!From KINNEY@avion.stsci.edu Tue Mar 5 10:08:38 1996 !Subject: This is proposal 6005B (doing A+B, A+B, A+B+C) !To: sleiman@stsci.edu !X-Vms-To: SLEIMAN !Mime-Version: 1.0 !Content-Type: TEXT/PLAIN; CHARSET=US-ASCII !Content-Transfer-Encoding: 7BIT !This version was revised by Rachel Webster an Anne Kinney on Feb. 15th !This is the version that observers in the pattern ! 1) A B 2) A B 3) A B C ! From: webster@venus.ph.unimelb.edu.au Proposal_Information ! Section 4 Title: Microarcsecond Imaging of a Gravitationally Lensed QSO: 2237+0305 Proposal_Category: GO Scientific_Category: AGN Cycle: 5 Investigators PI_name: Dr. Rachel Webster PI_Institution: University of Melbourne CoI_Name: Dr. Paul Francis CoI_Institution: University of Melbourne Contact: ! Y or N (designate at most one contact) CoI_Name: Dr. Anne Kinney CoI_Institution: Space Telescope Science Insititute Contact: ! Y or N (designate at most one contact) CoI_Name: Prof. Jeremy Mould CoI_Institution: Mount Stromlo and Siding Springs Observatory Contact: ! Y or N (designate at most one contact) CoI_Name: Prof. Robert Antonucci CoI_Institution: University of California, Santa Barbra Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) The central regions of the gravitationally lensed quasar, 2237+0305, can be resolved on microarcsecond scales, if viewed during a microlensing event. We will monitor the QSO from the ground at regular intervals to ascertain the onset of a microlensing event. FOS spectra will then be taken and compared with the spectra taken after to the event. As the microlensing event occurs, we will measure the variations in lines with different ionisations, and also wavelength- dependent changes in continuum. Thus we will use microlensing to probe structures of QSOs on microarcsecond scales -- the size of the putative accretion disk and a factor of ten smaller than ever observed before. Questions ! Free format text (please update) Observing_Description: We will use FOS/RD with spectral elements G270H, G400H and G780H. We will obtain SNR = 20 for each of these spectra (note that an allowance has been made for the depression in flux in the Ly Alpha forest). We will use the A-3 pair of apertures (0.25- PAIR); the small aperture size will minimize the contribution of the lensing galaxy. We will monitor 2237+0305 from the ground, using telescopes at Mt Stromlo and Siding Spring observatories. When a microlensing event starts, and is confirmed by high resolution ground-based imaging, we will request the target of opportunity observations. From previous monitoring, the timescale of the microlensing event is likely to be 30---50 days, and the amplitude of variation ~ 0.2 magnitude (eg. Pen et al. in Proc 31st Liege Colloquium, 1993). Thus we expect, that regular ground-based monitoring plus the 2-5 day delay for Target of Opportunity observations on HST, would allow us to take the first FOS spectrum about halfway through the microlensing event. A second spectrum would be taken six days later. During the target of opportunity we will observe the microlensed image, and as a reference the brightest remaining image. The orbital visibility is 52 minutes. A four stage acquisition is required for the small aperture for the initial image on each visit, as well a 12 minute peakup on the other image. About one month later, we will observe the three brightest images of 2237+0305. Real_Time_Justification: Two Target of Opportunity observations are then requested: n and n+6 days, where n denotes the day of the first Target of Opportunity observation. A final set of observations will be taken about one month after the TOO observations to serve as a baseline for calibration. Ground-based support is available from MSSSO for this project. 2237+0305 will be monitored from the ground on a regular basis, using telescopes at Siding Springs and at Mount Stromlo. These observations will be R and I-band imaging (to allow us to work in bright time), and a variety of telescopes will be used, depending on availability. As the typical observed period of a microlensing event is ~ 1 month, observations will be carried out every 2---3 days, to allow for possible loss of data from weather. Photometric conditions are not required for the monitoring, since we can perform differential photometry. Although we will not always be able to resolve the individual images, in conditions of better than 2sec point we will be able to determine changes of about 0.1 magnitudes in one of the three brighter images by model fitting, given the accurately known positions of the four components. Once a microlensing event commences, we will confirm the event before activating our Target of Opportunity option. The frequency of microlensing in 2237+0305 is not known accurately, but significant microlensing of one or more images has been seen in every monitoring campaign. For example, Pen et al. monitored 2231+0305 for a period of 100 days in 1992. During their monitoring, image A brightened by one magnitude then dropped by two, on a timescale of 30 days. Fixed_Targets Target_Number: 1 Target_Name: 2237+0305-A Description: GALAXY, QSO, Gravitational Lens Position: RA-OFF=0.01586D +/- 0.000028D, DEC-OFF=27.9" +/- 0.2", FROM 4 Equinox: J2000 RV_or_Z: Z=1.695 Flux: V=17.7 +/- 0.3, B-V=0.6 Target_Number: 2 Target_Name: 2237+0305-B Description: GALAXY, QSO, Gravitational Lens Position: RA-OFF=0.01567D +/- 0.000005D, DEC-OFF=29.59" +/- 0.005", FROM 4 ! PLATE-ID=0000 THIS ID must be added Equinox: J2000 RV_or_Z: Z=1.695 Flux: V=17.9 +/- 0.3, B-V=0.6 Target_Number: 3 Target_Name: 2237+0305-C Description: GALAXY, QSO, Gravitational Lens Position: RA-OFF=0.01603D +/- 0.000005D, DEC-OFF=29.10" +/- 0.005", FROM 4 ! PLATE-ID=0000 THIS ID MUST Be ADDED Equinox: J2000 RV_or_Z: Z=1.695 Flux: V=18.0 +/- 0.3, B-V=0.8 Target_Number: 4 Target_Name: 2237+0305-OFFSET Description: STAR, K V-IV ! 70"E OF LENSED OBJECT, YEE, AJ, 95, 1331 Position: RA=22H 40M 26.38S +/- 0.03S, DEC=03D 21' 02.16" +/- 0.1" ! PLATE-ID=015P this ID must be added Equinox: J2000 Flux: V=17.5 +/- 0.3, B-V=0.77 Comments: OFFSET STAR FOR FIRST BINARY ACQ FROM YEE, AJ, 95, 1331 Visits ! Section 6 Visit_Number: 1 Visit_Requirements: ON HOLD ! Section 7.1 On_Hold_Comments: Target of Opportunity Visit_Comments: It will be assumed that the brightest image and the variable image are A and B; this will be determined by ground-based observations. Exposure_Number: 1 Target_Name: 2237+0305-OFFSET Config: FOS/RD Opmode: ACQ/PEAK Aperture: 4.3 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=1,SEARCH-SIZE-Y=3,SCAN-STEP-Y=1.23 Time_Per_Exposure: 15s Special_Requirements: ONBOARD ACQ FOR 2 Exposure_Number: 2 Target_Name: 2237+0305-OFFSET Config: FOS/RD Opmode: ACQ/PEAK Aperture: 1.0 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=6,SEARCH-SIZE-Y=2,SCAN-STEP-X=0.61,SCAN-STEP-Y=0.61 Time_Per_Exposure: 15s Special_Requirements: ONBOARD ACQ FOR 3 Comments: Critical peak-up in the requried aperture. Exposure_Number: 3 Target_Name: 2237+0305-OFFSET Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.5 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3,SCAN-STEP-X=0.29,SCAN-STEP-Y=0.29 Time_Per_Exposure: 15S Special_Requirements: ONBOARD ACQ FOR 4 Exposure_Number: 4 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.3 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=4,SEARCH-SIZE-Y=4,SCAN-STEP-X=0.17,SCAN-STEP-Y=0.17 Time_Per_Exposure: 75S Special_Requirements: ONBOARD ACQ FOR 5 Exposure_Number: 5 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.3 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=4,SEARCH-SIZE-Y=4,SCAN-STEP-X=0.052,SCAN-STEP-Y=0.052 Time_Per_Exposure: 75S Special_Requirements: ONBOARD ACQ FOR 6 SAVE OFFSET 2237+0305-A Exposure_Number: 6 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G270H Time_Per_Exposure: 1500S Exposure_Number: 7 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G400H Time_Per_Exposure: 1200S Exposure_Number: 8 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G780H Time_Per_Exposure: 1700S Exposure_Number: 9 Target_Name: 2237+0305-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G270H Time_Per_Exposure: 2000S Exposure_Number: 10 Target_Name: 2237+0305-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G400H Time_Per_Exposure: 1500S Exposure_Number: 11 Target_Name: 2237+0305-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G780H Time_Per_Exposure: 2300S !Visits ! Section 6 Visit_Number: 2 Visit_Requirements: AFTER 1 BY 5D TO 7D ! On_Hold_Comments: TOO after visit 1 Visit_Comments: It will be assumed that the brightest image and the variable image are A and B; this will be determined by ground-based observations. Exposure_Number: 21 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.3 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=4,SEARCH-SIZE-Y=4,SCAN-STEP-X=0.052,SCAN-STEP-Y=0.052 Time_Per_Exposure: 75S Special_Requirements: ONBOARD ACQ FOR 22 USE OFFSET 2237+0305-A Comments: The offsets obtained from the TA of the first visit must be re-used here. Exposure_Number: 22 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G270H Time_Per_Exposure: 1500S Exposure_Number: 23 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G400H Time_Per_Exposure: 1200S Exposure_Number: 24 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G780H Time_Per_Exposure: 1700S Exposure_Number: 25 Target_Name: 2237+0305-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G270H Time_Per_Exposure: 2000S Exposure_Number: 26 Target_Name: 2237+0305-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G400H Time_Per_Exposure: 1500S Exposure_Number: 27 Target_Name: 2237+0305-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G780H Time_Per_Exposure: 2300S !Visits Visit_Number: 3 Visit_Requirements: AFTER 2 BY 40D TO 50D ! On_Hold_Comments: TOO after visit 2 Visit_Comments: It will be assumed that the brightest image and the variable image are A and B; this will be determined by ground-based observations. Exposure_Number: 31 Target_Name: 2237+0305-OFFSET Config: FOS/RD Opmode: ACQ/PEAK Aperture: 4.3 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=1,SEARCH-SIZE-Y=3,SCAN-STEP-Y=1.23 Time_Per_Exposure: 15s Special_Requirements: ONBOARD ACQ FOR 32 Exposure_Number: 32 Target_Name: 2237+0305-OFFSET Config: FOS/RD Opmode: ACQ/PEAK Aperture: 1.0 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=6,SEARCH-SIZE-Y=2,SCAN-STEP-X=0.61,SCAN-STEP-Y=0.61 Time_Per_Exposure: 15s Special_Requirements: ONBOARD ACQ FOR 33 Comments: Critical peak-up in the requried aperture. Exposure_Number: 33 Target_Name: 2237+0305-OFFSET Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.5 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3,SCAN-STEP-X=0.29,SCAN-STEP-Y=0.29 Time_Per_Exposure: 15S Special_Requirements: ONBOARD ACQ FOR 34 Exposure_Number: 34 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.3 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=4,SEARCH-SIZE-Y=4,SCAN-STEP-X=0.17,SCAN-STEP-Y=0.17 Time_Per_Exposure: 75S Special_Requirements: ONBOARD ACQ FOR 35 Exposure_Number: 35 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACQ/PEAK Aperture: 0.3 Sp_Element: MIRROR Optional_Parameters:SEARCH-SIZE-X=4,SEARCH-SIZE-Y=4,SCAN-STEP-X=0.052,SCAN-STEP-Y=0.052 Time_Per_Exposure: 75S Special_Requirements: ONBOARD ACQ FOR 36 Exposure_Number: 36 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G270H Time_Per_Exposure: 1500S Exposure_Number: 37 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G400H Time_Per_Exposure: 1200S Exposure_Number: 38 Target_Name: 2237+0305-A Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G780H Time_Per_Exposure: 1700S Exposure_Number: 39 Target_Name: 2237+0305-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G270H Time_Per_Exposure: 2000S Exposure_Number: 40 Target_Name: 2237+0305-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G400H Time_Per_Exposure: 1500S Exposure_Number: 41 Target_Name: 2237+0305-B Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G780H Time_Per_Exposure: 2300S Exposure_Number: 42 Target_Name: 2237+0305-C Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G270H Time_Per_Exposure: 2000S Exposure_Number: 43 Target_Name: 2237+0305-C Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G400H Time_Per_Exposure: 1500S Exposure_Number: 44 Target_Name: 2237+0305-C Config: FOS/RD Opmode: ACCUM Aperture: 0.25-PAIR Sp_Element: G780H Time_Per_Exposure: 2300S Data_Distribution ! 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