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Assigned ID: 205
----- Attempting Submission 1 (Thu Apr 06 09:27:36 GMT 2017) -----
HST Phase I Proposal 205 (z3passive_cycle22.apt) successfully submitted.
Receipt: # 205-1
----- Attempting Submission 2 (Fri Apr 07 10:17:44 GMT 2017) -----
ORIENT RANGE update for visit 10, as requested for scheduling
This is a fairly strightforward program doing G141 slitless spectroscopy with some imaging in support
of the spectroscopy but also important in itself to study morphology of the targets.
As specified in the proposal, we have constrained ORIENTs minimizing contamination on the spectra
from sources in the field. This is still allowing fairly large observing windows for some targets, but a couple
of targets have small visibility range.
If scheduling should reveal to be too problematic we could try loosen the ORIENT constraints on these 2,
at the expenses of accepting substantially larger contamination. For the moment we tried to optimize
science being conservative on the ORIENT range.
-311093371
----- Attempting Submission 1 (Tue Jul 18 15:45:39 GMT 2017) -----
----- Attempting Submission 2 (Tue Oct 31 15:08:23 GMT 2017) -----
Spectroscopic redshifts and age dating of a first statistical sample of passive galaxies at z~3
Ultradeep WFC3/G141 observations from one of our past HST programs allowed us to confirm the redshift and measure the age of a quiescent galaxy at z=3. This unique object was found inside a single WFC3 pointing (4 sq. arcmin) suggesting that massive old galaxies even at z~3 are more common than previously thought. The strong correlation observed between evolved stellar populations and a bulge-dominated morphology at least up to z~2 may also imply that the Hubble sequence comes into place at very early times. Guided by the properties of this spectroscopically confirmed z=3 passive galaxy, we have identified a substantial sample of 2.5<z<3.5 passive candidates over the full COSMOS field, selecting the brightest, most massive and most secure targets for which sufficient S/N on the continuum can be obtained in ~2 orbits with WFC3/G141 grism spectroscopy. We request here a total of 17 orbits to observe a sample of 10 passive galaxies at z>2.5, to detect their 4000A breaks and measure precise redshifts, confirming their identification as distant, quiescent systems (as opposed to dusty star-forming sources), and measuring their stellar ages as well as sizes from the WFC3/F140 ancillary imaging. We have verified that no object of this kind, bright enough to be confirmed spectroscopically, can be found inside existing WFC3 spectroscopy in the CANDELS fields, and that this science cannot be competitively done from the ground. These new observations will push the constraints on the evolution, nature and abundance of passive galaxies to the highest redshifts, and will allow a first detailed picture of the early assembly of the Hubble sequence.
This program is observing 10 targets, z~2.5-3 passive galaxy candidates.
For each of them, we start with short imaging exposures in F140W, followed by a grism G141 series of exposures.
Depending on the target, we observe for either one or two orbits.
Galaxies and the IGM
Cosmology
6
false
false
false
false
false
false
SUPPORTED
GALAXY
ELLIPTICAL
HIGH REDSHIFT GALAXY
J2000
J2000
zp=2.6 logM=11.0
GALAXY
ELLIPTICAL
HIGH REDSHIFT GALAXY
J2000
J2000
zp=2.7 logM=11.2
GALAXY
ELLIPTICAL
HIGH REDSHIFT GALAXY
J2000
J2000
zp=2.8 logM=11.0
GALAXY
ELLIPTICAL
HIGH REDSHIFT GALAXY
J2000
J2000
zp=3.2 logM=10.7
GALAXY
ELLIPTICAL
HIGH REDSHIFT GALAXY
J2000
J2000
zp=2.5 logM=10.9
GALAXY
ELLIPTICAL
HIGH REDSHIFT GALAXY
J2000
J2000
zp=2.6 logM=10.9
GALAXY
ELLIPTICAL
HIGH REDSHIFT GALAXY
J2000
J2000
zp=2.6 logM=11.4
GALAXY
ELLIPTICAL
HIGH REDSHIFT GALAXY
J2000
J2000
zp=2.8 logM=11.0
GALAXY
ELLIPTICAL
HIGH REDSHIFT GALAXY
J2000
J2000
zp=2.6 logM=11.1
GALAXY
ELLIPTICAL
HIGH REDSHIFT GALAXY
J2000
J2000
zp=2.5 logM=11.0
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Spectroscopic
No
No
G141
POS-TARG
DITHER
0.605
LINE
false
false
3
41.788
WFC3-IR-DITHER-LINE-3PT
1
false
POS-TARG
DITHER
DITHER
4
5.183
WFC3-IR-DITHER-BOX-MIN
false
74.653
true
0.365
0.572
5
41.859
POS-TARG
WFC3-IR-DITHER-BLOB
18.528
2
false
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