be discarded only with the evidence of a flux increase from future observations.

Keywords: accretion, accretion discs; galaxies: individual: Cartwheel; X-rays: binaries; X-rays: galaxies

Journal Article.  6509 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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