J/ApJ/789/125 Light curves of the quasar He 0435-1223 (Blackburne+, 2014)
The optical, ultraviolet, and X-ray structure of the quasar He 0435-1223.
Blackburne J.A., Kochanek C.S., Chen B., Dai X., Chartas G.
<Astrophys. J., 789, 125 (2014)>
=2014ApJ...789..125B 2014ApJ...789..125B (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Magnitudes ; Gravitational lensing
Keywords: accretion, accretion disks - gravitational lensing: micro -
quasars: individual: HE 0435-1223
Abstract:
Microlensing has proved an effective probe of the structure of the
innermost regions of quasars and an important test of accretion disk
models. We present light curves of the lensed quasar HE 0435-1223 in
the R band and in the ultraviolet (UV), and consider them together
with X-ray light curves in two energy bands that are presented in a
companion paper. Using a Bayesian Monte Carlo method, we constrain the
size of the accretion disk in the rest-frame near- and far-UV, and
constrain for the first time the size of the X-ray emission regions in
two X-ray energy bands. The R-band scale size of the accretion disk is
about 1015.23 cm (∼23rg), slightly smaller than previous
estimates, but larger than would be predicted from the quasar flux. In
the UV, the source size is weakly constrained, with a strong prior
dependence. The UV to R-band size ratio is consistent with the thin
disk model prediction, with large error bars. In soft and hard X-rays,
the source size is smaller than ∼1014.8 cm (∼10rg) at 95%
confidence. We do not find evidence of structure in the X-ray emission
region, as the most likely value for the ratio of the hard X-ray size
to the soft X-ray size is unity. Finally, we find that the most likely
value for the mean mass of stars in the lens galaxy is ∼0.3 M☉,
consistent with other studies.
Description:
We use eight seasons of optical R-band photometry resulting from an
ongoing monitoring campaign using A Novel Double Imaging Camera (DePoy
et al. 2003SPIE.4841..827D 2003SPIE.4841..827D) on the Small and Moderate Aperture
Research Telescope System 1.3 m telescope. The magnitudes of the four
images of HE 0435 have been monitored since 2003 August in the R band
(rest frame 2417 Å, with a cadence varying from one day to about
a week. An automated pipeline subtracts instrumental bias and
flat-fields the images in the standard way. Three to six images are
obtained per epoch, and we combine them to increase the signal to
noise ratio and reject cosmic rays. We measure the fluxes of the
quasar images and the lens galaxy using the point spread function
(PSF) fitting method described in detail by Kochanek et al.
(2006ApJ...640...47K 2006ApJ...640...47K).
Objects:
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RA (ICRS) DE Designation
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04 38 14.8 -12 17 15 HE 0435-1223 = HE 0435-1223
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 403 R-band Light Curves
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See also:
J/A+A/455/L1 : Variability of 5 gravitationally lensed QSOs (Paraficz+, 2006)
J/AJ/135/1384 : R-band variability in 5 blazars (Gupta+, 2008)
J/A+A/499/395 : R magnitudes of 5 double QSOs (Paraficz+, 2009)
J/A+A/536/A53 : R-band light curves of HE 0435-1223 (Courbin+, 2011)
J/A+A/544/A51 : R-band photometry of the lensed quasar UM673
(Koptelova+, 2012)
J/ApJ/756/52 : R-band light curve of QSO J0158-4325 images (Morgan+, 2012)
J/A+A/553/A121 : 2 lensed quasars light curves (Eulaers+, 2013)
J/A+A/556/A22 : R-band light curves of RX J1131-1231 (Tewes+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d HJD Heliocentric Julian Date
13- 17 F5.3 mag RmagA R band magnitude for image A
19- 23 F5.3 mag e_RmagA Uncertainty in Rmag-A
25- 29 F5.3 mag RmagB R band magnitude for image B
31- 35 F5.3 mag e_RmagB Uncertainty in Rmag-B
37- 41 F5.3 mag RmagC R band magnitude for image C
43- 47 F5.3 mag e_RmagC Uncertainty in Rmag-C
49- 53 F5.3 mag RmagD R band magnitude for image D
55- 59 F5.3 mag e_RmagD Uncertainty in Rmag-D
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 09-Mar-2017