! Dear Peg, ! I have no easy access here to the RPS2 program. Could you submit this ! proposal for me??? ! ! Thanks, Jean ! Proposal 5958, submission 4 ! PI: Jean Surdej ! Received Fri May 3 11:50:17 EDT 1996 ! From: surdej@stsci.edu ! +====================+ ! | PED OUTPUT PRODUCT | ! +====================+ ! ! /capella/data2/peggy/5958/5958.prop ! Generated by PREPROCESSOR, version 2.0 ! Date: Thu Sep 14 08:13:02 EDT 1995 Proposal_Information Title: HST OBSERVATIONS OF NEW GRAVITATIONAL LENS CANDIDATES Proposal_Category: GO Scientific_Category: Quasars Cycle: 5 Investigators PI_Name: Jean Surdej PI_Institution: Space Telescope Science Institute CoI_Name: Jean-Francois Claeskens CoI_Institution: European Southern Observatory, La Silla Contact: CoI_Name: Marc Remy CoI_Institution: Institut d'Astrophysique de Liege Contact: CoI_Name: Benoit Pirenne CoI_Institution: Space Telescope European Coordinating Facility, Garching bei Muenchen Contact: CoI_Name: Almudena Prieto CoI_Institution: MPI fuer Extraterrestrische Physik, Garching bei Muenchen Contact: CoI_Name: Sjur Refsdal CoI_Institution: Hamburg Observatory Contact: CoI_Name: Christian Vanderriest CoI_Institution: Canada-France-Hawaii Telescope Corporation Contact: Abstract: Two new promising cases of multiply imaged quasars (J03.13 A and B and HE1104--180 A and B) have recently been identified in the framework of systematic optical surveys for gravitational lenses carried out at the European Southern Observatory. Furthermore, following a careful re-analysis (numerical PSF subtraction) of a sample of WFPC planetary camera frames obtained for 41 selected highly luminous quasars within the HST snapshot survey, we have identified several good gravitational lens candidates among which 0956+1217. For several of these candidates, individual spectra of the resolved QSO images have never been obtained. The lens has not yet been identified for most of them. No direct imagery at high angular resolution (<= 0.1") exists for the two first candidates. The interesting structures seen for the best HST candidate need to be confirmed. Taking advantage of the excellent angular resolution of HST, we propose to obtain FOS spectra and to directly image with the WFPC2 planetary camera these new gravitational lens candidates in order to identify their real physical nature (lensed or not lensed) and to set important constraints on the lensing (or other) models. Questions Observing_Description: We should like to image the new gravitational lens candidates described in the previous section at high angular resolution and with a dynamic range as large as possible in order to search for very faint image structures (cf. yet undetected lensed image(s), lensing galaxy, etc.) at angular separations as small as 0.1'' from the multiple QSO images. Because of the very large dynamic range requested for these observations and also the need for some direct imaging in the red (search for the lensing galaxy and/or other intervening galaxies, cluster, etc.), we find that the WFPC2 planetary camera is the most appropriate instrument for our needs. Our strategy to optimally detect faint structures at small angular separations will be to obtain at least 4 (usually 5) exposures, slightly offset, for each gravitational lens candidate, in two spectral bands (using for instance the recommended WFPC2 F555W and F814W filters which have good transmission, are very broad and are contiguous in wavelength). Multiple offset exposures are requested in order to be able to discriminate secondary images against cosmic rays, to better handle the CCD pixel response function, to better sample, construct and subtract an optimal point spread function (subsequently used for multiple images decomposition and/or image deconvolution; see Hjorth and Jensen 1993, in the proceedings of the 31st Liege International Astrophysical Colloquium, p. 103), to improve our detectability of very faint structures with an acceptable signal-to-noise ratio (S/N app. 5--10) and, to absolutely avoid saturation of the brightest QSO images. Two different spectral bands are necessary because we need to derive at least one color to discriminate for instance lensed images against intervening ones, when testing the gravitational lensing hypothesis. In addition, for the gravitational lens candidate J03.13, we shall directly check the spectral similarity (lensed? or not lensed?) of the A and B images by taking FOS spectra with the grating G650L (wide spectral coverage) and the 0.5" circular aperture. Requesting a signal-to-noise ratio of app. 20 per resolution element and considering a dark count rate of 0.013 count/sec/diode in the FOS/RED mode, the HST + FOS + COSTAR efficiency E_Lambda versus Lambda (see Fig. 1.2.1 in the HST FOS Instrument Handbook), the throughput of the 0.5'' single circular aperture (Fig. 1.2.2. in the same reference), the corresponding FOS line width of app. 25 Angstrom, a representative wavelength of 5200 Angstrom, the V apparent magnitude of the QSO images and a spectral index Alpha = +1 to characterize their spectral energy distribution, we have derived the exposure times for each QSO image. We find that for a V = 17.3, 18.1, 19.4 and 20.6 mag. QSO image, the requested exposure times are of the order of 5, 10, 30 and 90 min., respectively. The individual targets: J03.13 A & B: The brightest QSO image in this system has a visual magnitude of 17.3. In order not to saturate this (and all other) QSO image(s) on the PC frames observed with HST, we shall use the ADC channel with the 14 e/DN gain, which provides a digital full well of 53000 e. Setting the maximum number of collected electrons per pixel to 2/3 the value of the full well (i.e. 353333 e), it is easy to calculate the maximum allowable integration time when using the WFPC2 F555W and F814W filters: we find for V = 17.3 that t_max(F555W) = 200 sec. and t_max(F814W) = 600 sec. By resampling, registration and combination of the 5 (or sometimes 4) obtained CCD frames in each color, we have computed that a secondary image 7.3, 6.4 or 5 mag. fainter than the brightest QSO image should be detectable at an angular separation >= 0.4", = 0.25" or = 0.15", respectively (S/N app. 10 in the latter case). Taking into account the acquisition (and re- acquisition) of guide stars, the instrument overheads and the exposure times (5 x (200 + 600) sec.), 2 orbits are necessary to achieve the proposed direct imaging. In order to take the FOS spectra of the A and B QSO images (see above) and including the time for the acquisition (and re-acquisition) of guide stars and the instrument overheads, 3 additional orbits are necessary for the spectroscopy. A total of 5 orbits is thus requested to unravel the physical nature of this very good gravitational lens candidate. HE 1104-180 A, B &C: The brightest QSO image has a visual magnitude V = 16.5. It is then easy to estimate that t_max(F555W) = 100 sec. and t_max(F814W) = 350 sec. It is possible to record 3 (and 4) PC frames of HE 1104-180 with the F555W (and F814W) filters in just 1 orbit. 0956+1217: For this quasar, we have V = 17.6. It is then easy to calculate that t_max(F555W) = 260 sec. and t_max(F814W) = 900 sec. It is possible to record 3 (and 4) PC frames of 0956+1217 with the F555W (and F814W) filters in just 2 orbits. Real_Time_Justification: Calibration_Justification: We should like to get an early acquisition for J03.13 (which could be a triple image, i.e. A be made of two close double images A' and C, separated by less than 0.2"). We wish to be able to make use of calibration PSF stars with the WFPC2 (at the recommended PC1 position) F555W and F814W filters. Additional_Comments: We should like to get an early acquisition for J03.13 (which could be a triple image, i.e. A be made of two close double images A' and C, separated by less than 0.2"). We therefore request some 'Hold on' for the spectroscopic observations of J03.13. We are monitoring photometrically these gravitational lens candidates at ESO and CFH and, if necessary, we could readjust some of the proposed exposure times (mainly in order to avoid saturation of the QSO images on the PC frames and also when using the FOC). Fixed_Targets Target_Number: 1 Target_Name: J03.13A-OFFSET Alternate_Names: 1015-205A Description: GALAXY,QSO,GRAVITATIONAL LENS, Position: RA=10H 17M 23.9S +/- 0.1S,DEC=-20D 46' 58.70" +/- 1" Equinox: J2000 RV_or_Z: Z = 2.55 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: B = 17.6+/-0.2 R = 17.2+/-0.2 I = 16.9+/-0.2 Comments: Lensed QSO image (the brightest one) - coords updated 13 Sept 95 Target_Number: 2 Target_Name: J03.13B Alternate_Names: 1015-205B Description: GALAXY, QSO, Gravitational Lens Position: XI-OFF=-0.82"+/- 0.02",ETA-OFF=0.04"+/- 0.02",FROM 1 Equinox: 1950.0 RV_or_Z: Z = 2.55 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: B = 19.6+/-0.4 R = 19.3+/-0.3 I = 19.0+/-0.3 Comments: Lensed QSO image (the faintest one) Target_Number: 3 Target_Name: J03.13C Alternate_Names: 1015-205C Description: GALAXY, QSO, Gravitational Lens Position: XI-OFF=0.82"+/- 0.02",ETA-OFF=-0.04"+/- 0.02",FROM 1 Equinox: 1950.0 RV_or_Z: Z = 2.55 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: B = 21.0+/-1.0 R = 21.0+/-1.0 I = 21.0+/-1.0 Comments: Symetric position of B with respect to A (for contamination estimate of image B by A) Target_Number: 4 Target_Name: 0956+122 Alternate_Names: Description: GALAXY, QSO Position: RA=09H 56M 11.1S +/- 0.1S,DEC=12D 17' 07.0" +/- 1.5" Equinox: 1950.0 RV_or_Z: Z = 3.301 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: V = 17.6+/-0.5 B-V = 0.2+/-0.2 Comments: QSO Target_Number: 5 Target_Name: HE1104-1805 Alternate_Names: Description: GALAXY,QSO,GRAVITATIONAL LENS, Position: RA=11H 06M 33.48S +/- 0.1S,DEC=-18D 21' 25.0" +/- 1.0" Equinox: J2000 RV_or_Z: Z = 2.303 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: V = 16.5+/-0.5 I = 16.1+/-0.5 Comments: Multiply imaged QSO Target_Number: 6 Target_Name: H0449-1645 Alternate_Names: Description: GALAXY,QSO, Position: RA=04H 52M 14.21S +/- 0.1S,DEC=-16D 40' 17.0" +/- 1.0" Equinox: J2000.0 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: B = 18.0+/-1.0 Comments: QSO Target_Number: 7 Target_Name: J03.13A-OFFSET-NEW Alternate_Names: 1015-205A Description: GALAXY,QSO,GRAVITATIONAL LENS, Position: RA=10H 17M 23.839S +/- 0.02S, DEC=-20D 46' 58.40" +/- 0.3", PLATE-ID=01CQ Equinox: J2000 RV_or_Z: Z = 2.55 RA_PM: 0.0 Dec_PM: 0.0 Epoch: 1980.21 Annual_Parallax: 0.0 Flux: B = 17.6+/-0.2 R = 17.2+/-0.2 I = 16.9+/-0.2 Comments: Lensed QSO image (the brightest one) - coords updated 22 april1996 (JS) Target_Number: 8 Target_Name: J03.13B-NEW Alternate_Names: 1015-205B Description: GALAXY, QSO, Gravitational Lens Position: XI-OFF=-0.845"+/- 0.02",ETA-OFF=0.025"+/- 0.02",FROM 7 Equinox: J2000 RV_or_Z: Z = 2.55 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: B = 19.6+/-0.4 R = 19.3+/-0.3 I = 19.0+/-0.3 Comments: Lensed QSO image (the faintest one) Target_Number: 9 Target_Name: J03.13C-NEW Alternate_Names: 1015-205C Description: GALAXY, QSO, Gravitational Lens Position: XI-OFF=0.845"+/- 0.02",ETA-OFF=-0.025"+/- 0.02",FROM 7 Equinox: J2000 RV_or_Z: Z = 2.55 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: B = 21.0+/-1.0 R = 21.0+/-1.0 I = 21.0+/-1.0 Comments: Symetric position of B with respect to A (for contamination estimate of image B by A) Solar_System_Targets Generic_Targets Scan_Data Scan_Number: 1 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 160 Scan_Width: 1.14 Scan_Length: 1.14 Sides_Angle: 90.0 Number_Lines: 2 Scan_Rate: First_Line_PA: 36.1 Scan_Frame: S/C Length_Offset: Width_Offset: Scan_Number: 3 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 400 Scan_Width: 1.14 Scan_Length: 1.14 Sides_Angle: 90.0 Number_Lines: 2 Scan_Rate: First_Line_PA: 36.1 Scan_Frame: S/C Length_Offset: Width_Offset: Scan_Number: 7 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 200 Scan_Width: 1.14 Scan_Length: 1.14 Sides_Angle: 90.0 Number_Lines: 2 Scan_Rate: First_Line_PA: 36.1 Scan_Frame: S/C Length_Offset: Width_Offset: Visits Visit_Number: 01 Visit_Requirements: On_Hold_Comments: Visit_Comments: Early Acquisition for visit 4 Exposure_Number: 1 Target_Name: J03.13A-OFFSET Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 160S Special_Requirements: SPATIAL SCAN 1 Comments: Exposure_Number: 2 Target_Name: J03.13A-OFFSET Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 160S Special_Requirements: EXPAND MAX DUR 125% MIN DUR 75% Comments: Exposure_Number: 3 Target_Name: J03.13A-OFFSET Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 400S Special_Requirements: EXPAND MAX DUR 125% MIN DUR 75% Comments: Exposure_Number: 4 Target_Name: J03.13A-OFFSET Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 400S Special_Requirements: EXPAND MAX DUR 125% MIN DUR 75% END ORBIT Comments: Exposure_Number: 5 Target_Name: J03.13A-OFFSET Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 400S Special_Requirements: SPATIAL SCAN 3 Comments: Visit_Number: 02 Visit_Requirements: On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: 0956+122 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 160S Special_Requirements: SPATIAL SCAN 7 Comments: Exposure_Number: 2 Target_Name: 0956+122 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: EXPAND MAX DUR 125% MIN DUR 75% Comments: Exposure_Number: 3 Target_Name: 0956+122 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 500S Special_Requirements: EXPAND MAX DUR 125% MIN DUR 75% END ORBIT Comments: Visit_Number: 03 Visit_Requirements: On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: HE1104-1805 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 200S Special_Requirements: SPATIAL SCAN 7 Comments: Exposure_Number: 2 Target_Name: HE1104-1805 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CR-TOLERANCE=0.0,ATD-GAIN=15,CR-SPLIT=0.5 Number_of_Iterations: 1 Time_Per_Exposure: 200S Special_Requirements: Comments: Exposure_Number: 3 Target_Name: HE1104-1805 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F555W Wavelength: Optional_Parameters: CR-TOLERANCE=0.0,ATD-GAIN=15,CR-SPLIT=0.5 Number_of_Iterations: 1 Time_Per_Exposure: 200S Special_Requirements: Comments: Visit_Number: 04 Visit_Requirements: On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: J03.13A-OFFSET-NEW Config: FOS/RD Opmode: ACQ/PEAK Aperture: 4.3 Sp_Element: MIRROR Wavelength: Optional_Parameters: SEARCH-SIZE-X=2,SEARCH-SIZE-Y=6,SCAN-STEP-X=3.33,SCAN-STEP-Y=1.23 Number_of_Iterations: 1 Time_Per_Exposure: 2S Special_Requirements: ONBOARD ACQ FOR 2 Comments: Exposure_Number: 2 Target_Name: J03.13A-OFFSET-NEW Config: FOS/RD Opmode: ACQ/PEAK Aperture: 1.0 Sp_Element: MIRROR Wavelength: Optional_Parameters: SEARCH-SIZE-X=6,SEARCH-SIZE-Y=2,SCAN-STEP-X=0.61,SCAN-STEP-Y=0.61 Number_of_Iterations: 1 Time_Per_Exposure: 2S Special_Requirements: ONBOARD ACQ FOR 3 Comments: Exposure_Number: 3 Target_Name: J03.13A-OFFSET-NEW Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.5 Sp_Element: MIRROR Wavelength: Optional_Parameters: SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3,SCAN-STEP-X=0.29,SCAN-STEP-Y=0.29 Number_of_Iterations: 1 Time_Per_Exposure: 2S Special_Requirements: ONBOARD ACQ FOR 4 Comments: Exposure_Number: 4 Target_Name: J03.13A-OFFSET-NEW Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.3 Sp_Element: MIRROR Wavelength: Optional_Parameters: SEARCH-SIZE-X=4,SEARCH-SIZE-Y=4,SCAN-STEP-X=0.17,SCAN-STEP-Y=0.17 Number_of_Iterations: 1 Time_Per_Exposure: 10S Special_Requirements: ONBOARD ACQ FOR 5-10 Comments: Increase time_per_exposure from 10S to 12S, if possible! Exposure_Number: 5 Target_Name: WAVE Config: FOS/RD Opmode: ACCUM Aperture: 0.5 Sp_Element: G650L Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: DEF Special_Requirements: Comments: Exposure_Number: 6 Target_Name: J03.13A-OFFSET-NEW Config: FOS/RD Opmode: ACCUM Aperture: 0.5 Sp_Element: G650L Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 840S Special_Requirements: Comments: Exposure_Number: 7 Target_Name: J03.13B-NEW Config: FOS/RD Opmode: ACCUM Aperture: 0.5 Sp_Element: G650L Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 3700S Special_Requirements: EXPAND MAX DUR 110% MIN DUR 90% Comments: Exposure_Number: 8 Target_Name: J03.13B-NEW Config: FOS/RD Opmode: ACCUM Aperture: 0.5 Sp_Element: G650L Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 1200S Special_Requirements: EXPAND MAX DUR 150% MIN DUR 90% Comments: Exposure_Number: 9 Target_Name: J03.13C-NEW Config: FOS/RD Opmode: ACCUM Aperture: 0.5 Sp_Element: G650L Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 1000S Special_Requirements: Comments: Exposure_Number: 10 Target_Name: WAVE Config: FOS/RD Opmode: ACCUM Aperture: 0.5 Sp_Element: G650L Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: DEF Special_Requirements: Comments: Visit_Number: 05 Visit_Requirements: On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: H0449-1645 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: DITHER-TYPE=BOX,CR-SPLIT=NO,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 400S Special_Requirements: Comments: Visit_Number: 06 Visit_Requirements: On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: J03.13A-OFFSET-NEW Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: DITHER-TYPE=BOX,CR-SPLIT=NO,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 400S Special_Requirements: Comments: Exposure_Number: 2 Target_Name: J03.13A-OFFSET-NEW Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: DITHER-TYPE=BOX,CR-SPLIT=0.5,CR-TOLERANCE=0.0,ATD-GAIN=7 Number_of_Iterations: 1 Time_Per_Exposure: 360S Special_Requirements: Comments: Exposure_Number: 3 Target_Name: J03.13A-OFFSET-NEW Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7 Number_of_Iterations: 1 Time_Per_Exposure: 80S Special_Requirements: EXPAND MAX DUR 150% MIN DUR 60% Comments: Data_Distribution ! Defaults indicated; change if desired Medium: 8MM Blocking_Factor: 10 Ship_To: PI_Address Ship_Via: UPS Recipient_Email: ! Let us know what you think of this template and software! ! Please send a list of your likes and dislikes to your Program Coordinator__Diagnostic-Sum-Section__ Software-Version (Controller= 6.0) Preprocessor (Errors= 3 Fatal-Errors= 0 ) Validation (Errors= 0 Fatal-Errors= 0 ) Transformation (Errors= 0 Fatal-Errors= 0 ) CASM (Errors= 0 Fatal-Errors= 0 ) __User-Comments__ Dear Peggy, I re-submit now proposal 5958. I send you via separate E-mail some additional comments. Greetings, Jean