J/ApJ/756/52 R-band light curve of QSO J0158-4325 images (Morgan+, 2012)
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 2012ApJ...756...52M
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 (r1/2,X,soft/cm)=14.3+0.4-0.5, an upper limit
on the half-light radius for hard X-ray emission log
(r1/2,X,hard/cm)≤14.6, and a refined estimate of the
inclination-corrected scale radius of the optical R-band (rest frame
3100Å) continuum emission region of log (rs/cm)=15.6±0.3.
Description:
We imaged the doubly lensed quasar Q J0158-4325 (Morgan et al.
1999AJ....118.1444M 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 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 2008ApJ...676...80M).
Objects:
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RA (2000) DE Designation(s)
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01 58 41.40 -43 25 03.8 Q J0158-4325 = QSO J0158-4325
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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 magA [1.6/1.9] R-band magnitude of QSO image A (1)
21- 25 F5.3 mag e_magA [0.005/0.03] Uncertainty in magA
26 A1 --- u_magA [)] magA not used in the analysis (2)
28- 32 F5.3 mag magB [2.4/3.0] R-band magnitude of QSO image B (1)
34- 38 F5.3 mag e_magB [0.01/0.07] Uncertainty in magB
39 A1 --- u_magB [)] magB not used in the analysis (2)
41- 46 A6 --- Tel Source of the observation (3)
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Note (1): The magA and magB 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
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 20-Mar-2014