17180( 2) - 29-Jun-2022 19:12:15 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17180 Version: 2 Check-in Time: 29-Jun-2022 19:12:15 STScI Edit Number: 0 Title What's hidding in the neutral gas? Dissecting the different metallicity components in NGC 1313 ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Svea S Hernandez Space Telescope Science Institute - ESA - Y JWST CoI: Dr. Alessandra Aloisi Space Telescope Science Institute N CoI: Dr. Angela Adamo Stockholm University N CoI: Dr. Matilde Mingozzi Space Telescope Science Institute N CoI: Dr. Bethan Lesley James Space Telescope Science Institute - ESA - N JWST CoI: Dr. Alec S. Hirschauer Space Telescope Science Institute N CoI: Dr. Claude-Andre Faucher-Giguere Northwestern University N CoI: Dr. Linda J. Smith Space Telescope Science Institute N CoI: Dr. Logan H Jones Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract Metallicity is a critical parameter shaping the evolution of galaxies on cosmic timescales. In spite of the importance of this single parameter and the variety of tools available to investigate its distribution in star-forming galaxies, detailed comparisons of the abundances obtained from the ionized-gas, neutral-gas, and stellar components are still lacking to fully understand the chemical state and evolution of galaxies. We propose to remedy the situation by exploiting the unique capabilities of HST/COS in the FUV regime, acquiring and analyzing G130M/1291 spectroscopic observations of 7 pointings (2 archival + 5 new) in the low-metallicity environment of NGC 1313. The data will provide a rich assortment of neutral-gas metallicity tracers allowing us to assess the abundances of the neutral ISM and estimate the stellar metallicities of the targeted stellar clusters. Our study will combine the metallicities of the neutral gas and stellar populations with existing abundances of the ionized gas, performing the first co-spatial comparison of these three components in a low metallicity system, investigating the degree of homogeneity between the stars and multi-phase ISM across the galaxy on spatial scales of ~55 pc. This complete and inexpensive study in the barred spiral NGC 1313 will uncover the links between the different internal components (stars, neutral and ionized gas), and their precise roles in moderating the mixing timescales and star formation in galaxies. ------------------------------------------------------------------------------------ Observations Description ------------------------ This HST/COS program observes 5 young massive clusters (YMCs) in the nearby barred spiral galaxy NGC 1313 with the G130M/1291 COS configuration in 5 different visits. Each individual visit acquires the target using the ACQ/IMAGE mode with MIRRORA. The spectroscopic observations are collected using FP-POS = 3 and 4. 17180( 2) - 29-Jun-2022 19:12:15 - [ 2] Target Selection: At a distance of ~4.4 Mpc, NGC 1313 is an ideal target for a spatially-resolved study with the 2.5" COS aperture, as it allows us to sample the abundances of stellar clusters and the warm ISM on spatial scales of ~55 pc. This COS sample of YMCs covers a broad parameter space both in stellar ages (1-20 Myr) and spatial scales (R~ 0.1-4.4 kpc). The broad range in stellar ages is essential to test mixing timescale scenarios in a lower metallicity regime, particularly those where newly-synthesized metals take more than ~10 Myr to fully mix on spatial scales of <~100 pc. The exposure times were calculated assuming the spectrum of a simple stellar population of age 5 or 25 Myr (based on photometric ages) renormalized to the WFC3/F275W magnitudes to reach S/N~10 at 1250 A. ------------------------------------------------------------------------------------ 17180( 2) - 29-Jun-2022 19:12:15 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-1313-P1 STELLAR CLUSTER, YOUNG RA=03H18M17.5990S +/- 0.1", J2000 V = 18.34 +/- 0.05 F275W =17.3 ASSOCIATION DEC=-66D29'52.13" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-1313-P2 STELLAR CLUSTER, YOUNG RA=03H18M15.8014S +/- 0.1", J2000 V = 18.14 +/- 0.05 F275W = 16.3 ASSOCIATION DEC=-66D29'53.09" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-1313-P3 STELLAR CLUSTER, YOUNG RA=03H18M8.2531S +/- 0.1", J2000 V = 18.31 +/- 0.05 F275W = 17 ASSOCIATION DEC=-66D29'42.03" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-1313-P4 STELLAR CLUSTER, YOUNG RA=03H18M6.3653S +/- 0.1", J2000 V = 19.18 +/- 0.05 F275W = 17.4 ASSOCIATION DEC=-66D30'23.18" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-1313-P5 STELLAR CLUSTER, YOUNG RA=03H18M3.1204S +/- 0.1", J2000 V = 18.23 +/- 0.05 F275W = 16.5 ASSOCIATION DEC=-66D30'14.16" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17180( 2) - 29-Jun-2022 19:12:15 - [ 4] Visit: 01 (NGC1313-P1) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-1313-P1 COS/NUV ACQ/IMA PSA MIRRORA 1 3.5 S (3.5 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-1313-P1 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=4712, FP-POS=3 1 860 S G see below (2772 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-1313-P1 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=4712, FP-POS=4 1 945 S G see below (3030 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1313-P1 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-1313-P1 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2772.0 S G NGC-1313-P1 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 3030.0 S G 17180( 2) - 29-Jun-2022 19:12:15 - [ 5] Visit: 02 (NGC1313-P2) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-1313-P2 COS/NUV ACQ/IMA PSA MIRRORA 1 1.2 S (1.2 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-1313-P2 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=3474.0, FP-POS=3 1 860 S G see below (1264 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-1313-P2 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=3474.0, FP-POS=4 1 945 S G see below (1378 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1313-P2 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-1313-P2 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1264.0 S G NGC-1313-P2 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1378.0 S G 17180( 2) - 29-Jun-2022 19:12:15 - [ 6] Visit: 03 (NGC1313-P3) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-1313-P3 COS/NUV ACQ/IMA PSA MIRRORA 1 2.6 S (2.6 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-1313-P3 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=4492.0, FP-POS=3 1 860 S G see below (2774 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-1313-P3 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=4492.0, FP-POS=4 1 945 S G see below (3030 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1313-P3 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-1313-P3 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2774.0 S G NGC-1313-P3 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 3030.0 S G 17180( 2) - 29-Jun-2022 19:12:15 - [ 7] Visit: 04 (NGC1313-P4) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-1313-P4 COS/NUV ACQ/IMA PSA MIRRORA 1 3.4 S (3.4 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-1313-P4 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=4567, FP-POS=3 1 860 S G see below (2772 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-1313-P4 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=4567, FP-POS=4 1 945 S G see below (3030 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1313-P4 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-1313-P4 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2772.0 S G NGC-1313-P4 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 3030.0 S G 17180( 2) - 29-Jun-2022 19:12:15 - [ 8] Visit: 05 (NGC1313-P5) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-1313-P5 COS/NUV ACQ/IMA PSA MIRRORA 1 1.5 S (1.5 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-1313-P5 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=3708, FP-POS=3 1 860 S G see below (1264 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-1313-P5 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=3708, FP-POS=4 1 945 S G see below (1378 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1313-P5 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE NGC-1313-P5 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1264.0 S G NGC-1313-P5 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 1378.0 S G 17180( 2) - 29-Jun-2022 19:12:15 - [ 9] Summary Form for Proposal 17180 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=3474.0, BUFFER-TIME=3708, BUFFER-TIME=4492.0, BUFFER-TIME=4567, BUFFER-TIME=4712, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-1313-P1, NGC-1313-P2, NGC-1313-P3, NGC-1313-P4, NGC-1313-P5 ------------------------------------------------------------------------------------------------------------------------------------