Other
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3305p&link_type=abstract
American Astronomical Society, HEAD meeting #11, #33.05; Bulletin of the American Astronomical Society, Vol. 41, p.706
Other
Scientific paper
BL Lac objects are rare radio and X-ray emitting AGN unified with FR I radio galaxies with a jet pointed toward the observer. Recently, BL Lac samples from the SDSS have become large enough to reveal especially rare subclasses of AGN, in relatively large numbers, with weak-featured optical spectra that are also radio-quiet. For example, approximately 100 radio-quiet BL Lac candidates have been discovered at z<2.2. Here, we present follow-up Chandra X-ray imaging of a subset of SDSS radio-quiet BL Lac candidates. We also consider follow-up VLA radio observations and optical variability to help constrain the true nature of these peculiar objects. We conclude the SDSS has likely recovered at least two populations of weak-featured radio-quiet AGN. Some may be low-redshift analogs to weak line quasars, a class of high-redshift (z>2.2) AGN with unusually weak broad emission line regions, while others may indeed lie on the radio-faint tail of the much larger radio-loud BL Lac parent population.
Anderson Scott F.
Brandt Wiliam N.
Diamond-Stanic Aleksandar M.
Fan Xiaohui
Plotkin Richard M.
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