An HST Treasury of Stellar Feedback in Action: Sizes, Structures, and Power Sources for 50,000 Extragalactic HII Regions

updated abstract -1724739097 Assigned ID: 3152 ----- Attempting Submission 1 (Fri Mar 25 07:07:14 GMT 2022) ----- HST Phase I Proposal 3152 successfully submitted. Receipt: # 3152-1 ----- Attempting Submission 2 (Fri Mar 25 16:34:59 GMT 2022) ----- HST Phase I Proposal 3152 successfully submitted. Receipt: # 3152-2 ----- Attempting Submission 3 (Fri Mar 25 17:06:24 GMT 2022) ----- HST Phase I Proposal 3152 successfully submitted. Receipt: # 3152-3 ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN ORBITAL VISIBILITY OVERRUN Duplicated failed visit 06 (which has been approved) as visit 21, including a shift in the target position and orient flip to improve schedulability. Re-sending this because APT froze a few days ago during the submission containing Visit21 and I was unsure if it went through. -1884619950 ----- Attempting Submission 1 (Thu Jul 14 14:51:19 GMT 2022) ----- ----- Attempting Submission 2 (Wed Aug 31 15:32:46 GMT 2022) ----- ----- Attempting Submission 3 (Wed Jan 18 05:08:16 GMT 2023) ----- ----- Attempting Submission 4 (Mon Mar 06 15:46:18 GMT 2023) ----- ----- Attempting Submission 5 (Tue Mar 07 03:15:29 GMT 2023) ----- ----- Attempting Submission 6 (Thu Oct 19 16:40:58 GMT 2023) ----- Warnings pertain to completed observations. An HST Treasury of Stellar Feedback in Action: Sizes, Structures, and Power Sources for 50,000 Extragalactic HII Regions We propose a Treasury Halpha (F657N) imaging survey that will measure the sizes (radii) and structures (e.g. shell fraction) for >50,000 nebulae, including HII regions, supernovae, and planetary nebulae across the full range of galactic environments in 19 nearby main-sequence galaxies. These targets form a representative sample of massive, star-forming galaxies, and these proposed observations, only possible with the HST, will complete a rich dataset of i) VLT/MUSE IFU, providing spectroscopic information for all identified nebulae; ii) multi-filter broad-band HST imaging of >40,000 clusters, iii) ALMA spectral line mapping of >20,000 molecular clouds; and iv) >100 hours of upcoming near- and mid-IR imaging from JWST probing dust emission and embedded star formation. Together these maps and higher-level data products are crucial for answering: (1) What is the dominant mechanism for pre-SNe stellar feedback? (2) On what timescales do young clusters clear their birth-clouds? (3) What processes are responsible for cloud destruction? (4) What role does escaping radiation play in larger-scale galactic evolution? Taken together, the products obtained as part of this Treasury program will provide the definitive high resolution view of HII regions in nearby galaxies, essential to answer questions fundamental to our understanding of star formation and stellar feedback. These observations are needed now to form a crucial part of Hubble's lasting legacy. The PHANGS-Halpha sample contains 19 nearby galaxies (d<=17 Mpc) with existing broad-band imaging as part of the PHANGS-HST program, VLT/MUSE IFU spectroscopy as part of PHANGS-MUSE, and upcoming JWST imaging as part of PHANGS-JWST. The new HST-Halpha observations are critical for: (1) breaking the age/reddening degeneracy of star clusters, (2) identifying complete samples of HII regions, including the most compact ones which are not detetable in ground-based observations, (3) measuring the radii of tens of thousands of HII regions (which is only possible from the high resolution imaging of HST), and (4) directly measuring the leakage of ionizing photons from HII regions. We will obtain Halpha narrow-band imaging with the appropriate narrowband Halpha filter using 4 exposures (~600 seconds each) in a single orbit per pointing. It is critical to step over the gap between CCDs in the WFC3 camera, and also to eliminate cosmic rays. Sub-pixel dithering is less important for this program due to the extended morphology of the ionized gas. When possible, we restrict the orientation angle to closely match that used for the PHANGS-HST broad-band images. Overview: Our program is led by Rupali Chandar (PI: Halpha-LEGUS), Ashley Barnes, and Janice Lee (PI: PHANGS-HST; PHANGS-JWST), and incorporates scientific expertise in all aspects of star and cluster formation from the properties of their birth clouds, to the earliest phases of star formation, through the process of stellar evolution, feedback and interaction with the ISM. Our team has deep experience in working with the full range of observations required for feedback studies (ALMA CO maps, MUSE IFU spectroscopy, HST broad- and narrow-band imaging) and in theoretical work. Below we identify the leads of the different components of the PHANGS program. Young Clusters and Stellar Feedback: Chandar, Barnes, and Lee are leading this effort, and have considerable experience in analyzing broad- and narrow-band HST images of nearby galaxies to study the stellar content and associated ionized gas. Molecular Gas and ISM: Schinnerer and Leroy are the co-PI's of PHANGS-ALMA, the principle ALMA survey of nearby galaxies. This collaboration has already produced a number of important papers, and includes a large number of experts based in Europe. Star Formation & Gas Diagnostics from Optical Spectroscopy: Schinnerer, Groves, & Kreckel are leading the PHANGS-MUSE effort (PI: Schinnerer), a ESO Large program obtaining ~0.7"-1" optical spectroscopy for many PHANGS galaxies Star Formation Theory: Ostriker, Glover & Klessen will lead the theoretical effort for our team. All are leading experts who have developed independent models that deal with aspects of gas, stars, and feedback. Stellar Populations and the Interstellar Medium Galaxies 0 false false false true false false false false SUPPORTED GALAXY SPIRAL This object was generated by the targetselector and retrieved from the SIMBAD database. 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J2000 J2000 WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F547M POS-TARG MOSAIC DITHER 4 2.414 WFC3-UVIS-DITHER-BOX false 81.785 true 0.112 0.173 2 85.759 POS-TARG WFC3-UVIS-GAP-LINE 23.884 1

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CASM was run in Phase II mode. 1685015890000 122.09151090468299 (Tic-Visit :proposal-id 17126 :visit-id "15" :proposal-version -1 :trans-version "20230626" :date "19-Oct-2023 12:33:59.0" :trans-errors '(:WARNINGS 1 :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 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17126 :visit-id "15" :obset-id "15" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17126 :visit-id "15" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2770 :al-overhead-at-end 126 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3139 :pcs-gap 0 ) true 1 1 1697733241490 The scheduling data was generated by CASM 31.1. CASM was run in Phase II mode. 1670280344000 297.8065362537839 (Tic-Visit :proposal-id 17126 :visit-id "16" :proposal-version -1 :trans-version "20230626" :date "19-Oct-2023 12:34:01.0" :trans-errors '(:WARNINGS 1 :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 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17126 :visit-id "16" :obset-id "16" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17126 :visit-id "16" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2762 :al-overhead-at-end 126 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3135 :pcs-gap 0 ) true 1 1 1697733243898 The scheduling data was generated by CASM 31.1. CASM was run in Phase II mode. 1702590181000 295.9799647282454 (Tic-Visit :proposal-id 17126 :visit-id "20" :proposal-version -1 :trans-version "20230626" :date "19-Oct-2023 12:34:03.0" :trans-errors '(:WARNINGS 1 :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 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17126 :visit-id "20" :obset-id "20" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17126 :visit-id "20" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2762 :al-overhead-at-end 126 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3135 :pcs-gap 0 ) true 1 1 1697733246270 The scheduling data was generated by CASM 31.1. CASM was run in Phase II mode. 1683212906000 52.0 (Tic-Visit :proposal-id 17126 :visit-id "17" :proposal-version -1 :trans-version "20230626" :date "19-Oct-2023 12:34:06.0" :trans-errors '(:WARNINGS 1 :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 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17126 :visit-id "17" :obset-id "17" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17126 :visit-id "17" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2774 :al-overhead-at-end 126 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3139 :pcs-gap 0 ) true 1 1 1697733248372 The scheduling data was generated by CASM 31.1. CASM was run in Phase II mode. 1682916176000 52.0 (Tic-Visit :proposal-id 17126 :visit-id "18" :proposal-version -1 :trans-version "20230626" :date "19-Oct-2023 12:34:08.0" :trans-errors '(:WARNINGS 1 :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 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17126 :visit-id "18" :obset-id "18" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17126 :visit-id "18" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2774 :al-overhead-at-end 126 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3139 :pcs-gap 0 ) true 1 1 1697733250314 The scheduling data was generated by CASM 31.1. CASM was run in Phase II mode. 1692303340000 334.0 (Tic-Visit :proposal-id 17126 :visit-id "19" :proposal-version -1 :trans-version "20230626" :date "19-Oct-2023 12:34:10.0" :trans-errors '(:WARNINGS 1 :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 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17126 :visit-id "19" :obset-id "19" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17126 :visit-id "19" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2854 :al-overhead-at-end 126 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3216 :pcs-gap 0 ) true 1 1