Journal
ASTRONOMY & ASTROPHYSICS
Volume 406, Issue 2, Pages L27-L31Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20030785
Keywords
galaxies : distances and redshifts; galaxies : photometry; galaxies : starburst
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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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