37 GHz observations of a large sample of BL Lacertae objects

Details 37 GHz observations of a large sample of BL Lacertae objects 37 GHz observations of a large sample of BL Lacertae objects

2007-05-07

arxiv.org/abs/0705.0887v1

Astron.J.133:1947-1953,2007

Astronomy and Astrophysics

Astrophysics

12 pages, 5 figures + 5 tables. Published in Astronomical Journal

Scientific paper

10.1086/512609

We present 37 GHz data obtained at Metsahovi Radio Observatory in 2001 December - 2005 April for a large sample of BL Lacertae objects. We also report the mean variability indices and radio spectral indices in frequency intervals 5 - 37 GHz and 37 - 90 GHz. Approximately 34 % of the sample was detected at 37 GHz, 136 BL Lacertae objects in all. A large majority of the detected sources were low-energy BL Lacs (LBLs). The variability index values of the sample were diverse, the mean fractional variability of the sample being \Delta S_2 = 0.31. The spectral indices also varied widely, but the average radio spectrum of the sample sources is flat. Our observations show that many of the high-energy BL Lacs (HBL), which are usually considered radio-quiet, can at times be detected at 37 GHz.

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