Yet another galaxy identification for an ultraluminous X-ray source
N. Masetti, L. Foschini, L. C. Ho, M. Dadina, G. Di Cocco, G. Malaguti, E. Palazzi
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.
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