0 Assigned ID: 315 ----- Attempting Submission 1 (Thu Apr 06 22:11:50 GMT 2017) ----- HST Phase I Proposal 315 (IR_LEGUS_apt) successfully submitted. Receipt: # 315-1 ----- Attempting Submission 2 (Thu Apr 06 22:37:33 GMT 2017) ----- HST Phase I Proposal 315 (IR_LEGUS_apt) successfully submitted. Receipt: # 315-2 ----- Attempting Submission 3 (Fri Apr 07 12:58:40 GMT 2017) ----- HST Phase I Proposal 315 (IR_LEGUS_apt) successfully submitted. Receipt: # 315-3 ----- Attempting Submission 4 (Fri Apr 07 13:35:43 GMT 2017) ----- HST Phase I Proposal 315 (IR_LEGUS_apt) successfully submitted. Receipt: # 315-4 ----- Attempting Submission 7 (Fri Apr 07 18:16:01 GMT 2017) ----- HST Phase I Proposal 315 (IR_LEGUS_apt) successfully submitted. Receipt: # 315-7 This target is not used in this proposal. Added Visit 05-2, is renamed to visit 05. -13527380 ----- Attempting Submission 1 (Tue Jul 25 16:41:09 GMT 2017) ----- ----- Attempting Submission 2 (Fri Jul 13 19:50:56 GMT 2018) ----- ----- Attempting Submission 3 (Mon Jul 16 10:46:11 GMT 2018) ----- I have only run the Orbit and Visit Planner for Visit 05-2. All looks OK. The error/warning is about the 21 orbits because I have added one visit (05-2) to replace Visit 05, which is currently not executable. The Emergence of Star Clusters We propose to measure the timescale for the clearing of natal dust by young star clusters. We will augment existing archival UV-to-I imaging data with new WFC3/IR images at J, H, and Paschen-beta for a sample of six nearby star forming galaxies. Under the standard scenario that the clearing is performed by supernovae (> 3 Myr), simulations show that not enough ionizing photons can escape galaxies and reionize the Universe at z>6. However, the actual clearing timescale is poorly established. We will obtain accurate ages and extinctions for the embedded and emergent young clusters in our target galaxies, in order to: (1) determine whether dust clearing occurs before or after 3 Myr, (2) investigate environmental dependencies for the timescale, and (3) establish the principal mechanisms for enabling the escape of ionizing photons from galaxies. Our project provides the physical footing for future JWST observations aimed at determining the sources of reionization of the Universe. The combination of archival and new images will also equip the community with a lasting legacy of homogeneous UV-to-IR coverage for a sample of nearby galaxies. 1. The Sample The sample is chosen primarily with the following criteria: (1) distance range between 2 Mpc and 7 Mpc, as a compromise between maximizing spatial resolution with WFC3/IR and spatial coverage of each galaxy; (2) inclination <50 degrees to minimize line-of-sight confusion; (3) Galactic latitude >20 degrees, to control effects of Milky Way extinction; (4) availability of ancillary data, specifically GALEX FUV and NUV and Spitzer 8-160 micron imaging; (5) availability of HST WFC3/UVIS and/or ACS archival imaging, covering at least from NUV to I band, including H-alpha, to leverage existing data. For our distance range, the spatial resolution of the WFC3/IR channel will be between 2 pc and 7.5 pc, i.e., sufficient to separate star clusters, which have uniform effective radii ~3 pc, and their ionized gas emission from surrounding contaminants. At the same time, a sizable portion of each galaxy, between 1.3 kpc and 4.4 kpc, will be observed. These requirements yield a sample of six galaxies, sufficient to accumulate statistics on young star clusters, and for which we request additional observations with WFC3/IR to achieve the age/extinction accuracies necessary for this project. 2. Proposed Observations The six galaxies in our sample have archival images with WFC3/UVIS and/or ACS/WFC in NUV (F275W), U (F336W), B (F438W or F439W), V (F555W or F547M or F550M), H-alpha (F657N or F658N), and I (F814W). The suite of filters is complete for five of the six galaxies in at least one pointing. A few of the galaxies (NGC1313, NGC5457, and NGC7793) have two or more pointings with complete filter coverage. The sixth galaxy, NGC300, does not have an H-alpha observation in the archive. We request one to complete the filter suite for this galaxy, but we will drop our request if the H-alpha of NGC300 is observed as part of other programs in our proposed pointing. This galaxy has FUV observations with the ACS/SBC over multiple pointings (GO-13743), covering almost the same footprint as a WFC3 field-of-view. We will use the FUV data to extend our SED modeling. Presence of emission lines in the broad F555W and F814W filters will be modeled via theoretical SEDs that include such lines; furthermore, we expect relatively little contamination, as the line emission is usually more extended than the clusters. We request WFC3/IR observations for all six galaxies in the filters centered at: J (F110W), H (F160W), and P-beta (F128N), in order to extend the SEDs into the IR. We will *match as closely as possible* existing footprints from the WFC3/UVIS and/or ACS/WFC that are targeting areas of high dust emission, as inferred from the Spitzer 24 micron maps. For galaxies with multiple pointings in the archive (see above), we request to observe two fields in the IR, in order to increase the number statistics. This will also compensate for the smaller IR field-of-view relative to those of the optical cameras (about 50% smaller). 3. Exposure Times and Orbit Request Rescaling from NGC5253 (Calzetti et al. 2015), the P emission of a 5 Myr old, 1,000 M_sun star cluster with AV =3 mag extinction at a distance of 6 Mpc is expected to have a surface brightness of 2x10-16 erg/s/cm2/arcsec2. From the WFC3/IR ETC, this surface brightness is observed in the F128N filter with S/N>=10 in 3x3 pixel bins with an exposure time of 2,200 seconds, divided into 3 dither patterns (to remove CRs). The same cluster is observable in F110W with S/N=20 in t=900 seconds, and in F160W in t=1,200 seconds. The higher S/N of the broad-band filters ensures that the subtraction of the stellar continuum from the narrow-band filter will not dominate the noise budget. For NGC300 (2 Mpc), we request 1,500 seconds exposure in WFC3/UVIS F657N to detect the H-alpha emission from a cluster as specified above. When including overheads for guide star acquisition and reacquisition, small angle ma- neuvers, filter change and (for NGC300) camera change, etc., we obtain that the IR obser- vations require 2 orbits per pointing per galaxy (1 orbit in P-beta and one orbit in J+H), for a total of 18 orbits for 9 pointings. One additional orbit is allocated for the H-alpha observation of NGC300. Galaxies and the IGM 6 false false false false false false false SUPPORTED GALAXY SPIRAL SPIRAL ARM YES Matched to existing HST/WFC3 observations J2000 J2000 GALAXY SPIRAL STAR FORMING REGION YES Matched to existing HST/WFC3 observations J2000 J2000 GALAXY SPIRAL STAR FORMING REGION YES Matched to existing HST/WFC3 observations. J2000 J2000 GALAXY MAGELLANIC IRREGULAR YES Matched to existing HST/WFC3 observations. J2000 J2000 GALAXY MAGELLANIC IRREGULAR YES Matched to existing HST/WFC3 observations. J2000 J2000 GALAXY MAGELLANIC IRREGULAR YES Matched to existing HST/WFC3 observations. J2000 J2000 GALAXY SPIRAL STAR FORMING REGION YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY SPIRAL SPIRAL ARM YES This object was generated by the targetselector and retrieved from the NED database. J2000 J2000 GALAXY SPIRAL SPIRAL ARM STAR FORMING REGION YES This object was generated by the targetselector and retrieved from the NED database. J2000 J2000 GALAXY SPIRAL SPIRAL ARM STAR FORMING REGION YES This object was generated by the targetselector and retrieved from the NED database. J2000 J2000 GALAXY SPIRAL SPIRAL ARM YES J2000 WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/UVIS Imaging No No F657N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F128N The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1526589589000 223.0 (Tic-Visit :proposal-id 15330 :visit-id "01" :proposal-version -1 :trans-version "20170613" :date "25-Jul-2017 12:35:45.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2715792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15330 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15330 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2896 :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 3260 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15330 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2996 :al-overhead-at-end 0 :internal-dur-at-end 538 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3260 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15330 :visit-id "02" :proposal-version -1 :trans-version "20170613" :date "25-Jul-2017 12:35:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2820240 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15330 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15330 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3196 :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 3546 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15330 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3296 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3546 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1511716706000 11.95345734009149 (Tic-Visit :proposal-id 15330 :visit-id "03" :proposal-version -1 :trans-version "20170613" :date "25-Jul-2017 12:35:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2820240 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15330 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15330 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3196 :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 3546 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15330 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3296 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3546 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1521951844000 168.1157769528022 (Tic-Visit :proposal-id 15330 :visit-id "04" :proposal-version -1 :trans-version "20170613" :date "25-Jul-2017 12:35:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2750608 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15330 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15330 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3046 :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 3393 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15330 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3146 :al-overhead-at-end 0 :internal-dur-at-end 576 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3393 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15330 :visit-id "11" :proposal-version -1 :trans-version "20171009" :date "13-Jul-2018 15:36:19.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2715792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15330 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15330 :visit-id "11" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2946 :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 3298 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15330 :visit-id "11" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3046 :al-overhead-at-end 0 :internal-dur-at-end 576 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15330 :visit-id "06" :proposal-version -1 :trans-version "20170613" :date "25-Jul-2017 12:36:06.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2750608 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15330 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15330 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3046 :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 3393 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15330 :visit-id "06" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3146 :al-overhead-at-end 0 :internal-dur-at-end 576 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3393 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15330 :visit-id "07" :proposal-version -1 :trans-version "20170613" :date "25-Jul-2017 12:36:11.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2750608 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15330 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15330 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3046 :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 3393 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15330 :visit-id "07" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3146 :al-overhead-at-end 0 :internal-dur-at-end 576 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3393 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1515999734000 85.0 (Tic-Visit :proposal-id 15330 :visit-id "08" :proposal-version -1 :trans-version "20170613" :date "25-Jul-2017 12:36:14.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2680976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15330 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15330 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2896 :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 3240 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15330 :visit-id "08" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2996 :al-overhead-at-end 0 :internal-dur-at-end 557 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3240 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1516074094000 85.55716631810361 (Tic-Visit :proposal-id 15330 :visit-id "09" :proposal-version -1 :trans-version "20170613" :date "25-Jul-2017 12:36:19.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2680976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15330 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15330 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2896 :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 3240 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15330 :visit-id "09" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2996 :al-overhead-at-end 0 :internal-dur-at-end 557 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3240 :pcs-gap 0 ) false 2 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1526686753000 222.03126291556862 (Tic-Visit :proposal-id 15330 :visit-id "10" :proposal-version -1 :trans-version "20170613" :date "25-Jul-2017 12:36:22.0" :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 1443744 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15330 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15330 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2927 :al-overhead-at-end 122 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3260 :pcs-gap 0 ) false 1 0