J/A+A/300/323 NOT GL survey of multiply imaged quasars (Jaunsen+, 1995)
The NOT gravitational lens survey for multiply imaged quasars
JAUNSEN A.O., JABLONSKI M., PETTERSEN B.R., STABELL R.
<Astron. Astrophys. 300, 323 (1995)>
=1995A&A...300..323J 1995A&A...300..323J (SIMBAD/NED BibCode)
ADC_Keywords: QSOs; Gravitational lensing; Photometry; Colors; Spectroscopy;
Redshifts
Keywords: cosmology: gravitational lensing -
large-scale structure of the Universe -
dark matter - quasars: general
Description:
A gravitational lens (GL)-search program, initiated in 1990 at the
Nordic Optcal Telescope (NOT), has revealed several possible
GL-candidates among a sample of 168 quasars (QSOs), chosen from three
lists compiled by C. Hazard, D. Reimers and J. Surdej, respectively.
Some of these candidates, selected for having close companions (within
5 arcseconds), were imaged in several filters and their colours
compared. Low dispersion spectra of the most promising candidates were
also obtained at the NOT and ESO New Technology Telescope (NTT). None
of these has proved to be strong candidates of gravitational lensing
effects. We present this new sample of QSOs and combine it with
previously published optical QSO samples in a statistical analysis to
yield constraints on flat cosmologies and galaxy velocity dispersions.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 77 168 The complete observational list of the 168 QSOs
in the NOT sample
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 13 A13 --- QSO QSO identification, where the first letter(s)
indicates the origin:
H: from Hazard,
HS: from Reimers (Hamburg Sternwarte)
others from the Veron catalogue
16- 17 I2 h RAh Right ascension 1950
18- 19 I2 min RAm Right ascension 1950
20- 24 F5.2 s RAs Right ascension 1950
26 A1 --- DE- Declination sign
27- 28 I2 deg DEd Declination 1950
29- 30 I2 arcmin DEm Declination 1950
31- 34 F4.1 arcsec DEs Declination 1950
37 A1 --- Filter [IRV] Filter types
41- 44 F4.2 arcsec FWHM Seeing (FWHM)
47- 51 F5.3 --- z Redshift z of the QSO
54- 58 F5.2 mag Vmag V-band magnitude of the QSO as estimated from
our data or tabulated in other QSO catalogues.
The QSOs with no previously measured magnitude
were estimated by comparing them to QSOs on
other CCD frames (for a similar exposure time)
These estimated magnitudes are marked by an
asterisk (*) and have errors up to ± 0.5 mag
60- 64 F5.2 mag Dmag []? Magnitude difference between closest
companion with weaker apparent brightness
and within 5 arcsec of QSO
66- 69 F4.1 arcsec Sep []? Separation of closest companion with
weaker apparent brightness and within
5 arcsec of QSO
72 I1 --- GLc See Note (1)
76- 77 A2 --- Note See Note (2)
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Note (1): 1 indicates that the QSO is treated as a possible GL candidate while
2 indicates that the object is elongated, diffuse or otherwise
especially interesting. The latter objects are not treated as GL
candidates in the present analysis, but should be further analysed in
future work.
Note (2): 1 indicates that there are one or more PSFs and the QSO is not
elongated
2 indicates that the QSO appears elongated (this is sometimes due
3 indicates that there are no PSFs other than the QSO in the image
to bad tracking)
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(End) Patricia Bauer [CDS] 17-Feb-1995