12726( 5) - 12-Dec-2011 19:52:21 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12726 Version: 5 Check-in Time: 12-Dec-2011 19:52:21 STScI Edit Number: 1 Title Dissecting star formation and extinction in the brightest lensed galaxy ------------------------------------------------------------------------------------ Type Cycle GO 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jane R. Rigby NASA Goddard Space Flight Center CoI: Prof. Michael D. Gladders University of Chicago N CoI: Dr. Keren Sharon University of Chicago N CoI: Ms. Eva Wuyts University of Chicago N CoI: Mr. Matthew Bayliss University of Chicago N ------------------------------------------------------------------------------------ Abstract Gravitational lensing provides rare chances to study high-redshift galaxies in otherwise unobtainable ways. We propose to study a spectacular lensed galaxy that is not only exceptionally bright, but has redshifted H-alpha and H-beta into narrow-band filters on HST. We have already obtained H-beta and broad-band filters. We originally proposed to map H-alpha with NICMOS, but have submitted a change request to switch to G141 grating observations, to measure the ratio of H gamma to H beta, and its spatial variation, in order to map the extinction over this remarkably bright z=1.7 lensed galaxy. ------------------------------------------------------------------------------------ Observations Description ------------------------ We are using the WFC3 G141 grism to measure the ratio of Hbeta to Hgamma across this giant (38") lensed arc. As justified in the Program Change Request, 4 orbits gives a simulated signal-to-noise ratio of >50 which is sufficient to measure the extinction to a precision of +-0.12 mag on A_v. We use two different roll angles to minimize crowding from cluster galaxies, and do two dither positions at each roll angle. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- As the PII instructions request, we here explain how we calculate ORIENT, and ask STScI to check our math, please! We assume the G141 grating disperses along the +X axis on the detector; **PLEASE TELL US** if this false. We measure the sky position angle (E of N) we want to run along the +X axis. We add the value from Table 7.4 of the PIIpI of 225.18 degrees, appropriate for the +X direction 12726( 5) - 12-Dec-2011 19:52:21 - [ 2] of WFC3-IR. This should be ORIENT. ------------------------------------------------------------------------------------ 12726( 5) - 12-Dec-2011 19:52:21 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 RCS0327 GALAXY, EMISSION LINE RA=03H27M27.4820S +/- 1", J2000 Z = 1.70 V = 19.15 +/- 0.1 r=19.0 NEBULA, GRAVITATIONAL DEC=-13D26'14.52" +/- 1" LENS, HIGH REDSHIFT GALAXY Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 12726( 5) - 12-Dec-2011 19:52:21 - [ 4] Visit: 01 Visit Requirements: ORIENT 80D TO 82 D On Hold Comments: Additional Comments: See comments in Proposal Description for discussion of ORIENT. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 RCS0327 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=14, SAMP-SEQ=SPARS200 1 DEF GS ACQ SCENARIO BASE1B3; CUM SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 RCS0327 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF CUM Comments: HELP! Manual says to set aperture to G141-REF for direct image, but this is not an option!!!*** ------------------------------------------------------------------------------------------------------------------------------------ 3 RCS0327 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=14, SAMP-SEQ=SPARS200 1 DEF POS TARG 3.5, 3.5; SEQ CUM 3-4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 4 RCS0327 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=14, SAMP-SEQ=SPARS25 1 DEF POS TARG 3.5, 3.5 CUM Comments: HELP! Manual says to set aperture to G141-REF for direct image, but this is not an option!!!*** ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ RCS0327 1 WFC3/IR MULTIAC GRISM102 G141 none none none none 1 N/A CUM 4 RCS0327 2 WFC3/IR MULTIAC GRISM102 F140W none none none none 1 N/A CUM 4 RCS0327 3 WFC3/IR MULTIAC GRISM102 G141 none none none none 2 N/A CUM 4 RCS0327 4 WFC3/IR MULTIAC GRISM102 F140W none none none none 2 N/A CUM 4 12726( 5) - 12-Dec-2011 19:52:21 - [ 5] Visit: 02 Visit Requirements: ORIENT 86.18D TO 87.18 D On Hold Comments: Additional Comments: See comments in Proposal Description for discussion of ORIENT. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 RCS0327 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=14, SAMP-SEQ=SPARS200 1 DEF GS ACQ SCENARIO BASE1B3; CUM SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 RCS0327 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF CUM Comments: HELP! Manual says to set aperture to G141-REF for direct image, but this is not an option!!!*** ------------------------------------------------------------------------------------------------------------------------------------ 3 RCS0327 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=14, SAMP-SEQ=SPARS200 1 DEF POS TARG 3.5, 3.5; SEQ CUM 3-4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 4 RCS0327 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=14, SAMP-SEQ=SPARS25 1 DEF POS TARG 3.5, 3.5 CUM Comments: HELP! Manual says to set aperture to G141-REF for direct image, but this is not an option!!!*** ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ RCS0327 1 WFC3/IR MULTIAC GRISM102 G141 none none none none 1 N/A CUM 4 RCS0327 2 WFC3/IR MULTIAC GRISM102 F140W none none none none 1 N/A CUM 4 RCS0327 3 WFC3/IR MULTIAC GRISM102 G141 none none none none 2 N/A CUM 4 RCS0327 4 WFC3/IR MULTIAC GRISM102 F140W none none none none 2 N/A CUM 4 12726( 5) - 12-Dec-2011 19:52:21 - [ 6] Summary Form for Proposal 12726 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures GRISM1024 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=10, NSAMP=14, SAMP-SEQ=SPARS200, SAMP-SEQ=SPARS25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3, ORIENT 80D TO 82 D, ORIENT 86.18D TO 87.18 D, POS TARG 3.5, 3.5, SEQ 1-2 NON-INT, SEQ 3-4 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F140W, G141 ------------------------------------------------------------------------------------------------------------------------------------ Target Names RCS0327 ------------------------------------------------------------------------------------------------------------------------------------