Radio Detection of 18 Rass BL Lac Objects
  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.
