Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-29
Mon.Not.Roy.Astron.Soc.352:903,2004
Astronomy and Astrophysics
Astrophysics
7 pages, 6 figures, accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2004.07980.x
High signal-to-noise spectroscopy has established a redshift of z=0.494 for the source 2QZJ215454.3-305654, originally selected from the 2dF/6dF QSO Redshift Surveys as one of 45 candidate BL Lac objects displaying a featureless continuum at optical wavelengths. Radio observations using the Australia Telescope Compact Array at 1.4 GHz place a 3\sigma upper limit on the object's radio flux density of approx 0.14mJy. The radio-to-optical flux ratio of this object is thus more than 7 times lower than the lowest such ratio observed in BL Lac objects. While the optical properties of 2QZJ215454.3-305654 are consistent with a BL Lac identification, the lack of radio and/or X-ray emission is not. It is uncertain whether this object is an AGN dominated by optical continuum emission from an accretion disk, or is similar to a BL Lac object with optical nonthermal emission from a relativistic jet.
Boyle Brian J.
Croom Scott M.
Heidt Jochen
Kedziora-Chudczer Lucyna
Londish Diana
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