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J/A+A/300/323       NOT GL survey of multiply imaged quasars    (Jaunsen+, 1995)
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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      (SIMBAD/NED BibCode)
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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.dat         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.dat
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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