J/ApJ/756/52     R-band light curve of QSO J0158-4325 images     (Morgan+, 2012)
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Further evidence that quasar X-ray emitting regions are compact: X-ray and
optical microlensing in the lensed quasar Q J0158-4325.
    Morgan C.W., Hainline L.J., Chen B., Tewes M., Kochanek C.S., Dai X.,
    Kozlowski S., Blackburne J.A., Mosquera A.M., Chartas G., Courbin F.,
    Meylan G.
   <Astrophys. J., 756, 52 (2012)>
   =2012ApJ...756...52M    (SIMBAD/NED BibCode)
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ADC_Keywords: QSOs ; Gravitational lensing ; Photometry, RI ; X-ray sources
Keywords: accretion, accretion disks; cosmology: observations; dark matter;
          gravitational lensing: micro; gravitational lensing: strong;
          quasars: general

Abstract:
    We present four new seasons of optical monitoring data and six epochs
    of X-ray photometry for the doubly imaged lensed quasar Q J0158-4325.
    The high-amplitude, short-period microlensing variability for which
    this system is known has historically precluded a time delay
    measurement by conventional methods. We attempt to circumvent this
    limitation by the application of a Monte Carlo microlensing analysis
    technique, but we are only able to prove that the delay must have the
    expected sign (image A leads image B). Despite our failure to robustly
    measure the time delay, we successfully model the microlensing at
    optical and X-ray wavelengths to find a half-light radius for soft
    X-ray emission log (r_1/2,X,soft_/cm)=14.3^+0.4^_-0.5_, an upper limit
    on the half-light radius for hard X-ray emission log
    (r_1/2,X,hard_/cm)<=14.6, and a refined estimate of the
    inclination-corrected scale radius of the optical R-band (rest frame
    3100{AA}) continuum emission region of log (r_s_/cm)=15.6+/-0.3.

Description:
    We imaged the doubly lensed quasar Q J0158-4325 (Morgan et al.
    1999AJ....118.1444M) in X-rays using the ACIS imaging spectrometer on
    the Chandra X-Ray Observatory (Chandra) on six occasions between 2009
    November 6 and 2010 October 6. These observations were a component of
    a larger Chandra Cycle 11 monitoring program, the details of which are
    published in Chen et al. (2012ApJ...755...24C).

    We have monitored Q J0158-4325 for eight seasons in the R band using
    the SMARTS 1.3m telescope with the ANDICAM optical/infrared camera and
    using the 1.2m Euler Swiss Telescope as a part of the COSMOGRAIL
    project.

    The astrometry of the lens components is held fixed to the values
    measured in Hubble Space Telescope H-band images from the CfA-Arizona
    Space Telescope Lens Survey (CASTLES), the details of which were
    published in Morgan et al. (2008ApJ...676...80M).

Objects:
    ---------------------------------------------------------
       RA   (2000)    DE        Designation(s)
    ---------------------------------------------------------
    01 58 41.40   -43 25 03.8   Q J0158-4325 = QSO J0158-4325
    ---------------------------------------------------------

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
table1.dat        46      226   Q J0158-4325 light curves
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See also:
  VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
  J/A+A/553/A121 : 2 lensed quasars light curves (Eulaers+, 2013)
  J/A+A/551/A104 : Lensed QSO UM673/Q0142-100 VRi light curves (Ricci+, 2013)
  J/A+A/536/A53  : R-band light curves of HE 0435-1223 (Courbin+, 2011)
  J/ApJ/679/1144 : Galaxy clusters in LOS to background QSOs. I. (Lopez+, 2008)
  J/ApJ/660/146  : HE 1104-1805 differential light curves (Poindexter+, 2007)
  http://www.cosmograil.org/ : COSMOSGRAIL project home page
  http://www.cfa.harvard.edu/castles/ : CASTLES survey home page

Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label    Explanations
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   1-  8 F8.3   d       HJD      Heliocentric Julian Date; HJD-2450000
  10- 13 F4.2   arcsec  Seeing   [0.9/2.1] Seeing
  15- 19 F5.3   mag     QSOAmag  [1.6/1.9] QSO A magnitude in R-band (1)
  21- 25 F5.3   mag   e_QSOAmag  [0.005/0.03] Uncertainty in QSOAmag
      26 A1     ---   f_QSOAmag  Flag on QSOAmag (2)
  28- 32 F5.3   mag     QSOBmag  [2.4/3] QSO B magnitude in R-band (1)
  34- 38 F5.3   mag   e_QSOBmag  [0.01/0.07] Uncertainty in QSOBmag
      39 A1     ---   f_QSOBmag  Uncertainty in QSOBmag (2)
  41- 46 A6     ---     Tel      Source of the observation (3)
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Note (1): The QSO A and B columns give the magnitudes of the quasar images
          relative to the comparison stars.
Note (2):
    ) = Seeing was FWHM{>=}2.0" and photometry was not used in the analysis.
Note (3): Instrument as follows:
    Euler = 1.2m Euler Swiss Telescope.
   SMARTS = 1.3m telescope with the ANDICAM optical/infrared camera.
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History:
    From electronic version of the journal

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(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    20-Mar-2014
