期刊
ASTRONOMICAL JOURNAL
卷 133, 期 5, 页码 1947-1953出版社
UNIV CHICAGO PRESS
DOI: 10.1086/512609
关键词
BL Lacertae objects : general; galaxies : active; radio continuum : galaxies
We present 37 GHz data obtained at Metsahovi Radio Observatory from 2001 December to 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 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 Lac objects. 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 Lac objects, which are usually considered radio-quiet, can at times be detected at 37 GHz.
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