J/A+A/392/851 QSOs in the M3 field (Meusinger+, 2002)
QSOs from the variability and proper motion survey in the M3 field.
Meusinger H., Scholz R.-D., Irwin M., Lehmann H.
<Astron. Astrophys. 392, 851 (2002)>
=2002A&A...392..851M 2002A&A...392..851M
ADC_Keywords: Active gal. nuclei ; Galaxies, Seyfert ; QSOs ; Photometry, UBV ;
Redshifts
Keywords: galaxies: active - galaxies: Seyfert - galaxies: statistics -
quasars: general
Abstract:
We present results from a variability and proper motion (VPM) search
for QSOs in the field around M3. The VPM search is demonstrated to be
powerful technique for efficiently finding QSOs without major
selection effects with regard to the spectral energy distribution.
Remarkably, the properties of the VPM QSOs do not significantly differ
from those of samples from more conventional optical search
techniques. The lightcurves of the QSOs from the resulting sample
provide an interesting data set for the statistical investigation of
QSO long-term variability.
Description:
Two lists are presented for altogether 181 QSOs/Sey1s/NELGs in a field
of about 10 square degrees centered on the globular cluster M3. All
listed objects were unambiguously identified with starlike sources
from a variability and proper motion (VPM) study based on a large
number of digitised plates from the Tautenburg Schmidt telescope with
a time-baseline of three decades. The first list summarises the data
for 74 QSOs/Sey1s and 3 Narow Emission Line Galaxies (NELGs) with
redshifts from spectroscopic follow-up observations with CAFOS at the
2.2m telescope of the DSAZ on Calar Alto, Spain. The data for the
remaining sources, with redshifts taken from the NED, are given in the
second table.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 96 77 QSOs/Sey1s/NELGs from follow-up spectroscopy
of VPM sources
table4.dat 96 104 QSOs/Sey1s/NELGs from the NED
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Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Running number
6- 7 I2 h RAh Right ascension (J2000.0)
9- 10 I2 min RAm Right ascension (J2000.0)
12- 16 F5.2 s RAs Right ascension (J2000.0)
19- 20 I2 deg DEd Declination (J2000.0)
22- 23 I2 arcmin DEm Declination (J2000.0)
25- 28 F4.1 arcsec DEs Declination (J2000.0)
32- 36 F5.3 --- z Redshift
37 A1 --- u_z Uncertainty flag on z
40 I1 --- Run ? Observing run for follow-up spectroscopy,
in table3.dat only
44- 49 F6.2 mag BMAG Absolute B magnitude
51- 54 A4 --- Type Object type
57- 61 F5.2 mag Bmag Apparent B magnitude
64- 68 F5.2 mag U-B ? Colour index U-B (1)
71- 75 F5.2 mag B-V ? Colour index B-V (2)
79- 82 F4.2 --- Ipm Proper motion index (3)
85- 88 F4.2 --- Ivar Overall variability index (4)
92- 96 F5.2 --- Iltvar ? Long-term variability index (5)
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Note (1): U magnitude not available for line 28 in table3.dat
Note (2): V magnitude not available for line 1 in table4.dat
Note (3): The proper motion index is the probability of an object to have
a non-zero proper motion, and is expressed by the measured proper
motion in units of the proper motion error (Ipm=pm/e_pm).
(Brunzendorf & Meusinger, 2001A&A...373...38B 2001A&A...373...38B)
Note (4): The overall variability index is assessed by the deviation of
the individual magnitudes about the mean magnitude, and is normalised
by the average magnitude scatter for star-like objects in the same
magnitude range.
Note (5): The long-term variability index is defined by means of structure
function analysis.
Iltvar not available for lines 15 and 28 in table3.dat
Iltvar has been computed only for B<20 and Ipm<4 and is
therefore not available for several objects in table4.dat
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Acknowledgements: Helmut Meusinger
(End) Helmut Meusinger [TLS Tautenburg, Germany] 05-Jul-2002