Bright Quasar Survey at Low Galactic Latitude in the Southern Hemisphere

Details Bright Quasar Survey at Low Galactic Latitude in the Southern Hemisphere Bright Quasar Survey at Low Galactic Latitude in the Southern Hemisphere

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..544l&link_type=abstract

NOAO Proposal ID #2008A-0544

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Thanks to the recent large area surveys such as the Sloan Digital Sky Survey and the 2dF/6dF, the total number of known QSOs has dramatically increased to more than 100,000. However, we have not arrived yet at the complete census of QSOs. The area near the galactic plane still has not been explored thoroughly for QSOs. QSOs at low galactic latitude can have many astrophysical applications such as studying the galactic matter through absorption lines and serving as reference points for understanding the motion of galactic objects. However, the low galactic latitude region has been the place to avoid when searching for QSOs, since high number density of stars and high galactic extinction have hindered efficient identification of QSO candidates. Despite of these difficulties, we have recently discovered 75 bright QSOs/AGNs at low galactic latitude by selecting candidates using a method employing both NIR and radio data. Our QSO/AGN identification efficiency is found to be about 15-50%, depending on specific selection criteria, demonstrating that QSOs/AGNs can be discovered efficiently even at low galactic latitude. These success has been done in the northern hemisphere. Building up on our previous success, therefore, we propose to identify more low galactic latitude QSOs by extending the QSO survey region to the southern hemisphere. To identify QSOs spectroscopically, we will use the R-C spectrograph on the CTIO 1.5m telescope. From our observation, We expect that we will be able to get data from about 40% of Galactic plane which can be observed in the southern hemisphere, and has never been surveyed systematically.

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