18096( 3) - 26-Aug-2025 21:47:15 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 18096 Version: 3 Check-in Time: 26-Aug-2025 21:47:15 STScI Edit Number: 0 Title COS-RAD: Where Radio Jets Meet the Halo gas ------------------------------------------------------------------------------------ Type Cycle GO 33 ------------------------------------------------------------------------------------ Investigators Contact? PI: Namrata Roy Arizona State University Y CoI: Timothy M. Heckman The Johns Hopkins University N CoI: Dr. Alaina L. Henry Space Telescope Science Institute N CoI: Dr. Kate Rowlands Space Telescope Science Institute - ESA - N JWST CoI: Dr. Sanchayeeta Borthakur Arizona State University N CoI: Prof. Rogier A. Windhorst Arizona State University N ------------------------------------------------------------------------------------ Abstract We propose COS-RAD, a 26-orbit HST/COS program to conduct the first UV absorption-line survey of the circumgalactic medium (CGM) in powerful FRII radio galaxies at z<0.6. While JWST is now exposing how radio jets disturb gas on ISM scales, COS-RAD will reveal their large (halo)-scale impact-- probing how mechanical jet-driven feedback alters the ionization, kinematics, and mass of multiphase gas in the CGM. We will observe 7 carefully selected radio galaxies using bright background quasars whose sightlines pass through the jet-inflated shocked cocoon region, aligned near the jet axis where feedback effects are strongest. Using primarily the G130M/1291 grating, we will detect the full suite of UV absorption lines, from neutral species to highly ionized tracers like OVI, capturing the CGM's thermal structure, ionization state, and gas flows. COS-RAD addresses two fundamental science goals: (1) Constrain the extent, ionization, and metal content of shocked gas in jet-inflated cocoons, and (2) Test whether radio jets dynamically disturb or accelerate CGM gas, producing distinct kinematic signatures compared to non-jetted systems. These observations will deliver the first direct, multiphase constraints on how radio-mode feedback reshapes galaxy halos, which is crucial for anchoring jet feedback models in cosmological simulations. Only HST/COS provides access to the UV diagnostics needed to probe the CGM gas across a range of ionization potentials and densities, and to uncover this hidden phase of AGN feedback. ------------------------------------------------------------------------------------ Observations Description ------------------------ We select a sample of classical FRII radio galaxies from combined FIRST+VLASS surveys, and cross matched with SDSS quasars to build a sample of background quasars with foreground radio galaxies. Radio galaxies of interest lie between 0.2 < z < 0.4 with one source at z = 0.7, and the background quasar targets are at redshifts z~0.49 to 1.33. The background quasars have GALEX FUV mags between 18.5 - 19.33. 18096( 3) - 26-Aug-2025 21:47:15 - [ 2] For the target acquisition, we ask for SN = 40 for a point source of flat continuum SED, and flux normalized by the known GALEX magnitudes of each target. we ask for MIRRORA configuration. This yields Target acquisition times of ~6 to 9 seconds. For spectroscopy of 6 out of 7 sources, we use G130M/1291 setting to cover all the key emission lines of the Radio galaxies. We require SN ~8-10 at 1250 A where most lines line, and a minimum SN > 5 at 1400 A where throughput is the lowest. Using COS ETC, we find that the required times range from 3 to 5 orbits. For the 7th source, we use G160M/1611. We request total 26 orbits to observe 7 quasar sightlines, which probes the CGM of 7 FRII radio galaxies in absorption. ------------------------------------------------------------------------------------ 18096( 3) - 26-Aug-2025 21:47:15 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 J0926 GALAXY, QSO RA=09H26M56.7103S +/- 0.1", J2000 V = 17.27 GALEX FUV (AB magnitude) = DEC=+04D16'13.19" +/- 0.1" 19.04 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 2 J0945 GALAXY, QSO RA=09H45M58.4267S +/- 0.1", J2000 V = 18.73 GALEX FUV (AB magnitude) = DEC=+13D56'50.82" +/- 0.1" 19.24 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 3 J0954 GALAXY, QSO RA=09H54M27.8196S +/- 0.1", J2000 V = 17.50 GALEX FUV (AB magnitude) = DEC=+30D19'12.96" +/- 0.1" 18.95 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 4 J1428 GALAXY, QSO RA=14H27M58.7316S +/- 0.1", J2000 V = 18.31 GALEX FUV (AB magnitude) = DEC=+32D47'41.45" +/- 0.1" 18.91 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 5 J1459 GALAXY, QSO RA=14H59M0.9869S +/- 0.1", J2000 V = 18.44 GALEX FUV (AB magnitude) = DEC=+33D19'19.85" +/- 0.1" 18.76 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 6 J1441 GALAXY, QSO RA=14H41M6.8155S +/- 0.1", J2000 V = 17.10 GALEX FUV (AB magnitude) = DEC=+57D49'39.94" +/- 0.1" 18.97 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 7 FRIISDSS GALAXY, QSO RA=09H01M19.6761S +/- 0.1", J2000 V = 18.47 GALEX FUV (AB magnitude) = DEC=+29D44'39.70" +/- 0.1" 19.33 Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 18096( 3) - 26-Aug-2025 21:47:15 - [ 4] Visit: 01 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 J0926 COS/NUV ACQ/IMA PSA MIRRORA 1 7 S (7 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 J0926 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2155 S G BUFFER-TIME=4822 (2155 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J0926 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2539 S G BUFFER-TIME=4822 (2539 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J0926 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2539 S G BUFFER-TIME=4822 (2539 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 | ------------------------------------------------------------------------------------------------------------------------------------ J0926 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE J0926 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G J0926 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A G J0926 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A G 18096( 3) - 26-Aug-2025 21:47:15 - [ 5] Visit: 02 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 J0945 COS/NUV ACQ/IMA PSA MIRRORA 1 9 S (9 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 J0945 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2145 S G BUFFER-TIME=8176 (2145 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J0945 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2530 S G BUFFER-TIME=8176 (2530 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J0945 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2530 S G BUFFER-TIME=8176 (2530 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 J0945 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2530 S G BUFFER-TIME=8176 (2530 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 J0945 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2530 S G BUFFER-TIME=8176 (2530 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 | ------------------------------------------------------------------------------------------------------------------------------------ J0945 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE J0945 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G J0945 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A G J0945 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A G J0945 5 COS/FUV TIME-TA PSA G130M 1291 none none none none 4 N/A G J0945 6 COS/FUV TIME-TA PSA G130M 1291 none none none none 5 N/A G 18096( 3) - 26-Aug-2025 21:47:15 - [ 6] Visit: 03 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 J0954 COS/NUV ACQ/IMA PSA MIRRORA 1 7 S (7 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 J0954 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2163 S G BUFFER-TIME=6536 (2163 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J0954 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2547 S G BUFFER-TIME=6536 (2547 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J0954 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2547 S G BUFFER-TIME=6536 (2547 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 J0954 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2547 S G BUFFER-TIME=6536 (2547 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 | ------------------------------------------------------------------------------------------------------------------------------------ J0954 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE J0954 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G J0954 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A G J0954 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A G J0954 5 COS/FUV TIME-TA PSA G130M 1291 none none none none 4 N/A G 18096( 3) - 26-Aug-2025 21:47:15 - [ 7] Visit: 04 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 J1428 COS/NUV ACQ/IMA PSA MIRRORA 1 6 S (6 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 J1428 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2165 S G BUFFER-TIME=4839 (2165 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J1428 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2547 S G BUFFER-TIME=4839 (2547 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J1428 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2547 S G BUFFER-TIME=4839 (2547 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 | ------------------------------------------------------------------------------------------------------------------------------------ J1428 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE J1428 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G J1428 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A G J1428 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A G 18096( 3) - 26-Aug-2025 21:47:15 - [ 8] Visit: 05 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 J1459 COS/NUV ACQ/IMA PSA MIRRORA 1 6 S (6 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 J1459 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2165 S G BUFFER-TIME=4839 (2165 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J1459 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2547 S G BUFFER-TIME=4839 (2547 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J1459 COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2547 S G BUFFER-TIME=4839 (2547 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 | ------------------------------------------------------------------------------------------------------------------------------------ J1459 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE J1459 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G J1459 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A G J1459 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A G 18096( 3) - 26-Aug-2025 21:47:15 - [ 9] Visit: 06 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 J1441 COS/NUV ACQ/IMA PSA MIRRORA 1 8 S (8 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 J1441 COS/FUV TIME-TA PSA G160M 1611 SEGMENT=BOTH, FP-POS=1, 1 1085 S G BUFFER-TIME=4946 (1085 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 J1441 COS/FUV TIME-TA PSA G160M 1611 SEGMENT=BOTH, FP-POS=2, 1 1085 S G BUFFER-TIME=4946 (1085 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 J1441 COS/FUV TIME-TA PSA G160M 1611 SEGMENT=BOTH, FP-POS=3, 1 2600 S G BUFFER-TIME=4946 (2600 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 J1441 COS/FUV TIME-TA PSA G160M 1611 SEGMENT=BOTH, FP-POS=4, 1 2600 S G BUFFER-TIME=4946 (2600 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 | ------------------------------------------------------------------------------------------------------------------------------------ J1441 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE J1441 2 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G J1441 3 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G J1441 4 COS/FUV TIME-TA PSA G160M 1611 none none none none 2 N/A G J1441 5 COS/FUV TIME-TA PSA G160M 1611 none none none none 3 N/A G 18096( 3) - 26-Aug-2025 21:47:15 - [ 10] Visit: 07 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 FRIISDSS COS/NUV ACQ/IMA PSA MIRRORA 1 9 S (9 S) GE ------------------------------------------------------------------------------------------------------------------------------------ 2 FRIISDSS COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2155 S G BUFFER-TIME=8210 (2155 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 FRIISDSS COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=3, 1 2540 S G BUFFER-TIME=8210 (2540 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 FRIISDSS COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2543 S G BUFFER-TIME=8210 (2543 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 FRIISDSS COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2543 S G BUFFER-TIME=8210 (2543 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 FRIISDSS COS/FUV TIME-TA PSA G130M 1291 SEGMENT=BOTH, FP-POS=4, 1 2543 S G BUFFER-TIME=8210 (2543 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 | ------------------------------------------------------------------------------------------------------------------------------------ FRIISDSS 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A GE FRIISDSS 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G FRIISDSS 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 N/A G FRIISDSS 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 N/A G FRIISDSS 5 COS/FUV TIME-TA PSA G130M 1291 none none none none 4 N/A G FRIISDSS 6 COS/FUV TIME-TA PSA G130M 1291 none none none none 5 N/A G 18096( 3) - 26-Aug-2025 21:47:15 - [ 11] Summary Form for Proposal 18096 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=4822, BUFFER-TIME=4839, BUFFER-TIME=4946, BUFFER-TIME=6536, BUFFER-TIME=8176, BUFFER-TIME=8210, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G160M, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names FRIISDSS, J0926, J0945, J0954, J1428, J1441, J1459 ------------------------------------------------------------------------------------------------------------------------------------