Spectroscopy Of Variability-selected Sources From The Palomar-quest Survey

Details Spectroscopy Of Variability-selected Sources From The Palomar-quest Survey Spectroscopy Of Variability-selected Sources From The Palomar-quest Survey

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4617d&link_type=abstract

American Astronomical Society, AAS Meeting #211, #46.17; Bulletin of the American Astronomical Society, Vol. 39, p.803

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the results of a spectroscopic follow-up of highly variable and transient sources discovered in the Palomar-Quest (PQ) digital synoptic sky survey. The sources are selected using two different procedures: as the most variable objects at high Galactic latitudes found through an archival analysis of the PQ data; and as highly variable or transient sources detected by the real-time processing pipeline. Both are using the drift scan data alone, but the light curves are being supplemented by the large body of point-and-stare data in hand. Sources selected in the archival search are a mixture of AGN and CVs; only about 10% of them are present in NED, and only about a half of those have available redshifts. Sources with radio and/or X-ray counterparts listed in NED are invariably AGN. Sources found with the real-time processing pipeline are mostly a mix of AGN (blazars in particular, judging by the featureless blue continuum spectra) and SNe. Detections of blazars on the basis of optical variability alone are particularly interesting, as they are complementary to the more traditional radio-based selection methods, especially in the view of the upcoming studies with GLAST. This work is a part of a systematic exploratory approach to the characterization of time-variable sky at moderately faint light levels (down to about 20th mag) and over very wide areas, with a relevance for for the future synoptic sky surveys.

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