Assigned ID: 283 ----- Attempting Submission 1 (Fri Feb 25 05:09:48 GMT 2011) ----- Dear Beth, Thanks very much for your help so far. You will have seen that I had a response from the TTRB, and the new target has been accepted. So I am now submitting the completed Phase II for your consideration. Cheers, Dougal ----- Attempting Submission 1 (Wed Jun 29 01:13:05 GMT 2011) ----- Probing the outer limits of a galactic halo - deep imaging of exceptionally remote globular clusters in M31 Globular clusters (GCs) are fossil relics from which we can obtain critical insights into the formation and growth of galaxies. As part of the ongoing Pan-Andromeda Archaeological Survey (PAndAS) we have discovered a group of exceptionally remote GCs in the M31 halo, spanning a range in projected galactocentric distance of 85-145 kpc. Here we apply for deep ACS imaging of 13 such targets, which will allow us to study their constituent stellar populations, line-of-sight distances, and structural parameters. Our measurements will facilitate the use of these GCs as a unique set of probes of the exceptionally remote halo of a large disk galaxy, opening up a completely new area of parameter space to observational constraint. Comparing the properties of our targets with more centrally-located objects will provide a much clearer picture of the M31 GC population than is presently available, while comparison with the outermost Milky Way GCs will further elucidate well-known disparities between the two systems and offer vital clues to differences in their assembly. In addition, our measurements will substantially augment a broad swathe of science that is presently underway - including probing the dark mass distribution in M31 at very large radii, and investigating the detailed chemical composition of M31 GCs via high-resolution integrated-light spectroscopy.
The aim of this program is to conduct ACS/WFC resolved imaging of 13 globular clusters in the extreme outer reaches of the Andromeda galaxy (M31, NGC224). Using these observations we will construct a colour-magnitude diagram for each target cluster, allowing us to study their constituent stellar populations, structures, and line-of-sight distances. ACS/WFC possesses a sufficiently wide field of view to fully cover each target cluster and sample the surrounding halo field, while providing a suitably high pixel scale to resolve even the most compact targets in our list into their constituent stars in regions outside their innermost cores. It also possesses considerably higher throughput than WFC3/UVIS in the mid-optical passbands we will use. Although charge-transfer inefficiency is now a non-negligible issue for ACS/WFC photometry, we do not expect our science to be negatively impacted. CTE effects are somewhat mitigated because (i) we will be conducting deep broadband imaging, where the background is comparatively high, and (ii) our target clusters cover a rather small region on the camera (typically with radius ~500 pixels). In addition, sophisticated tools (such as that developed by Anderson & Bedin at STScI) enable CTE effects to be corrected with a high degree of precision. We will observe using the F606W and F814W filters. These offer maximum throughput and match the vast majority of extant ACS/WFC imaging of M31 and Galactic globular clusters. In order to achieve our science goals we require the cluster colour-magnitude diagrams to reach at least 2 magnitudes below the level of the horizontal branch, and cover the possibility that the horizontal branch may extend significantly to blue colours. The horizontal branch level in clusters at the distance and and typical foreground extinction of M31 (D ~ 780 kpc, A_V ~ 0.1 mag) is V ~ 25. The ACS/WFC exposure time calculator shows that suitable signal-to-noise can be achieved with three ~800 s exposures in both F606W and F814W. With these exposure durations the ETC suggests we will reach S/N ~ 10 for red giant branch stars with V ~ 27.3 -- that is, more than 2 magnitudes below the horizontal branch level. On the horizontal branch at V ~ 25, we expect S/N ~ 60, which is excellent for an accurate assessment of horizontal branch morphology even if this feature extends far to the blue. In no individual exposure will the brightest cluster red giants (at V ~ 22) be saturated, meaning the upper parts of the red giant branch will be fully sampled at high signal-to-noise (> 350). For each target our observations are most efficiently arranged over a two orbit visit -- one orbit per filter. Even though our targets span a range of declinations and therefore have a range of orbital visibility periods, at minimum we will obtain 3x800s exposures in F606W and F814W. We have used the "auto-adjust" feature in APT to deliver maximum on-target exposure time per orbit. We place the F814W exposures, for which ACS/WFC has slightly lower throughput, on the second orbit of each visit as the available exposure time is slightly longer than on the first orbit. Our overall allocation is 13x2 = 26 orbits. We place each target at the WFC1 aperture. This will ensure full coverage of the majority of each cluster, while avoiding the ACS/WFC inter-chip gap. In order to minimise the effect of this gap on our imaging we will employ a 3-point dither in each filter using the ACS-WFC-DITHER-LINE pattern. This will enable cosmic ray and hot pixel rejection across the field of view. All but one of our visits are unconstrained in orientation. The exception is visit 08, for target NGC224-011758+391453 which lies 2.1 arcmin from another exceptionally remote M31 globular cluster. We aim to image both these clusters in the one ACS/WFC field. To do so we will place the WFCENTER aperture at the mid-point of the line joining the two objects, and require some relatively broad orientation restrictions in order to keep the two clusters sufficiently far away from the edges of the field of view and from the inter-chip gap. We will conduct coordinated parallel observations using WFC3/UVIS to sample the M31 halo near each target cluster. The aim is to construct colour-magnitude diagrams for field halo stars at large distances from the centre of M31. We will utilise the F606W and F814W filters, which offer maximum thoughput. Exposure times are similar to those employed for our primary observations, but again maximised using the "auto-adjust" feature in APT. Since we are not imaging a specific target with any of these parallels, it does not matter whether the dither pattern we have selected for the primary imaging ends up covering the WFC3/UVIS inter-chip gap or not. Each of our visits (even visit 08, which has fairly unrestrictive orientation requirements) is schedulable on numerous occasions throughout Cycle 19, including significant periods outside the proscribed interval 11 Nov 2011 - 01 Mar 2012. N/A N/A We have exchanged one target specified in the Phase I proposal (NGC224-011800+391659) with a new target (NGC224-001740+431839) by application to the TTRB. This is because the original target lies just 2.1 arcmin from another target (NGC224-011758+391453) and will therefore fall within the field of view when that object is imaged. RESOLVED STELLAR POPULATIONS 12 false 0.0 0.0 false false false false SUPPORTED EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 19.0 +/- 0.1, V-I = 0.9 +/- 0.1, E(B-V) = 0.13 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 17.8 +/- 0.1, V-I = 0.9 +/- 0.1, E(B-V) = 0.07 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 20.7 +/- 0.1, V-I = 0.9 +/- 0.1, E(B-V) = 0.09 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 22.7 +/- 0.1, V-I = 0.9 +/- 0.1, E(B-V) = 0.06 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 25.0 +/- 0.5, V-I = 0.5 +/- 0.5, E(B-V) = 0.07 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 22.8 +/- 0.1, V-I = 1.1 +/- 0.1, E(B-V) = 0.16 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 19.0 +/- 0.1, V-I = 0.9 +/- 0.1, E(B-V) = 0.06 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 SURF(V) =16.4 +/- 0.1, V-I = 0.8 +/- 0.1, E(B-V) = 0.05 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 18.1 +/- 0.1, V-I = 0.9 +/- 0.1, E(B-V) = 0.05 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 22.1 +/- 0.1, V-I = 0.8 +/- 0.1, E(B-V) = 0.07 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 21.1 +/- 0.1, V-I = 1.0 +/- 0.1, E(B-V) = 0.06 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 19.0 +/- 0.1, V-I = 0.9 +/- 0.1, E(B-V) = 0.10 +/- 0.01 EXT-CLUSTER GLOBULAR CLUSTER HALO J2000 J2000 SURF(V) = 22.5 +/- 0.1, V-I = 1.0 +/- 0.1, E(B-V) = 0.11 +/- 0.01 ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W POS-TARG DITHER 3.011 LINE false false 3 85.28 ACS-WFC-DITHER-LINE 1 false /Users/dougal/Astronomy/ACS_12515/PhaseII/OP-cache/HST_12515_PhaseII-v01.xml The scheduling data was generated by CASM 19.3. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. (Tic-Visit :proposal-id 12515 :visit-id "10" :proposal-version -1 :trans-version "20110509" :date "22-Jun-2011 12:45:07.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3437840 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12515 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12515 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12515 :visit-id "10" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3118 :al-overhead-at-end 0 :internal-dur-at-end 1019 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) true 2 0 /Users/dougal/Astronomy/ACS_12515/PhaseII/OP-cache/HST_12515_PhaseII-v11.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12515 :visit-id "11" :proposal-version -1 :trans-version "20110509" :date "22-Jun-2011 12:45:10.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3437840 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12515 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12515 :visit-id "11" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12515 :visit-id "11" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3118 :al-overhead-at-end 0 :internal-dur-at-end 1019 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) true 2 0 /Users/dougal/Astronomy/ACS_12515/PhaseII/OP-cache/HST_12515_PhaseII-v12.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12515 :visit-id "12" :proposal-version -1 :trans-version "20110509" :date "22-Jun-2011 12:45:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3437840 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12515 :visit-id "12" :obset-id "12" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12515 :visit-id "12" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12515 :visit-id "12" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3118 :al-overhead-at-end 0 :internal-dur-at-end 1019 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) true 2 0 /Users/dougal/Astronomy/ACS_12515/PhaseII/OP-cache/HST_12515_PhaseII-v13.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12515 :visit-id "13" :proposal-version -1 :trans-version "20110509" :date "22-Jun-2011 12:45:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 3437840 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12515 :visit-id "13" :obset-id "13" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12515 :visit-id "13" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12515 :visit-id "13" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3118 :al-overhead-at-end 0 :internal-dur-at-end 1019 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3341 :pcs-gap 0 ) true 2 0