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J/A+A/455/L1      Variability of 5 gravitationally lensed QSOs (Paraficz+, 2006)
Microlensing variability in time-delay quasars.
    Paraficz D., Hjorth J., Burud I., Jakobsson P., Eliasdottir A.
   <Astron. Astrophys. 455, L1 (2006)>
   =2006A&A...455L...1P
ADC_Keywords: QSOs ; Gravitational lensing ; Photometry

Keywords: gravitational lensing


Abstract:
    We have searched for microlensing variability in the light curves of
    five gravitationally lensed quasars with well-determined time delays:
    SBS 1520+530, FBQ 0951+2635, RX J0911+0551, B1600+434 and HE
    2149-2745. By comparing the light curve of the leading image with a
    suitably time offset light curve of a trailing image we find that two
    (SBS 1520+530 and FBQ 0951+2635) out of the five quasars have
    significant long-term (∼ years) and short-term (∼100-days) brightness
    variations that may be attributed to microlensing. The short-term
    variations may be due to nanolenses 10-4-10-3M☉,
    relativistic hot or cold spots in the quasar accretion disks, or
    coherent microlensing at large optical depth.

Description:
    Photometric parameters for five gravitationally lensed quasars
    obtained at the Nordic Optical Telescope: SBS 1520+530, FBQ 0951+2635,
    RXJ 0911+0551, B1600+434, HE 2149-2745 are presented. For each quasar
    image magnitudes and magnitude error are given.
Objects:
    -------------------------------------------------------------------------
       RA   (2000)   DE     Designation(s)                  (file)
    -------------------------------------------------------------------------
    21 52 07.5   -27 31 50  HE 2149-2745 = QSO B2149-2745   (table[34])
    09 11 27.5   +05 50 52  RX J0911+0551 = QSO J0911+0551  (table5.dat)
    15 21 44.8   +52 54 49  SBS 1520+530 = QSO B1520+530    (table6.dat)
    16 01 40.5   +43 16 47  B1600+434 = QSO B1600+4344      (table7.dat)
    09 51 22.5   +26 35 14  FBQ 0951+2635 = FBQS J0951+2635 (table8.dat)
    -------------------------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat        78       40   Phototmetric parameters for two image of quasar
                              HE 2149-2745 in I-band
table4.dat        78       57   Phototmetric parameters for two image of quasar
                              HE 2149-2745 in V-band
table5.dat        78       74   Phototmetric parameters for two image of quasar
                              RX J0911+0551 in I-band
table6.dat        78       58   Phototmetric parameters for two image of quasar
                              SBS 1520+530 in R-band
table7.dat        78       41   Phototmetric parameters for two image of quasar
                              B1600+434 in I-band
table8.dat       112       58   Phototmetric parameters for two image of quasar
                              FBQ 0951+2635 in R-band


See also:
 J/A+A/391/481 : R-band photometry of SBS1520+530 (Burud+, 2002)
 J/A+A/420/447 : VRI photometry of lensed quasar QSO B2237+0305 (Vakulik+, 2004)
 J/ApJ/409/28  : Gravitationally Lensed Quasars (Maoz + 1993)


Byte-by-byte Description of file: table[3-7].dat

   Bytes Format  Units   Label     Explanations

   1- 13  A13    ---     QSO       QSO name
      15  A1     ---     Band      [IVR] Photometric band
  17- 27  F11.8  mag     magA      Differential magnitude of A component
  29- 40  F12.10 mag     e_magA    Error on magA
  42- 52  F11.8  mag     magB      Differential magnitude of B component
  55- 66  F12.10 mag     e_magB    Error on magB
  69- 78  F10.2  d       JD        Julian date


Byte-by-byte Description of file: table8.dat

   Bytes Format Units   Label     Explanations

   1- 13  A13   ---     QSO       QSO name
      15  A1    ---     Band      [R] Photometric band
  17- 25  F9.6  mag     magA      Magnitude of A component
  28- 36  F9.6  mag     magB      Magnitude of B component
  39- 47  F9.7  mag     e_magA    Magnitude error of A component
  49- 57  F9.7  mag     e_magB    Magnitude error of B component
  59- 67  F9.6  mag     mag1      Magnitude of reference star
  69- 79  F11.9 mag     e_mag1    Magnitude error of reference star
  81- 89  F9.6  mag     mag2      Magnitude of reference star
  91-101  F11.9 mag     e_mag2    Magnitude error of reference star
 103-112  F10.2 d       JD        Julian date


Acknowledgements: Danka Paraficz, danka(at)not.iac.es


References:
    Burud et al.,     HE 2149-2745    2002A&A...383...71B
    Hjorth et al.,    RX J0911.4+0551 2002ApJ...572L..11H
    Burud et al.,     SBS 1520+530    2002A&A...391..481B, Cat. J/A+A/391/481
    Burud et al.,     B1600+434       2000ApJ...544..117B
    Jakobsson et al., FBQ 0951+2635   2005A&A...431..103J
(End)                                        Patricia Vannier [CDS]  24-Apr-2006