10848( 2) - 05/12/06 14:29 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10848 Version: 2 Check-in Time: 12-May-2006 18:28:53 STScI Edit Number: Title Relating the host galaxies of type-2 quasars to their infrared properties ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 15 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Mark D. Lacy California Institute of Technology CoI: Dr. Lee Armus California Institute of Technology N CoI: Dr. Gabriela Canalizo University of California - Riverside N CoI: Ms. Andreea Petric Columbia University in the City of New N York CoI: Dr. Anna Sajina California Institute of Technology N CoI: Dr. Susan Ridgway The Johns Hopkins University N CoI: Dr. Nicholas Seymour Jet Propulsion Laboratory N CoI: Dr. L. J. Storrie-Lombardi Jet Propulsion Laboratory N ------------------------------------------------------------------------------------ Abstract The obscured quasar population has been found to consist of a wide variety of objects. In this proposal, we wish to study the host galaxies of six z~0.6 type-2 quasars selected via their mid-infrared emission. Infrared spectra and photometry of these objects show that they include both actively star-forming and non-starforming galaxies, and have dust columns to the AGN ranging from moderate to high. We will relate the host galaxy properties to the infrared properties of these type-2 quasars, and to the host galaxies of type-1 quasars of similar redshift and bolometric luminosity. These observations will thus help us to understand how the different types of obscured quasars are related to each other, and to the normal quasar population. ------------------------------------------------------------------------------------ 10848( 2) - 05/12/06 14:29 - [ 2] Observations Description ------------------------ The hosts of our type-2 quasars have i-magnitudes ranging from 18.7-20.7. Most of our imaging will be performed through the F775W and F475W filters (SDSS i and g), sampling each object either side of the 4000A break in the rest frame. For our two highest-redshift objects we will use F814W and F555W, both to keep the rest-wavelength approximately the same, and to help compensate for cosmological surface brightness dimming by using wider bandpasses. Our lowest- redshift object will be observed through F625W and F435W. In some cases our filters will include emission lines such as [OII]3727 and [OIII]5007, however, AGN-powered extended emission line nebulae on scales of kpc are rare in radio- quiet quasars, and we can include any contributions from low equivalent width [OII] and [OIII] emission from star formation in our spectral modeling. For our faintest, highest redshift host galaxies, we want to ensure a high enough signal-to-noise to be able to detect faint features and measure an accurate host galaxy magnitude. The i=20.7 magnitude host galaxy of our most distant quasar-2, if it has an effective radius or 0.5'' (i.e. ~5kpc), will have a surface brightness of approx 23 mag/arcsec^2 at a radius of 0.5''. Using the ACS ETC, we can achieve a 6-sigma detection of this in a 2x2-pixel box in 4x500s of integration through the F814W filter, so a single orbit will suffice to obtain sufficiently deep, well-dithered data. The type-2 host galaxies to be observed through the F775W filter are at least 0.5 mag brighter, so will have similar or better signal-to-noise despite the smaller filter bandwidth. Because of the approx 4x increased sensitivity of the ACS WFC compared to WFPC2, we can achieve similar rest-frame surface brightness limits as, e.g., Dunlop et al. (2003) in their study of z~0.3 quasar hosts for our =0.6 sample, despite cosmological surface brightness dimming. We therefore expect to be similarly- sensitive to low surface brightness tidal features and other evidence galaxy interactions. In the shorter wavelength band, our worst case is a g=21.9 host galaxy observed through F475W, but even here we will be able to obtain a 3- sigma detection 0.5'' from the nucleus in a 2x2-pixel box in 4x500s of integration assuming the same host galaxy scale size, so again one orbit per object should suffice in the short wavelength filter. With the resolution of ACS, we will be probing kpc-scale structures in the host galaxies. If, as expected, our host galaxies show star-forming knots and other discrete features, such as secondary nuclei, these will be even easier to detect than the diffuse stellar light of the older stellar population. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10848( 2) - 05/12/06 14:29 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SST171106.8+ GALAXY, QSO RA=17H11M6.8400S +/- 0.3", J2000 Z = V = 21.0 590436 DEC=+59D04'36.70" +/- 0.3" 0.462 Reference Frame: ICRS 2 SST171147.4+ GALAXY, QSO RA=17H11M47.4700S +/- 0.3", J2000 Z = 0.8 V = 22.0 585839 DEC=+58D58'39.80" +/- 0.3" Reference Frame: ICRS 3 SST171324.3+ GALAXY, QSO RA=17H13M24.1900S +/- 0.3", J2000 Z = V = 21.5 585549 DEC=+58D55'49.30" +/- 0.3" 0.609 Reference Frame: ICRS 4 SST171831.6+ GALAXY, QSO RA=17H18M31.7100S +/- 0.3", J2000 Z = 0.7 V = 21.5 595317 DEC=+59D53'17.30" +/- 0.3" Reference Frame: ICRS 5 SST172123.1+ GALAXY, QSO RA=17H21M23.1800S +/- 0.3", J2000 Z = V = 20.0 601214 DEC=+60D12'14.60" +/- 0.3" 0.325 Reference Frame: ICRS 6 SST172458.3+ GALAXY, QSO RA=17H24M58.3400S +/- 0.3", J2000 Z = V = 21.0 591545 DEC=+59D15'45.80" +/- 0.3" 0.494 Reference Frame: ICRS 10848( 2) - 05/12/06 14:29 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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 ------------------------------------------------------------------------------------------------------------------------------------ 10848( 2) - 05/12/06 14:29 - [ 5] Visit: 01 Visit Priority: Visit Requirements: ORIENT 15.0D TO 360.0 D On Hold Comments: Additional Comments: Orient requirements are to avoid bright star in WF2 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SST171106.8 ACS/WFC ACCUM WFC1 F775W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 1 +590436 ------------------------------------------------------------------------------------------------------------------------------------ 2 SST171106.8 ACS/WFC ACCUM WFC1 F475W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 2 +590436 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 | ------------------------------------------------------------------------------------------------------------------------------------ SST171106.8+590436 1 ACS/WFC ACCUM WFC1 F775W 1 none none none 1 N/A SST171106.8+590436 1 ACS/WFC ACCUM WFC1 F775W 2 none none none 1 N/A SST171106.8+590436 1 ACS/WFC ACCUM WFC1 F775W 3 none none none 1 N/A SST171106.8+590436 1 ACS/WFC ACCUM WFC1 F775W 4 none none none 1 N/A SST171106.8+590436 2 ACS/WFC ACCUM WFC1 F475W 1 none none none 2 559.0 S SST171106.8+590436 2 ACS/WFC ACCUM WFC1 F475W 2 none none none 2 559.0 S SST171106.8+590436 2 ACS/WFC ACCUM WFC1 F475W 3 none none none 2 559.0 S SST171106.8+590436 2 ACS/WFC ACCUM WFC1 F475W 4 none none none 2 559.0 S 10848( 2) - 05/12/06 14:29 - [ 6] Visit: 02 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 SST171147.4 ACS/WFC ACCUM WFC1 F814W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 1 +585839 ------------------------------------------------------------------------------------------------------------------------------------ 2 SST171147.4 ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 2 +585839 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 | ------------------------------------------------------------------------------------------------------------------------------------ SST171147.4+585839 1 ACS/WFC ACCUM WFC1 F814W 1 none none none 1 N/A SST171147.4+585839 1 ACS/WFC ACCUM WFC1 F814W 2 none none none 1 N/A SST171147.4+585839 1 ACS/WFC ACCUM WFC1 F814W 3 none none none 1 N/A SST171147.4+585839 1 ACS/WFC ACCUM WFC1 F814W 4 none none none 1 N/A SST171147.4+585839 2 ACS/WFC ACCUM WFC1 F555W 1 none none none 2 555.0 S SST171147.4+585839 2 ACS/WFC ACCUM WFC1 F555W 2 none none none 2 555.0 S SST171147.4+585839 2 ACS/WFC ACCUM WFC1 F555W 3 none none none 2 555.0 S SST171147.4+585839 2 ACS/WFC ACCUM WFC1 F555W 4 none none none 2 555.0 S 10848( 2) - 05/12/06 14:29 - [ 7] Visit: 03 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 SST171324.3 ACS/WFC ACCUM WFC1 F775W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 1 +585549 ------------------------------------------------------------------------------------------------------------------------------------ 2 SST171324.3 ACS/WFC ACCUM WFC1 F475W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 2 +585549 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 | ------------------------------------------------------------------------------------------------------------------------------------ SST171324.3+585549 1 ACS/WFC ACCUM WFC1 F775W 1 none none none 1 N/A SST171324.3+585549 1 ACS/WFC ACCUM WFC1 F775W 2 none none none 1 N/A SST171324.3+585549 1 ACS/WFC ACCUM WFC1 F775W 3 none none none 1 N/A SST171324.3+585549 1 ACS/WFC ACCUM WFC1 F775W 4 none none none 1 N/A SST171324.3+585549 2 ACS/WFC ACCUM WFC1 F475W 1 none none none 2 559.0 S SST171324.3+585549 2 ACS/WFC ACCUM WFC1 F475W 2 none none none 2 559.0 S SST171324.3+585549 2 ACS/WFC ACCUM WFC1 F475W 3 none none none 2 559.0 S SST171324.3+585549 2 ACS/WFC ACCUM WFC1 F475W 4 none none none 2 559.0 S 10848( 2) - 05/12/06 14:29 - [ 8] Visit: 04 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 SST171831.6 ACS/WFC ACCUM WFC1 F775W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 1 +595317 ------------------------------------------------------------------------------------------------------------------------------------ 2 SST171831.6 ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 2 +595317 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 | ------------------------------------------------------------------------------------------------------------------------------------ SST171831.6+595317 1 ACS/WFC ACCUM WFC1 F775W 1 none none none 1 N/A SST171831.6+595317 1 ACS/WFC ACCUM WFC1 F775W 2 none none none 1 N/A SST171831.6+595317 1 ACS/WFC ACCUM WFC1 F775W 3 none none none 1 N/A SST171831.6+595317 1 ACS/WFC ACCUM WFC1 F775W 4 none none none 1 N/A SST171831.6+595317 2 ACS/WFC ACCUM WFC1 F555W 1 none none none 2 559.0 S SST171831.6+595317 2 ACS/WFC ACCUM WFC1 F555W 2 none none none 2 559.0 S SST171831.6+595317 2 ACS/WFC ACCUM WFC1 F555W 3 none none none 2 559.0 S SST171831.6+595317 2 ACS/WFC ACCUM WFC1 F555W 4 none none none 2 559.0 S 10848( 2) - 05/12/06 14:29 - [ 9] Visit: 05 Visit Priority: Visit Requirements: ORIENT 0.0D TO 20.0 D; ORIENT 60.0D TO 120.0 D; ORIENT 140.0D TO 165.0 D; ORIENT 280.0D TO 290.0 D; ORIENT 320.0D TO 359.99 D On Hold Comments: Additional Comments: Orient requirements are to avoid bleed trails along columns and rows from nearby bright star. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SST172123.1 ACS/WFC ACCUM WFC1 F625W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 1 +601214 see below ------------------------------------------------------------------------------------------------------------------------------------ 2 SST172123.1 ACS/WFC ACCUM WFC1 F435W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 2 +601214 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 | ------------------------------------------------------------------------------------------------------------------------------------ SST172123.1+601214 1 ACS/WFC ACCUM WFC1 F625W 1 none none none 1 545.0 S SST172123.1+601214 1 ACS/WFC ACCUM WFC1 F625W 2 none none none 1 545.0 S SST172123.1+601214 1 ACS/WFC ACCUM WFC1 F625W 3 none none none 1 545.0 S SST172123.1+601214 1 ACS/WFC ACCUM WFC1 F625W 4 none none none 1 545.0 S SST172123.1+601214 2 ACS/WFC ACCUM WFC1 F435W 1 none none none 2 557.0 S SST172123.1+601214 2 ACS/WFC ACCUM WFC1 F435W 2 none none none 2 557.0 S SST172123.1+601214 2 ACS/WFC ACCUM WFC1 F435W 3 none none none 2 557.0 S SST172123.1+601214 2 ACS/WFC ACCUM WFC1 F435W 4 none none none 2 557.0 S 10848( 2) - 05/12/06 14:29 - [ 10] Visit: 06 Visit Priority: Visit Requirements: ORIENT 0.0D TO 110.0 D; ORIENT 270.0D TO 359.99 D On Hold Comments: Additional Comments: Orient requirements are to avoid bright stars in WF2. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SST172458.3 ACS/WFC ACCUM WFC1 F775W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 1 +591545 ------------------------------------------------------------------------------------------------------------------------------------ 2 SST172458.3 ACS/WFC ACCUM WFC1 F475W CR-SPLIT=NO,GAIN=2 1 540 S PATTERN 1 2 +591545 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 | ------------------------------------------------------------------------------------------------------------------------------------ SST172458.3+591545 1 ACS/WFC ACCUM WFC1 F775W 1 none none none 1 N/A SST172458.3+591545 1 ACS/WFC ACCUM WFC1 F775W 2 none none none 1 N/A SST172458.3+591545 1 ACS/WFC ACCUM WFC1 F775W 3 none none none 1 N/A SST172458.3+591545 1 ACS/WFC ACCUM WFC1 F775W 4 none none none 1 N/A SST172458.3+591545 2 ACS/WFC ACCUM WFC1 F475W 1 none none none 2 559.0 S SST172458.3+591545 2 ACS/WFC ACCUM WFC1 F475W 2 none none none 2 559.0 S SST172458.3+591545 2 ACS/WFC ACCUM WFC1 F475W 3 none none none 2 559.0 S SST172458.3+591545 2 ACS/WFC ACCUM WFC1 F475W 4 none none none 2 559.0 S 10848( 2) - 05/12/06 14:29 - [ 11] Summary Form for Proposal 10848 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO GAIN=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 15.0D TO 360.0 D; PATTERN 1 1; PATTERN 1 2; ORIENT 0.0D TO 20.0 D; ORIENT 60.0D TO 120.0 D; ORIENT 140.0D TO 165.0 D; ORIENT 280.0D TO 290.0 D; ORIENT 320.0D TO 359.99 D; ORIENT 0.0D TO 110.0 D; ORIENT 270.0D TO 359.99 D; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F775W F475W F814W F555W F625W F435W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SST171106.8+590436 SST171147.4+585839 SST171324.3+585549 SST171831.6+595317 SST172123.1+601214 SST172458.3+591545 ------------------------------------------------------------------------------------------------------------------------------------