BL Lac Identification for the Ultraluminous X-ray Source Observed in the Direction of NGC 4698

Details BL Lac Identification for the Ultraluminous X-ray Source Observed in the Direction of NGC 4698 BL Lac Identification for the Ultraluminous X-ray Source Observed in the Direction of NGC 4698

2002-09-24

arxiv.org/abs/astro-ph/0209500v1

Astron.Astrophys. 396 (2002) 787

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures. Accepted for publication by Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20021391

We report the identification of the optical and radio counterparts of the ultraluminous X-ray (ULX) source XMMU J124825.9+083020 (NGC4698-ULX1). The optical spectrum taken with the VLT yields a redshift of z=0.43, which implies that the ULX is not associated with the nearby galaxy NGC4698. 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 gamma-ray emitter.

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