Journal Article

A bright off-nuclear X-ray source: a type IIn supernova, a bright ULX or a recoiling supermassive black hole in CXO J122518.6+144545

P. G. Jonker, M. A. P. Torres, A. C. Fabian, M. Heida, G. Miniutti and D. Pooley

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 1, pages 645-650
Published in print September 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16943.x
A bright off-nuclear X-ray source: a type IIn supernova, a bright ULX or a recoiling supermassive black hole in CXO J122518.6+144545

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In this paper we report the discovery of CXO J122518.6+144545, a peculiar X-ray source with a position 3.6 ± 0.2 arcsec off-nuclear from a Sloan Digital Sky Survey Data Release 7 (SDSS DR7) z= 0.0447 galaxy. The 3.6 arcsec offset corresponds to 3.2 kpc at the distance of the galaxy. The 0.3–8 keV X-ray flux of this source is 5 × 10−14 erg cm−2 s−1 and its 0.3–8 keV luminosity is 2.2 × 1041 erg s−1 (2.7 × 1041 erg s−1; 0.5–10 keV) assuming that the source belongs to the associated galaxy. We find a candidate optical counterpart in archival Hubble Space Telescope/Advanced Camera for Surveys g′-band observations of the field containing the galaxy obtained on 2003 June 16. The observed magnitude of g′= 26.4 ± 0.1 corresponds to an absolute magnitude of −10.1. We discuss the possible nature of the X-ray source and its associated candidate optical counterpart and conclude that the source is either a very blue Type IIn supernova, an ultraluminous X-ray source with a very bright optical counterpart or a recoiling supermassive black hole.

Keywords: galaxies: individual: SDSS J122518.86+144547.7; X-rays: binaries; X-rays: individual: CXO J122518.6+144545

Journal Article.  4499 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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