Yet another galaxy identification for an ultraluminous X-ray source

Abstract

We report on the identification of the optical and infrared counterparts of the ultraluminous X-ray source (ULX) XMMU J121214.5+131248 (NGC4168-ULX1). The optical spectrum yields a redshift of z=0.217, which implies that the ULX is not associated with the nearby galaxy NGC 4168, but rather with a background object. Optical spectral line ratios and the spectral energy distribution constructed from the available data indicate that the source is likely a starburst nucleus.

5 pages, 3 figures, 1 table, accepted for publication on A&A Letters

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• Intermediate Mass Black Holes in Accreting Binaries: Formation, Evolution and Observational Appearance
• Optical Counterparts of Ultra Luminous X-ray Sources
• Optical Counterparts of Ultraluminous X-Ray Sources
• The Ultraluminous X-ray Sources near the Center of M82
• X-ray and optical variability of the ultraluminous X-ray source NGC 1313 X-2
• VLT Observations of the Ultraluminous X-ray Source NGC 1313 X-2
• A second glance at SN 2002ap and the M74 field with XMM-Newton
• An Off-Nucleus Nonstellar Black Hole in the Seyfert Galaxy NGC 5252
• The Nature of Ultra Luminous X-ray Sources
• Have we detected the most luminous ULX so far?
• The application of slim disk models to ULX: the case of M33 X-8
• Optical Counterparts of Two Candidate Ultraluminous X-ray Sources in NGC 4536