! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6888 ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6888,v 4.1 1996/03/13 13:56:47 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: Rob Landis ! Phone: 410-338-4560 , E-mail: landis@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: archive-0001.smith.prop ! Date generated: Fri Feb 23 13:03:39 EST 1996 ! Proposal_Information ! Section 4 Title: Scattered Emission from the Active Nucleus Buried in NGC 4258 Proposal_Category: GO Scientific_Category: GALAXIES & CLUSTERS Cycle: 6 Investigators PI_name: Gary D. Schmidt PI_Institution: Steward Observatory, University of Arizona CoI_Name: Paul S. Smith CoI_Institution: Steward Observatory, University of Arizona Contact: ! Y or N (designate at most one contact) CoI_Name: H.S. Stockman CoI_Institution: Space Telescope Science Institute Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) The recent detection of H_2O masers in an edge-on disk orbiting a massive black hole in the nearby spiral galaxy NGC 4258 (Miyoshi et al. 1995) represents a fundamental step forward in our understanding of the structure of active galactic nuclei. Ground-based imaging- and spectro- polarimetry obtained by us during the past year have extended this result with the discovery of a featureless nuclear continuum and 1000 km s^-1-wide emission lines, polarized presumably by scattering in a toroidal geometry. The polarization position angle is identical to the elongation of the maser disk on the sky, establishing a direct link between the geometry of an obscuring torus in an active galaxy and material orbiting a compact object of high mass. We propose to obtain small-aperture UV spectroscopy and spectropolarimetry of the nucleus of NGC 4258 to isolate this scattered AGN spectrum from the surrounding starlight. This will be used to measure the nonthermal spectral shape and luminosity, and search for scattered UV emission lines. In addition, ultraviolet images obtained with WFPC2 will be compared with existing Cycle 4 optical continuum and emission- line images to search for the ionizing cones which are expected to be produced by radiation escaping along the axis of the torus. Unfortunately, high-resolution imaging polarimetry must await the installation of the Advanced Camera in 1999. Questions ! Free format text (please update) Observing_Description: Because of the likelihood that the scattering region in NGC 4258 may be resolved, we have chosen the "s0.5\ aperture of FOS despite the increase in admitted starlight over the "s0.3\ option. The only UV spectrum available (Kinney et al. 1993) measures a total flux of 1.5times10^-14 ergs cm^-2 s^-1 Angstrom^-1 at 2500 Angstrom\ in a 10"\by20"\ aperture, dominated by starlight. Our optical CCD images suggest that 3 --5\ would be detected in a "s0.5\ aperture. From extrapolation of our optical spectropolarimetry on p. 3, the polarized component would be expected to account for ~1/4 of this total -- the remainder being starlight. If we require a polarimetric uncertainty Sigma_P~1\ polarized emission lines above such a continuum, the FOS/polarimeter sensitivity figures in the Instrument Handbook indicate a total observing time with the G270H,POL0-B grating of ~10 hrs. The spectropolarimetry using FOS/BL and G270H,POL0-B requires 16 orbits. Two of these orbits will have to be devoted to target acquisition (4-stage ACQ/PEAKs) since a maximum of 8 orbits can scheduled without interference from the South Atlantic Anomaly (SAA). In order to obtain similar polarimetric accuracy using FOS/BL and G190H, nearly 30 hrs would be needed. Therefore, only spectroscopy using this grating, 0arcs5 aperture, and FOS/RD will be obtained. However, this observation will yield the first UV spectrum that isolates the nucleus and allows for the measurement of important emission lines expected from the AGN in this spectral region (such as HeII Lambda1640 and CIII Lambda1909). A separate target acquisition (same as above) will be necessary for the G190H observation because of the constraints imposed by the SAA. The RED detector offers a factor of 2--3 increased sensitivity over FOS/BL for most of the spectrum sampled by the G190H grating, and we estimate that 3 orbits in this configuration will yield a SNR of sim20 diode^-1. Our WFPC2 observation will require 1 orbit and consist of two 1200 s Planetary Camera exposures using the F300W filter. >From our estimate that ~4\ flux will be admitted by the 0arcs5 aperture of FOS, there will be a flux of roughly 2.4 * 10^-15 ergs cm^-2 s^-1 AA^-1 within the inner arcsec^2. This translates into sim650 electrons pixel^-1 in a 1200 s exposure assuming that the flux is uniformly distributed within this region. The UV background is negligible (< 1 e^- pix^-1), read noise = 5.2 e^- pix^-1, and dark count = sim6 e^- pix^-1 in a 1200 s exposure. Real_Time_Justification: None. Ground-based polarimetry of NGC 4258 spanning a period of 6 months have shown no indication of variability. Thus, coordinated observations are not expected to be necessary. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: NGC4258 Alternate_Names: M106 Description: GALAXY,Seyfert Position: ! Most common specification format is RA=12H 18M 57.51S +/- 1.0", ! RA=0H 0M 0.00S +/- 0S, DEC=47D 18' 14.50" +/- 1.0", ! DEC=0D 0' 0.0" +/- 0", PLATE-ID=024D ! PLATE-ID=0000 Equinox: 2000 RV_or_Z: V=+472 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: F(5500) =1.4 +/- 0.1 E-14, ! Include at least V and B-V. F(4400) =1.4 +/- 0.1 E-14 Comments: Nucleus of a giant SABbc galaxy. ! 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 ! Uncomment or copy visit level special requirements needed ! Most of these requirements (including ORIENT) will limit scheduling On_Hold_Comments: Visit_Comments: Exposure_Number: 10 ! Section 6.5 Target_Name: NGC4258 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F300W Wavelength: 2943 Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 1800S Special_Requirements: NO SPLIT ! Section 7.2 Exposure_Number: 11 ! Section 6.5 Target_Name: NGC4258 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F300W Wavelength: 2943 Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 600S Special_Requirements: NO SPLIT ! Section 7.2 Visit_Number: 2 Visit_Requirements: Exposure_Number: 20 Target_Name: NGC4258 Config: FOS/BL Opmode: ACQ/PEAK Aperture: 4.3 Sp_Element: MIRROR Wavelength: Optional_Parameters: SCAN-STEP-Y=1.23, SEARCH-SIZE-X=1, SEARCH-SIZE-Y=3 Number_of_Iterations: 1 Time_Per_Exposure: 5.0S Special_Requirements: ONBOARD ACQuisition FOR 21 Exposure_Number: 21 Target_Name: NGC4258 Config: FOS/BL Opmode: ACQ/PEAK Aperture: 1.0 Sp_Element: MIRROR Wavelength: Optional_Parameters: SCAN-STEP-X=0.61, SCAN-STEP-Y=0.61, SEARCH-SIZE-X=6, SEARCH-SIZE-Y=2 Number_of_Iterations: 1 Time_Per_Exposure: 5.5S Special_Requirements: ONBOARD ACQuisition FOR 22 Exposure_Number: 22 Target_Name: NGC4258 Config: FOS/BL Opmode: ACQ/PEAK Aperture: 0.5 Sp_Element: MIRROR Wavelength: Optional_Parameters: SCAN-STEP-X=0.29, SCAN-STEP-Y=0.29, SEARCH-SIZE-X=3, SEARCH-SIZE-Y=3 Number_of_Iterations: 1 Time_Per_Exposure: 6.0S Special_Requirements: ONBOARD ACQuisition FOR 23 Exposure_Number: 23 Target_Name: NGC4258 Config: FOS/BL Opmode: ACQ/PEAK Aperture: 0.3 Sp_Element: MIRROR Wavelength: Optional_Parameters: SCAN-STEP-X=0.11, SCAN-STEP-Y=0.11, SEARCH-SIZE-X=4, SEARCH-SIZE-Y=4 Number_of_Iterations: 1 Time_Per_Exposure: 6.3S Special_Requirements: ONBOARD ACQuisition FOR 30-90 ! Exposure_Number: 24 ! Target_Name: NGC4258 ! Config: FOS/BL ! Opmode: ACQ ! Aperture: 4.3 ! Sp_Element: MIRROR !Number_of_Iterations: 1 ! Time_Per_Exposure: 5.0S !Special_Requirements: ! Comments: CONFIRMING ACQ IMAGE Exposure_Number: 30 Target_Name: NGC4258 Config: FOS/BL Opmode: ACCUM Aperture: 0.5 Sp_Element: G270H Wavelength: 2750 Optional_Parameters: POLSCAN=4B Number_of_Iterations: 1 Time_Per_Exposure: 2300S Special_Requirements: NO SPLIT Comments: POLSCAN AT POL0-B, POL22.5-B, POL45-B, AND POL67.5-B Exposure_Number: 40 Target_Name: NGC4258 Config: FOS/BL Opmode: ACCUM Aperture: 0.5 Sp_Element: G270H,POL90-B Wavelength: 2750 Optional_Parameters: POLSCAN=4B Number_of_Iterations: 1 Time_Per_Exposure: 2300S Special_Requirements: NO SPLIT Comments: POLSCAN AT POL90-B, POL112.5-B, POL135-B, AND POL157.5-B Exposure_Number: 50 Target_Name: NGC4258 Config: FOS/BL Opmode: ACCUM Aperture: 0.5 Sp_Element: G270H,POL180-B Wavelength: 2750 Optional_Parameters: POLSCAN=4B Number_of_Iterations: 1 Time_Per_Exposure: 2300S Special_Requirements: NO SPLIT Comments: POLSCAN AT POL180-B, POL202.5-B, POL225-B, AND POL247.5-B Exposure_Number: 60 Target_Name: NGC4258 Config: FOS/BL Opmode: ACCUM Aperture: 0.5 Sp_Element: G270H,POL270-B Wavelength: 2750 Optional_Parameters: POLSCAN=4B Number_of_Iterations: 1 Time_Per_Exposure: 2300S Special_Requirements: NO SPLIT Comments: POLSCAN AT POL270-B, POL292.5-B, POL315-B, AND POL337.5-B Exposure_Number: 70 Target_Name: NGC4258 Config: FOS/BL Opmode: ACCUM Aperture: 0.5 Sp_Element: G270H Wavelength: 2750 Optional_Parameters: POLSCAN=4B Number_of_Iterations: 1 Time_Per_Exposure: 2300S Special_Requirements: NO SPLIT Comments: POLSCAN AT POL0-B, POL22.5-B, POL45-B, AND POL67.5-B Exposure_Number: 80 Target_Name: NGC4258 Config: FOS/BL Opmode: ACCUM Aperture: 0.5 Sp_Element: G270H,POL90-B Wavelength: 2750 Optional_Parameters: POLSCAN=4B Number_of_Iterations: 1 Time_Per_Exposure: 2300S Special_Requirements: NO SPLIT Comments: POLSCAN AT POL90-B, POL112.5-B, POL135-B, AND POL157.5-B Exposure_Number: 90 Target_Name: NGC4258 Config: FOS/BL Opmode: ACCUM Aperture: 0.5 Sp_Element: G270H,POL180-B Wavelength: 2750 Optional_Parameters: POLSCAN=8B Number_of_Iterations: 1 Time_Per_Exposure: 2000S Special_Requirements: NO SPLIT Comments: POLSCAN AT POL180-B, POL202.5-B, POL225-B, POL247.5-B, POL270-B, POL292.5-B, POL315-B, AND POL337.5-B ! Uncomment or copy exposure level special requirements needed ! 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: ! ! Tucson ! 85721 ! ! 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! ! Please send a list of your likes and dislikes to your Program Coordinator