Assigned ID: 697
----- Attempting Submission 1 (Fri Feb 24 20:58:16 GMT 2012) -----
HST Phase I Proposal 697 (diskprop.apt) successfully submitted.
Resubmission (Dec 10 2012) to correct a small mistake regarding targets in Visit 08.
----- Attempting Submission 1 (Sun Jul 15 14:01:33 GMT 2012) -----
HST Phase II Proposal 13018 (diskprop.apt) successfully submitted.
----- Attempting Submission 2 (Mon Dec 10 13:01:08 GMT 2012) -----
Deciphering the Assembly History of Galactic Disks: The Resolved Record in the Outer Disk of M31
Disk galaxies account for a sizeable fraction of the stellar mass in the Universe yet the details of their formation and evolution are poorly understood. Measurements of the radial star formation and chemical enrichment histories across disks provide key constraints on models and are made with the highest precision in nearby systems where stellar populations can be resolved into individual stars. In a previous cycle, we obtained deep HST/ACS observations of a field at 26 kpc in M31’s outer disk which we have used to reconstruct the star formation history back to early epochs. Our results are fascinating -- star formation at this location proceeded at a near constant rate until 5 Gyr ago when there was a rapid decline in activity followed by a short intense burst. This burst, centered at 2 Gyr, created ~25% of the stellar mass and coincides with a sharp drop in metallicity, highly suggestive of the inflow of metal-poor gas. Dynamical models of the M31-M33 interaction favour ~2-3 Gyr ago as the last pericentric passage, when the systems were within ~50 kpc of each other. In order to firmly establish the role this interaction played in triggering star formation in M31’s outer disk, we request similar depth observations at two additional locations in order to determine if the behaviour derived from this single field is globally representative. Additionally, these pointings will span a considerable baseline over which to examine radial gradients in the old (> 5 Gyr) populations and, when combined with extant Keck radial velocities, will provide an exquisite dataset with which to test ideas about radial migration and disk galaxy assembly.
We will obtain deep CMDs at two locations (~20 and 23 kpc) in the outer disk of M31. We will image in the broad-V (F606W) and I (F814W) filters. Our goal is to reach 10 Gyr main sequence turn-off stars with [Fe/H]=-0.7 and E(B-V)=0.06 at the M31 distance (783 kpc); this requires V=29 with S/N>=8 and can be achieved with 6 orbits with F606W and 7 orbits with F814W. Visits comprise either 3 orbits in F606W or F814W, or 4 orbts in F814W. Exposures have small dithers in order to aid removal of CRs and hot pixels. Parallel exposures are obtained with WFC3/UVIS in F606W and F814W.
RESOLVED STELLAR POPULATIONS
12
false
0.0
0.0
false
false
false
false
SUPPORTED
GALAXY
DISK
SPIRAL
J2000
J2000
V-I=1.0+/-0.5
GALAXY
DISK
SPIRAL
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J2000
V-I=1.0+/-0.5
ACS/WFC
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No
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F814W
ACS/WFC
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No
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F606W
ACS/WFC
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No
F814W
ACS/WFC
Imaging
No
No
F606W
WFC3/UVIS
Imaging
No
No
F814W
WFC3/UVIS
Imaging
No
No
F606W
WFC3/UVIS
Imaging
No
No
F814W
WFC3/UVIS
Imaging
No
No
F606W
POS-TARG
DITHER
0.265
LINE
0.187
false
false
69.05
4
20.67
ACS-WFC-DITHER-BOX
1
false
POS-TARG
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LINE
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false
2
34.13
ACS-WFC-DITHER-LINE
2
false
POS-TARG
DITHER
DITHER
2
0.138
ACS-WFC-DITHER-LINE
false
false
0.145
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32.99
POS-TARG
ACS-WFC-DITHER-LINE
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