! Proposal 6602, submission 1 ! PI: Ian Browne ! Received Fri Feb 9 13:31:45 EST 1996 ! From: njj@jb.man.ac.uk ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6602,v 8.1 1997/03/11 16:10:51 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6602,v 8.1 1997/03/11 16:10:51 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: van Orsow ! Phone: 410-338-4568 , E-mail: vanorsow@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: archive-0540.browne.prop ! Date generated: Fri Dec 22 18:53:43 EST 1995 ! Proposal_Information ! Section 4 Title: B2114+022: a gravitational lens system and/or an example of multiple active nuclei? Proposal_Category: GO Scientific_Category: COSMOLOGY Cycle: 6 Investigators PI_name: Ian Browne PI_Institution: Nuffield Radio Astronomy Laboratories 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: Pedro Augusto CoI_Institution: NRAL Jodrell Bank 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: Donna Womble CoI_Institution: Caltech Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose to image the radio source B2114+022 with the prime objective of finding out whether or not the unique configuration of radio images is a result of gravitational lensing. The object was observed in the Jodrell Bank -- VLA Astrometric Survey (JVAS) of flat spectrum radio sources and found to consist of four compact (<= 20mas) components. Three of the components form an equilateral triangle and lie within 300 mas of each other, while the fourth is 2 arcsec away. The components all have flat spectra but they are not identical. The geometry is atypical of that produced by gravitational lensing. Hence, though lensing is probably contributing to the complexity of the radio image, it may not be the whole story. Extended optical emission has been detected from the ground and may be a blend of a lensing galaxy and lensed images. HST observations will enable us to check this and other possibilities. . Questions ! Free format text (please update) Observing_Description: The observations are aimed at detecting point sources of magnitude 20 or fainter, together with extended galaxy emission of integrated magnitude of 19. In the 555 filter a magnitude 20 point source will produce about 55 electrons per second. The extended galaxy will produce about 2 electrons per second in the central pixel on the basis of 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 look for faint images and study the morphology of the 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 the lensing galaxy. The point sources will be easily detected in the short (~1 min) exposures. Real_Time_Justification: We have time allocated on the VLBA which we will use to make 1 mas resolution maps of the 2114+022 system. Hopefully these will reveal substructure in the images that can be used to constrain lensing models. We also intend to pursue the optical spectroscopy in order to check if the emission line is HAlpha and to look for other features which might be associated with a possible lensed object. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number:1 Target_Name:QSO-211650+022546 Alternate_Names: Description:GALAXY Position:RA=21H 16M 50.744S +/- 0.01S, DEC=02D 25' 46.26" +/- 0.1" 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 On_Hold_Comments: Visit_Comments: Exposure_Number:10 ! Section 6.5 Target_Name:QSO-211650+022546 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: Exposure_Number:15 ! Section 6.5 Target_Name:QSO-211650+022546 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:20 ! Section 6.5 Target_Name:QSO-211650+022546 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:25 ! Section 6.5 Target_Name:QSO-211650+022546 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: 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: ! ! Jodrell Bank ! Macclesfield ! SK11 9DL ! ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! Overnight shipping done at PI expense Recipient_Email: ! Needed if Ship_To: is not PI_Address ! ! 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