The Formation History of Andromeda's Extended Metal-Poor Halo
We propose deep ACS imaging in the outer spheroid of the Andromeda galaxy, in order to measure the star formation history of its true halo. For the past 20 years, nearly all studies of the Andromeda "halo" were focused on the spheroid within 30 kpc of the galaxy's center, a region now known to host significant substructure and populations with high metallicity and intermediate ages. However, two groups have recently discovered an extended metal-poor halo beyond 30 kpc; this population is distinct in its surface-brightness profile, abundance distribution, and kinematics. In earlier cycles, we obtained deep images of the inner spheroid (11 kpc on the minor axis), outer disk (25 kpc on the major axis), and giant tidal stream, yielding the complete star formation history in each field. We now propose deep ACS imaging of 4 fields bracketing this 30 kpc transition point in the spheroid, so that the inner spheroid and the extended halo populations can be disentangled, enabling a reconstruction of the star formation history in the halo. A wide age distribution in the halo, as found in the inner spheroid, would imply the halo was assembled through ongoing accretion of satellite galaxies, while a uniformly old population would be a strong indication that the halo was formed during the early rapid collapse of the Andromeda proto-galaxy.
We propose to image four M31 halo fields with the F606W (broad V)
and F814W (I) filters on the ACS/WFC. Each field can be at any
orientation, but all exposures in a field must be at the same
orientation. The F606W and F814W filters are the most efficient for
observing faint stars, and are the same used in our Cycle 11 and Cycle
13 programs, which include observations of fiducial Galactic star
clusters (Brown et al. 2005). Our science goals require a CMD with
SNR=5 at a point 0.8 mag below the oldest MSTO. We have verified
the time to reach this depth via analysis of our previous programs,
extensive simulations, and the ACS ETC.
Scheduling our program should not be a problem. The STScI Large
Programs web site shows a visibility of 51 min for the Andromeda
declination, and there are many days exceeding 51 min of visibility
from July through mid-January, which is when the Sun angle exceeds
90 degrees (as needed to decrease the background for deep HST
images). Our 22 kpc field has 5 windows with high visibility, with
durations of 17 days, 3 days, 31 days, 4 days, and 8 days. Our 35 kpc
fields have 4 windows with high visibility, with durations of 17 days,
33 days, 4 days, and 4 days. It is likely that one of our fields
would execute in the 17 day window (averaging 1.9 orbits/day) while
the other three would execute in the 33 day window (for 2.9
orbits/day). Although the images of each field will be summed for the
primary science, the individual images enable time-series
photometry on RR Lyrae and other variables, providing
additional population constraints (Brown et al. 2004a).
***NOTE*** To the extent possible, the visits should either be
scheduled randomly or in something like the sequence given by the
visit numbers. In one of our previous deep programs, the visits (as
numbered) alternated between F606W and F814W exposures, with identical
exposure times in either type of visit, yet somehow the visits were
mostly scheduled in a large block of F606W and then a large block of
F814W. Biased scheduling of the filters hampers the search for some
classes of transient phenomena, so it is best if the distribution of
filters is either random or follows something like the alternating
sequence given in this Phase II.
RESOLVED STELLAR POPULATIONS
12
false
0
0.0
false
0
false
false
false
true
SUPPORTED
GALAXY
SPIRAL
HALO
M31-22KPC
J2000
00 49 13.4700
+40 10 18.90
J2000
GALAXY
HALO
SPIRAL
M31-35KPCA
J2000
00 53 19.7900
+39 46 10.50
J2000
GALAXY
HALO
SPIRAL
M31-KPCB
J2000
00 53 48.2300
+39 42 8.90
J2000
GALAXY
HALO
SPIRAL
M31-KPCC
J2000
00 54 16.6600
+39 38 7.40
J2000
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F814W
Note that the scheduling window of mid-July to mid-January was explained and justified in our Phase I proposal. This window ensures that the Sun angle will be greater than 90 degrees. As the Sun angle drops below 90 degrees, the sky background increases significantly, which would reduce the depth attained in the CMDs.
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2
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Note that the scheduling window of mid-July to mid-January was explained and justified in our Phase I proposal. This window ensures that the Sun angle will be greater than 90 degrees. As the Sun angle drops below 90 degrees, the sky background increases significantly, which would reduce the depth attained in the CMDs.
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false
2
0
Note that the scheduling window of mid-July to mid-January was explained and justified in our Phase I proposal. This window ensures that the Sun angle will be greater than 90 degrees. As the Sun angle drops below 90 degrees, the sky background increases significantly, which would reduce the depth attained in the CMDs.
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