Radio Detection of 18 Rass BL Lac Objects

Abstract

We present the radio detection of 18 BL Lac objects from our survey of over 575 square degrees of sky. These 18 objects are located within 20 arcsec of the X-ray position, of which 11 have a measured red-shift. All candidates are radio emitters above ~1 mJy and fall within the range of existing samples on the two colour, alpha_ro vs alpha_ox, diagram with a transitional population of three (3) evident. Two unusual sources have been identified, a candidate radio quiet BL Lac, RX J0140.9-4130, and an extreme HBL, RX J0109.9-4020, with Log(nu_peak)~19.2. The BL Lac Log(N)-Log(S) relation is consistent with other samples and indicates the ROSAT All Sky Survey (RASS) could contain (2000+-400) BL Lac objects.

14 pages, 6 figures, accepted for publication in Serbian Astronomical Journal

References in corpus (11)

• SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue
• Spectral energy distributions of a large sample of BL Lacertae objects
• The Properties of the Radio-Selected 1Jy Sample of BL Lacertae Objects
• Optically identified BL Lacertae objects from the Sloan Digital Sky Survey
• A Large, Uniform Sample of X-ray Emitting AGN from the ROSAT All-Sky and Sloan Digital Sky Surveys: the Data Release 5 Sample
• The classification of BL Lacertae objects: the Ca H&K break
• A Large Sample of BL Lacs from SDSS and FIRST
• The HRX-BL Lac sample - evolution of BL Lac objects
• The Radio Structure of High-Energy Peaked BL Lacertae Objects
• The debeamed luminosity, sychrotron peak frequency and black hole mass of BL Lac objects
• The 2dF BL Lac Survey

Cited by in corpus (3)

• Photohadronic origin of $\gamma$-ray BL Lac emission: implications for IceCube neutrinos
• Spectroscopy of High Energy BL Lac Objects with X-shooter on the VLT
• Very high energy $\gamma$-ray emission from RBS 0679