A QSO survey via optical variability and zero proper motion in the M92 field. V. Completion of the QSO sample

Details A QSO survey via optical variability and zero proper motion in the M92 field. V. Completion of the QSO sample A QSO survey via optical variability and zero proper motion in the M92 field. V. Completion of the QSO sample

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003an....324..474m&link_type=abstract

Astronomische Nachrichten, Vol. 324, No. 5, p. 474-484

Statistics

4

Galaxies: Active, Galaxies: Seyfert, Galaxies: Statistics, Quasars: General

Scientific paper

We present results from the spectroscopic follow-up observation of additional QSO candidates in the variability and proper motion (VPM) survey field around M 92. In the previous studies, the VPM survey has shown to be an efficient way to select QSOs; the QSO sample was confined to the magnitude range B <≈ 19.8 with a completeness estimated to ˜ 90% for B <≈ 19.5. Here we study the faint end (B>19.8) of the candidate list and check the completeness of the brighter (B<19.7) QSO subsample. We first study an additional 34 brighter QSO candidates selected by FOCA UV brightness, radio detection, or optical colours. Only one new QSO was found. We show that a two-colour search making use of FOCA 2,000 Å magnitudes efficiently selects QSOs, Seyfert galaxies, and NELGs. However, there is no QSO found from this method which would not have been selected by the VPM method as well. The main aim of this paper is to identify the VPM QSO candidates with 19.8

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