Very Young Globular Clusters in M31 ?
We propose to use HST's unique high spatial resolution imaging capabilities to conclusively confirm or refute the presence of alleged very young globular clusters in M31. Such young globular clusters with ages < 3 Gyr are not present in our galaxy, and, if real, would lead to a striking difference in the age distribution of the GCs between M31 and the Millky Way. If the apparent presence of very young globular clusters in M31 is confirmed through our proposed ACS imaging (now WFPC2 imaging) with HST, this would suggest major differences in the history of assembly of the two galaxies, with probable substantial late accretion into M31 which did not occur in our own galaxy.
Restricting ourselves to the prime range B-V < 0.7 mag requires acquiring
high spatial resolution of 41 candidate young GCs in M31. In our original phase II submission we
looked for pairs of candidates closer than 2 arcmin among these, and found several such cases.
However, the present submission represents a rework of the original one now that our program
has been shifted, following the failure of ACS, to imaging with WFPC2. This means
that we are now using a mode of 1 orbit/candidate with imaging in 2 filters
with WFPC2.
We select candidate young globular clusters in M31 more than 3 deg off the disk of
this galaxy and with integrated V < 17.5 mag as our targets. We use filters F450W
and F814W as they are broad band and efficient, hence short exposures will reach reasonable
depths, and the wide separation of the pair in wavelength will make the detection of the stellar
evolutionary isochrone sequence expected in these clusters easier. Furthermore,
F450W more or less corresponds to the standard Johnson B, while
F814W is a surrogate for an I filter. Thus comparison with the extensive grids of models and
existing ground based data will be straightforward, and we will at least be able to
establish the presence or absence of stars more luminous than the normal RGB tip.
Changing from ACS to WFPC2 imaging, we will use all of our 21 allocated orbits for
our short exposure survey of suspected very young GCs in M31. We use the planetary
camera (pointing origin at its center, i.e. PC1) for all exposures to maximize
the spatial resolution. The candidate young globular clusters have typical
sizes of 5 to 8 arcsec, so they will fit nicely within the PC chip of WFPC2.
We have no requirements regarding image orientation, so we expect that we are
not imposing any serious constraints on when image acquisition can occur.
Our targets are all within a small solid angle on the sky. Figure 2.2
of the HST Two-Gyro Handbook suggests that they will be accessible
more than 130 days/year.
UNRESOLVED STELLAR POPULATIONS
12
false
0.0
false
false
false
false
false
false
SUPPORTED
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 40 0.7800
+40 34 8.00
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 41 52.8400
+40 52 4.64
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 45 44.5200
+41 41 55.54
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 40 20.8100
+40 33 22.19
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 41 44.6000
+40 51 22.25
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 44 56.0000
+41 54 2.21
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 45 45.5700
+41 45 52.48
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 40 52.2800
+40 58 41.20
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 00 0.0000
+00 00 0.00
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 00 0.0000
+00 00 0.00
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 00 0.0000
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J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 00 0.0000
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J2000
STELLAR CLUSTER
GRAVITATIONAL LENS
J2000
00 00 0.0000
+00 00 0.00
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
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00 00 0.0000
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J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
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00 00 0.0000
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J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
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00 00 0.0000
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J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
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00 00 0.0000
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J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 00 0.0000
+00 00 0.00
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 00 0.0000
+00 00 0.00
J2000
STELLAR CLUSTER
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J2000
00 00 0.0000
+00 00 0.00
J2000
STELLAR CLUSTER
GLOBULAR CLUSTER
J2000
00 00 0.0000
+00 00 0.00
J2000
ACS/WFC
Imaging
No
No
F475W
ACS/WFC
Imaging
No
No
F775W
ACS/WFC
Imaging
No
No
F475W
ACS/WFC
Imaging
No
No
F775W
ACS/WFC
Imaging
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F475W
ACS/WFC
Imaging
No
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F775W
ACS/WFC
Imaging
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F475W
ACS/WFC
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WFPC2
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F450W
WFPC2
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F606W
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F450W
WFPC2
Imaging
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F606W
WFPC2
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F450W
WFPC2
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F606W
WFPC2
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ACS/WFC
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No
F606W
ACS/WFC
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No
F606W
ACS/WFC
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F606W
ACS/WFC
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No
F606W
ACS/WFC
Imaging
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No
F606W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F606W
ACS/WFC
Imaging
No
No
F606W
POS-TARG
DITHER
0.3535
LINE
false
false
2
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