13399( 5) - 14-Oct-2013 17:13:27 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13399 Version: 5 Check-in Time: 14-Oct-2013 17:13:27 STScI Edit Number: 1 Title Spatially Resolved WFC3/Grism Spectral Line Imaging of Gravitational Lensed Herschel-selected Luminous Dusty Starbursts ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Asantha Cooray University of California - Irvine Y CoI: Dr. Hai Fu University of California - Irvine N CoI: Dr. Julie Wardlow University of California - Irvine N CoI: Dr. Mattia Negrello Open University N CoI: Dr. Dominik A. Riechers Cornell University N CoI: Dr. Shane Bussmann Harvard University N CoI: Prof. Rob Ivison Royal Observatory Edinburgh N CoI: Dr. Paul van der Werf Universiteit Leiden N CoI: Dr. Stephen Serjeant Open University N CoI: Dr. Ismael Perez-Fournon Instituto de Astrofisica de Canarias N CoI: Dr. Kristen Coppin McGill University N CoI: Dr. Helmut Dannerbauer CEA/DSM/DAPNIA/Service d'Astrophysique N CoI: Dr. Aprajita Verma University of Oxford N CoI: Dr. Pasquale Temi NASA Ames Research Center N CoI: Dr. Edo Ibar Pontificia Universidad Catolica de Chile N CoI: Prof. Lerothodi L Leeuw University of South Africa N CoI: Dr. Filiberto G. Braglia Imperial College of Science Technology and N Medicine CoI: Dr. Joaquin Gonzalez-Nuevo Instituto de Fisica de Cantabria N CoI: Dr. Neil Nagar Osservatorio Astrofisico di Arcetri N CoI: Mr. Hugo Messias Universidad de Concepcion N CoI: Jae Alyson Calanog University of California - Irvine N CoI: Dr. Alexandre Amblard NASA Ames Research Center N CoI: Dr. Dave Clements Imperial College of Science Technology and N Medicine CoI: Dr. Mattia Vaccari Universita degli Studi di Padova N CoI: Prof. Steve Eales University of Wales, College of Cardiff N (UWCC) CoI: Dr. Andrea Lapi Scuola Internazionale Superiore di Studi N Avanzati CoI: Dr. Lucia Marchetti Open University N ------------------------------------------------------------------------------------ Abstract We propose WFC3 G102 and G141 grism spectral imaging of two gravitationally lensed dusty, starburst galaxies found with the 600 square degree Herschel-ATLAS survey. One galaxy is the brightest (both in far-IR at 250 micron and in near-IR in J/K-band), while the second is the largest (11 arcsec on the sky) of the lensed sub-mm galaxies in a sample of 200 imaged with WFC3/F110W. The two galaxies are at redshifts that are optimal for grism observations with HST/WFC3. The lensing flux magnification and spatial enhancement makes them very unique for the study proposed here and will increase the number of lensed galaxies imaged in spectral lines with WFC3 13399( 5) - 14-Oct-2013 17:13:27 - [ 2] grisms to three from existing single serendipitous lens studied in HST-3D survey. With WFC3 grism spectra taken in a specific orientation to minimize foreground and lensing galaxy confusion we can map each of these galaxies in a variety of spatially-resolved spectral lines in the rest-frame optical, including impostant Balmer lines for studies on the interstellar medium. The grism spectra will allow us to determine the gas-phase metallicities of these two galaxies and to study the extinction of optically-thin regions compared to direct sub-mm emission seen in interferometric continuum images of optically thick dust in starbursting knots and clumps. With spatial resolution provided by gravitational lensing combined with HST/WFC3 resolution, we will be able to study the dependence of line ratios in high density/SFR regions to low dense diffuse environments. ------------------------------------------------------------------------------------ Observations Description ------------------------ The program is related to rest-frame optical spectro-imaging of two lensed starbursting galaxies (G15.19 at z=1.06 and NB.43 at z=1.667) found with Herschel. The two lensed galaxies are near-IR bright and spans 3 arcsec Einstein ring in G15.19 to a giant arc of 11 arcsec long in NB.43. The most basic goals of this program are (i) Obtain spatially resolved imaging in multiple spectral lines to study the line intensity variations across two starburst galaxies within the ISM in at least 20 spatial resolution elements (i.e., independent spectral pixels). (ii) Derive extinction corrections using either Halpha/Hbeta (G15.19 at z = 1.026) or Hbeta/Hgamma (NB.43 at z = 1.677) at multiple locations within the galaxy. Compare and contrast with the spatial distribution of optically-thick dust extinction directly seen with high-resolution sub-mm dust emission maps from ALMA (G15.19) and SMA (NB.43/G15.19). (iii) Derive gas-phase metallicities of these two galaxies with either R23 or O23 ratios, and study any differences in the rest UV and optical line intensities and line ratios relative to the gas and SFR surface densities of these galaxies derived from mm-wave interferometeric observations. To achieve these science goals we make use of both G141 and G102 grisms of WFC3. To align grism spectra on the sky we also take deep images following the guidelines of the WFC3 handbook. We use F160W and F105W. We have used the on-line calculator to estimate the exposure time necessary to detect the Halpha or Hbeta from each of the G102 or G141 spectra of the two sources. The times are such that we need to spend 2 orbits on G15.19 and 3 orbits on NB.43. Real Time Justification ----------------------- To minimize the source overlap in grism spectra and to separate the lensed starbursting galaxy from the foreground lens, these grism observations require certain ranges in orientation. These were described in the original science proposal. We do not need to do orthogonal grism observations as the sources we are studying are bright and the contamination can be minimized over a range of 13399( 5) - 14-Oct-2013 17:13:27 - [ 3] PA. The request ranges were calculated based on the orientation and the angle between the WFC3/grism dispersion direction and the U3 roll angle. To allow a range of possible scheduling options, we have left +/- 30 degrees from the preferred position angle for observations. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13399( 5) - 14-Oct-2013 17:13:27 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 G15.19 GALAXY, GRAVITATIONAL RA=14H29M35.3112S +/- 0.1", J2000 K-band AB = 18 LENS, STARBURST DEC=-00D28'36.74" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 NB.43 GALAXY, GRAVITATIONAL RA=13H24M26.9462S +/- 0.5", J2000 K-band AB = 20.5 LENS, STARBURST DEC=+28D44'52.43" +/- 0.5" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13399( 5) - 14-Oct-2013 17:13:27 - [ 5] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.636 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13399( 5) - 14-Oct-2013 17:13:27 - [ 6] Visit: 01 Visit Requirements: ORIENT 255D TO 285 D; ORIENT 75D TO 105 D; VISIBILITY INTERVAL 52 M 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 G15.19 WFC3/IR MULTIAC GRISM1024 F160W NSAMP=6, SAMP-SEQ=SPARS50 1 DEF GS ACQ SCENARIO SINGLE CUM (252.935 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 G15.19 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=14, SAMP-SEQ=SPARS100 1 DEF PATTERN 1 2-4 CUM (2605.873 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 G15.19 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=4, SAMP-SEQ=SPARS50 1 DEF CUM (305.867 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 G15.19 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=10, SAMP-SEQ=SPARS100 1 DEF CUM (1805.87 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 G15.19 WFC3/IR MULTIAC GRISM1024 F105W SAMP-SEQ=SPARS50, NSAMP=8 1 DEF CUM (352.935 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ G15.19 1 WFC3/IR MULTIAC GRISM102 F160W none none none none 1 N/A CUM 4 G15.19 2 WFC3/IR MULTIAC GRISM102 G102 1 none none none 1 N/A CUM 4 G15.19 2 WFC3/IR MULTIAC GRISM102 G102 2 none none none 2 N/A CUM 4 G15.19 3 WFC3/IR MULTIAC GRISM102 G102 1 none none none 1 N/A CUM 4 G15.19 3 WFC3/IR MULTIAC GRISM102 G102 2 none none none 2 N/A CUM 4 G15.19 4 WFC3/IR MULTIAC GRISM102 G141 1 none none none 1 N/A CUM 4 G15.19 4 WFC3/IR MULTIAC GRISM102 G141 2 none none none 2 N/A CUM 4 G15.19 5 WFC3/IR MULTIAC GRISM102 F105W none none none none 2 N/A CUM 4 13399( 5) - 14-Oct-2013 17:13:27 - [ 7] Visit: 02 Visit Requirements: ORIENT 330D TO 30 D; ORIENT 150D TO 210 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NB.43 WFC3/IR MULTIAC GRISM1024 F160W NSAMP=8, SAMP-SEQ=SPARS50 1 DEF CUM (352.935 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NB.43 WFC3/IR MULTIAC GRISM1024 G102 NSAMP=13, SAMP-SEQ=SPARS100 1 DEF PATTERN 1 2-3 CUM (2405.872 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NB.43 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=13, SAMP-SEQ=SPARS100 1 DEF CUM (2405.872 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NB.43 WFC3/IR MULTIAC GRISM1024 F105W SAMP-SEQ=SPARS50, NSAMP=10 1 DEF CUM (452.936 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NB.43 WFC3/IR MULTIAC GRISM1024 G102 SAMP-SEQ=SPARS100, NSAMP=8 2 DEF PATTERN 1 5 CUM (2811.738 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NB.43 1 WFC3/IR MULTIAC GRISM102 F160W none none none none 1 N/A CUM 4 NB.43 2 WFC3/IR MULTIAC GRISM102 G102 1 none none none 1 N/A CUM 4 NB.43 2 WFC3/IR MULTIAC GRISM102 G102 2 none none none 2 N/A CUM 4 NB.43 3 WFC3/IR MULTIAC GRISM102 G141 1 none none none 1 N/A CUM 4 NB.43 3 WFC3/IR MULTIAC GRISM102 G141 2 none none none 2 N/A CUM 4 NB.43 4 WFC3/IR MULTIAC GRISM102 F105W none none none none 2 N/A CUM 4 NB.43 5 WFC3/IR MULTIAC GRISM102 G102 1 none 1 none 3 N/A CUM 4 NB.43 5 WFC3/IR MULTIAC GRISM102 G102 1 none 2 none 3 N/A CUM 4 13399( 5) - 14-Oct-2013 17:13:27 - [ 8] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NB.43 5 WFC3/IR MULTIAC GRISM102 G102 2 none 1 none 3 N/A CUM 4 NB.43 5 WFC3/IR MULTIAC GRISM102 G102 2 none 2 none 3 N/A CUM 4 13399( 5) - 14-Oct-2013 17:13:27 - [ 9] Summary Form for Proposal 13399 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures GRISM1024 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=10, NSAMP=13, NSAMP=14, NSAMP=4, NSAMP=6, NSAMP=8, SAMP-SEQ=SPARS100, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO SINGLE, ORIENT 150D TO 210 D, ORIENT 255D TO 285 D, ORIENT 330D TO 30 D, ORIENT 75D TO 105 D, PATTERN 1 2-3, PATTERN 1 2-4, PATTERN 1 5, VISIBILITY INTERVAL 52 M ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F105W, F160W, G102, G141 ------------------------------------------------------------------------------------------------------------------------------------ Target Names G15.19, NB.43 ------------------------------------------------------------------------------------------------------------------------------------