17821( 4) - 26-Mar-2026 18:31:50 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17821 Version: 4 Check-in Time: 26-Mar-2026 18:31:50 STScI Edit Number: 0 Title Anatomy of a Starburst: Spatially resolving Star Formation and Feedback in the nucleus of M83 ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Svea S Hernandez Space Telescope Science Institute - ESA - Y JWST CoI: Dr. Linda J. Smith Space Telescope Science Institute N CoI: Dr. Logan H Jones Space Telescope Science Institute N CoI: Dr. Claus Leitherer Space Telescope Science Institute N CoI: Dr. Aditya Togi Texas State University N CoI: Prof. Aida Wofford National Autonomous University of Mexico N ------------------------------------------------------------------------------------ Abstract Given that most of the stellar mass in the Universe was assembled in intense and powerful episodes of star formation (SF) at high-redshift, studies of local starburst galaxies provide us with the unique opportunity to investigate in detail a phenomenon with profound cosmic consequences. FUV spectroscopic studies, available only through the unmatched UV capabilities of HST, are the only venue to access a complete characterization of these young stellar populations formed in nearby highly star-forming galaxies. In an effort to improve our understanding on (1) the parameters that regulate galaxy evolution, (2) the link between pc-scale physics and galactic-scale mechanisms, and (3) the direct effects of young stellar populations onto their surrounding multiphase ISM, we propose a unique spatially-resolved HST/STIS longslit study of 15 young massive clusters in the nuclear region of M83. With this program we aim to quantify for the first time the effects of these young stars, shaping the properties of the gas in extreme environments like those observed in starbursts. Our program will correlate the ionizing and mechanical feedback from these massive stellar populations with the observed properties of the ionized and warm molecular gas (from archival JWST/MIRI MRS observations) at the unprecedented spatial scales of ~5 pc. Our efficient project will take us one step forward to probing how young massive stars impact and influence galaxy evolution, and star formation at large. ------------------------------------------------------------------------------------ Observations Description ------------------------ This HST/STIS program targets a sample of young massive clusters in the nuclear reagion of the spiral galaxy, M83. We use the G140L/52X0.2 setting to collect spectra for 10 spatially resolved star clusters. Given the nature of the starbust region in M83, in each visit we acquire the bright young star cluster in the south-east region of the nucleus, and then apply an offset to the brightest target of interest in the STIS slit. The sample of star clusters was chosen from the photometric catalog by Harris et al. (2001). We note that in each visit, we taken exposures with a single slit orientation, targeting between 2 and 4 clusters at a time. 17821( 4) - 26-Mar-2026 18:31:50 - [ 2] The exposure times were estimated adopting a flat spectrum in F_lambda, normalized to the magnitudes estimated for the brightest cluster according to Harris et al. (2001). Our observations reach a S/N~> 6 at a wavelength of 1550 A (C IV). ------------------------------------------------------------------------------------ 17821( 4) - 26-Mar-2026 18:31:50 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M83-P1 GALAXY, STARBURST RA=13H37M0.8424S, J2000 V = 18.25 +/- 0.01 DEC=-29D52'2.99" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 2 M83-P2 GALAXY, STARBURST RA-OFF=-0.0011537D, J2000 V = 16.69 +/- 0.01 DEC-OFF=+0.0004263999D, FROM 1 Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-P3 GALAXY, STARBURST RA-OFF=-0.0017445999999D, J2000 V = 17.33 +/- 0.01 DEC-OFF=+0.00083469999999D, FROM 1 Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 4 M83-P4 GALAXY, STARBURST RA-OFF=-0.0015000000D, J2000 V = 16.68 +/- 0.01 DEC-OFF=+0.0022179999999D, FROM 1 Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 17821( 4) - 26-Mar-2026 18:31:50 - [ 4] Visit: 01 Visit Requirements: ORIENT 320D TO 321 D 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 M83-P1 STIS/CCD ACQ 50CCD MIRROR 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M83-P1 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 2000 S -MAMA G see below (2048 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M83-P1 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 2000 S -MAMA G see below (2624 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 M83-P1 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 2000 S -MAMA G see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-P1 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A M83-P1 2 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 1 2048.0 S -MAMA G M83-P1 3 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 2 2624.0 S -MAMA G M83-P1 4 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 3 2624.0 S -MAMA G 17821( 4) - 26-Mar-2026 18:31:50 - [ 5] Visit: 02 Visit Requirements: ORIENT 300D TO 301 D 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 M83-P1 STIS/CCD ACQ 50CCD MIRROR 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M83-P2 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 2000 S -MAMA G see below (2048 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-P1 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A M83-P2 2 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 1 2048.0 S -MAMA G 17821( 4) - 26-Mar-2026 18:31:50 - [ 6] Visit: 03 Visit Requirements: ORIENT 325D TO 326 D 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 M83-P1 STIS/CCD ACQ 50CCD MIRROR 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M83-P3 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 1000 S -MAMA G see below (2048 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-P1 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A M83-P3 2 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 1 2048.0 S -MAMA G 17821( 4) - 26-Mar-2026 18:31:50 - [ 7] Visit: 04 Visit Requirements: SCHED 100%; ORIENT 280D TO 281 D 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 M83-P1 STIS/CCD ACQ 50CCD MIRROR 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M83-P4 STIS/FUV TIME-TA 52X0.2D1 G140L 1425 BUFFER-TIME=2000 1 2000 S -MAMA G see below (1926 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-P1 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A M83-P4 2 STIS/FUV TIME-TA 52X0.2D1 G140L 1425 none none none none 1 1926.0 S -MAMA G 17821( 4) - 26-Mar-2026 18:31:50 - [ 8] Visit: 05 Visit Requirements: ORIENT 312D TO 317 D 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 M83-P1 STIS/CCD ACQ 50CCD MIRROR 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M83-P3 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 1000 S -MAMA G see below (1999 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 | ------------------------------------------------------------------------------------------------------------------------------------ M83-P1 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A M83-P3 2 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 1 1999.0 S -MAMA G 17821( 4) - 26-Mar-2026 18:31:50 - [ 9] Summary Form for Proposal 17821 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 50CCD, 52X0.2, 52X0.2D1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=2000 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 280D TO 281 D, ORIENT 300D TO 301 D, ORIENT 312D TO 317 D, ORIENT 320D TO 321 D, ORIENT 325D TO 326 D, SCHED 100% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names M83-P1, M83-P2, M83-P3, M83-P4 ------------------------------------------------------------------------------------------------------------------------------------