! Proposal 6440, submission 1 ! PI: Duncan Forbes ! Received Fri Feb 16 12:32:05 EST 1996 ! From: forbes@ucolick.org ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6440,v 6.1 1997/06/04 02:16:12 pepsa Exp $ ! Hubble Space Telescope Cycle 6 (1996) Phase II Proposal Template ! $Id: 6440,v 6.1 1997/06/04 02:16:12 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: Lucas ! Phone: 410-338-4716 , E-mail: lucas@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Name of Phase I Proposal: archive-0147.forbes.prop ! Date generated: Fri Dec 22 16:28:31 EST 1995 ! Proposal_Information ! Section 4 Title: Resolving the Radio Hotspots in Nearby Starburst Galaxies Proposal_Category: GO Scientific_Category: GALAXIES & CLUSTERS Cycle: 6 Investigators PI_name: Duncan Forbes PI_Institution: Lick Observatory CoI_Name: Martin Ward CoI_Institution: Oxford University Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose to image the central regions of the starburst galaxy NGC 253 using narrow and broad--band filters. With such data a variety of topics relating to the starburst can be addressed. Our primary goal is to understand the nature of the numerous discrete radio sources seen in high--resolution radio mapping of these galaxies. Considerable controversy exists over whether these radio sources are HII regions or SNRs. A number of these in M82 have recently been resolved with sizes of 50 to 300 mas. We aim to resolve many of these radio sources in the PC chip and use narrow--band imaging in the emission lines of HAlpha, SII6717+6731 and SIII9532 as a diagnostic to discriminate between HII regions and SNRs. These data will also give important information on the physical properties of the SNRs. In addition, the WFC chips will trace the warm gas associated with the large--scale superwind present in all three galaxies on small physical scales. Finally, the broad--band imaging allows us to derive color--magnitude and color-color diagrams of the central regions, from which we can measure the integrated stellar properties, identify super--star clusters and estimate the dust extinction on small scales. Questions ! Free format text (please update) Observing_Description: We request WFPC2 imaging of the nearby starburst galaxy NGC 253 (it has high--resolution radio maps available) centered in the PC. NGC 253 has been imaged in F656N, F675W, F336W, F555W, F814W in cycle 4 by Trauger (\#5211). We will obtain this data from the archive and combine it with new images in F673N, F675W (needed to ensure the same roll angle as F673N), F953N, F850LP and F450W. Exposure times are based on examination of the F502N (30m) and F664N (15m) WFPC1 observations of NGC 253 by Ford using archive data. His F664N images show bright knots and nebulosity but have low counts. All three galaxies have a nuclear HAlpha flux similar to that of NGC 253, i.e. 4 * 10^-12 erg s^-1 cm^-2 with strong equivalent widths 10 -- 100 Angstrom (e.g. Waller et al. 1988, AJ, 95, 1057). Trauger obtained 40m exposure of NGC 253 in the F656N filter, but this data is not available in the archive until late Sept. 1995. We propose to obtain; F673N (40m), F953N (42m), F675W (11m), F850LP (11m), F450W (10m). , All images will be CR split. Calibration of the broad--band filters will be carried out using ground-- based magnitudes from the literature taken in standard filters (for which transformations to WFPC2 filters are available). Narrow--band filters will be calibrated using the known relative spectral response of the narrow--band (line) and broad--band (continuum) filters. NOTE: F631N has been substituted for F673N. F622W has been substituted for F675W. Both changes were requested by the PI in order to avoid duplication problems. - RAL - 1 April, 1997 NOTE: Further substitutions were made by PI with CS's approval. The 2x1200s exposures at ATD-GAIN=7 in F631N became 2x1200s exposures at ATD-GAIN=7 in F502N. The 2x300s exposures at ATD-GAIN=15 in F622W became 2x300s exposures at ATD-GAIN=15 in F631N. The 1x300s and 1x160s at ATD-GAIN=15 in F300W became 1x300s and 1x160s at ATD-GAIN=15 in F631N. The order of the exposures in F850LP and the first two exposures in F631N were changed to minimize overhead time lost to filter wheel changes and to group all the F631N exposures together. - Ray Lucas - 3 June, 1997 Real_Time_Justification: None. None. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: NGC253-NUC Alternate_Names: Description: GALAXY,STARBURST Position: RA=00H47M33.1S+/-1",DEC=-25D17'18"+/-1" Equinox: 2000 RV_or_Z: V=+249 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: B-V=1.26+/-0.1,SURF(V)=18.9+/-0.2 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: ORIENT 273.2732D TO 313.2732D ! 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 ! DROP TO GYRO IF NECESSARY [NO REACQuisition] ! ORIENTation TO ! ORIENTation TO FROM ! ORIENTation TO FROM NOMINAL ! SAME ORIENTation AS ! CVZ ! PARallel ! SCHEDulability ! AFTER [BY [TO ]] ! AFTER ! BEFORE ! BETWEEN AND ! GROUP WITHIN