A Large Homogeneous Sample of BL Lacs from SDSS and FIRST

Details A Large Homogeneous Sample of BL Lacs from SDSS and FIRST A Large Homogeneous Sample of BL Lacs from SDSS and FIRST

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0814p&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #08.14; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

The BL Lac phenomenon is often interpreted as arising from (FR I) radio jets viewed along the line of sight, resulting in multiwavelength emission, variability, polarization, and nearly featureless optical spectra. Historically, radio-selected BL Lac samples have tended to favor objects whose synchrotron emission peaks at low frequencies, while X-ray selected samples tended to favor high peak frequency objects. But recent large BL Lac samples are helping ameliorate some of these selection biases. We have thus searched the SDSS (DR5) data for objects with approximately featureless optical spectra that match to FIRST radio sources, and thereby identify/recover over 600 radio-emitting BL Lac candidates, one of the largest homogeneous samples to date; about 1/3 are also detected as X-ray sources in ROSAT. Half our objects have reasonably secure redshifts from weak host galaxy features which, along with proper motion information, confirm the extragalactic nature of the bulk of our candidates. Our large SDSS/FIRST sample supports suggestions of a smooth distribution of properties among various BL Lac sub-populations. This work is supported by NASA/ADP grant NNG05GC45G.

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