Through a Lens, Darkly - New Constraints on the Fundamental Components of the Cosmos
As the most massive objects in the universe, galaxy clusters represent important signposts in our story of structure evolution, and are the ultimate telescopic lenses, placing gravitationally lensed galaxies from the earliest epochs in comfortable reach for careful study. We take full advantage of the refurbished ACS and WFC3 cameras to deliver deep 14-filter images of 25 carefully chosen clusters. These will enable us to address timely and substantive questions about dark matter, dark energy, and galaxy evolution well beyond z=7. These X-ray clusters are chosen to be free of lensing bias and to span a wide range of redshift and mass. By combining strong and weak lensing, we will obtain the definitive mass profile of relaxed clusters to confront the distinctive prediction of the standard LambdaCDM model. Detailed maps of internal structure will be enabled by ~1,000 new multiply-imaged lensed sources to AB=26, all with precise (2% x (1+z)) photometric redshift measurements, thanks to WFC3's UV and IR coverage. A supernovae search in parallel (with low magnification uncertainties) will extend the Hubble diagram of SN1a to z>1.5, testing the constancy of dark energy with time and probing progenitor evolution. Our homogeneous panchromatic deep imaging of this cluster sample will constitute a vast legacy archive for studies of the formation and evolution of structure.
There are two special requirements: orientation and cadence. Four epochs must be executed at the same orientation. Each epoch will be between 10 and 14 days, depending on the roll angle availability for the given target. There will be two orientations selected, which will be approximately 20-30 degrees apart.
COSMOLOGY
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false
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SUPPORTED
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
HIGH REDSHIFT CLUSTER
J2000
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
HIGH REDSHIFT CLUSTER
J2000
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
HIGH REDSHIFT CLUSTER
J2000
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
HIGH REDSHIFT CLUSTER
J2000
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
HIGH REDSHIFT CLUSTER
J2000
J2000
WFC3/UVIS
Imaging
No
No
F225W
ACS/WFC
Imaging
No
No
F775W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F850LP
WFC3/IR
Imaging
No
No
F105W
WFC3/IR
Imaging
No
No
F110W
WFC3/UVIS
Imaging
No
No
F336W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F850LP
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F850LP
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Imaging
No
No
F160W
ACS/WFC
Imaging
No
No
F775W
ACS/WFC
Imaging
No
No
F850LP
WFC3/IR
Imaging
No
No
F125W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F390W
ACS/WFC
Imaging
No
No
F475W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F850LP
WFC3/IR
Imaging
No
No
F125W
WFC3/UVIS
Imaging
No
No
F225W
WFC3/UVIS
Imaging
No
No
F275W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F850LP
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F850LP
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Imaging
No
No
F160W
ACS/WFC
Imaging
No
No
F775W
ACS/WFC
Imaging
No
No
F850LP
WFC3/IR
Imaging
No
No
F125W
WFC3/IR
Imaging
No
No
F160W
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(Tic-Visit
:proposal-id 12460
:visit-id "B7"
:proposal-version -1
:trans-version "20110825"
:date "11-Nov-2011 15:49:15.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1965328
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12460
:visit-id "B7"
:obset-id "B7"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12460
:visit-id "B7"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2819
:al-overhead-at-end 116
:internal-dur-at-end 950
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3152
:pcs-gap 0
)
true
1
0
Timing link suitability includes constraints ([Sequence (B7 B8) within 0.1 days])
Same orient constraint links visits (B0 B1 B3 B5 B6 B7 B8)
The scheduling data was generated by CASM 19.3.
CASM was run in Phase II mode.
Visits B7-B8 represent epoch 4 (at orient 2) and should be taken concurrently
1332061815000
127.0
(Tic-Visit
:proposal-id 12460
:visit-id "B8"
:proposal-version -1
:trans-version "20110825"
:date "11-Nov-2011 15:53:05.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "30"
:si-bright-earth-limb-angle 20.0
:data-volume 2030432
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12460
:visit-id "B8"
:obset-id "B8"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12460
:visit-id "B8"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2819
:al-overhead-at-end 0
:internal-dur-at-end 1003
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3152
:pcs-gap 0
)
true
1
0