! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5965,v 5.1 1995/04/14 15:32:14 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: Doug Van Orsow ! Phone: 410 338-4568 , E-mail: vanorsow@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Date generated: Sun Dec 18 09:42:50 EST 1994 ! Proposal_Information ! Section 4 Title: Towards H_o: relative astrometry of the lensing galaxy and the gravitationally lensed images in 0218+357 Proposal_Category: GO Scientific_Category: Quasars Cycle: 5 Investigators PI_name: Ian Browne PI_Institution: NRAL Jodrell Bank CoI_Name: Alok Patnaik CoI_Institution: MPIfR Bonn Contact: N ! Y or N (designate at most one contact) CoI_Name: Peter Wilkinson CoI_Institution: NRAL Jodrell Bank Contact: N ! Y or N (designate at most one contact) CoI_Name: Sunita Nair CoI_Institution: NRAL Jodrell Bank Contact: N ! Y or N (designate at most one contact) CoI_Name: Neal Jackson CoI_Institution: NRAL Jodrell Bank Contact: Y ! Y or N (designate at most one contact) CoI_Name: Elizabeth Corbett CoI_Institution: NRAL Jodrell Bank Contact: N ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose an imaging observation of the smallest known gravitational lensed system 0218+357. This system is unique in having a well determined time delay between the two lensed images and a simple lensing geometry. The redshift of the lensing galaxy is known although the redshift of the lensed object has yet to be determined. Almost all the ingredients necessary for an accurate determination of the Hubble Constant are therefore available for this object. To achieve this it is important to eliminate as many sources of uncertainty as possible; a major source of error can be removed by better constraints on the position and orientation of the lensing galaxy relative to the lensed images. This is impossible to do from the ground due to the 0.335 arcsec separation of the lensed images and consequent difficulty in disentangling the emission from the images from that of the lensing galaxy. We propose a brief HST imaging observation which will allow us to do this. Questions ! Free format text (please update) Observing_Description: The observations are aimed at detecting and imaging an extended galaxy with integrated magnitudes in V down to about 20 to 21. In the 555 filter this will produce about 2 electrons per second in the central pixel assuming a redshift of 0.6847 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 42 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 26 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 the lensing galaxy. The point sources will be easily detected in the short (~1 min) exposures. Real_Time_Justification: We are actively trying to obtain a redshift for the lensed object in 0218+357 using observations with the WHT. Another group has Palomar 5m data and is aiming to obtain Keck data. VLBI images of the source have been obtained at two frequencies (Patnaik et al, 1994, Compact Extragalactic Radio Sources, eds Kellermann & Zensus). Meanwhile more radio monitoring data have been collected and the delay determination is being refined. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number:1 Target_Name:QSO-022105+355613 Alternate_Names:B0218+357 Description:GALAXY Position:RA=2H 21M 5.47S +/- 0.01S, DEC=35D 56' 13.7" +/- 0.1" Equinox:J2000 RV_or_Z: RA_PM:0.0 ! Units are seconds of time per year Dec_PM:0.0 ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux:R=19.5 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 On_Hold_Comments: Visit_Comments: Exposure_Number:1 ! Section 6.5 Target_Name:QSO-022105+355613 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:60S Special_Requirements:SEQ 1-3 NON-INT ! Section 7.2 Comments: Exposure_Number:2 ! Section 6.5 Target_Name:QSO-022105+355613 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F555W Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:1000S Special_Requirements: Comments: Exposure_Number:3 ! Section 6.5 Target_Name:QSO-022105+355613 Config:WFPC2 Opmode:IMAGE Aperture:PC1 Sp_Element:F814W Wavelength: Optional_Parameters: Number_of_Iterations:1 Time_Per_Exposure:1000S Special_Requirements: Comments: Data_Distribution ! Defaults indicated; change if desired Medium: 8MM ! 8MM or 6250BPI or 1600BPI Blocking_Factor: 10 ! 10 or 1 ! Only astronomers with very old 9- ! track tape drives should consider ! a blocking factor of 1 Ship_To: PI_Address ! STSCI or PI_Address or ! PI Address from Phase I is: ! ! Lower Withington,Macclesfield, ! Cheshire SK11 9DL,England ! ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! Overnight shipping done at PI expense Recipient_Email: ! Needed if Ship_To: is not PI_Address ! ! Let us know what you think of this template and software! ! 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