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arXiv:astro-ph/0403119 (astro-ph)
[Submitted on 4 Mar 2004]

Title:Radio spectra of a sample of X-ray selected BL Lacs

Authors:Francesca Cavallotti (1), Anna Wolter (1), John T. Stocke (2), Travis Rector (3) ((1) Osservatorio Astronomico di Brera, Milano, Italy, (2) Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, USA, (3) University of Alaska, Anchorage, USA)
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Abstract: We present simultaneous multifrequency radio observations for a complete subsample of 26 XBLs from the Einstein Extended Medium-Sensitivity Survey, obtained with the Very Large Array (VLA). Spectra are computed using fluxes at 20, 6 and 3.6 cm. Unlike many radio selected samples, the EMSS did not impose any criterion on the radio spectrum to identify BL Lac objects. It is therefore possible to investigate the intrinsic radio spectral slope distribution and to determine the effect produced by this selection criterion. We find that 15% of the observed objects do not meet the flat-spectrum criterion imposed on some other BL Lac samples. A dataset that includes non-simultaneous data (that are also taken with different VLA configurations) shows an even higher percentage of steep spectrum sources. This effect can be ascribed to a larger fraction of extended flux detected with the more compact VLA this http URL biases introduced by the flat--radio-spectrum criterion in the radio-selected BL Lac samples cannot explain the discrepancies observed in the evolutionary properties of Radio and X-ray selected samples of BL Lacs.
Comments: 9 pages, 5 figures, to be published in Astronomy and Astrophysics
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0403119
  (or arXiv:astro-ph/0403119v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0403119
Journal reference: Astron.Astrophys. 419 (2004) 459-467
Related DOI: https://doi.org/10.1051/0004-6361%3A20034320

Submission history

From: Francesca Cavallotti [view email]
[v1] Thu, 4 Mar 2004 13:15:26 UTC (34 KB)
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