13342( 5) - 06-Aug-2013 15:06:42 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13342 Version: 5 Check-in Time: 06-Aug-2013 15:06:42 STScI Edit Number: 3 Title WARM AND HOT GASES IN AND AROUND CLUSTER GALAXIES AT Z=0.1-0.2 ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Q. Daniel Wang University of Massachusetts - Amherst Y CoI: Prof. Todd Tripp University of Massachusetts - Amherst Y ------------------------------------------------------------------------------------ Abstract We propose a joint HST/XMM-Newton observing program to study both warm and hot gases in two optically-selected galaxy clusters at z=0.117-0.2108. Each cluster has a UV-bright background QSO projected within the expected strong accretion shock (< 2r_200). We will observe UV absorption lines of the O VI doublet, HI Ly-alpha and Ly-beta, and other ion transitions in the rest frame of the clusters, using the HST/COS G130M grating. These absorption lines are sensitive to the thermal, kinetic, and chemical properties of warm (T < 10^6 K) gas, associated with the halos of individual galaxies and the intracluster medium. Chandra/ACIS observations will be used to measure the luminosity, temperature, and morphology of the hot gas component of the clusters, especially in their core regions. This joint study will thus allow us for the first time to characterize the heating/cooling and dynamic processes of these multiple gas phases in the clusters. The understanding of these processes is essential for understanding cluster galaxy evolution, the correct interpretation of X-ray and Sunyaev-Zeldovich effect measurements, and the use of clusters as cosmology probes. ------------------------------------------------------------------------------------ Observations Description ------------------------ To search for warm-hot cluster gas at log T = 5 - 7, and to generally constrain the thermal, kinetic, and chemical properties of the multiphase intracluster media (ICM), we will observe two QSOs behind the X-ray bright galaxy clusters Abell 1095 (z = 0.206) and Abell 1926 (z = 0.136) with the Cosmic Origins Spectrograph (COS) using the G130M grating. The wavelength range must cover strong resonance lines of species such as OVI, CIII, SiIII, and HI, so we will tilt the G130M grating to cover roughly 1150 to 1450 A. To fill in the chip gap, we will split the exposures (as equally as possible) between the central wavelength = 1309 A and 1327 A settings, and we will use multiple FP split positions to mitigate COS fixed-pattern noise. Both of the target QSOs have been imaged with GALEX, and we have used the GALEX ultraviolet fluxes to calculate exposure times for the target acquisitions and science exposures. In addition, both targets are point souces with accurate coordinates, so we will acquire the targets with the ACQ/IMAGE procedure. SDSS104741.75+151332.3 is marginally too bright to acquire with MIRRORA, so we will use MIRRORB for the target acquisition for this QSO to allow for possible quasar variability that could make the object too bright for MIRRORA. Real Time Justification 13342( 5) - 06-Aug-2013 15:06:42 - [ 2] ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13342( 5) - 06-Aug-2013 15:06:42 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSS104741.7 EXT-MEDIUM, ABSORPTION RA=10H47M41.7510S +/- 0.1", J2000 Z = V = 17.7 +/- 0.2 GALEX FUV = 18.20, 5+151332.3 LINE SYSTEM - DEC=+15D13'32.30" +/- 0.1" 0.3858 GALEX NUV = 18.05 EXTRAGALACTIC, CORONAL GAS, HOT GAS, ICM Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASSIJ14312 EXT-MEDIUM, ABSORPTION RA=14H31M25.8800S +/- 0.1", J2000 Z = V = 17.3 +/- 0.2 GALEX FUV = 17.59, 58+244220 LINE SYSTEM - DEC=+24D42'20.68" +/- 0.1" 0.4069 GALEX NUV = 17.28 EXTRAGALACTIC, CORONAL GAS, HOT GAS, ICM Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13342( 5) - 06-Aug-2013 15:06:42 - [ 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 SDSS104741. COS/NUV ACQ/IMA PSA MIRRORB 1 120.2 S GS ACQ SCENARIO BASE1B3 75+151332.3 GE (120.2 S) Comments: Exposure time provides S/N = 40 according to COS ETC COS.ta.509008 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSS104741. COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=4218, FP-POS=1 1 2302 S 75+151332.3 G (2302 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSS104741. COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=4218, FP-POS=3 1 2958 S 75+151332.3 G (2958 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SDSS104741. COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=4218, FP-POS=4 1 2958 S 75+151332.3 G (2958 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SDSS104741. COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=4366, FP-POS=1 1 2958 S 75+151332.3 G (2958 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SDSS104741. COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=4366, FP-POS=2 1 2958 S 75+151332.3 G (2958 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SDSS104741. COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=4366, FP-POS=4 1 2958 S 75+151332.3 G (2958 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSS104741.75+15133 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 2.3 GE SDSS104741.75+15133 2 COS/FUV TIME-TA PSA G130M 1309 none none none none 1 N/A 2.3 G SDSS104741.75+15133 3 COS/FUV TIME-TA PSA G130M 1309 none none none none 2 N/A 2.3 G SDSS104741.75+15133 4 COS/FUV TIME-TA PSA G130M 1309 none none none none 3 N/A 2.3 G SDSS104741.75+15133 5 COS/FUV TIME-TA PSA G130M 1327 none none none none 4 N/A 2.3 G SDSS104741.75+15133 6 COS/FUV TIME-TA PSA G130M 1327 none none none none 5 N/A 2.3 G 13342( 5) - 06-Aug-2013 15:06:42 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSS104741.75+15133 7 COS/FUV TIME-TA PSA G130M 1327 none none none none 6 N/A 2.3 G 13342( 5) - 06-Aug-2013 15:06:42 - [ 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 2MASSIJ1431 COS/NUV ACQ/IMA PSA MIRRORB 1 62.0 S (62 GS ACQ SCENARIO BASE1B3 258+244220 GE S) Comments: Exposure time provides S/N = 40 according to COS ETC COS.ta.509718 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASSIJ1431 COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=3548, FP-POS=1 1 2421 S 258+244220 G (2421 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASSIJ1431 COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=3548, FP-POS=3 1 2958 S 258+244220 G (2958 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASSIJ1431 COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=3548, FP-POS=4 1 2958 S 258+244220 G (2958 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 2MASSIJ1431 COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=3645, FP-POS=2 1 2958 S 258+244220 G (2958 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 2MASSIJ1431 COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=3645, FP-POS=4 1 2958 S 258+244220 G (2958 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASSIJ1431258+2442 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A 20 GE 2MASSIJ1431258+2442 2 COS/FUV TIME-TA PSA G130M 1309 none none none none 1 N/A 20 G 2MASSIJ1431258+2442 3 COS/FUV TIME-TA PSA G130M 1309 none none none none 2 N/A 20 G 2MASSIJ1431258+2442 4 COS/FUV TIME-TA PSA G130M 1309 none none none none 3 N/A 20 G 2MASSIJ1431258+2442 5 COS/FUV TIME-TA PSA G130M 1327 none none none none 4 N/A 20 G 2MASSIJ1431258+2442 6 COS/FUV TIME-TA PSA G130M 1327 none none none none 5 N/A 20 G 13342( 5) - 06-Aug-2013 15:06:42 - [ 7] Summary Form for Proposal 13342 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=3548, BUFFER-TIME=3645, BUFFER-TIME=4218, BUFFER-TIME=4366, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASSIJ1431258+244220, SDSS104741.75+151332.3 ------------------------------------------------------------------------------------------------------------------------------------