2001A&A...373...38B


Query : 2001A&A...373...38B

2001A&A...373...38B - Astronomy and Astrophysics, volume 373, 38-55 (2001/7-1)

A QSO survey via optical variability and zero proper motion in the M 92 field. I. QSO candidates and selection effects.

BRUNZENDORF J. and MEUSINGER H.

Abstract (from CDS):

The combination of variability and proper motion constraints (VPM search) is believed to provide an unconventional yet efficient search strategy for QSOs with selection effects quite different from conventional optical QSO surveys. Previous studies in a field of high galactic latitude have shown that the VPM method is indeed an efficient search strategy. In the present paper, we describe a further variability-proper motion (VPM) QSO survey on Tautenburg Schmidt plates. The survey is based on an exceptionally large number of 162 B plates centred on M 92 with a time-baseline of more than three decades. Further U and V plates are used to measure time-averaged colour indices, and morphology is evaluated on a deep R plate. Proper motions with Hipparcos-like accuracies as well as variability indices are derived for about 35000 star-like objects down to B=20.5. With regard to both the number of plates and the number of objects to be investigated, this is the largest VPM survey performed so far. The present paper is focused on the description of the observational material, the data reduction, the definition of the selection parameters, and the construction of the QSO candidate sample. Furthermore, the selection effects of the VPM-method are discussed a priori. For the present survey, the selection effects are shown to be dominated by the magnitude-dependence of the photometric accuracy. Down to the limiting magnitude of the survey Blim=19.7, we identify 62 high-priority QSO candidates and a further 57 candidates of medium priority. Spectroscopic follow-up observations have been performed for all these candidates as well as for additional selected candidates of lower priority; the confirmed QSOs will be presented and discussed in a forthcoming paper.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - galaxies: statistics - quasars: general - globular clusters: individual: M 92

CDS comments: par. 4.3 : FIRST J1709+4201 incomplete format: FIRST J171356.1+421808.

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2481 0
2 6C 170732+420542 Sy1 17 09 06.1086949848 +42 01 57.267510672     18.40     ~ 13 1
3 NGC 6323 GiG 17 13 18.0454114728 +43 46 56.772281424   14.8       ~ 93 1
4 [VV2000] J171356.1+421808 QSO 17 13 56.1504459408 +42 18 08.547828768   23.19 21.12     ~ 11 0
5 2MASS J17150311+4429519 Sy1 17 15 03.1105166496 +44 29 51.942641676   16.8 16.8     ~ 10 0
6 QSO B1715+4316 QSO 17 17 00.6061076112 +43 13 30.254516256   21.00 20.0     ~ 8 0
7 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2119 0
8 2MASX J17182095+4249142 Sy1 17 18 20.9253471096 +42 49 14.037853512     17.77     ~ 8 0
9 RX J1719.5+4245 X 17 19 36.0 +42 45 18           ~ 5 0
10 Z 226-6 AG? 17 21 20.896 +43 52 23.92   15.1       ~ 8 0
11 RX J1722.0+4315 Sy1 17 22 01.91688 +43 15 24.1056           ~ 30 0

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