6829( 7) - 09/11/97 14:26 - [ 1]
PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only
ID: 6829
Version: 7
Check-in Date: 02-Sep-1997
13:22:52
1.Proposal Title:
The Luminous Giant HII Regions in M101
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2. Scientific Category 3. Proposal For 4. Cycle
INTERSTELLAR MEDIUM GO 6
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5. Investigators
Contact?
PI: YOU-HUA CHU UNIVERSITY OF ILLINOIS
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
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6. 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.
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6829( 7) - 09/11/97 14:26 - [ 2]
Observations Description
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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
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None.
Calibration Justification
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Additional Comments
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Data Distribution
Media: 8MM
Blocking Factor: 10
Ship To: PI_Address
Ship Via: UPS
Email:
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6829( 7) - 09/11/97 14:26 - [ 3]
TARGET LIST a) Fixed Targets
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Tar| Target | Target | Target |Coord | Radial | Flux data
No | Name | Description | Position |Eqnx | Vel. |
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1 NGC5461 EXT-MEDIUM, HII Region RA=14H 03M 40.23S +/- 0.1S, 2000.0 V=231 SURF-LINE(6563)=3.8e-14
DEC=54D 18' 57.2" +/- 0.5"
2 NGC5462 EXT-MEDIUM, HII Region RA=14H 03M 53.18S +/- 0.1S, 2000.0 V=231 SURF-LINE(6563)=9.5e-15
DEC=54D 21' 55.3" +/- 0.5"
3 NGC5471 EXT-MEDIUM, HII Region RA=14H 04M 29.00S +/- 0.1S, 2000.0 V=231 SURF-LINE(6563)=1.1e-13
DEC=54D 23' 48.6" +/- 0.5"
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Visit: 01
Visit Priority: <none>
Visit Requirements: PCS MODE Fine ORIENTation 355D TO 5D
On Hold Comments: <none>
Additional Comments: <none>
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
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1 NGC5461 WFPC2 IMAGE WF2-FIX F656N 1 160 S
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2 NGC5461 WFPC2 IMAGE WF2-FIX F656N CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POSition AS 1
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3 NGC5461 WFPC2 IMAGE WF2-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 800 S SAME POSition AS 1
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4 NGC5461 WFPC2 IMAGE WF2-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 100 S SAME POSition AS 1
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5 NGC5461 WFPC2 IMAGE WF2-FIX F675W 1 10 S SAME POSition AS 1
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6 NGC5461 WFPC2 IMAGE WF2-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POSition AS 1
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7 NGC5461 WFPC2 IMAGE WF2-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 200 S SAME POSition AS 1
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8 NGC5461 WFPC2 IMAGE WF2-FIX F547M 1 20 S SAME POSition AS 1
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9 NGC5461 WFPC2 IMAGE PC1-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 40 S
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Visit: 02
Visit Priority: <none>
Visit Requirements: PCS MODE Fine ORIENTation 305D TO 315D
On Hold Comments: <none>
Additional Comments: <none>
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
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1 NGC5462 WFPC2 IMAGE WF4-FIX F656N 1 160 S
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2 NGC5462 WFPC2 IMAGE WF4-FIX F656N CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POSition AS 1
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3 NGC5462 WFPC2 IMAGE WF4-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 800 S SAME POSition AS 1
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4 NGC5462 WFPC2 IMAGE WF4-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 100 S SAME POSition AS 1
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5 NGC5462 WFPC2 IMAGE WF4-FIX F675W 1 10 S SAME POSition AS 1
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6 NGC5462 WFPC2 IMAGE WF4-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POSition AS 1
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7 NGC5462 WFPC2 IMAGE WF4-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 200 S SAME POSition AS 1
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8 NGC5462 WFPC2 IMAGE WF4-FIX F547M 1 20 S SAME POSition AS 1
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9 NGC5462 WFPC2 IMAGE PC1-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 40 S
Comments: recentering on brightest cluster candidate
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6829( 7) - 09/11/97 14:26 - [ 6]
Visit: 03
Visit Priority: <none>
Visit Requirements: PCS MODE Fine
On Hold Comments: <none>
Additional Comments: <none>
Exposures
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Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special
Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements
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1 NGC5471 WFPC2 IMAGE WF3-FIX F673N CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1400 S
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2 NGC5471 WFPC2 IMAGE WF3-FIX F673N CR-SPLIT=NO 1 700 S SAME POSition AS 1
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3 NGC5471 WFPC2 IMAGE WF3-FIX F673N 1 300 S SAME POSition AS 1
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4 NGC5471 WFPC2 IMAGE WF3-FIX F656N 1 180 S SAME POSition AS 1
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5 NGC5471 WFPC2 IMAGE WF3-FIX F656N CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POSition AS 1
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6 NGC5471 WFPC2 IMAGE WF3-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 800 S SAME POSition AS 1
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7 NGC5471 WFPC2 IMAGE WF3-FIX F675W CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 100 S SAME POSition AS 1
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8 NGC5471 WFPC2 IMAGE WF3-FIX F675W 1 10 S SAME POSition AS 1
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9 NGC5471 WFPC2 IMAGE WF3-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 1200 S SAME POSition AS 1
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10 NGC5471 WFPC2 IMAGE WF3-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 200 S SAME POSition AS 1
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11 NGC5471 WFPC2 IMAGE WF3-FIX F547M 1 20 S SAME POSition AS 1
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12 NGC5471 WFPC2 IMAGE PC1-FIX F547M CR-SPLIT=0.5,CR-TOLERANCE=0.0 1 40 S
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6829( 7) - 09/11/97 14:26 - [ 7]
Summary Form for Proposal 6829
Item Used in this proposal
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Configurations WFPC2
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Opmodes IMAGE
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Optional Parameters CR-SPLIT=0.5 CR-TOLERANCE=0.0 CR-SPLIT=NO
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Proposal Category GO
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Scientific Category INTERSTELLAR MEDIUM
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Special Requirements PCS MODE Fine ORIENTation 355D TO 5D SAME POSition AS 1 PCS MODE Fine ORIENTation 305D TO 315D PCS
MODE Fine
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Spectral Elements F656N F675W F547M F673N
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Target Names NGC5461 NGC5462 NGC5471
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