0 Assigned ID: 2812 ----- Attempting Submission 1 (Mon Mar 21 19:27:17 GMT 2022) ----- HST Phase I Proposal 2812 successfully submitted. Receipt: # 2812-1 Note the inclusion of 'Visit 51'. Thi is a repeat of the failed WFC3 F475X exposures in the original Visit 5. -839210401 ----- Attempting Submission 1 (Mon Jul 04 15:46:01 GMT 2022) ----- HST Phase II Proposal 17145 successfully submitted. Receipt: # 17145-1 ----- Attempting Submission 2 (Mon Sep 26 15:36:01 GMT 2022) ----- HST Phase II Proposal 17145 successfully submitted. Receipt: # 17145-2 ----- Attempting Submission 3 (Mon Feb 19 13:35:58 GMT 2024) ----- Clearing a Window Into Galaxy Formation: The Impact of Globular Cluster Metallicity Distributions The MAST archive holds a rich legacy of imaging data for globular cluster (GC) systems in external galaxies that represents an investment of hundreds of HST orbits. But its full impact to make GCs key tracers of galaxy formation has yet to be realized. To achieve that, their true metallicity distribution functions (MDFs) must be established on an internally consistent base. Such MDF parameters as the mean metallicity, and the relative numbers of `blue' (metal-poor) and `red' (metal-rich) GCs are key predictions from current galaxy and GC formation theories that help decode the history of accretions versus in-situ formation. The observational barrier is that direct spectroscopic metallicities for GCs are hard to obtain in large numbers and are beyond reach for very distant galaxies. In most cases we have to work instead with the GC color distribution function (CDF), the photometric proxy for the MDF. But the many optical/NIR color indices that have been used to generate CDFs are all nonlinear functions of metallicity and give biased, misleading impressions of the true MDFs. We propose an efficient program of multifilter imaging of the Coma BCG NGC 4874, the richest GC system in the local universe, to measure all the commonly used GC color indices in a single system. Direct empirical transformations will be derived for every color into the fiducial index (g-z), which is the only one with a well established conversion into [Fe/H] based directly on spectroscopic metallicities. This program will take a major step towards defining the true MDFs for GC systems in almost 200 galaxies, and a new level of comparison with theory. ACS/WFC and WFC/UVIS are used to image the region around NGC 4874, the central giant galaxy in the Coma cluster. The goal is to complete photometry of the globular cluster population in NGC 4874 in six different filters and thus to generate accurate, empirical transformations between color indices. These will be used as a basis for producing self-consistent metallicity distribution functions for globular clusters in a large number of galaxies. Dr. William Harris has had decades of experience in imaging and photometry of globular cluster systems around galaxies and has been the PI of a dozen HST programs. Graduate student Kate Hartman works actively on photometric analysis of globular cluster systems around giant galaxies, particularly with HST data as well. Galaxies Stellar Populations and the Interstellar Medium 6 false false false false false false false false SUPPORTED GALAXY BCM ELLIPTICAL HALO Matches field selected by Cho et al. 2016, ApJ 822, 95. J2000 J2000 GALAXY BCM ELLIPTICAL HALO Matches previous ACS exposures of NGC 4874 J2000 ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F850LP WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F475X POS-TARG DITHER 0.17 LINE false false 3 47.23 ACS-WFC-DITHER-LINE 1 false POS-TARG DITHER 0.145 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE 2 false POS-TARG DITHER 0.33 LINE false false 6 47.0 SPIRAL 3 false /Users/bill/Documents/OP-cache/GO17145_phaseII-v01.xml The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. 1706640974000 269.5 (Tic-Visit :proposal-id 17145 :visit-id "01" :proposal-version -1 :trans-version "20220516" :date "26-Sep-2022 10:50:09.0" :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 1732464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17145 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17145 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2775 :al-overhead-at-end 119 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3165 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17145 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2769 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3165 :pcs-gap 0 ) true 2 0 /Users/bill/Documents/OP-cache/GO17145_phaseII-v51.xml The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17145 :visit-id "51" :proposal-version -1 :trans-version "20230626" :date "19-Feb-2024 08:31:43.0" :trans-errors '(:WARNINGS 0 :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 866240 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17145 :visit-id "51" :obset-id "51" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17145 :visit-id "51" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2760 :al-overhead-at-end 116 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3144 :pcs-gap 0 ) true 1 0 /Users/bill/Documents/OP-cache/GO17145_phaseII-v06.xml The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17145 :visit-id "06" :proposal-version -1 :trans-version "20220516" :date "26-Sep-2022 11:31:06.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1705344 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17145 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17145 :visit-id "06" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2780 :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 3165 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17145 :visit-id "06" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2773 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3165 :pcs-gap 0 ) true 2 0 /Users/bill/Documents/OP-cache/GO17145_phaseII-v07.xml The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. 1702767832000 300.4566426364125 (Tic-Visit :proposal-id 17145 :visit-id "07" :proposal-version -1 :trans-version "20220516" :date "26-Sep-2022 11:31:06.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1705344 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17145 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17145 :visit-id "07" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2780 :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 3165 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17145 :visit-id "07" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2773 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3165 :pcs-gap 0 ) true 2 0 /Users/bill/Documents/OP-cache/GO17145_phaseII-v08.xml The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17145 :visit-id "08" :proposal-version -1 :trans-version "20220516" :date "26-Sep-2022 11:31:07.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1705344 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17145 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17145 :visit-id "08" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2780 :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 3165 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17145 :visit-id "08" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2773 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3165 :pcs-gap 0 ) true 2 0 /Users/bill/Documents/OP-cache/GO17145_phaseII-v05.xml The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. 1704591300000 289.11245843732877 (Tic-Visit :proposal-id 17145 :visit-id "05" :proposal-version -1 :trans-version "20220516" :date "26-Sep-2022 11:31:07.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 852672 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17145 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17145 :visit-id "05" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2771 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3165 :pcs-gap 0 ) true 1 0