16297( 2) - 24-Jun-2020 16:09:12 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16297 Version: 2 Check-in Time: 24-Jun-2020 16:09:12 STScI Edit Number: 1 Title Catching radio-mode feedback in action with COS UV absorption spectroscopy ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Ting-Wen Lan University of California - Santa Cruz Y CoI: Dr. Jason X. Prochaska University of California - Santa Cruz N ------------------------------------------------------------------------------------ Abstract A widely accepted tenant of galaxy formation theory is that red-and-dead galaxies maintain their quiescent status through the sustained impact of radio-mode feedback. Driven by an active galactic nucleus, this feedback is purported to heat gas in the galaxy's surroundings to prevent the accretion and cooling of gas onto the galaxy. Moreover, radio-mode feedback drives gas outflows and may remove a substantive amount of gas from galaxies. While radio-mode feedback is now a nearly generic feature of numerical simulations of galaxy formation, the physical mechanisms that drive the interaction between radio jets/lobes and gas in galaxies are still poorly known. With this proposal, we will study a galaxy with bright radio jets (i.e. caught in the act) and therefore putatively exhibiting the radio-mode feedback that sustains its absence of star formation. Fortuitously, a UV luminous quasar lies background to this galaxy with its sightline intersecting the system at an impact parameter R ~ 4 kpc. Existing optical spectra of the quasar shows likely CaII absorption associated with the foreground galaxy, i.e. cool and dense gas. The proposed HST/COS observations will extend the analysis to a diverse set of diagnostics -- HI Lya, OI, SiII, SiIII, SiIV, CII, CIV -- to assess the metallicity, kinematics, and multi-phase nature of gas in the galaxy. These data will provide direct insight into the process of radio-mode feedback and offer tests for current and future models. ------------------------------------------------------------------------------------ Observations Description ------------------------ This observation is designed to obtain COS FUV spectra of a background quasar (z=0.2, FUV=18.3 mag) for probing multiple ISM absorption lines of the targeted foreground galaxy (z=0.0734). We will use two COS FUV settings, 130M (1291 A) and 160 M(1533 A), to obtain the required wavelength coverage for the targeted lines including HI Lya 1215, SII 1250, 1253, OI 1302, SiII 1260/1304, SiIII 1206, SiIV 1393/1402, CII 1334, and CIV 1548/1550. The COS FUV settings are designed to follow the COS 2025 policy and to maximize the wavelength coverage for the science at the same time. The total exposure times are chosen to obtain spectra with the two settings both having S/N>10, which results ~11, 000 s for 130 M (1291 A) and ~9, 100 160 M (1533 A). 16297( 2) - 24-Jun-2020 16:09:12 - [ 2] The corresponding ETC calculations can be found at 130M [http://etc.stsci.edu/etc/results/COS.sa.1448703/](http://etc.stsci.edu/etc/res ults/COS.sa.1448703/) 160M [http://etc.stsci.edu/etc/results/COS.sa.1423410/](http://etc.stsci.edu/etc/res ults/COS.sa.1423410/) Following the suggested visit design, we structure our 8 orbits into three visits (3, 3, 2). - 1st visit focuses on obtaining spectra with 130 M (1291 A): 1 orbit - Target acquisition [NUV MIRRORA imaging] + FUV 130M [1291 A] exposure (2436 s) 2 orbit - FUV 130M [1291 A] exposure (2689 s) 3 orbit - FUV 130M [1291 A] exposure (2689 s) - 2nd visit focuses on obtaining spectra with 160M (1533 A): 1 orbit - Target acquisition [NUV MIRRORA imaging] + FUV 160M [1533 A] exposure (2383 s) 2 orbit - FUV 160M [1533 A] exposure (2689 s) 3 orbit - FUV 160M [1533 A] exposure (2689 s) - 3rd visit will obtain spectra with both settings 130M (1291 A) and 160M (1533 A): 1 orbit - Target acquisition [NUV MIRRORA imaging] + FUV 130M [1291 A] exposure (2436 s) 2 orbit - FUV 130M [1291 A] exposure (966 s) + FUV 160M [1533 A] exposure (1485 s) The final science exposure time are 11216 for 130M (1291 A) and 9246 s for 160M (1533A), consistent with the original plan. ------------------------------------------------------------------------------------ 16297( 2) - 24-Jun-2020 16:09:12 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GALEX-J11071 ISM, ABSORPTION LINE RA=11H07M17.7864S +/- 0.1", J2000 V = 18.29537 +/- 0.09 Magnitude is FUV 7.7+080438 SYSTEM, ABSORPTION LINE DEC=+08D04'38.10" +/- 0.1" SYSTEM - EXTRAGALACTIC Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the GALEX database. ------------------------------------------------------------------------------------------------------------------------------------ 16297( 2) - 24-Jun-2020 16:09:12 - [ 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 GALEX-J1107 COS/NUV ACQ/IMA PSA MIRRORA 1 2 S (2 S) 17.7+080438 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 GALEX-J1107 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, SEGMENT=BOTH, 1 2500 S 17.7+080438 G BUFFER-TIME=4522 see below (2436 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 GALEX-J1107 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=4522, FP-POS=4, 1 2800 S 17.7+080438 G SEGMENT=BOTH see below (2689 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GALEX-J1107 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=4522, FP-POS=3, 1 2800 S 17.7+080438 G SEGMENT=BOTH see below (2689 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 | ------------------------------------------------------------------------------------------------------------------------------------ GALEX-J110717.7+080 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 438 GE GALEX-J110717.7+080 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2436.0 S 438 G GALEX-J110717.7+080 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 2689.0 S 438 G GALEX-J110717.7+080 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 3 2689.0 S 438 G 16297( 2) - 24-Jun-2020 16:09:12 - [ 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 GALEX-J1107 COS/NUV ACQ/IMA PSA MIRRORA 1 2 S (2 S) 17.7+080438 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 GALEX-J1107 COS/FUV TIME-TA PSA G160M 1533 FP-POS=2, SEGMENT=BOTH, 1 2500 S 17.7+080438 G BUFFER-TIME=11872 see below (2383 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 GALEX-J1107 COS/FUV TIME-TA PSA G160M 1533 FP-POS=3, SEGMENT=BOTH, 1 3000 S 17.7+080438 G BUFFER-TIME=11872 see below (2689 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GALEX-J1107 COS/FUV TIME-TA PSA G160M 1533 FP-POS=4, SEGMENT=BOTH, 1 3000 S 17.7+080438 G BUFFER-TIME=11872 see below (2689 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 | ------------------------------------------------------------------------------------------------------------------------------------ GALEX-J110717.7+080 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 438 GE GALEX-J110717.7+080 2 COS/FUV TIME-TA PSA G160M 1533 none none none none 1 2383.0 S 438 G GALEX-J110717.7+080 3 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 2689.0 S 438 G GALEX-J110717.7+080 4 COS/FUV TIME-TA PSA G160M 1533 none none none none 3 2689.0 S 438 G 16297( 2) - 24-Jun-2020 16:09:12 - [ 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 GALEX-J1107 COS/NUV ACQ/IMA PSA MIRRORA 1 2 S (2 S) 17.7+080438 GE ------------------------------------------------------------------------------------------------------------------------------------ 2 GALEX-J1107 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, SEGMENT=BOTH, 1 2500 S 17.7+080438 G BUFFER-TIME=4522 see below (2436 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 GALEX-J1107 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=4522, FP-POS=3, 1 982 S 17.7+080438 G SEGMENT=BOTH see below (966 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GALEX-J1107 COS/FUV TIME-TA PSA G160M 1533 FP-POS=1, SEGMENT=BOTH, 1 1501 S 17.7+080438 G BUFFER-TIME=11872 see below (1485 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 | ------------------------------------------------------------------------------------------------------------------------------------ GALEX-J110717.7+080 1 COS/NUV ACQ/IMA PSA MIRRORA none none none none 1 N/A 438 GE GALEX-J110717.7+080 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 2436.0 S 438 G GALEX-J110717.7+080 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 2 966.0 S 438 G GALEX-J110717.7+080 4 COS/FUV TIME-TA PSA G160M 1533 none none none none 2 1485.0 S 438 G 16297( 2) - 24-Jun-2020 16:09:12 - [ 7] Summary Form for Proposal 16297 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=11872, BUFFER-TIME=4522, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G160M, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names GALEX-J110717.7+080438 ------------------------------------------------------------------------------------------------------------------------------------