5921( 8) - 02/03/97 14:45 - [ 0] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5921 Version: 8 Check-in Date: 03-Feb-1997 14:42:30 1.Proposal Title: FOS Observations of Ionized Gas in Two Early-Type Galaxies ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Galaxies & Clusters GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Claude Canizares Massachusetts Institute of Technology CoI: Kenneth Sembach Massachusetts Institute of Technology Y CoI: Giuseppina Fabbiano Harvard Smithsonian Center for N Astrophysics ------------------------------------------------------------------------------------ 6. Abstract We will obtain Faint Object Spectrograph G130H (1150--1600 Angstrom) spectra of NGC 4472 (M49) and NGC 4486 (M87) to determine the amount of intermediate temperature (~10^5 K) gas in the cooling flows and interstellar media of these early -type galaxies. Both galaxies have large amounts of hot (~10^7 K) gas, and NGC 4486 has a strong cooling flow associated with the Virgo cluster. NGC 4472 is a relatively isolated Virgo elliptical with a galactic cooling flow. Intermediate ionization gas traced by species such as Si IV, C IV, and N V is common in the Milky Way and QSO absorption line systems and should be present in early-type galaxies as well given their large hot gas content and apparently complex ISM. The proposed observations will have resolutions of approximately 200 km/sec and S/N = 15 (NGC 4472) and 35 (NGC 4486). By combining the FOS observations with spectral information at X-ray wavelengths from the ASCA satellite, we will be able to study the gas-phase conditions in these galaxies over a wide range of temperatures (~10^4-10^7 K). ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe NGC 4472 and NGC 4486 in FOS high-resolution mode using the G130H grating. The observations will have a resolution of approximately 200 km/sec (FWHM) at 1500 Angstroms and S/N = 15 (NGC 4472) and 35 (NGC 4486) per resolution element (1 diode). The FOS observations will be obtained in the 0.2"x1.7" slit aperture to preserve the full spectroscopic resolution provided by the aperture with COSTAR optics (FWHM=0.99+/-0.1 Angstroms/diode). The integration for each object will provide full spectral coverage over the wavelength interval from 1150 to 1606 A. The data will be obtained in ACCUM mode. Fluxes are estimated from Oke, Bertola, & Capaccioli (1981, ApJ, 243, 453). No previous exposures of these objects at these wavelengths exist in the HST archives. Due to the factor of 2 error in the exposure time calculation process given in the FOS instrument handbook (Version 5.0), we have decided to concentrate our awarded time solely on the brighter of the two objects (NGC 4486). Two visits will be required. Real Time Justification ----------------------- No special scheduling requirements are necessary. Calibration Justification ------------------------- No special scheduling requirements are necessary. Additional Comments ------------------- No additional comments at this time. ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: Kenneth Sembach*The Johns Hopkins University*Department of Physics & Astronomy*Bloomberg Center*Baltimore MD 21218 Ship Via: Email: sembach@profuse.pha.jhu.edu , ------------------------------------------------------------------------------------ 5921( 8) - 02/03/97 14:45 - [ 1] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4486 GALAXY, ELLIPTICAL RA=12H 30M 49.3982S +/- 0.005S, 2000.0 V = SURF(V) = 16.7 DEC=+12D 23' 26.576" +/- 0.05", +1260 F-LINE(5007)=6.6+/-0.5e-16 PLATE-ID=00IY F-LINE(6584)=1.1+/-0.2e-15 F-CONT(5000)=5.0+/-0.2e-16 F-CONT(3000)=8.0+/-2.0e-16 F-CONT(1550)=7.2+/-0.2e-15 Comments: UV (1550) flux from Oke et al (1981) - IUE. All other fluxes from Harms et al (1994, ApJ, 435, L35) or Ford et al (1994, ApJ, 435, L27) 2 M87 GALAXY, ELLIPTICAL RA=12H 30M 49.4286S +/- 0.03", 2000.0 V = SURF(V) = 16.7 DEC=+12D 23' 27.985" +/- 0.03", +1260 F-LINE(5007)=6.6+/-0.5e-16 PLATE-ID=00IY F-LINE(6584)=1.1+/-0.2e-15 F-CONT(5000)=5.0+/-0.2e-16 F-CONT(3000)=8.0+/-2.0e-16 F-CONT(1550)=7.2+/-0.2e-15 Comments: UV (1550) flux from Oke et al (1981) - IUE. All other fluxes from Harms et al (1994, ApJ, 435, L35) or Ford et al (1994, ApJ, 435, L27). Coords are from Ford's successful FOS M87 programs for this HOPR repeat. 5921( 8) - 02/03/97 14:45 - [ 2] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Number exposures beginning with 010. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC4486 FOS/BL ACQ/BIN 4.3 MIRROR FAINT=1320.,BRIGHT=660000. 1 25 S ONBOARD ACQ FOR 020 ARY Comments: First acquire object in 4.3 aperture. Bright and faint limits recommended by FOS team on basis of previous NGC4486 observations with FOS/RD. ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC4486 FOS/BL ACQ/PEA 0.3 MIRROR SCAN-STEP-X=0.17,SCAN-STEP-Y=0.17 1 10 S ONBOARD ACQ FOR 030 K ,SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3 Comments: Peak up in 0.3 aperture (proper x,y centering). ------------------------------------------------------------------------------------------------------------------------------------ 30 NGC4486 FOS/BL ACQ/PEA 0.25X2. MIRROR SCAN-STEP-X=0.17,SEARCH-SIZE-X=9, 1 10 S ONBOARD ACQ FOR 040 K 0 SEARCH-SIZE-Y=1 Comments: Peak up in slit. Acquisition fits in 1 orbit. ------------------------------------------------------------------------------------------------------------------------------------ 40 NGC4486 FOS/BL ACCUM 0.25X2. G130H 1 200 M 0 Comments: Science exposure for 1st visit. ------------------------------------------------------------------------------------------------------------------------------------ 5921( 8) - 02/03/97 14:45 - [ 3] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: Number exposures beginning with 110. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 110 NGC4486 FOS/BL ACQ/BIN 4.3 MIRROR FAINT=1320.,BRIGHT=660000. 1 25 S ONBOARD ACQ FOR 120 ARY Comments: First acquire object in 4.3 aperture. ------------------------------------------------------------------------------------------------------------------------------------ 120 NGC4486 FOS/BL ACQ/PEA 0.3 MIRROR SCAN-STEP-X=0.17,SCAN-STEP-Y=0.17 1 10 S ONBOARD ACQ FOR 130 K ,SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3 Comments: Peak up in 0.3 aperture (proper x,y centering). ------------------------------------------------------------------------------------------------------------------------------------ 130 NGC4486 FOS/BL ACQ/PEA 0.25X2. MIRROR SCAN-STEP-X=0.17,SEARCH-SIZE-X=9, 1 10 S ONBOARD ACQ FOR 140 K 0 SEARCH-SIZE-Y=1 Comments: Peak up in slit. Acquisition fits in 1 orbit. ------------------------------------------------------------------------------------------------------------------------------------ 140 NGC4486 FOS/BL ACCUM 0.25X2. G130H 1 200 M 0 Comments: Science exposure for 2nd visit. ------------------------------------------------------------------------------------------------------------------------------------ 5921( 8) - 02/03/97 14:45 - [ 4] Visit: 51 Visit Requirements: On Hold Comments: Additional Comments: SAVE OFFSET for later use in Visit 52 which is to be done at least 4 days later. ( The extra day is to allow for possible problems with the Archive so that FOS scientists will still have time to accurately measure the offset, and this period is used at their request. ) Also, please note the following preferences and accomodate if you can do so. Avoid FGS1, and instead use FGS2 and FGS3 with FGS3 being dominant, if possible. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M87 FOS/BL ACQ/PEA 4.3 MIRROR SEARCH-SIZE-X=1,SEARCH-SIZE-Y=3, 1 20 S ONBOARD ACQ FOR 2 K SCAN-STEP-Y=1.23 ------------------------------------------------------------------------------------------------------------------------------------ 2 M87 FOS/BL ACQ/PEA 1.0 MIRROR SEARCH-SIZE-X=6,SEARCH-SIZE-Y=2, 1 20 S ONBOARD ACQ FOR 3 K SCAN-STEP-X=0.602, SCAN-STEP-Y=0.602 ------------------------------------------------------------------------------------------------------------------------------------ 3 M87 FOS/BL ACQ/PEA 0.5 MIRROR SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3, 1 20 S ONBOARD ACQ FOR 4 K SCAN-STEP-X=0.30,SCAN-STEP-Y=0.30 ------------------------------------------------------------------------------------------------------------------------------------ 4 M87 FOS/BL ACQ/PEA 0.3 MIRROR SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3, 1 20 S ONBOARD ACQ FOR 5 K SCAN-STEP-X=0.17,SCAN-STEP-Y=0.17 ------------------------------------------------------------------------------------------------------------------------------------ 5 M87 FOS/BL ACQ/PEA 0.3 MIRROR SEARCH-SIZE-X=5,SEARCH-SIZE-Y=5, 1 20 S ONBOARD ACQ FOR 6 SAVE K SCAN-STEP-X=0.052, OFFSET VIS51 SCAN-STEP-Y=0.052 ------------------------------------------------------------------------------------------------------------------------------------ 6 M87 FOS/BL ACCUM 0.3 G130H 1 10000 S Comments: Science exposure for 1st visit. ------------------------------------------------------------------------------------------------------------------------------------ 5921( 8) - 02/03/97 14:45 - [ 5] Visit: 52 Visit Requirements: AFTER 51 BY 4D SAME ORIENT AS 51 On Hold Comments: Additional Comments: Allow 1 extra day for the Re-use offset measurements in case of any Archive problems, etc. as per FOS scientist's request. ( The software automatically inserts a 3-day minimum time period link, but the FOS scientists desire a 4- day minimum period here if possible. ) Also, the SAME ORIENT and the SAME GUIDE STARS should be used for Visit 52 as for Visit 51 with the same preferences applying, e.g. if possible, avoid use of FGS1, and use FGS2 and FGS3 with FGS3 being dominant. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M87 FOS/BL ACQ/PEA 0.3 MIRROR SEARCH-SIZE-X=5,SEARCH-SIZE-Y=5, 1 20 S ONBOARD ACQ FOR 2 USE K SCAN-STEP-X=0.052, OFFSET VIS51 SCAN-STEP-Y=0.052 ------------------------------------------------------------------------------------------------------------------------------------ 2 M87 FOS/BL ACCUM 0.3 G130H 1 12400 S USE OFFSET VIS51 Comments: Science exposure for 2nd visit. ------------------------------------------------------------------------------------------------------------------------------------ 5921( 8) - 02/03/97 14:45 - [ 6] Summary Form for Proposal 5921 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/BINARY ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FAINT=1320. BRIGHT=660000. SEARCH-SIZE-Y=3 SEARCH-SIZE-Y=1 SEARCH-SIZE-X=3 SEARCH-SIZE-X=9 SCAN-STEP-Y=1.23 SCAN-STEP-Y=0.602 SCAN-STEP-Y=0.30 SCAN-STEP-Y=0.17 SCAN-STEP-Y=0.052 SCAN-STEP-X=0.052 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Galaxies & Clusters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 020 ONBOARD ACQ FOR 030 ONBOARD ACQ FOR 040 ONBOARD ACQ FOR 120 ONBOARD ACQ FOR 130 ONBOARD ACQ FOR 140 ONBOARD ACQ FOR 2 ONBOARD ACQ FOR 3 ONBOARD ACQ FOR 4 ONBOARD ACQ FOR 5 ONBOARD ACQ FOR 6 SAVE OFFSET VIS51 AFTER 51 BY 4D SAME ORIENT AS 51 ONBOARD ACQ FOR 2 USE OFFSET VIS51 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G130H ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC4486 M87 ------------------------------------------------------------------------------------------------------------------------------------