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Seoul National University Bright Quasar Survey in Optical (SNUQSO) I: First Phase Observations and Results
Journal article   Open access

Seoul National University Bright Quasar Survey in Optical (SNUQSO) I: First Phase Observations and Results

Induk Lee, Myungshin Im, Minjin Kim, Eugene Kang, Hyunjin Shim, Gordon T Richards, Alastair C Edge, Myung Gyoon Lee, Changbom Park and Myeong-Gu Park
The Astrophysical journal. Supplement series, v 175(1), pp 116-127
04 Mar 2008
DOI: https://doi.org/10.1086/523043
url
https://doi.org/10.1086/523043View
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Abstract

Physics - Cosmology and Nongalactic Astrophysics Physics - Earth and Planetary Astrophysics Physics - Instrumentation and Methods for Astrophysics Physics - High Energy Astrophysical Phenomena Physics - Solar and Stellar Astrophysics Physics - Astrophysics of Galaxies
Astrophys.J.Suppl.175:116,2008 We present results from the first phase of the Seoul National University Bright Quasar Survey in Optical (SNUQSO) as well as its basic observational setup. Previous and current large-area surveys have been successful in identifying many quasars, but they could have missed bright quasars due to their survey design. In order to help complete the census of bright quasars, we have performed spectroscopic observations of new bright quasar candidates selected from various methods based on optical colors, near-infrared colors, radio, and X-ray data. In 2005/2006, we observed 55 bright quasar candidates using the Bohyunsan Optical Echelle Spectrograph (BOES) on the 1.8 m telescope at the Bohyunsan Optical Astronomy Observatory in Korea. We identify 14 quasars/Seyferts from our observation, including an optically bright quasar with i=14.98 mag at z=0.092 (SDSS J003236.59-091026.2). Non-quasar/Seyfert objects are found to be mostly stars, among which there are five M-type stars and one cataclysmic variable. Our result shows that there still exist bright quasars to be discovered. However, at the same time, we conclude that finding new bright quasars in high Galactic latitude regions is very challenging and that the existing compilation of optically bright quasars is nearly complete in the northern hemisphere.

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