13818( 3) - 02-Oct-2014 17:38:14 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13818 Version: 3 Check-in Time: 02-Oct-2014 17:38:14 STScI Edit Number: 0 Title Probing Quasar Host Galaxy of a Quasar at z=2.1 with Damped Lyman Alpha System as Coronagraph ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Mr. Zheng Cai University of Arizona Y CoI: Prof. Xiaohui Fan University of Arizona N CoI: Ms. Hayley Finley CNRS, Institut d'Astrophysique de Paris N CoI: Prof. Zheng Zheng University of Utah N CoI: Dr. Patrick Petitjean CNRS, Institut d'Astrophysique de Paris N CoI: Dr. Pasquier Noterdaeme CNRS, Institut d'Astrophysique de Paris N CoI: Dr. Sebastian Lopez Universidad de Chile N CoI: Dr. Ian McGreer University of Arizona N CoI: Dr. Isabelle Paris CNRS, Institut d'Astrophysique de Paris N CoI: Dr. Raghunathan Srianand Inter-University Centre for Astronomy and N Astrophysics CoI: Dr. Ran Wang University of Arizona N ------------------------------------------------------------------------------------ Abstract Fully resolving high-redshift quasar host galaxies is crucial for understanding how massive galaxies and their central black holes form and evolve. However, studies of high-redshift quasar host galaxies are hindered by difficulties in isolating the hosts and accurately subtracting the strong emission from quasar nuclei. From the SDSS-III quasar spectra library, we have discovered a number of rare occurrences where strong damped Lyman alpha absorbers (DLAs) completely block the nuclear emission from the quasar; they act as a natural coronagraph and reveal narrow Ly-alpha emission from the quasar host galaxies. We propose to carry out HST/WFC3 narrow-band imaging of one such system, J1154-0215, at z=2.1. At this redshift, the WFC3/UVIS narrow-band filter FQ387N lies perfectly within the DLA dark trough, thereby enabling us to image the quasar host galaxy without the need for PSF subtraction. The FWHM and luminosity of the narrow Ly-alpha emission detected in this DLA trough are consistent with that of Lyman break galaxies. Our ground-based deep 2-D spectrum indicates that the Ly-alpha emission is marginally resolved under the seeing of 0.6'', suggesting that it is most likely powered by star formation from the quasar host galaxies. High resolution HST imaging, for the first time, will enable us to fully measure the morphology and physical properties of a type-1 quasar host down to the inner 1 kpc scale at z>2, free of PSF subtraction systematics. It will also probe florescent Ly-alpha emission from cool gas associated with the DLA, and study the gas inflows/outflows in the quasar environment to test models of feedback in quasar host galaxies and massive galaxy formation. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use one narrowband filter FQ387N to image one quasar J1154-0215. The quasar J1154-0215 has a strong Damped Lyman Alpha (DLA) system which completely blocks the strong nuclear emission from the quasar. The DLA acts as a natural 13818( 3) - 02-Oct-2014 17:38:14 - [ 2] coronagraph and will reveal the Lyman alpha (Lya) emission from the quasar host galaxies. We will observe this program with two-visit. The first visit contains 3-orbit. The second visit contains 3-orbit. (1) In the first visit, we do a three-point-dither to populate the first 3-orbit. We split each orbit into two sub-exposure using CR-SPIT=2 (2) In the second visit, we use a same three-point-dither to populate the next 3-orbit. We split each orbit into two sub-exposure using CR-SPIT=2. We will first do a small POS-TARG offset of delta_x= 0'', delta_y=-0.135 when we start the second visit. We found that even with orbit-long individual exposure, the sky background of FQ387N narrowband will be much lower than the recommended threshold of 12e-/pixel. This low sky background will strong affect the charge transfer efficiency of the WFC3 UVIS detector. In order to obtain a threshold of 12e-/pixel background level which will improve the charge transfer efficiency, we will use a post-flash illumination with a intensity of 10e- for our 6-orbit observations. ------------------------------------------------------------------------------------ 13818( 3) - 02-Oct-2014 17:38:14 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 J1154-0215 GALAXY, LYMAN ALPHA RA=11H54M32.6700S, J2000 V = 21.4 +/- 0.1 CLOUD, QUASAR DEC=-02D15'37.99" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13818( 3) - 02-Oct-2014 17:38:14 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type LINE WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER DITHER Number_Of_Points 3 2 Point_Spacing 0.135 0.145 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 46.84 46.84 Angle_Between_Sides Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ 13818( 3) - 02-Oct-2014 17:38:14 - [ 5] Visit: 01 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J1154-0215 WFC3/UVI ACCUM UVIS-QUAD FQ387N FLASH=10.0 1 3000 S PATTERN 2 1 S see below (8463 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 | ------------------------------------------------------------------------------------------------------------------------------------ J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 1 1 none none 1 1374.0 S S D J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 1 2 none none 1 1373.0 S S D J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 2 1 none none 2 1429.0 S S D J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 2 2 none none 2 1429.0 S S D J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 3 1 none none 3 1429.0 S S D J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 3 2 none none 3 1429.0 S S D 13818( 3) - 02-Oct-2014 17:38:14 - [ 6] Visit: 02 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 J1154-0215 WFC3/UVI ACCUM UVIS-QUAD FQ387N FLASH=10.0 1 1430 S POS TARG 0, -0.135; S see below PATTERN 2 1 (8463 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 | ------------------------------------------------------------------------------------------------------------------------------------ J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 1 1 none none 1 1374.0 S S D J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 1 2 none none 1 1373.0 S S D J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 2 1 none none 2 1429 S S D J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 2 2 none none 2 1429 S S D J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 3 1 none none 3 1429 S S D J1154-0215 1 WFC3/UVI ACCUM UVIS-QUA FQ387N 3 2 none none 3 1429 S S D 13818( 3) - 02-Oct-2014 17:38:14 - [ 7] Summary Form for Proposal 13818 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-QUAD ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10.0 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 2 1, POS TARG 0, -0.135 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements FQ387N ------------------------------------------------------------------------------------------------------------------------------------ Target Names J1154-0215 ------------------------------------------------------------------------------------------------------------------------------------