Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5300 Report Date: 18-Jul-95:17:07 Version: ********** Check-in Date: ********** 1.Proposal Title: PROBING THE OUTER GALACTIC HALO: CYCLE 4 HIGH ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID INTERSTELLAR MEDIUM GO Sub Category ABSORPTION LINES ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Blair D. Savage UNIVERSITY OF WISCSONSIN-MAD USA ------------------------------------------------------------------------------------ 7. Abstract We propose to obtain GHRS 15 km/s resolution G160M integrations of highly ionized gas absorption toward two AGNs in order to continue our HST program to study highly ionized gas in the unexplored outer Galactic halo. F 9 will be observed in the lines of C IV and N V and Mark 509 in the lines of C IV (with the N V measurements coming from Cycle 2 program GO3463). The spectral integrations are planned to also provide important low ionization measurements of absoprtion by Mg II, S II, and Si II. The data will be used to study such questions as: What is the physical properties of gas in the outer Galactic halo? Does the Galaxy have a highly ionized outer boundary? what are the ionization processes occurring in the outer Galactic halo? Does the Galaxy have a high velocity cloud phenomenon detectable in high ionizatioin lines? What are the relationships between the high ionization and low ionization absorption? What is the relationship between absorption occurring in the outer Galactic halo and that seen in quasar absorption line systems at low and high redshifts? ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 10.00 par: 0 10. Num targs pri: 2 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: HRS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5300 PI: Blair D. Savage Proposal Title: PROBING THE OUTER GALACTIC HALO: CYCLE 4 HIGH ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Pi Blair D. Savage UNIVERSITY OF WISCSONSIN-MADISON USA Limin Lu UNIVERSITY OF WISCSONSIN-MADISON USA Kenneth R. Sembach MASSACHUSETTS INSTITUTE OF USA TECHNOLOGY ------------------------------------------------------------------------------------ 3. Description of proposed observations. We will make GHRS observations of the AGNs Mark509 and F9. The G160M grating and the Large Science Aperture will be used. Mark509 will be observed with one setup centered at 1540 angstroms. F9 will be observed with two setups centered at 1250 and 1540 angstroms, respectively. All measurements will be made with two samples per diode substepping, and with standard FP-SPLIT. S/N and exposure time estimates are based on IUE spectra. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. The proposed study requires UV capabilities. The IUE is incapable of carrying out the proposed study because of its limited spectral resolution and S/N characteristics. The FOS observations (already exist) are of too low resolution for the proposed scientific analysis. The GHRS on board the HST is the only instrument that can achieve the required high resolution, high S/N observations. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. No request for special scheduling or real-time observations. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. We request a Pt lamp exposure be obtained immediately prior to each of the science observations. This is necessary because the proposed scientific analysis requires comparison of absorption velocities between different ion species. Thus accurate wavelength calibration is crucial. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. No additional comments or requests ------------------------------------------------------------------------------------ 9. Description of previous HST work. The proposers are involved in the following HST programs: GTO1162-Interstellar Abundances Toward Extreme Depletion Sight Lines (Savage and Cardelli) GTO1165,3960,4094-Spectroscopy of Milky Way Halo Gas (Savage, Sembach, and Cardelli) GO2257-Physical Conditions in the Gaseous Galactic Halo (Savage, Sembach, and Cardelli) GO2424-Quasar Absorption Line Survey (Bahcall et al, including Savage) GO3463-Highly Ionized Nitrogen in the Galactic Halo (Savage, Sembach, and Lu) Most of the data have been received and analized. There have been 16 publications so far based on these data. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). The University of Wisconsin will provide data handling and analysis facilities available through the Midwest Astronomical Data Reduction and Analysis Facility. ------------------------------------------------------------------------------------ 11. Address Information Page 3 Name: BLAIR D. SAVAGE Category: PI Institution: UNIVERSITY OF WISCONSIN-MADISON Address: DEPARTMENT OF ASTRONOMY 475 N. CHARTER STREET City: MADISON State: WI Zip Code: 53706 Country: USA Telephone: 608-262-2395 Telex (or e-mail): 26542 UOFWISC MDS ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5300 [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 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 MARK509 E,312 PLATE-ID=00E1, J2000 Z=0.0355 1 V=13.0 IRAF2041-109 RA=20H 44M 9.759S+/-1", 2 F-CONT(1550)=8.0E-14 DEC=-10D 43' 24.50"+/-1" ------------------------------------------------------------------------------------------------------------------------------------ 2 F9 ESO113- E,312 RA=01H 23M 45.924S +/- 1", 2000 Z=0.046 1 V=13.0 IG45 DEC=-58D 48' 20.92" +/- 1" 2 F-CONT(1250)=1.2E-13 3 F-CONT(1550)=8.0E-14 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5300 [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 100 MARK509 HRS ACQ 2.0 MIRROR-N2 SEARCH-SIZE=5 1 100S 1 1 ONBOARD ACQ FOR BRIGHT=RETURN 101 CYCLE 4 / 100-104 Comments: STEP-TIME=4S EXPECTED COUNT RATE WITH N2: 3200 C/S ------------------------------------------------------------------------------------------------------------------------------------ 101 MARK509 HRS ACQ/ 2.0 MIRROR-N2 1 204S 1 1 ONBOARD ACQ FOR PEAKUP 102-104 Comments: STEP-TIME=2S ------------------------------------------------------------------------------------------------------------------------------------ 102 MARK509 HRS IMAGE 2.0 MIRROR-N2 NX=16 1 204.8S 1 1 NY=16 Comments: TAKE MAP AFTER CENTERING STEP- TIME=0.8S ------------------------------------------------------------------------------------------------------------------------------------ 103 MARK509 HRS ACCUM 2.0 G160M 1540 STEP-PATT=4 7 19.2M 15 2 1 FP-SPLIT=STD 134.4M ------------------------------------------------------------------------------------------------------------------------------------ 104 WAVE HRS ACCUM SC2 G160M 1540 1 1M 1 CALIB FOR 103 NO SLEW GROUP 103-104 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 200 F9 HRS ACQ 2.0 MIRROR-N2 SEARCH-SIZE=5 1 100S 1 1 ONBOARD ACQ FOR BRIGHT=RETURN 201 CYCLE 4 / 200-206 Comments: STEP-TIME=4S EXPECTED COUNT RATE WITH N2: 3200 C/S ------------------------------------------------------------------------------------------------------------------------------------ 201 F9 HRS ACQ/ 2.0 MIRROR-N2 1 204S 1 1 ONBOARD ACQ FOR PEAKUP 202-206 Comments: STEP-TIME=2S ------------------------------------------------------------------------------------------------------------------------------------ 202 F9 HRS IMAGE 2.0 MIRROR-N2 NX=16 1 204.8S 1 1 NY=16 Comments: TAKE MAP AFTER CENTERING STEP- TIME=0.8S ------------------------------------------------------------------------------------------------------------------------------------ 203 F9 HRS ACCUM 2.0 G160M 1250 STEP-PATT=4 7 19.2M 20 2 1 FP-SPLIT=STD 134.4M ------------------------------------------------------------------------------------------------------------------------------------ 204 WAVE HRS ACCUM SC2 G160M 1250 1 1M 1 CALIB FOR 203 NO SLEW GROUP 203-204 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ 205 F9 HRS ACCUM 2.0 G160M 1540 STEP-PATT=4 7 19.2M 15 3 1 FP-SPLIT=STD 134.4M ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5300 [ 6] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 206 WAVE HRS ACCUM SC2 G160M 1540 1 1M 1 CALIB FOR 205 NO SLEW GROUP 205-206 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5300 [ 7] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAKUP IMAGE ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SEARCH-SIZE=5 BRIGHT=RETURN NX=16 NY=16 STEP-PATT=4 FP-SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 10.00 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category INTERSTELLAR MEDIUM ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ABSORPTION LINES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 101; CYCLE 4 / 100-104; ONBOARD ACQ FOR 102-104; CALIB FOR 103 NO SLEW; GROUP 103-104 NO GAP ONBOARD ACQ FOR 201; CYCLE 4 / 200-206; ONBOARD ACQ FOR 202-206; CALIB FOR 203 NO SLEW; GROUP 203-204 NO GAP CALIB FOR 205 NO SLEW; GROUP 205-206 NO GAP ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N2 G160M ------------------------------------------------------------------------------------------------------------------------------------ Target Names MARK509 IRAF2041-109 F9 ESO113-IG45 ------------------------------------------------------------------------------------------------------------------------------------