! Proposal 5888, submission 2 ! PI: Katherine Roth ! Received Wed Mar 8 23:32:35 EST 1995 ! From: kroth@stsci.edu ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5888,v 9.1 1995/11/22 13:49:49 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: Alice Berman ! Phone: 410 338-4462 , E-mail: aberman@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Proposal_Information ! Section 4 Title: Probing Tidal Debris in M 81 Proposal_Category: GO Scientific_Category: Interstellar Medium Cycle: 5 Investigators PI_name: Katherine Roth PI_Institution: University of Hawaii, IfA CoI_Name: David Bowen CoI_Institution: Space Telescope Science Institute Contact: ! Y or N (designate at most one contact) CoI_Name: J. C. Blades CoI_Institution: Space Telescope Science Institute Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose GHRS G270M spectral observations of the bright nucleus of M 81 in order to probe the extent of the tidal debris giving rise to the complex Mg II absorption toward the bright supernova SN 1993J. We have found no evidence of this material in Na I spectra obtained toward M 81 with the KPNO coud'e feed earlier this year. Our Mg II observations will provide a more sensitive search for this gas and will sample material within which Na I cannot exist. In addition, these observations provide a rare opportunity to probe the entire extent of the Milky Way halo in two sightlines separated by only 2.6' on the sky. Questions ! Free format text (please update) Observing_Description: We are proposing GHRS G270M spectral observations of Mg II absorption toward the bright nucleus of NGC 3031 (M 81). We have retrieved the IUE spectrum from the on-line version of the Kinney et al.\ 1993 Atlas of Ultraviolet Spectra of Star -Forming Galaxies, from which we measure a flux at Lambda = 2800 of 1.0times10^-14 erg cm^-2 s^-1 AA^-1. The G270M grating has a sensitivity at this wavelength of S_lambda=46.73*10^11 counts s^-1 diode^-1 (erg cm^-2 s^-1 AA^ -1)^-1 (Table 8-2, GHRS Handbook 5.0). This gives us a predicted detection rate of 0.0467 counts s^-1 diode^-1. Assuming an average dark count in the D2 detector of 0.011 counts s^-1 diode^-1, we require ~ 3 hours of integration for a S/N ratio diode^-1 of 20. We have distributed this time into CVZ orbits assuming 96 minutes of visibility, a 12 minute guide star acquisition (with no subsequent reacquisitions necessary), an 11 minute large science aperture target acquisition, a 3 minute spybal, with the rest of the time devoted to 20 minute FPSPLITs with their associated 4 minute overheads. In three orbits we will actually have 3.7 hours of integration allowing us to achieve a signal-to-noise ratio of 22. Real_Time_Justification: We are taking advantage of the high declination of our object to request observations in the continuous viewing zone. At this R.A. and Dec. (09 55.5, +69 04) there were 3 CVZ opportunities last year for a total of 110 hours. We are requesting only 3 orbits (4.8 hours) for this program, so we feel the extra efficiency afforded by the CVZ outweighs the slight scheduling risks associated with CVZ status. As described, we obtained high resolution Na I absorption data toward the nucleus of M 81 during 3 clear nights at the KPNO coud'e feed in early March of this year. We have no further plans for coordinated ground-based observations. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: NGC3031-NUC Alternate_Names: M81-NUC Description: EXT-MEDIUM, HI CLOUD, HIGH VELOCITY CLOUD, TIDAL TAIL, IGM; GALAXY, SPIRAL, SEYFERT, INTERACTING GALAXY, NUCLEUS ! Position: RA = 09H 55M 33.61S +/- 0.01S, DEC = +69D 03' 55.7" +/- 0.01" ! Most common specification format is ! RA=0H 0M 0.00S +/- 0S, ! DEC=0D 0' 0.0" +/- 0", Position: RA = 09h 55m 33.190s +/-0.001s, DEC = +69d 03' 55.11" +/-0.01", PLATE-ID=00M9 Equinox: J2000 RV_or_Z: V = -34 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: V = 6.9 SURF(R) = 13.5 ! B-V = 1.0 ! E(B-V) = 0.04 ! F(2800) = 1.0 E-14 ! SIZE = 1.2 ! ! Include at least V and B-V Comments: 26.9' X 14.1' full size; Coordinates measured from 3/95 PC image ! 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: CVZ ! Section 7.1 ! Uncomment or copy visit level special requirements needed ! Most of these requirements (including ORIENT) will limit scheduling ! PCS MODE [Fine | Gyro] ! GUIDing TOLerance ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN