This target is not used in this proposal. This target is not used in this proposal. This target is not used in this proposal. This target is not used in this proposal. PARALLELS SIGNIFICANTLY EXTEND ALIGNMENT TIME ORBITAL VISIBILITY OVERRUN PARALLELS SIGNIFICANTLY EXTEND ALIGNMENT TIME ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN PARALLELS SIGNIFICANTLY EXTEND ALIGNMENT TIME This resubmission updates the visit requirements for Cycle 22, which were not set with the previous submission. Warnings about few seconds overruns are unfortunately not easy to resolve from our side. They arise due to detector dump and buffer times. Simple deacreasing of the exposure time can not resolve this issue. We believe that this would not pose a crucial problem for the required scheduling of our observations. We will be greatful if the observations are executed within our constraints. 703599225 ----- Attempting Submission 1 (Mon Jul 14 12:50:55 GMT 2014) ----- HST Phase II Proposal 13835 (GO13835_phaseII.apt) successfully submitted. ----- Attempting Submission 2 (Wed Jul 23 07:57:13 GMT 2014) ----- Warnings about few seconds overruns are unfortunately not easy to resolve from our side. They arise due to detector dump and buffer times. Simple deacreasing of the exposure time can not resolve this issue. We believe that this would not pose a crucial problem for the required scheduling of our observations. We will be greatful if the observations are executed within our constraints. The Proper Motion of Palomar 5 and its Tidal Tails The outer-halo Milky Way globular cluster Palomar 5 (Pal 5) shows prominent tidal tails (TT) extending over tens of degrees. Published ground-based proper motion (PM) measurements of Pal 5 are inconsistent with each other, and also with predictions from our numerical modeling (PM greater than 2 mas/yr in each component). Accurate PM would allow a detailed reconstruction of Pal 5's dissolution history and provide independent constraints on the shape of the Galactic potential. We propose to measure the PM of the Pal 5 cluster and a field 5 deg (2 kpc) along its TT with an accuracy of < 0.4 mas/yr via multi-epoch WFC3 and ACS observations in Cycles 20 and 22. We have identified a large number of QSOs and galaxies in these fields, which will allow us to achieve this accuracy on a three-year baseline. Combined with the large amount of available radial velocity data and detailed numerical modeling, the proposed observations will constrain the orbit of Pal 5 to greater accuracy than any other outer-halo satellite (< 30 km/s). Hence, it will enable us to tightly constrain the Galactic circular velocity and the flattening of the Galactic potential to less than 10% uncertainty. We will further use the PM-cleaned sample of stars in Pal 5 and its TT to unambiguously probe for variations of the present-day stellar mass function down to 0.2 Msun, enabling a direct estimate of Pal 5's mass loss rate. Together with the orbital information this will provide unique insights to the complex interplay of two-body relaxation and tidal shocking, which will have direct consequence for our understanding of the build-up of galaxy field populations and the evolution of cluster mass functions. We require two epochs of observations to measure the Pal 5 and its Tidal Tail (TT) proper motion (PM). The first epoch, as early in Cycle 20 as possible, and the second epoch late in Cycle 22, to guarantee a baseline of at least 3 yrs to achieve a PM precision of ~0.4 mas/yr. Each epoch will consist of three WFC3/UVIS-F814W pointings. One pointing will be on Pal 5, the other two will cover a QSO in a dense Tidal Tail region at 5 deg (about 2 kpc) projected distance from Pal5. Observations with the ACS/WFC-F606W and F814W in parallel will increase significantly the spatial coverage of Pal5 and its TT region and allow a deep probe to its stellar mass function. For the two TT fields a second orbit in the 1st epoch will be used with WFC3/UVIS-F606W to measure the Mass Function (MF) down to 0.2 M_sol in combination with the WFC3/UVIS-F814W 1st orbit observation. Four exposures, one short at the beginning of the orbit and three long, per epoch with WFC3/UVIS-F814W will be used to improve the PSF sampling and correct for detector imperfections (e.g. bad pixels) and cosmic rays. The first short and long exposures will have the same positions, while the dithering for the others uses a spacing of 1.302 arcsec. The specified orientation angles for the TT and Pal5 fields are chosen to allow earliest possible 1st epoch scheduling (17-24 Sept 2012) and latest possible 2nd epoch schedulling (Jul-Aug 2015) by including in the WFC3 fields the QSO in the TT field (RA=231.64458, DEC=2.0367500), brigth background galaxies whose brightest globular clusters can be used as background reference and spectroscopically confirmed stars in Pal5 and its TT. For the cluster ACS field we will use F814W in the first epoch and F606W in the second epoch to probe for variations of the MF beyond Pal 5's half-light radius. RESOLVED STELLAR POPULATIONS 12 false false 0.0 0.0 false false false SUPPORTED STELLAR CLUSTER GLOBULAR CLUSTER TIDAL TAIL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 STELLAR CLUSTER GLOBULAR CLUSTER HALO TIDAL TAIL J2000 J2000 STELLAR CLUSTER GLOBULAR CLUSTER HALO TIDAL TAIL J2000 J2000 GALAXY QSO QSO J2000 STAR K III-I J2000 STAR K III-I J2000 STAR K III-I J2000 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 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /Users/iskren/Work/Documents/Proposals/HST/Cycle22/OP-cache/GO13835_phaseII-v01.xml Second Epoch (Tic-Visit :proposal-id 13835 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "14-Jul-2014 11:07:32.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2291888 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13835 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13835 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2896 :al-overhead-at-end 112 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 1 /Users/iskren/Work/Documents/Proposals/HST/Cycle22/OP-cache/GO13835_phaseII-v02.xml Timing link suitability includes constraints ([03 After 02 by 0.1 to 0.1 days]) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. Second Epoch Tidal Tail field West of the QSO (Tic-Visit :proposal-id 13835 :visit-id "02" :proposal-version -1 :trans-version "20140605" :date "14-Jul-2014 11:09:04.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2291888 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13835 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13835 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2896 :al-overhead-at-end 112 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 1 /Users/iskren/Work/Documents/Proposals/HST/Cycle22/OP-cache/GO13835_phaseII-v03.xml Timing link suitability includes constraints ([03 After 02 by 0.1 to 0.1 days]) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. Second Epoch Tidal Tail field East of the QSO (Tic-Visit :proposal-id 13835 :visit-id "03" :proposal-version -1 :trans-version "20140605" :date "14-Jul-2014 11:09:10.0" :trans-errors '(:WARNINGS 2 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2291888 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13835 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13835 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2896 :al-overhead-at-end 112 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3222 :pcs-gap 0 ) true 1 1