Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-22
Astron.J.129:2542-2561,2005
Astronomy and Astrophysics
Astrophysics
42 pages, 11 figures (4 in color), uses aastex.cls. To appear in the June 2005 edition of AJ. Full tables are temporarily avai
Scientific paper
10.1086/430216
We present a sample of 386 BL Lacertae (BL Lac) candidates identified from 2860 deg^2 of the Sloan Digital Sky Survey (SDSS) spectroscopic database. The candidates are primarily selected to have quasi-featureless optical spectra and low proper motions as measured from SDSS and USNO-B positions; however, our ability to separate Galactic from extragalactic quasi-featureless objects (QFOs) on the basis of proper motion alone is limited by the lack of reliable proper motion measurements for faint objects. Fortunately, high proper motion QFOs, mostly DC white dwarfs, populate a well defined region of color space, approximately corresponding to blackbodies with temperatures in the range 7000-12000 K. QFOs with measurable redshifts or X-ray or radio counterparts (i.e., evidence of an extragalactic/AGN nature) loosely follow a track in color space that corresponds to power-law continua plus host galaxy starlight, with typical power-law slopes in the range 1
Anderson Scott F.
Brinkmann John
Collinge Matthew J.
Hall Patrick B.
Harris Hugh C.
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