Version 1.
1322905221
Assigned ID: 1672
----- Attempting Submission 1 (Fri Mar 01 19:27:34 GMT 2013) -----
Version 1 of what we think is the finished phase II observing plan.
-1012287006
----- Attempting Submission 1 (Thu Jun 20 18:37:05 GMT 2013) -----
Resolving the Reddest Extragalactic Sources Discovered by Spitzer: Strange Dust-Enshrouded Objects at z~2-3?
We request 14 orbits with WFC3/IR to spatially resolve a sample of extraordinary objects that are ultraluminous in the mid-infrared (24 microns), but were undetected at all other Spitzer, optical, or near-infrared survey wavelengths. Found in the widest of the extragalactic areal surveys (SWIRE; 50 square degrees) these are the only such objects found by Spitzer. Followup infrared spectroscopy centered on the 24-micron band of three objects indicates that they lie between redshifts of 2-3. Additional ultradeep imaging of the entire sample with Spitzer and Keck has added photometric datapoints at 2.2 and 3.6 microns. Combined with the photometric upper limits, the resulting spectral energy distributions (SEDs) are not compatible with that of any known class of objects, although several lines of evidence point towards unusual, highly-obscured AGN, possibly undergoing fueling before the host galaxy has been fully established. The deep Keck imaging cannot achieve sufficient S/N to resolve the objects, but at least demonstrates that they can be observed with HST.
Due to their unusual SEDs, in most cases the sum total of our knowledge about these objects amounts to three photometric datapoints and some upper limits. The WFC3 imaging will add our only information about their structure, size, and shape. This in turn will allow us to differentiate between several proposed models shaping the SED.
Deep imaging (1 orbit/target) at H-band (F160W) of ultra-red compast objects. A 6-point parallelogram dither pattern is used, sampling the integer, 1/2 integer, and 1/3 integer pixel phases. In most visits a seventh short exposure is added at the center of the parallelogram in order to fill in unused visibility. In several instances roll constraints have been added in order to keep bright (10th mag) stars off the detector.
No realtime.
No calibration observation.
UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE
12
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SUPPORTED
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
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J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
UNIDENTIFIED
INFRARED EMITTER
J2000
J2000
H=23, V is upperlimit
WFC3/IR
Imaging
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F160W
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No
F160W
WFC3/IR
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Imaging
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WFC3/IR
Imaging
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F160W
WFC3/IR
Imaging
No
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F160W
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