HIGHLY VARIABLE OBJECTS IN THE PALOMAR-QUEST SURVEY: A BLAZAR SEARCH USING OPTICAL VARIABILITY

Journal Article · Sun Nov 01 04:00:00 EST 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/705/1/46· OSTI ID:21378420

Bauer, Anne; Baltay, Charles; Coppi, Paolo; Ellman, Nancy; Glikman, Eilat; Jerke, Jonathan; Rabinowitz, David; Scalzo, Richard ^[1]; Donalek, Ciro; Drake, Andrew; Djorgovski, S G; Graham, Matthew; Mahabal, Ashish; Williams, Roy ^[2]

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1. Yale University, Department of Physics, P.O. Box 208120, New Haven, CT 06520-8120 (United States)
2. California Institute of Technology, Department of Astronomy, MC 105-24, 1200 East California Blvd, Pasadena, CA 91125 (United States)

We identify 3113 highly variable objects in 7200 deg{sup 2} of the Palomar-QUEST (PQ) Survey, which each varied by more than 0.4 mag simultaneously in two broadband optical filters on timescales from hours to roughly 3.5 years. The primary goal of the selection is to find blazars by their well-known violent optical variability. Because most known blazars have been found in radio and/or X-ray wavelengths, a sample discovered through optical variability may have very different selection effects, elucidating the range of behavior possible in these systems. A set of blazars selected in this unusual manner will improve our understanding of the physics behind this extremely variable and diverse class of active galactic nucleus (AGN). The object positions, variability statistics, and color information are available using the PQ CasJobs server. The time domain is just beginning to be explored over large sky areas; we do not know exactly what a violently variable sample will hold. About 20% of the sample has been classified in the literature; over 70% of those objects are known or likely AGNs. The remainder largely consists of a variety of variable stars, including a number of RR Lyrae and cataclysmic variables.

• OSTI ID: 21378420
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 705; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BL LACERTAE OBJECTS
CATALOGS
COLOR
COSMIC RADIO SOURCES
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
FILTERS
GALAXIES
IONIZING RADIATIONS
MATHEMATICS
OPTICAL FILTERS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
QUASARS
RADIATIONS
STARS
STATISTICS
VARIABLE STARS
X RADIATION