----- Attempting Submission 1 (Mon Apr 09 11:43:59 GMT 2007) -----
Some observations are proposed for Cycle 17 beyond they limits of the visit planner. However,
they simply replicate observations/cadences from the previous year which were schedulable.
Assigned ID: 1039
----- Attempting Submission 1 (Sat Feb 03 13:51:54 GMT 2007) -----
The Wavelength Dependence of Accretion Disk Structure
We can now routinely measure the size of quasar accretion disks
using gravitational microlensing of lensed quasars. The next
step to testing accretion disk models is to measure the size
of accretion disks as a function of wavelength, particularly
at the UV and X-ray wavelengths that should probe the inner,
strong gravity regime. Here we focus on two four-image quasar
lenses that already have optical (R band) and X-ray size
measurements using microlensing. We will combine the
HST observations with ground-based monitoring to measure the
disk size as a function of wavelength from the near-IR to the UV.
We require HST to measure the image flux ratios in the ultraviolet
continuum near the Lyman limit of the quasars.
The selected targets have estimated black hole masses
that differ by an order of magnitude, and we should find wavelength
scalings for the two systems that are very different because
the Blue/UV wavelengths should correspond to parts of the disk
near the inner edge for the high mass system but not in the
low mass system. The results will be modeled using a combination
of simple thin disk models and complete relativistic disk models.
While requiring only 18 orbits, success for one system requires
observations in both Cycles 16 and 17.
We will be monitoring two gravitational lenses with the SBC/F165LP. The epochs should be spaced to span the visibility periods with roughly equal time periods
between the observations. The visibility periods are May-September for Q2237 and December-March for RXJ1131. There are a further 6 epochs approved
for Q2237 in Cycle 17, but not scheduled here.
The observations themselves are simple single orbit, 4 position dithered SBC/F165LP observations. We have one such image of RXJ1131 already, and the
results are as expected.
AGN/QUASARS
12
false
0
0.0
false
false
false
false
false
false
SUPPORTED
GALAXY
GRAVITATIONAL LENS
J2000
22 40 30.3400
+03 21 28.80
J2000
GALAXY
ACCRETION DISK
GRAVITATIONAL LENS
J2000
11 31 51.6000
-12 31 57.00
J2000
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
ACS/SBC
Imaging
No
No
F165LP
POS-TARG
DITHER
0.179
LINE
0.116
false
false
63.650002
4
20.02
ACS-SBC-DITHER-BOX
1
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