12271( 4) - 16-Dec-2010 15:15:00 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12271 Version: 4 Check-in Time: 16-Dec-2010 15:15:00 STScI Edit Number: 2 Title Probing the Physics of Gas in Cool Core Clusters: Virgo ------------------------------------------------------------------------------------ Type Cycle GO 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. William B. Sparks Space Telescope Science Institute CoI: Dr. Megan Donahue Michigan State University N CoI: Dr. James E. Pringle University of Cambridge N CoI: Dr. Robert F. Carswell University of Cambridge N CoI: Prof. Mark Voit Michigan State University N CoI: Dr. Rebecca G. Martin Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract We recently detected high temperature gas at 10^5K associated with the low excitation 10^4K line emission filaments of M87. This is a profoundly important observation bearing on the physics of transport processes in cool core clusters. We propose to delve deeper into the physics of cool core clusters. We propose to use ACS to compare the spatial extent and morphology of the low and high temperature gas, to use the timely presence of COS to obtain a sensitive FUV spectrum of the hot gas, and, by introducing the notion of emission line polarimetry, seek a a potentially revolutionary new plasma diagnostic. The spatial distributions will reveal whether the hotter material is more spatially extended than the cooler; the FUV spectrum will permit derivation of the emission measure (essentially amount of gas) at each temperature between the 10^4K Halpha filaments and coronal gas at 10^7K. Together these strongly constrain plausible transport processes relating the hot and cool gas phases in this cool core cluster region, and hence the dominant physical processes at work. A novel ingredient is to obtain the optical images in polarimetric mode to probe emission line polarization levels, a diagnostic used in Solar physics to determine the relevance of collisional excitation processes such as electron impact polarization in thermal conduction or shocks. With this suite of straightforward, uniquely HST observations we may dramatically change the landscape of our understanding of the physics of cool core clusters ------------------------------------------------------------------------------------ Observations Description ------------------------ We will image the emission filaments using the F50LP SBC and F656N optical narrow band filter together with polarizing filters. We will also acquire COS spectroscopy in the FUV. Real Time Justification ----------------------- Calibration Justification ------------------------- 12271( 4) - 16-Dec-2010 15:15:00 - [ 2] Additional Comments ------------------- ------------------------------------------------------------------------------------ 12271( 4) - 16-Dec-2010 15:15:00 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M87-FILAMENT CLUSTER OF GALAXIES, RA=12H30M49.6100S +/- 0.1", J2000 V = 16.7 +/- 0.5 mag given is nucleus S-WFC CONDUCTION FRONT, DEC=+12D23'26.32" +/- 0.1" COOLING FLOW, EMISSION LINE NEBULA, FILAMENT Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 5 M87-FILAMENT CLUSTER OF GALAXIES, RA=12H30M51.0000S +/- 0.1", J2000 V = 16.7 +/- 0.5 mag given is nucleus S-SBC CONDUCTION FRONT, DEC=+12D23'19.00" +/- 0.1" COOLING FLOW, EMISSION LINE NEBULA, FILAMENT Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 3 M87-FILAMENT CLUSTER OF GALAXIES, RA=12H30M50.9900S +/- 0.1", J2000 V = 16.7 +/- 0.5 mag given is nucleus S-COS CONDUCTION FRONT, DEC=+12D23'25.50" +/- 0.1" COOLING FLOW, EMISSION LINE NEBULA, FILAMENT Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 4 M87-FILAMENT GALAXY, RADIO GALAXY RA=12H30M49.4230S +/- 0.1", J2000 V = 16 S-COS-OFFSET DEC=+12D23'28.04" +/- 0.1" Reference Frame: ICRS Comments: This is the position of the nucleus of M87 ------------------------------------------------------------------------------------------------------------------------------------ 12271( 4) - 16-Dec-2010 15:15:00 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-SBC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.472 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 44.4 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12271( 4) - 16-Dec-2010 15:15:00 - [ 5] Visit: 01 Visit Requirements: PCS MODE FINE 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M87-FILAMEN ACS/SBC ACCUM SBC-FIX F150LP 1 1200 S PATTERN 1 1 TS-SBC see below ------------------------------------------------------------------------------------------------------------------------------------ 2 M87-FILAMEN ACS/SBC ACCUM SBC-FIX F150LP 1 1250 S POS TARG 0.0, 0.5; TS-SBC see below PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 M87-FILAMEN ACS/SBC ACCUM SBC-FIX F150LP 1 1250 S POS TARG 0.5, 0.5; TS-SBC see below PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 M87-FILAMEN ACS/SBC ACCUM SBC-FIX F150LP 1 1250 S POS TARG 0.5, 0.0; TS-SBC see below PATTERN 1 4 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M87-FILAMENTS-SBC 1 ACS/SBC ACCUM SBC-FIX F150LP 1 none none none 1 1385.0 S M87-FILAMENTS-SBC 1 ACS/SBC ACCUM SBC-FIX F150LP 2 none none none 1 1385.0 S M87-FILAMENTS-SBC 2 ACS/SBC ACCUM SBC-FIX F150LP 1 none none none 2 1461.0 S M87-FILAMENTS-SBC 2 ACS/SBC ACCUM SBC-FIX F150LP 2 none none none 2 1461.0 S M87-FILAMENTS-SBC 3 ACS/SBC ACCUM SBC-FIX F150LP 1 none none none 3 1461.0 S M87-FILAMENTS-SBC 3 ACS/SBC ACCUM SBC-FIX F150LP 2 none none none 3 1461.0 S M87-FILAMENTS-SBC 4 ACS/SBC ACCUM SBC-FIX F150LP 1 none none none 4 1461.0 S M87-FILAMENTS-SBC 4 ACS/SBC ACCUM SBC-FIX F150LP 2 none none none 4 1461.0 S 12271( 4) - 16-Dec-2010 15:15:00 - [ 6] 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 740 S TS-WFC POL0UV ------------------------------------------------------------------------------------------------------------------------------------ 2 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 740 S TS-WFC POL60UV ------------------------------------------------------------------------------------------------------------------------------------ 3 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 740 S TS-WFC POL120UV ------------------------------------------------------------------------------------------------------------------------------------ 4 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 785 S POS TARG 0.247, 0.094 TS-WFC POL0UV ------------------------------------------------------------------------------------------------------------------------------------ 5 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 785 S POS TARG 0.247, 0.094 TS-WFC POL60UV ------------------------------------------------------------------------------------------------------------------------------------ 6 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 785 S POS TARG 0.247, 0.094 TS-WFC POL120UV ------------------------------------------------------------------------------------------------------------------------------------ 7 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 785 S POS TARG 0.124, 0.232 TS-WFC POL0UV ------------------------------------------------------------------------------------------------------------------------------------ 8 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 785 S POS TARG 0.124, 0.232 TS-WFC POL60UV ------------------------------------------------------------------------------------------------------------------------------------ 9 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 785 S POS TARG 0.124, 0.232 TS-WFC POL120UV ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M87-FILAMENTS-WFC 1 ACS/WFC ACCUM WFC F660N, none none none none 1 N/A POL0UV M87-FILAMENTS-WFC 2 ACS/WFC ACCUM WFC F660N, none none none none 1 N/A POL60UV M87-FILAMENTS-WFC 3 ACS/WFC ACCUM WFC F660N, none none none none 1 N/A POL120UV M87-FILAMENTS-WFC 4 ACS/WFC ACCUM WFC F660N, none none none none 2 N/A POL0UV 12271( 4) - 16-Dec-2010 15:15:00 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ M87-FILAMENTS-WFC 5 ACS/WFC ACCUM WFC F660N, none none none none 2 N/A POL60UV M87-FILAMENTS-WFC 6 ACS/WFC ACCUM WFC F660N, none none none none 2 N/A POL120UV M87-FILAMENTS-WFC 7 ACS/WFC ACCUM WFC F660N, none none none none 3 N/A POL0UV M87-FILAMENTS-WFC 8 ACS/WFC ACCUM WFC F660N, none none none none 3 N/A POL60UV M87-FILAMENTS-WFC 9 ACS/WFC ACCUM WFC F660N, none none none none 3 N/A POL120UV 12271( 4) - 16-Dec-2010 15:15:00 - [ 8] 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 730 S POS TARG -0.124, 0.138 TS-WFC POL0UV ------------------------------------------------------------------------------------------------------------------------------------ 2 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 730 S POS TARG -0.124, 0.138 TS-WFC POL60UV ------------------------------------------------------------------------------------------------------------------------------------ 3 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 730 S POS TARG -0.124, 0.138 TS-WFC POL120UV ------------------------------------------------------------------------------------------------------------------------------------ 4 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 800 S TS-WFC POL0UV ------------------------------------------------------------------------------------------------------------------------------------ 5 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 800 S TS-WFC POL60UV ------------------------------------------------------------------------------------------------------------------------------------ 6 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 800 S TS-WFC POL120UV ------------------------------------------------------------------------------------------------------------------------------------ 7 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 785 S POS TARG 0.247, 0.094 TS-WFC POL0UV ------------------------------------------------------------------------------------------------------------------------------------ 8 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 785 S POS TARG 0.247, 0.094 TS-WFC POL60UV ------------------------------------------------------------------------------------------------------------------------------------ 9 M87-FILAMEN ACS/WFC ACCUM WFC F660N, 1 785 S POS TARG 0.247, 0.094 TS-WFC POL120UV ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M87-FILAMENTS-WFC 1 ACS/WFC ACCUM WFC F660N, none none none none 1 N/A POL0UV M87-FILAMENTS-WFC 2 ACS/WFC ACCUM WFC F660N, none none none none 1 N/A POL60UV M87-FILAMENTS-WFC 3 ACS/WFC ACCUM WFC F660N, none none none none 1 N/A POL120UV M87-FILAMENTS-WFC 4 ACS/WFC ACCUM WFC F660N, none none none none 2 N/A POL0UV 12271( 4) - 16-Dec-2010 15:15:00 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ M87-FILAMENTS-WFC 5 ACS/WFC ACCUM WFC F660N, none none none none 2 N/A POL60UV M87-FILAMENTS-WFC 6 ACS/WFC ACCUM WFC F660N, none none none none 2 N/A POL120UV M87-FILAMENTS-WFC 7 ACS/WFC ACCUM WFC F660N, none none none none 3 N/A POL0UV M87-FILAMENTS-WFC 8 ACS/WFC ACCUM WFC F660N, none none none none 3 N/A POL60UV M87-FILAMENTS-WFC 9 ACS/WFC ACCUM WFC F660N, none none none none 3 N/A POL120UV 12271( 4) - 16-Dec-2010 15:15:00 - [ 10] 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M87-FILAMEN COS/NUV ACQ/IMA PSA MIRRORB 1 100 S TS-COS-OFFS GE ET ------------------------------------------------------------------------------------------------------------------------------------ 2 M87-FILAMEN COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1100, FLASH=YES, 1 1200 S TS-COS G FP-POS=3, EXTENDED=YES see below ------------------------------------------------------------------------------------------------------------------------------------ 3 M87-FILAMEN COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1150, FLASH=YES, 1 1250 S TS-COS G FP-POS=3, EXTENDED=YES see below ------------------------------------------------------------------------------------------------------------------------------------ 4 M87-FILAMEN COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1300, FLASH=YES, 1 1400 S TS-COS G EXTENDED=YES, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ 5 M87-FILAMEN COS/FUV TIME-TA PSA G140L 1280 BUFFER-TIME=1350, FLASH=YES, 1 1450 S TS-COS G EXTENDED=YES, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M87-FILAMENTS-COS-O 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A FFSET GE M87-FILAMENTS-COS 2 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 1062.0 S G M87-FILAMENTS-COS 3 COS/FUV TIME-TA PSA G140L 1280 none none none none 1 1112.0 S G M87-FILAMENTS-COS 4 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 N/A G M87-FILAMENTS-COS 5 COS/FUV TIME-TA PSA G140L 1280 none none none none 2 N/A G 12271( 4) - 16-Dec-2010 15:15:00 - [ 11] Summary Form for Proposal 12271 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA, SBC-FIX, WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/SBC, ACS/WFC, COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1100, BUFFER-TIME=1150, BUFFER-TIME=1300, BUFFER-TIME=1350, EXTENDED=YES, FLASH=YES, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2, PATTERN 1 3, PATTERN 1 4, PCS MODE FINE, POS TARG -0.124, 0.138, POS TARG 0.0, 0.5, POS TARG 0.124, 0.232, POS TARG 0.247, 0.094, POS TARG 0.5, 0.0, POS TARG 0.5, 0.5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F150LP, F660N, G140L, MIRRORB, POL0UV, POL120UV, POL60UV ------------------------------------------------------------------------------------------------------------------------------------ Target Names M87-FILAMENTS-COS, M87-FILAMENTS-COS-OFFSET, M87-FILAMENTS-SBC, M87-FILAMENTS-WFC ------------------------------------------------------------------------------------------------------------------------------------