Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 3550c Report Date: 09-May-96:18:42 Version: ********** Check-in Date: ********** 1.Proposal Title: DETECTION OF ABSORPTION LINES FROM GAS IN THE COOLING FLOW IN THE PERSEUS CLUSTER ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID GALAXIES & CLUSTERS GO 3550 Sub Category GAS & DUST ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Roderick M Johnstone INSTITUTE OF ASTRONOMY, UNIV UK +223-337548 ------------------------------------------------------------------------------------ 7. Abstract We wish to take a deep FOS spectrum of the Seyfert nucleus in NGC1275 to search for absorption lines of CIV(1550A), SiIV(1400A) and CII(1335). These data will provide a vital link between the cooling flow gas seen at X-ray energies and the much colder gas seen through the emission of optical lines and the absorption of X-rays. Detailed study of the relative line strengths will give information on the presence of heating mechnisms in this temperature range. Detection of these lines will also provide direct evidence in support of the hypothesis that metal-line systems commonly observed in QSO spectra are formed in cooling flows present along the line of sight. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 2.78 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: FOS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 3550c PI: Roderick M Johnstone Proposal Title: DETECTION OF ABSORPTION LINES FROM GAS IN THE COOLING FLOW IN THE PERSEUS CLUSTER ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Pi Roderick M Johnstone INSTITUTE OF ASTRONOMY UK X Andrew C Fabian INSTITUTE OF ASTRONOMY UK X Alastair C Edge INSTITUTE OF ASTRONOMY UK X Carolin S Crawford INSTITUTE OF ASTRONOMY UK X ------------------------------------------------------------------------------------ 2. Scientific Justification. ------------------------------------------------------------------------------------ 3. Description of proposed observations. We propose to take a ~10,000s exposure of NGC1275 with the FOS G130H to search for absorption due to the CIV (1550A) doublet and other lines as the gas in the cooling flow drops down through temperatures ~1E5K. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. This proposal requires satellite time because the strong resonance lines are in the ultraviolet part of the spectrum. This observation requires several hours of HST time and would not be feasible with IUE. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. Data reduction will be carried out using facilities at our local node of the STARLINK network. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. ------------------------------------------------------------------------------------ 9. Description of previous HST work. ID1608. Constraints on the continuum model of active nuclei: Fast UV variation. (Ward et al.) involves AC Fabian. Data not yet taken. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). We will use the computing facilities available at our local node of the STARLINK network. ------------------------------------------------------------------------------------ 11. Address Information Name: RODERICK M JOHNSTONE Category: PI Institution: INSTITUTE OF ASTRONOMY Address: MADINGLEY ROAD City: CAMBRIDGE CB3 0HA State: Zip Code: Country: UK Telephone: +223-337548 Telex (or e-mail): 817297 ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 3550c [ 3] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 GSC2856.0116 J, 701 RA = 03H 19M 51.1514S +/- 2000 Z = 0.0 1 V = 12.93 +/- 0.60 2-OFFSET 0.14", DEC = +41D 31' 25.968" +/- 0.14" Comments: POSITIONS AND MAG FROM GSC ; SP=LATER THAN G FROM ROUGH POSS MEASUREMENT ; PM AND COLOUR TO BE REFINED IF POSSIBLE ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC1275 E, 312, 309, 303 XI-OFF = -33.600" +/- V = 5260 1 V = 12.6 +/- 0.1 PERSEUS CD 0.005", 1 B-V = 0.6 ETA-OFF = -42.243" +/- 2 F-CONT(1550) = 5 E-15 0.005", 3 F-CONT(1300) = 5 E-15 FROM 1 Comments: OFFSETS TO BE REFINED PENDING IMPROVED TRANSFORMATION COEFFICIENTS FOR PC IMAGES ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3550c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GSC2856.011 FOS/BL ACQ/ 4.3 MIRROR 1 8.5S 1 1 ONBOARD ACQ FOR 2 62-OFFSET BINARY CYCLE 2 / 1-3 ------------------------------------------------------------------------------------------------------------------------------------ 2 GSC2856.011 FOS/BL ACQ/ 0.25X2. MIRROR TYPE=UP 1 8.5S 1 2 ONBOARD ACQ FOR 62-OFFSET PEAK 0 3.0 SPATIAL SCAN ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC1275 FOS/BL ACCUM 0.25X2. G130H 1 9100S 18 2 1 0 3 ------------------------------------------------------------------------------------------------------------------------------------ Scan Paramters Form Proposal ID: 3550c [ 5] ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 1 Exposure Logsheet lines: 2 FGS Scan: N DWELL Dwell Only: dwell points/line: 7 Seconds per dwell: 0.00 Scan width (arc-secs): 0.0000 Scan length (arc-secs): 0.4000 Angle between sides (degrees) 0.00 Number of lines: 1 Scan rate (arc-sec/sec): 0.0000 PA of first scan line (degrees) 90.000 Scan frame (CEL or S/C): S/C Length Offset (arc-sec): 0.2000 Width Offset (arc-sec): ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 3550c [ 6] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/BINARY ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters TYPE ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 2.78 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category GALAXIES & CLUSTERS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category GAS & DUST ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2; CYCLE 2 / 1-3 ONBOARD ACQ FOR 3.0 ; SPATIAL SCAN ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G130H ------------------------------------------------------------------------------------------------------------------------------------ Target Names GSC2856.01162-OFFSET NGC1275 PERSEUS CD ------------------------------------------------------------------------------------------------------------------------------------