Volume 396, Number 3, December IV 2002
|Page(s)||787 - 792|
|Section||Cosmology (including clusters of galaxies)|
|Published online||05 December 2002|
BL Lac identification for the ultraluminous X-ray source observed in the direction of NGC 4698
Istituto di Astrofisica Spaziale e Fisica Cosmica (IASF–CNR) – Sezione di Bologna (Formerly Istituto TeSRE – CNR.) , via Gobetti 101, 40129, Bologna, Italy
2 The Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA
3 Department of Astronomy, University of California, Berkeley, CA 94720, USA
Corresponding author: L. Foschini, firstname.lastname@example.org
Accepted: 20 September 2002
We report the identification of the optical and radio counterparts of the ultraluminous X-ray (ULX) source XMMU J124825.9+083020 (NGC 4698-ULX1). The optical spectrum taken with the VLT yields a redshift of , which implies that the ULX is not associated with the nearby galaxy NGC 4698. The spectral energy distribution calculated from the available data indicates that the source is likely to be a BL Lac object. The possible synchrotron peak at X-ray energies suggests that this source may be a γ-ray emitter.
Key words: galaxies: active / galaxies: Seyfert / galaxies: BL Lacertae objects: general
© ESO, 2002
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