6829( 28) - 11/11/99 09:35 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6829 Version: 28 Check-in Date: 11-Nov-1999 09:34:09 1.Proposal Title: The Luminous Giant HII Regions in M101 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 6 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: You-Hua Chu University of Illinois at Urbana - Champaign CoI: Hui Yang University of Illinois N CoI: Sean Points University of Illinois N CoI: Eugene Magnier University of Illinois N CoI: Dominik Bomans University of Illinois N ------------------------------------------------------------------------------------ 5. Abstract Giant HII regions span a luminosity range of 10^39-10^41 ergs s^-1. At the high end of this range are the three luminous giant HII regions in M101, NGC 5461, NGC 5462, and NGC 5471. The luminosities of these regions rival those of nuclear starburst regions. Only low-resolution data are available up to now, hence intriguing phenomena can be diagnosed but not studied in detail. Therefore, we request WFPC2 images of these three giant HII regions in M101, in order to study the structure of the ionized interstellar medium and the properties of the stellar content with the highest resolution. The results will help us understand starburst process and the formation of clusters. ------------------------------------------------------------------------------------ 6829( 28) - 11/11/99 09:35 - [ 2] Observations Description ------------------------ We will take WFPC2 images of NGC 5461, NGC 5462, and NGC 5471 with the F656N filter for HAlpha images, F675W filter for continuum subtraction from the HAlpha line emission, and F547M filter for an emission-line-free continuum. For NGC 5471 we request additional observation with the filter F673N for a S II line emission image. The clusters in the these regions are brighter than V = 20 mag, so a 2 x 3 min exposure in F547M gives a S/N > 47. For the HAlpha images we use 24 min exposure with CR-SPLIT to optimize the efficiency of the orbit usage. This integration time is comparable to our WFPC2 observations of 30 Dor, so will reach a similar surface brightness levels. The undiluted S II/HAlpha ratio may be 0.5, so we need a whole orbit is needed for the S II image (with filter F673N). Real Time Justification ----------------------- None. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Paper Products: Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 6829( 28) - 11/11/99 09:35 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5461 EXT-MEDIUM, HII Region RA=14H 3M 41.2S +/- 0.1S, 2000.0 V=231 SURF-LINE(6563)=3.8e-14 DEC=54D 18' 51" +/- 0.5" 2 NGC5462 EXT-MEDIUM, HII REGION RA=14H 3M 53.61S +/- 0.1S, 2000.0 V=231 SURF-LINE(6563)=9.5e-15 DEC=54D 22' 18.8" +/- 0.5" 3 NGC5471 EXT-MEDIUM, HII Region RA=14H 4M 29.00S +/- 0.1S, 2000.0 V=231 SURF-LINE(6563)=1.1e-13 DEC=54D 23' 48.6" +/- 0.5" 4 NGC5461-NEW EXT-MEDIUM, HII Region RA=14H 3M 39.5S +/- 0.1S, 2000.0 V=231 SURF-LINE(6563)=3.8e-14 DEC=54D 19' 3.5" +/- 0.5" 5 NGC5462-NEW EXT-MEDIUM, HII Region RA=14H 3M 53.18S +/- 0.1S, 2000.0 V=231 SURF-LINE(6563)=9.5e-15 DEC=54D 21' 55.3" +/- 0.5" 6829( 28) - 11/11/99 09:35 - [ 4] Visit: 01 Visit Priority: Visit Requirements: PCS MODE FINE ORIENT 162D TO 194D 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5461 WFPC2 IMAGE WF2-FIX F656N 1 160 S GS ACQ SCENARIO SINGLE ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5461 WFPC2 IMAGE WF2-FIX F656N CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC5461 WFPC2 IMAGE WF2-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 800 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC5461 WFPC2 IMAGE WF2-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 100 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC5461 WFPC2 IMAGE WF2-FIX F675W 1 10 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC5461 WFPC2 IMAGE WF2-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC5461 WFPC2 IMAGE WF2-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 200 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC5461 WFPC2 IMAGE WF2-FIX F547M 1 20 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC5461 WFPC2 IMAGE PC1-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 40 S ------------------------------------------------------------------------------------------------------------------------------------ 6829( 28) - 11/11/99 09:35 - [ 5] Visit: 02 Visit Priority: Visit Requirements: PCS MODE FINE ORIENT 283D TO 329D 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5462 WFPC2 IMAGE WF2-FIX F656N 1 160 S GS ACQ SCENARIO SINGLE ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5462 WFPC2 IMAGE WF2-FIX F656N CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC5462 WFPC2 IMAGE WF2-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 800 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC5462 WFPC2 IMAGE WF2-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 100 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC5462 WFPC2 IMAGE WF2-FIX F675W 1 10 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC5462 WFPC2 IMAGE WF2-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC5462 WFPC2 IMAGE WF2-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 200 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC5462 WFPC2 IMAGE WF2-FIX F547M 1 20 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC5462-NEW WFPC2 IMAGE PC1-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 40 S Comments: recentering on brightest cluster candidate ------------------------------------------------------------------------------------------------------------------------------------ 6829( 28) - 11/11/99 09:35 - [ 6] Visit: 03 Visit Priority: Visit Requirements: PCS MODE FINE 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5471 WFPC2 IMAGE WF3-FIX F673N CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1400 S ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5471 WFPC2 IMAGE WF3-FIX F673N CR-SPLIT=NO 1 700 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC5471 WFPC2 IMAGE WF3-FIX F673N 1 300 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC5471 WFPC2 IMAGE WF3-FIX F656N 1 180 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC5471 WFPC2 IMAGE WF3-FIX F656N CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC5471 WFPC2 IMAGE WF3-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 800 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC5471 WFPC2 IMAGE WF3-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 100 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC5471 WFPC2 IMAGE WF3-FIX F675W 1 10 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC5471 WFPC2 IMAGE WF3-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC5471 WFPC2 IMAGE WF3-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 200 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC5471 WFPC2 IMAGE WF3-FIX F547M 1 20 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC5471 WFPC2 IMAGE PC1-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 40 S ------------------------------------------------------------------------------------------------------------------------------------ 6829( 28) - 11/11/99 09:35 - [ 7] Visit: 51 Visit Priority: Visit Requirements: PCS MODE FINE ORIENT 110D TO 150D 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5461-NEW WFPC2 IMAGE WF4-FIX F656N CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S GS ACQ SCENARIO SINGLE ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5461-NEW WFPC2 IMAGE WF4-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1100 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 6829( 28) - 11/11/99 09:35 - [ 8] Summary Form for Proposal 6829 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WF2-FIX PC1-FIX WF3-FIX WF4-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=0.5 CR-TOLERANCE=0.0 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE FINE ORIENT 162D TO 194D GS ACQ SCENARIO SINGLE SAME POS AS 1 PCS MODE FINE ORIENT 283D TO 329D PCS MODE FINE PCS MODE FINE ORIENT 110D TO 150D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F656N F675W F547M F673N ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC5461 NGC5462 NGC5462-NEW NGC5471 NGC5461-NEW ------------------------------------------------------------------------------------------------------------------------------------