! Proposal 6629, submission 1 ! PI: Neal Jackson ! Received Wed Feb 14 07:31:17 EST 1996 ! From: njj@jb.man.ac.uk ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6629,v 3.1 1996/02/20 15:45:51 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6629,v 3.1 1996/02/20 15:45:51 pepsa Exp $ ! ! Refer to the HST Phase II Proposal Instructions to fill this out ! ! Anything after a "!" is ignored, and may be deleted ! ! All keywords with multiple entries are comma delimited except the ! Visit_Requirements and Special_Requirements keywords which can be ! delimited with carriage returns or semi-colons, but not commas ! ! For help call your Program Coordinator: Bremmer ! Phone: 410-338-4458 , E-mail: bremmer@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: archive-0612.jackson.prop ! Date generated: Fri Dec 22 15:40:13 EST 1995 ! Proposal_Information ! Section 4 Title: Observations of a new sample of gravitational lens candidates Proposal_Category: GO Scientific_Category: COSMOLOGY Cycle: 6 Investigators PI_name: Neal Jackson PI_Institution: Nuffield Radio Astronomy Laboratories, Jodrell Bank, University of Manchester CoI_Name: Ian Browne CoI_Institution: NRAL Jodrell Bank Contact: ! Y or N (designate at most one contact) CoI_Name: Peter Wilkinson CoI_Institution: NRAL Jodrell Bank Contact: ! Y or N (designate at most one contact) CoI_Name: Sunita Nair CoI_Institution: NRAL Jodrell Bank Contact: ! Y or N (designate at most one contact) CoI_Name: Steve Myers CoI_Institution: Caltech Contact: ! Y or N (designate at most one contact) CoI_Name: Tony Readhead CoI_Institution: Caltech Contact: ! Y or N (designate at most one contact) CoI_Name: Tim Pearson CoI_Institution: Caltech Contact: ! Y or N (designate at most one contact) CoI_Name: Roger Blandford CoI_Institution: Caltech Contact: ! Y or N (designate at most one contact) CoI_Name: Chris Fassnacht CoI_Institution: Caltech Contact: ! Y or N (designate at most one contact) CoI_Name: George Miley CoI_Institution: Leiden Observatory Contact: ! Y or N (designate at most one contact) CoI_Name: Ger de Bruyn CoI_Institution: Dwingeloo Contact: ! Y or N (designate at most one contact) CoI_Name: Richard Schilizzi CoI_Institution: Dwingeloo Contact: ! Y or N (designate at most one contact) CoI_Name: Malcolm Bremer CoI_Institution: Leiden Observatory Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) gravitational lens candidates from the Cosmic Lens All-Sky Survey (CLASS) made with the VLA. The first phase of CLASS yielded two new gravitational lenses and two virtually certain candidates. All four are being followed up in Cycle 5. We now propose to investigate three more objects, two more from the first phase and one more from the recently completed second phase of CLASS. Statistically we would expect 14 lensed objects from the ~7000 targets already surveyed, based on our earlier survey which shows that 1 in 500 sources are lensed. All three new targets have multiple compact (<=30mas) flat radio spectrum components and have separations which make them difficult to study from the ground. Therefore they are uniquely suited to the capabilities of the HST. Our primary aims are to confirm the lens status by finding optical counterpatrs to the images and to identify Questions ! Free format text (please update) Observing_Description: The observations are aimed at detecting point objects of magnitude 20 together with extended galaxies of integrated magnitudes down to about 20 to 21. In the 555 filter the point object will produce about 55 electrons per second. An extended galaxy of similar brightness will produce about 2 electrons per second in the central pixel assuming a redshift of about 0.6 and using the curve of figure 6.1. in the WFPC2 handbook. The figures for the 814 filter are roughly similar. We propose to take two exposures in each filter: one short (so as not to saturate on the point sources) and one long in order to search for any lensing galaxy. The available observing time per orbit is between 43 and 47 minutes, taking into account occultation and guide star acquisition. Allowing 16 minutes for exposure overheads (one CR-SPLIT and one NO-CR -SPLIT in each filter) this gives between 27 and 31 minutes for science exposures. In the deeper exposure in each filter we will therefore obtain about 12-15 minutes' integration. This will be enough to collect 1400 electrons in the central pixel of any lensing galaxy. The point sources will be easily detected in the short (~1 min) exposures (note that objects listed as magnitude >20 will almost certainly be <21.5 as they are flat spectrum radio sources). Real_Time_Justification: We are conducting imaging and spectroscopic observations with the Keck and Palomar telescope for optical ground based followup of the lens candidates, and the wide--separation lens in figure 1 was confirmed using the William Herschel Telescope on La Palma. These ground based telescopes are not adequate for the investigation suggested here for the reasons presented above. MERLIN and VLBA will be used for radio followup of suspected lenses. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number:1 Target_Name:QSO-204720+264402 Alternate_Names: Description:GALAXY Position:RA=20H 47M 20.339S +/- 0.1S, DEC=26D 44' 02.15" +/- 1" Equinox:J2000 RV_or_Z: Flux:V=20 +/- 1 Comments: Target_Number:2 Target_Name:QSO-103334+071126 Alternate_Names: Description:GALAXY Position:RA=10H 33M 34.025S +/- 0.1S, DEC=07D 11' 26.12" +/- 1" Equinox:J2000 RV_or_Z: Flux:V=20 +/- 1 Comments: Target_Number:3 Target_Name:QSO-113000+381203 Alternate_Names: Description:GALAXY Position:RA=11H 30M 00.090S +/- 0.1S, DEC=38D 12' 03.10" +/- 1" Equinox:J2000 RV_or_Z: Flux:V=20 +/- 1 Comments: ! This is a template for a single visit containing a single exposure ! Repeat exposure and visit blocks as needed Visits ! Section 6 Visit_Number:1 Visit_Requirements: ! Section 7.1 ! ORIENTation TO On_Hold_Comments: Visit_Comments: Exposure_Number:20 ! Section 6.5 Target_Name:QSO-204720+264402 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:1000S Special_Requirements: ! Section 7.2 Comments: Exposure_Number:30 ! Section 6.5 Target_Name:QSO-204720+264402 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:1000S Special_Requirements: ! Section 7.2 Comments: Visits ! Section 6 Visit_Number:2 Visit_Requirements: ! Section 7.1 ! ORIENTation TO On_Hold_Comments: Visit_Comments: Exposure_Number:50 ! Section 6.5 Target_Name:QSO-103334+071126 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:1000S Special_Requirements: ! Section 7.2 Comments: Exposure_Number:60 ! Section 6.5 Target_Name:QSO-103334+071126 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:1000S Special_Requirements: ! Section 7.2 Comments: Visits ! Section 6 Visit_Number:3 Visit_Requirements: ! Section 7.1 ! ORIENTation TO On_Hold_Comments: Visit_Comments: Exposure_Number:80 ! Section 6.5 Target_Name:QSO-113000+381203 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:1000S Special_Requirements: ! Section 7.2 Comments: Exposure_Number:90 ! Section 6.5 Target_Name:QSO-113000+381203 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:1000S Special_Requirements: ! Section 7.2 Comments: Data_Distribution ! Defaults indicated; change if desired Medium: 8MM ! 8MM or 6250BPI or 1600BPI Blocking_Factor: 10 ! 10 or 1 ! 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