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Issue A&A
Volume 406, Number 2, August I 2003
Page(s) L27 - L31
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20030785



A&A 406, L27-L31 (2003)
DOI: 10.1051/0004-6361:20030785

Letter

Yet another galaxy identification for an ultraluminous X-ray source

N. Masetti1, L. Foschini1, 2, L. C. Ho3, M. Dadina1, G. Di Cocco1, G. Malaguti1 and E. Palazzi1

1  Istituto di Astrofisica Spaziale e Fisica Cosmica - Sezione di Bologna, CNR, via Gobetti 101, 40129, Bologna, Italy
2  INTEGRAL Science Data Centre, Chemin d'Ecogia 16, 1290 Versoix, Switzerland
3  The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA

(Received 23 April 2003 / Accepted 22 May 2003 )

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.


Key words: galaxies: distances and redshifts -- galaxies: photometry -- galaxies: starburst

Offprint request: N. Masetti, masetti@bo.iasf.cnr.it

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© ESO 2003


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