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J/MNRAS/356/331  QSO-candidates in OGLE-II Galactic bulge fields   (Sumi+, 2005)
Variability-selected QSO candidates in OGLE-II Galactic bulge fields.
    Sumi T., Wozniak P.R., Eyer L., Dobrzycki A., Udalski A., Szymanski M.K.,
    Kubiak M., Pietrzynski G., Soszynski I., Zebrun K., Szewczyk O.,
    Wyrzykowski L.
   <Mon. Not. R. Astron. Soc., 356, 331-335 (2005)>
   =2005MNRAS.356..331S
ADC_Keywords: QSOs ; Photometry, CCD

Keywords: stars: variables: other - Galaxy: bulge - Galaxy: centre -
          quasars: general

Abstract:
    We present 97 QSO candidates in 48 Galactic bulge fields of the
    Optical Gravitational Lensing Experiment II (OGLE-II) covering
    ∼11deg2, which are selected via their variability. We extend light
    curves of variable objects which were detected in a 3-yr baseline in
    the OGLE-II variable star catalogue to fourth year. We search for
    objects that are faint (16<I0<18.5) and slowly variable over 4-yr in
    this catalogue by using the variogram/structure function. Finding the
    QSOs in such stellar-crowded and high extinction fields is
    challenging, but should be useful for the astrometric reference frame.
    Spectroscopic follow-up observations are required to confirm these QSO
    candidates. Follow-up observations are being prepared for four of
    these fields (BUL_SC1, 2, 32 and 45). Follow-up observations for other
    fields are strongly encouraged. The complete list and light curves of
    all 97 candidates are available in electronic format at
    http://www.astro.princeton.edu/sumi/QSO-OGLEII/ .

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table2.dat        89       97   The list of the 97 QSO candidates


See also:
 ftp://sirius.astrouw.edu.pl/ogle : OGLE DataBase
 http://www.astro.princeton.edu/~sumi/QSO-OGLEII : Home Page of the paper
 J/AcA/52/129 : DIA OGLE2 candidate variable stars catalog (Wozniak+ 2002)


Byte-by-byte Description of file: table2.dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     Field     Field number (field name is BUL_SC NN)
   4-  7  I4    ----    VID       Variable number, in the field (1)
  10- 15  I6    ---     ID        Identification number, in the field (2)
  17- 23  F7.2  pix     Xpos      X position
  25- 31  F7.2  pix     Ypos      Y position
  33- 34  I2    h       RAh       Right ascension (J2000)
  36- 37  I2    min     RAm       Right ascension (J2000)
  39- 43  F5.2  s       RAs       Right ascension (J2000)
      45  A1    ---     DE-       Declination sign (J2000)
  46- 47  I2    deg     DEd       Declination (J2000)
  49- 50  I2    arcmin  DEm       Declination (J2000)
  52- 55  F4.1  arcsec  DEs       Declination (J2000)
  58- 63  F6.3  mag     Imag      I magnitude
  65- 69  F5.3  mag     V-I       ?=9.999 V-I colour index
  71- 76  F6.3  mag     Icmag     ?=99.999 Extinction corrected I magnitude
  78- 83  F6.3  mag     (V-I)c    ?=9.999 Extinction corrected V-I colour index
  85- 89  F5.3  ---     Svar      Variogram slope (3)

Note (1): Numbering of Udalski et al, 2002, Cat. J/AcA/52/217,
          OGLEII DIA BUL-SCNN NNNN in Simbad
Note (2): OGLE BUL-SCNN NNNNNN in Simbad

Note (3): The larger Svar, the larger the variability on larger time-scales.



History:
  * 07-Feb-2006: Copied at http://www.astro.princeton.edu/~sumi/QSO-OGLEII
(End)                                      Patricia Vannier [CDS]    07-Feb-2006