10591( 10) - 11/23/05 10:30 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10591 Version: 10 Check-in Time: 23-Nov-2005 15:29:37 Title ACS Observations of the Galaxies in A Giant Ly-alpha Nebula at z~2.7 ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 14 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Arjun Dey National Optical Astronomy Observatories, AURA CoI: Dr. Buell T. Jannuzi National Optical Astronomy Observatories, N AURA CoI: Dr. Marcia J. Rieke University of Arizona N CoI: Dr. Baruch T. Soifer California Institute of Technology N CoI: Dr. Daniel W. Weedman The Pennsylvania State University N CoI: Mr. Chao Bian California Institute of Technology N CoI: Dr. Katherine Brand National Optical Astronomy Observatories, Y AURA CoI: Dr. Mark Brodwin Jet Propulsion Laboratory N CoI: Dr. Michael J. I. Brown Princeton University N CoI: Dr. Frederic Chaffee California Association for Research in N Astronomy (CARA) CoI: Dr. Vandana Desai California Institute of Technology N CoI: Dr. Peter Eisenhardt Jet Propulsion Laboratory N CoI: Dr. Emeric Le Floc'h University of Arizona N CoI: Dr. Grant Hill California Association for Research in N Astronomy (CARA) CoI: Dr. James Houck Cornell University N ------------------------------------------------------------------------------------ Abstract Giant Ly-alpha nebulae appear to be sites of ongoing massive galaxy formation, as evidenced by their association with very luminous, young, star-forming galaxies and large galaxy overdensities. However the origin of the extended gas and the source of ionization remain mysterious. We have discovered a ~200 kpc size nebula which appears to contain a number of embedded sources, including a very obscured, luminous mid-infrared source and a Lyman break galaxy. We propose to obtain deep ACS and NICMOS images of this nebula in order to: (i) determine the spatial morphology of the Ly-alpha emission on sub-kpc scales; (ii) precisely locate the known continuum sources within the nebula; (ii) determine their morphologies; (iii) detect the source of ionizing photons at the very center of the nebula; (iv) constrain the ionizing luminosity contributed by a possible distributed population of faint, compact continuum sources in the nebula; and (v) by SED fitting of population synthesis models, constrain the ages of the ionizing sources with the aim of determining the timescale of the galaxy formation process in the nebula. ------------------------------------------------------------------------------------ 10591( 10) - 11/23/05 10:30 - [ 2] Observations Description ------------------------ We will be observing a large Lya nebula with HST for 23 orbits. Our observations are split into 11 orbits with ACS WFC (3 orbits for a broad-band observation through the F606W filter, 5 orbits through the narrow-band FR462N ramp filter centered at 4448A and 3 orbits through the narrow-band FR601N ramp filter centered at 5998A) and 12 orbits with NICMOS NIC2 (6 orbits each through the broad-band F110W and F160W filters). The primary goals of the ACS observations are to (i) precisely locate the bright continuum sources in the nebula relative to the peaks in the line emission, (ii) determine the number and distribution of the fainter ionizing sources, through a comparison of Ly- alpha, HeII and deep continuum imaging, and (iii) to measure the morphologies of the brighter objects in the field that are associated with the nebula. The primary goal of the NICMOS observations is to constrain the SED of the continuum sources detected in the ACS observations and provide confirmation that these faint sources truly are associated with the nebula. The details of the observing for each instrument and filter are below: 1. ACS/WFC Imaging F606W - 3 orbits We will take 6 exposures - 2 exposures per orbit (approximately 1300s per exposure). We will use the default ACS-WFC dither box for the first 4 exposures centered on aperture WFC1, and use similar offsets (in different directions) for the remaining 2 exposures. We have no orientation restrictions for these exposures. 2. ACS-WFC Ramp filter FR462N (center @ 4448A) - 5 orbits We will take 10 exposures - 2 exposures per orbit (approximately 1300s per exposure). We will use the compact ACS-WFC dither box for the 1st 4 exposures and then perform another 4 exposures with the same ditter pattern but with the pattern centered. The remaining 2 exposures are with similar positional offsets but in different directions. We require the orientation to be between 270 and 360 degrees. 3. ACS/WFC Ramp filter F601N (center at 5998A) - 3 orbits We will take 6 exposures (2 exposures per orbit). We will use the compact ACS-WFC dither box for the first 4 exposures and then offset by a similar amount in different directions for the remaining 2 exposures. We require the orientation to be between 270 and 360 degrees. 4. NIC2 Imaging F110W - 6 orbits We will obtain 6 exposures (1 exposure per orbit). We will use the NIC-spiral dither pattern with 0.6375 point spacing beginning at nic2-fix. We will run the instrument in MULTIACCUM mode with SPARS256 and Nsamp=13. We will restrict the orientation to 230-130 to ensure no part of our extended source falls on the coronagraphic hole. 5. NIC2 Imaging F160W - 6 orbits We will obtain 6 exposures (1 exposure per orbit). We will use the NIC-spiral dither pattern with 0.6375 point spacing beginning at nic2-fix. We will run the instrument in MULTIACCUM mode with SPARS256 and NSAMP=13. We will restrict the orientation to 230-130 degrees to ensure no part of our extended source falls on the coronagraphic hole. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments 10591( 10) - 11/23/05 10:30 - [ 3] ------------------- ------------------------------------------------------------------------------------ 10591( 10) - 11/23/05 10:30 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 OBJ- GALAXY, LYMAN ALPHA RA=14H34M10.9770S +/- 0.1", J2000 Z = V = 27.0 1434110+3317 CLOUD, PROTOGALAXY, DEC=+33D17'30.87" +/- 0.1" 2.656 F-LINE(5998)=4.07+/-0.04E-17 33 STARBURST, F-LINE(4448)=2E-15 ULTRALUMINOUS IR GAL, Coordinate Source: Other_Source: NOAO Deep Wide-Field Survey Comments: We have carried out a comparison between the NDWFS coordinates and GSC2.2 coordinates for 98 stars in the field of the Lya nebula. We found the median offsets between the two frames to be (deltaRA, deltaDEC) = (0.022,-0.063) arcsec (in the sense that the NDWFS astrometric system is east and south of the GSC2.2 astrometric system. This difference is so small that we chose not to apply any correction to the NDWFS astrometry. 10591( 10) - 11/23/05 10:30 - [ 5] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type NIC-SPIRAL-DITH Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.6375 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 0.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.104 Line_Spacing 0.053 Coordinate_Frame POS-TARG Pattern_Orient 18.79 Angle_Between_Sides 80.79 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.104 Line_Spacing 0.053 Coordinate_Frame POS-TARG Pattern_Orient 18.79 Angle_Between_Sides 80.79 Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 10591( 10) - 11/23/05 10:30 - [ 6] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 5 Primary_Pattern Secondary_Pattern Pattern_Type NIC-SPIRAL-DITH Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.6375 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 180.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10591( 10) - 11/23/05 10:30 - [ 7] Visit: 01 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OBJ-1434110 ACS/WFC ACCUM WFC1 F606W CR-SPLIT=NO 1 1000 S PATTERN 4 1 +331733 see below ------------------------------------------------------------------------------------------------------------------------------------ 2 OBJ-1434110 ACS/WFC ACCUM WFC1 F606W CR-SPLIT=NO 1 1200 S POS TARG -0.124,-0.14 +331733 see below ------------------------------------------------------------------------------------------------------------------------------------ 3 OBJ-1434110 ACS/WFC ACCUM WFC1 F606W CR-SPLIT=NO 1 1200 S POS TARG -0.248, 0.094 +331733 see below ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OBJ-1434110+331733 1 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 1262.0 S OBJ-1434110+331733 1 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 1280.0 S OBJ-1434110+331733 1 ACS/WFC ACCUM WFC1 F606W 3 none none none 2 1302.0 S OBJ-1434110+331733 1 ACS/WFC ACCUM WFC1 F606W 4 none none none 2 1302.0 S OBJ-1434110+331733 2 ACS/WFC ACCUM WFC1 F606W none none none none 3 1302.0 S OBJ-1434110+331733 3 ACS/WFC ACCUM WFC1 F606W none none none none 3 1302.0 S 10591( 10) - 11/23/05 10:30 - [ 8] Visit: 02 Visit Priority: Visit Requirements: ORIENT 270.0D TO 360.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OBJ-1434110 ACS/WFC ACCUM WFC FR462N 4448 CR-SPLIT=NO 1 1400 S PATTERN 2 1 +331733 see below ------------------------------------------------------------------------------------------------------------------------------------ 2 OBJ-1434110 ACS/WFC ACCUM WFC FR462N 4448 CR-SPLIT=NO 1 1400 S POS TARG 0.023, 0; +331733 see below PATTERN 3 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 OBJ-1434110 ACS/WFC ACCUM WFC FR462N 4448 CR-SPLIT=NO 1 1300 S POS TARG -0.099, 0.033 +331733 see below ------------------------------------------------------------------------------------------------------------------------------------ 4 OBJ-1434110 ACS/WFC ACCUM WFC FR462N 4448 CR-SPLIT=NO 1 1300 S POS TARG -0.099, 0.08 +331733 see below ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OBJ-1434110+331733 1 ACS/WFC ACCUM WFC FR462N 4448 1 none none none 1 1271.0 S OBJ-1434110+331733 1 ACS/WFC ACCUM WFC FR462N 4448 2 none none none 1 1271.0 S OBJ-1434110+331733 1 ACS/WFC ACCUM WFC FR462N 4448 3 none none none 2 1302.0 S OBJ-1434110+331733 1 ACS/WFC ACCUM WFC FR462N 4448 4 none none none 2 1302.0 S OBJ-1434110+331733 2 ACS/WFC ACCUM WFC FR462N 4448 1 none none none 3 1292.0 S OBJ-1434110+331733 2 ACS/WFC ACCUM WFC FR462N 4448 2 none none none 3 1292.0 S OBJ-1434110+331733 2 ACS/WFC ACCUM WFC FR462N 4448 3 none none none 4 1302.0 S OBJ-1434110+331733 2 ACS/WFC ACCUM WFC FR462N 4448 4 none none none 4 1302.0 S OBJ-1434110+331733 3 ACS/WFC ACCUM WFC FR462N 4448 none none none none 5 1312.0 S OBJ-1434110+331733 4 ACS/WFC ACCUM WFC FR462N 4448 none none none none 5 1312.0 S 10591( 10) - 11/23/05 10:30 - [ 9] Visit: 03 Visit Priority: Visit Requirements: SAME ORIENT AS 02 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OBJ-1434110 ACS/WFC ACCUM WFC FR601N 5998 CR-SPLIT=NO 1 1300 S PATTERN 2 1 +331733 see below ------------------------------------------------------------------------------------------------------------------------------------ 2 OBJ-1434110 ACS/WFC ACCUM WFC FR601N 5998 CR-SPLIT=NO 1 1300 S POS TARG -0.099, 0.033 +331733 see below ------------------------------------------------------------------------------------------------------------------------------------ 3 OBJ-1434110 ACS/WFC ACCUM WFC FR601N 5998 CR-SPLIT=NO 1 1300 S POS TARG -0.099,-0.08 +331733 see below ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OBJ-1434110+331733 1 ACS/WFC ACCUM WFC FR601N 5998 1 none none none 1 1271.0 S OBJ-1434110+331733 1 ACS/WFC ACCUM WFC FR601N 5998 2 none none none 1 1271.0 S OBJ-1434110+331733 1 ACS/WFC ACCUM WFC FR601N 5998 3 none none none 2 1302.0 S OBJ-1434110+331733 1 ACS/WFC ACCUM WFC FR601N 5998 4 none none none 2 1302.0 S OBJ-1434110+331733 2 ACS/WFC ACCUM WFC FR601N 5998 none none none none 3 1302.0 S OBJ-1434110+331733 3 ACS/WFC ACCUM WFC FR601N 5998 none none none none 3 1302.0 S 10591( 10) - 11/23/05 10:30 - [ 10] Visit: 04 Visit Priority: Visit Requirements: ORIENT 230.0D TO 130.0 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OBJ-1434110 NIC2 MULTIAC NIC2-FIX F110W NSAMP=13,SAMP-SEQ=SPARS256 1 DEF GS ACQ SCENARIO BASE1TNS; +331733 CUM PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F110W 1 none none none 1 N/A CUM OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F110W 2 none none none 2 N/A CUM OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F110W 3 none none none 3 N/A CUM 10591( 10) - 11/23/05 10:30 - [ 11] Visit: 05 Visit Priority: Visit Requirements: SAME ORIENT AS 04 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OBJ-1434110 NIC2 MULTIAC NIC2-FIX F110W NSAMP=13,SAMP-SEQ=SPARS256 1 DEF POS TARG 0, 0.6375; GS +331733 CUM ACQ SCENARIO BASE1TNS; PATTERN 5 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F110W 1 none none none 1 N/A CUM OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F110W 2 none none none 2 N/A CUM OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F110W 3 none none none 3 N/A CUM 10591( 10) - 11/23/05 10:30 - [ 12] Visit: 06 Visit Priority: Visit Requirements: SAME ORIENT AS 04 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OBJ-1434110 NIC2 MULTIAC NIC2-FIX F160W NSAMP=13,SAMP-SEQ=SPARS256 1 DEF GS ACQ SCENARIO BASE1TNS; +331733 CUM PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F160W 1 none none none 1 N/A CUM OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F160W 2 none none none 2 N/A CUM OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F160W 3 none none none 3 N/A CUM 10591( 10) - 11/23/05 10:30 - [ 13] Visit: 07 Visit Priority: Visit Requirements: SAME ORIENT AS 04 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 OBJ-1434110 NIC2 MULTIAC NIC2-FIX F160W NSAMP=13,SAMP-SEQ=SPARS256 1 DEF POS TARG 0, 0.6375; GS +331733 CUM ACQ SCENARIO BASE1TNS; PATTERN 5 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F160W 1 none none none 1 N/A CUM OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F160W 2 none none none 2 N/A CUM OBJ-1434110+331733 1 NIC2 MULTIAC NIC2-FIX F160W 3 none none none 3 N/A CUM 10591( 10) - 11/23/05 10:30 - [ 14] Summary Form for Proposal 10591 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1 WFC NIC2-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC NIC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO NSAMP=13 SAMP-SEQ=SPARS256 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 4 1; POS TARG -0.124,-0.14; POS TARG -0.248, 0.094; ORIENT 270.0D TO 360.0 D; PATTERN 2 1; POS TARG 0.023, 0; PATTERN 3 2; POS TARG -0.099, 0.033; POS TARG -0.099, 0.08; SAME ORIENT AS 02; POS TARG -0.099,-0.08; ORIENT 230.0D TO 130.0 D; GS ACQ SCENARIO BASE1TNS; PATTERN 1 1; SAME ORIENT AS 04; POS TARG 0, 0.6375; PATTERN 5 1; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W FR462N FR601N F110W F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names OBJ-1434110+331733 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 4448 5998 ------------------------------------------------------------------------------------------------------------------------------------