SIMBAD references

2007AJ....133.1947N - Astron. J., 133, 1947-1953 (2007/May-0)

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

NIEPPOLA E., TORNIKOSKI M., LAHTEENMAKI A., VALTAOJA E., HAKALA T., HOVATTA T., KOTIRANTA M., NUMMILA S., OJALA T., PARVIAINEN M., RANTA M., SALORANTA P.-M., TORNIAINEN I. and TROLLER M.

Abstract (from CDS):

We present 37 GHz data obtained at Metsähovi 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 ΔS₂=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.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: BL Lacertae Objects: General - Galaxies: Active - Radio Continuum: Galaxies

VizieR on-line data: <Available at CDS (J/AJ/133/1947): table1.dat table2.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 12

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