5889( 10) - 08/11/95 12:16 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5889 Version: 10 Check-in Date: ********** 1.Proposal Title: PROBING THE OUTER GALAXY HALO ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Interstellar Medium GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Blair Savage University of Wisconsin-Madison CoI: Limin Lu University of Wisconsin-Madison Y CoI: Kenneth Sembach Massachusetts Institute of Technology N ------------------------------------------------------------------------------------ 6. Abstract We propose to obtain GHRS 15 km/s resolution G160M integrations of highly ionized gas absorption (N V and CIV) toward PKS2155-304 and NGC5548 in order to continue our HST program to study highly ionized gas in the unexplored outer Galactic halo. The spectral integrations are planned to also provide important low ionization measurements of absorption by Mg II, S II, and Si II. The data will be used to study such questions as: What are the physical properties of gas in the outer Galaxy halo? Does the Galaxy have a highly ionized outer boundary? What are the ionization processes occurring in the outer Galaxy halo? Does the Galaxy have a high velocity cloud phenomenon detectable in high ionization lines? What are the relationships between the high ionization and low ionization absorption? What is the relationship between absorption occurring in the outer Galaxy halo and that seen in quasar absorption line systems at low and high redshift? ------------------------------------------------------------------------------------ 5889( 10) - 08/11/95 12:16 - [ 2] Observations Description ------------------------ We will use the GHRS and the Large Science Aperture to obtain G160M observations of two AGN targets in the ACCUM mode. The first target is PKS 2155 -304 for which a G160M integration centered at 1538 A (covering the wavelength region 1521-1554 A) will be taken with two orbits. The second target is NGC 5548 for which we will take two G160M integrations. The first integration will be centered at 1250 A (covering the wavelength region 1233-1268 A) with 2 orbits, and the second integration will be centered at 1538 A (ie, identical setup as for PKS 2155-304) with 4 orbits. All measurements will be obtained with the step pattern 4, which provides two samplings per diode width. The standard FP-split and comb-addition scanning sequence will be used to reduced photocathode and detector window fixed pattern noise. Real Time Justification ----------------------- Not applicable Calibration Justification ------------------------- We request Pt wavelength calibration lamp exposures be taken at the beginning of each object integration in order to obtain precise wavelength calibrations. Accurate wavelength calibrations are crucial to our scientific analyses because we will compare the detailed profiles of different absorption lines. Additional Comments ------------------- no additional comments. ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: the GHRS team*at Goddard*Space Flight*Center Ship Via: UPS Email: hrsdata@hrs.gsfc.nasa.gov , ------------------------------------------------------------------------------------ 5889( 10) - 08/11/95 12:16 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PKS2155-304 Galaxy,Seyfert,BL Lac, RA = 21H 58M 51.99S +/- 0.03S, J2000 z=0.117 V=13.6 f(1538)=8+/-1 E-14 DEC = -30D 13' 32.3" +/- 0.4", PLATE-ID = 02J3 Comments: Coordinates are from GSC Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1979.484 0.0 0.0 0.0 2 NGC5548 Galaxy, Seyfert RA = 14H 17M 59.57S +/- 0.02S, J2000 Z=0.017 V=13.7 f(1250)=2.4+/-0.2 E-13 DEC = 25D 08' 12.4" +/- 0.3", f(1538)=6+/-1 E-14 PLATE-ID = 01TM Comments: Coordinates are from GSC Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1982.384 0.0 0.0 0.0 5889( 10) - 08/11/95 12:16 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 101 PKS2155-304 HRS ACQ 2.0 MIRROR-N2 SEARCH-SIZE=3 1 3.6S ONBOARD ACQ FOR 102 BRIGHT=RETURN Comments: STEP-TIME=0.4S Expect 6000 count/sec ------------------------------------------------------------------------------------------------------------------------------------ 102 PKS2155-304 HRS ACQ/PEA 2.0 MIRROR-N2 1 40.8S ONBOARD ACQ FOR 103-105 KUP Comments: STEP-TIME=0.4S ------------------------------------------------------------------------------------------------------------------------------------ 103 WAVE HRS ACCUM SC2 G160M 1538 1 54.4S Comments: WAVECAL for exposures 104-105 Do NOT move carrousel ------------------------------------------------------------------------------------------------------------------------------------ 104 PKS2155-304 HRS ACCUM 2.0 G160M 1538 FP-SPLIT=STD 6 921.6S STEP-PATT=4 SPYBAL=NO ------------------------------------------------------------------------------------------------------------------------------------ 105 PKS2155-304 HRS ACCUM 2.0 G160M 1538 FP-SPLIT=STD 1 1152S STEP-PATT=4 SPYBAL=NO ------------------------------------------------------------------------------------------------------------------------------------ 5889( 10) - 08/11/95 12:16 - [ 5] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 201 NGC5548 HRS ACQ 2.0 MIRROR-N2 SEARCH-SIZE=3 1 10.8S ONBOARD ACQ FOR 202 BRIGHT=RETURN Comments: STEP-TIME=1.2S Expect 2000 count/sec ------------------------------------------------------------------------------------------------------------------------------------ 202 NGC5548 HRS ACQ/PEA 2.0 MIRROR-N2 1 122.4S ONBOARD ACQ FOR 203-207 KUP Comments: STEP-TIME=1.2S ------------------------------------------------------------------------------------------------------------------------------------ 203 WAVE HRS ACCUM SC2 G160M 1250 1 54.4S Comments: WAVECAL for exposures 204 Do NOT move carrousel ------------------------------------------------------------------------------------------------------------------------------------ 204 NGC5548 HRS ACCUM 2.0 G160M 1250 FP-SPLIT=STD 5 921.6S STEP-PATT=4 SPYBAL=NO ------------------------------------------------------------------------------------------------------------------------------------ 205 WAVE HRS ACCUM SC2 G160M 1538 1 54.4S Comments: WAVECAL for exposure 206-207 Do NOT move carrousel ------------------------------------------------------------------------------------------------------------------------------------ 206 NGC5548 HRS ACCUM 2.0 G160M 1538 FP-SPLIT=STD 7 921.6S STEP-PATT=4 SPYBAL=NO ------------------------------------------------------------------------------------------------------------------------------------ 207 NGC5548 HRS ACCUM 2.0 G160M 1538 FP-SPLIT=STD 3 1152S STEP-PATT=4 SPYBAL=NO ------------------------------------------------------------------------------------------------------------------------------------ 5889( 10) - 08/11/95 12:16 - [ 6] Summary Form for Proposal 5889 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAKUP ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SEARCH-SIZE=3 BRIGHT=RETURN FP-SPLIT=STD STEP-PATT=4 SPYBAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Interstellar Medium ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 102 ONBOARD ACQ FOR 103-105 ONBOARD ACQ FOR 202 ONBOARD ACQ FOR 203-207 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N2 G160M ------------------------------------------------------------------------------------------------------------------------------------ Target Names PKS2155-304 WAVE NGC5548 ------------------------------------------------------------------------------------------------------------------------------------