7320( 7) - 05/21/98 14:50 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 7320 Version: 7 Check-in Date: 21-May-1998 14:45:22 1.Proposal Title: Distribution of Forbidden Iron [FeII] Emission at the Galactic Center ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 7 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: FULVIO MELIA UNIVERSITY OF ARIZONA, STEWARD OBSERVATORY CoI: Farhad Yusef-Zadeh Northwestern University N CoI: Joseph Haller University of Arizona N CoI: George Rieke University of Arizona N CoI: Susan Stolovy University of Arizona Y ------------------------------------------------------------------------------------ 5. Abstract A conspicuous feature known as the mini-cavity appears as a hole in the distribution of ionized gas within a few arcseconds of the dynamical center of the Galaxy. The mini-cavity is distinguished from the rest of the ionized gas in this region by its high [FeIII] abundance and unusual kinematics. We propose narrow band observations using NICMOS Cameras 1 and 3 to image forbidden iron [FeII] emission from this remarkable region. We intend to test the model in which the mini-cavity results from a fast wind originating within the IRS 16 complex, and which is subsequently focused gravitationally by the hypothesized massive black hole coincident with neutral gas (the "mini-spiral") orbiting the Galactic center. The orbiting gas is shocked, compressed and the dust grains within it are destroyed to enhance the gas phase abundance in the mini-cavity. We believe the proposed observation bears strongly on the formation of the mini-cavity and provides a powerful clue as to the source and nature of the activity in the Galactic center. The [FeII] observations will improve on ground-based observations in spatial resolution, sensitivity, and spatial coverage. They will extend from the mini-cavity region and to the Northern Arm region using Camera 3. Camera 1 observations will look for small scale spatial structure in the shock of the mini-cavity and comparisons with radio maps will be made possible via an image of the Pa Alpha line in the region coincident with the mini-cavity. ------------------------------------------------------------------------------------ 7320( 7) - 05/21/98 14:50 - [ 2] Observations Description ------------------------ **5/21/98 At the request of the PC, I am including visit 1 and the old target definitions even though visit 1 has already executed**** ###################(Revised comments as of 3/24/98)############## The 5 orbits of this proposal are now split into 1) visit 1: 3 orbits using camera 1 only, to be executed as early as possible given the orient constraint. We request that this visit be executed in early July 1997. (already completed) 2) visit 2: 1 orbit using camera 3 ([FeII]) and 1 orbit of camera 1 ([FeII])to cover areas near the SW part of the minicavity that was not covered by the first visit. This was partly because there was apparently a larger error than expected in the absolute HST pointing. ************************************************************* Real Time Justification ----------------------- We do not request that this program be executed during a Camera 3 campaign. Calibration Justification ------------------------- Additional Comments ------------------- Using NIC1 and NIC3 apertures to put on good parts of the array, without use of POS-TARGS. ------------------------------------------------------------------------------------ Data Distribution Media: DAT Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 7320( 7) - 05/21/98 14:50 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GALCENT ISM, HII REGION RA=17H 45M 40S +/- 0.5", DEC=- J2000 F-LINE(1.64)=1e-17 29D 0' 28" +/- 0.5" Comments: Expected flux units are W m-2 micron-1 per arcsec-2 2 GALCENT-1 ISM, HII REGION RA-OFF=-0.7622S+/- 0.001S, DEC- J2000 F-LINE(1.64)=1e-17 OFF=-10"+/- 0.01", FROM 1 Comments: SW position. Covers [FeII] peak and Western arc (SW part). Position is 10''W, 10''S of Sgr A*. 3 GALCENT-2 ISM, HII REGION RA-OFF=-0.38112S+/- .001S, DEC- J2000 F-LINE(1.64)=1e-17 OFF=25.0"+/- .001", FROM 1 Comments: Covers Northern Arm and OH Maser position. Position is 5.0''W , 25''N of Sgr A*. 4 GALCENT-3 ISM, HII REGION RA-OFF=-0.7622S+/- 0.01S, DEC- J2000 F-LINE(1.64)=1e-17 OFF=75.0"+/- 0.001", FROM 1 Comments: This covers the extension of the Northern Arm through the Circumnuclear Disk and the [SiII] peak. Position is 10''W, 75''N of Sgr A*. 5 GALCENT-TRUE ISM, HII REGION RA=17H 45M 40.045S +/- 0.5", J2000 F-LINE(1.64)=1e-17 DEC=-29D 0' 27.9" +/- 0.5" Comments: This is the Rogers et al. 1994 radio position of Sgr A*, slightly corrected as compared to the position in the first visit of 7320. 6 GALCENT-C3A ISM, HII REGION RA-OFF=-0.53357S+/- .001S, DEC- J2000 F-LINE(1.64)=1e-17 OFF=-14.0"+/- .01", FROM 5 Comments: SW position. Covers [FeII] peak and Western arc (SW part). Position is 7''W, 14''S of Sgr A*. Longest integration time at this position. 7 GALCENT-C3B ISM, HII REGION RA-OFF=1.37202S+/- .001S, DEC- J2000 F-LINE(1.64)=1e-17 OFF=30.0"+/- .001", FROM 5 Comments: Covers Northern Arm, OH Maser position toward NW, and Pa alpha feature. Position is 18''E and 30'' N of Sgr A*. 8 GALCENT-C3C ISM, HII REGION RA-OFF=-0.53357S+/- 0.01S, DEC- J2000 F-LINE(1.64)=1e-17 OFF=63.0"+/- 0.001", FROM 5 Comments: This covers the extension of the Northern Arm through the Circumnuclear Disk and the [SiII] peak. Position is 7''W, 63''N of Sgr A*. 9 GALCENT-C1A ISM, HII REGION RA-OFF=0.13720S+/- 0.01S, DEC- J2000 F-LINE(1.64)=1e-17 OFF=-4.0"+/- 0.001", FROM 5 Comments: This covers the southern end of the mini-cavity. Position is 1.8''E, 4.0''S of Sgr A*. Use the NIC1 aperture to put on a good part of the array. Y strip dither with a pattern orient of 45 will go NE. 7320( 7) - 05/21/98 14:50 - [ 4] Visit: 01 Visit Priority: Visit Requirements: SCHED 30% ORIENT 89D TO 91D 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 GALCENT NIC1 MULTIAC NIC1-FI F166N SAMP-SEQ=STEP64,NSAMP=13, 1 DEF POS TARG 3.5355,-2.1213 CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, PAR 20 WITH 10 DITH-SIZE=0.2795,OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 20 GALCENT NIC2 MULTIAC NIC2 F212N SAMP-SEQ=STEP64,NSAMP=13 1 DEF CUM Comments: parallel H2 ------------------------------------------------------------------------------------------------------------------------------------ 30 GALCENT NIC1 MULTIAC NIC1-FI F164N SAMP-SEQ=STEP64,NSAMP=13, 1 DEF POS TARG 3.5355,-2.1213 CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, PAR 40 WITH 30 DITH-SIZE=0.2795,OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 40 GALCENT NIC2 MULTIAC NIC2 F215N SAMP-SEQ=STEP64,NSAMP=13 1 DEF CUM Comments: parallel H2 cont ------------------------------------------------------------------------------------------------------------------------------------ 50 GALCENT NIC1 MULTIAC NIC1-FI F187N SAMP-SEQ=STEP64,NSAMP=10, 1 DEF PAR 60-70 WITH 50 POS CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, TARG 3.5355,-2.1213 DITH-SIZE=0.2795,OFFSET=SAM Comments: Pa Alpha, use 166N for continuum ------------------------------------------------------------------------------------------------------------------------------------ 60 GALCENT NIC2 MULTIAC NIC2 F187N SAMP-SEQ=STEP64,NSAMP=9 1 DEF CUM Comments: parallel Pa alpha in SW lobe ------------------------------------------------------------------------------------------------------------------------------------ 70 GALCENT NIC2 MULTIAC NIC2 F190N SAMP-SEQ=STEP64,NSAMP=9 1 DEF CUM Comments: parallel Pa alpha cont ------------------------------------------------------------------------------------------------------------------------------------ 80 GALCENT NIC1 MULTIAC NIC1-FI F164N SAMP-SEQ=STEP64,NSAMP=13, 1 DEF POS TARG 3.1820,-4.5962 CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, PAR 90 WITH 80 DITH-SIZE=0.2795,OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 90 GALCENT NIC2 MULTIAC NIC2 F215N SAMP-SEQ=STEP64,NSAMP=13 1 DEF CUM Comments: parallel H2 cont ------------------------------------------------------------------------------------------------------------------------------------ 100 GALCENT NIC1 MULTIAC NIC1-FI F166N SAMP-SEQ=STEP64,NSAMP=14, 1 DEF POS TARG 3.1820,-4.5962 CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, PAR 110 WITH 100 DITH-SIZE=0.2795,OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 110 GALCENT NIC2 MULTIAC NIC2 F212N SAMP-SEQ=STEP64,NSAMP=14 1 DEF CUM Comments: parallel H2 ------------------------------------------------------------------------------------------------------------------------------------ 7320( 7) - 05/21/98 14:50 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 120 GALCENT NIC1 MULTIAC NIC1-FI F187N SAMP-SEQ=STEP64,NSAMP=11, 1 DEF PAR 130-140 WITH 120 POS CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, TARG 3.1820,-4.5962 DITH-SIZE=0.2795,OFFSET=SAM Comments: Pa Alpha, use 166N for continuum ------------------------------------------------------------------------------------------------------------------------------------ 130 GALCENT NIC2 MULTIAC NIC2 F187N SAMP-SEQ=STEP64,NSAMP=9 1 DEF CUM Comments: parallel Pa alpha in SW lobe ------------------------------------------------------------------------------------------------------------------------------------ 140 GALCENT NIC2 MULTIAC NIC2 F190N SAMP-SEQ=STEP64,NSAMP=9 1 DEF CUM Comments: parallel Pa alpha cont ------------------------------------------------------------------------------------------------------------------------------------ 150 GALCENT NIC1 MULTIAC NIC1-FI F166N SAMP-SEQ=STEP64,NSAMP=14, 1 DEF POS TARG 1.0607,-4.5962 CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, PAR 160 WITH 150 DITH-SIZE=0.2795,OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 160 GALCENT NIC2 MULTIAC NIC2 F212N SAMP-SEQ=STEP64,NSAMP=14 1 DEF CUM Comments: parallel H2 ------------------------------------------------------------------------------------------------------------------------------------ 170 GALCENT NIC1 MULTIAC NIC1-FI F187N SAMP-SEQ=STEP64,NSAMP=10, 1 DEF PAR 180-190 WITH 170 POS CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, TARG 1.0607,-4.5962 DITH-SIZE=0.2795,OFFSET=SAM Comments: Pa Alpha, use 166N for continuum ------------------------------------------------------------------------------------------------------------------------------------ 180 GALCENT NIC2 MULTIAC NIC2 F187N SAMP-SEQ=STEP64,NSAMP=9 1 DEF CUM Comments: parallel Pa alpha in SW lobe ------------------------------------------------------------------------------------------------------------------------------------ 190 GALCENT NIC2 MULTIAC NIC2 F190N SAMP-SEQ=STEP64,NSAMP=9 1 DEF CUM Comments: parallel Pa alpha cont ------------------------------------------------------------------------------------------------------------------------------------ 200 GALCENT NIC1 MULTIAC NIC1-FI F164N SAMP-SEQ=STEP64,NSAMP=13, 1 DEF POS TARG 1.0607,-4.5962 CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, PAR 210 WITH 200 DITH-SIZE=0.2795,OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 210 GALCENT NIC2 MULTIAC NIC2 F215N SAMP-SEQ=STEP64,NSAMP=13 1 DEF CUM Comments: parallel H2 cont ------------------------------------------------------------------------------------------------------------------------------------ 220 GALCENT NIC1 MULTIAC NIC1-FI F164N SAMP-SEQ=STEP64,NSAMP=13, 1 DEF POS TARG 1.0607, 1.0607 CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, PAR 230 WITH 220 DITH-SIZE=0.2795,OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 230 GALCENT NIC2 MULTIAC NIC2 F215N SAMP-SEQ=STEP64,NSAMP=13 1 DEF CUM Comments: parallel H2 cont ------------------------------------------------------------------------------------------------------------------------------------ 7320( 7) - 05/21/98 14:50 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 240 GALCENT NIC1 MULTIAC NIC1-FI F166N SAMP-SEQ=STEP64,NSAMP=13, 1 DEF POS TARG 1.0607, 1.0607 CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, PAR 250 WITH 240 DITH-SIZE=0.2795,OFFSET=SAM ------------------------------------------------------------------------------------------------------------------------------------ 250 GALCENT NIC2 MULTIAC NIC2 F212N SAMP-SEQ=STEP64,NSAMP=13 1 DEF CUM Comments: parallel H2 ------------------------------------------------------------------------------------------------------------------------------------ 260 GALCENT NIC1 MULTIAC NIC1-FI F187N SAMP-SEQ=STEP64,NSAMP=10, 1 DEF PAR 270-280 WITH 260 POS CUM X PATTERN=SPIRAL-DITH,NUM-POS=2, TARG 1.0607, 1.0607 DITH-SIZE=0.2795,OFFSET=SAM Comments: Pa Alpha, use 166N for continuum ------------------------------------------------------------------------------------------------------------------------------------ 270 GALCENT NIC2 MULTIAC NIC2 F187N SAMP-SEQ=STEP64,NSAMP=9 1 DEF CUM Comments: parallel Pa alpha in SW lobe ------------------------------------------------------------------------------------------------------------------------------------ 280 GALCENT NIC2 MULTIAC NIC2 F190N SAMP-SEQ=STEP64,NSAMP=9 1 DEF CUM Comments: parallel Pa alpha cont ------------------------------------------------------------------------------------------------------------------------------------ 7320( 7) - 05/21/98 14:50 - [ 7] Visit: 02 Visit Priority: Visit Requirements: SCHED 30% ORIENT 91D TO 91D BETWEEN 01-Jun-1998 AND 31-Jul-1998 On Hold Comments: Additional Comments: The pointed positions have been adjusted (including increasing the dither size) to best cover all expected [FeII] flux. At an orient of 90, the dithers go SE, SW, NW. Note: We are using the defined apertures NIC1 instead of NIC1-FIX to get to an optimized part of the array. We are using NIC3-FIX, however. Visit one had an orient restriction ranging from 89-91, but the actual data has an orient near 91, so we are restricting it to the same value for consistency in the mosaic. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 GALCENT-C3A NIC3 MULTIAC NIC3-FI F164N SAMP-SEQ=STEP32,NSAMP=11, 1 DEF CUM X PATTERN=SPIRAL-DITH,NUM-POS=4, OFFSET=SAM,DITH-SIZE=5.5 ------------------------------------------------------------------------------------------------------------------------------------ 20 GALCENT-C3A NIC3 MULTIAC NIC3-FI F166N SAMP-SEQ=STEP32,NSAMP=11, 1 DEF CUM X PATTERN=SPIRAL-DITH,NUM-POS=4, OFFSET=SAM,DITH-SIZE=5.5 ------------------------------------------------------------------------------------------------------------------------------------ 30 GALCENT-C3B NIC3 MULTIAC NIC3-FI F164N SAMP-SEQ=STEP32,NSAMP=9, 1 DEF CUM X PATTERN=SPIRAL-DITH,NUM-POS=3, OFFSET=SAM,DITH-SIZE=5.5 ------------------------------------------------------------------------------------------------------------------------------------ 40 GALCENT-C3B NIC3 MULTIAC NIC3-FI F166N SAMP-SEQ=STEP32,NSAMP=9, 1 DEF CUM X PATTERN=SPIRAL-DITH,NUM-POS=3, OFFSET=SAM,DITH-SIZE=5.5 ------------------------------------------------------------------------------------------------------------------------------------ 50 GALCENT-C3C NIC3 MULTIAC NIC3-FI F164N SAMP-SEQ=STEP32,NSAMP=9, 1 DEF CUM X PATTERN=SPIRAL-DITH,NUM-POS=3, OFFSET=SAM,DITH-SIZE=5.5 ------------------------------------------------------------------------------------------------------------------------------------ 60 GALCENT-C3C NIC3 MULTIAC NIC3-FI F166N SAMP-SEQ=STEP32,NSAMP=9, 1 DEF CUM X PATTERN=SPIRAL-DITH,NUM-POS=3, OFFSET=SAM,DITH-SIZE=5.5 ------------------------------------------------------------------------------------------------------------------------------------ 70 GALCENT-C1A NIC1 MULTIAC NIC1 F164N SAMP-SEQ=STEP32,NSAMP=13, 1 DEF PAR 75 WITH 70 CUM PATTERN=YSTRIP-DITH,NUM-POS=6, OFFSET=SAM,DITH-SIZE=1.222, PATTERN-ORIENT=45 ------------------------------------------------------------------------------------------------------------------------------------ 75 GALCENT-C1A NIC2 MULTIAC NIC2-FI F187N SAMP-SEQ=STEP32,NSAMP=13 1 DEF CUM X ------------------------------------------------------------------------------------------------------------------------------------ 80 GALCENT-C1A NIC1 MULTIAC NIC1 F166N SAMP-SEQ=STEP32,NSAMP=13, 1 DEF PAR 85 WITH 80 CUM PATTERN=YSTRIP-DITH,NUM-POS=6, OFFSET=SAM,DITH-SIZE=1.222, PATTERN-ORIENT=45 ------------------------------------------------------------------------------------------------------------------------------------ 85 GALCENT-C1A NIC2 MULTIAC NIC2-FI F190N SAMP-SEQ=STEP32,NSAMP=13 1 DEF CUM X ------------------------------------------------------------------------------------------------------------------------------------ 7320( 7) - 05/21/98 14:50 - [ 8] Summary Form for Proposal 7320 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures NIC1-FIX NIC2 NIC3-FIX NIC1 NIC2-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations NIC1 NIC2 NIC3 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SAMP-SEQ=STEP64 NSAMP=13 PATTERN=SPIRAL-DITH NUM-POS=2 DITH-SIZE=0.2795 OFFSET=SAM NSAMP=10 NSAMP=9 NSAMP=14 NSAMP=11 DITH-SIZE=5.5 NUM-POS=4 NUM-POS=3 SAMP-SEQ=STEP32 PATTERN-ORIENT=45 DITH-SIZE=1.222 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SCHED 30% ORIENT 89D TO 91D POS TARG 3.5355,-2.1213 PAR 20 WITH 10 POS TARG 3.5355,-2.1213 PAR 40 WITH 30 PAR 60-70 WITH 50 POS TARG 3.5355,-2.1213 POS TARG 3.1820,-4.5962 PAR 90 WITH 80 POS TARG 3.1820,-4.5962 PAR 110 WITH 100 PAR 130-140 WITH 120 POS TARG 3.1820,-4.5962 POS TARG 1.0607,-4.5962 PAR 160 WITH 150 PAR 180-190 WITH 170 POS TARG 1.0607,-4.5962 POS TARG 1.0607,-4.5962 PAR 210 WITH 200 POS TARG 1.0607, 1.0607 PAR 230 WITH 220 POS TARG 1.0607, 1.0607 PAR 250 WITH 240 PAR 270-280 WITH 260 POS TARG 1.0607, 1.0607 SCHED 30% ORIENT 91D TO 91D BETWEEN 01-Jun-1998 AND 31-Jul-1998 PAR 75 WITH 70 PAR 85 WITH 80 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F166N F212N F164N F215N F187N F190N ------------------------------------------------------------------------------------------------------------------------------------ Target Names GALCENT GALCENT-C3A GALCENT-C3B GALCENT-C3C GALCENT-C1A ------------------------------------------------------------------------------------------------------------------------------------