Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 1012c Report Date: 09-May-96:16:01 Version: ********** Check-in Date: ********** 1.Proposal Title: HIGH-RESOLUTION SURFACE PHOTOMETRY OF NGC 4314 : CYCLE 0 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID GALAXIES & CLUSTERS GTO/AST Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone William H. Jefferys TEXAS, UNIVERSITY OF USA 512-471-1455 PROFESSOR ------------------------------------------------------------------------------------ 7. Abstract We propose to obtain ST WF/PC surface photometry of NGC 4314. NGC 4314 exhibits anomalous nuclear activity indicative of on-going star formation. Multicolor surface photometry with 0.1 to 0.4 arcsec resolution will afford an opportunity to explore the global interrelationships between gas clouds, dust, star formation, and stellar populations with detail never before obtained. The expected maximum resolution for for NGC 4314 is 10 parsecs. While most of the data will be secured after the refurb mission with WFPC II, these early I-band exposures will allow studies of structures. ------------------------------------------------------------------------------------ 8. Scientific Key Words: GALAXIES, BARRED GALAXIES, PECULIAR GALAXIES, NUCLEAR RINGS ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 5.21 par: 0 10. Num targs pri: 2 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: WF/PC ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 1012c PI: William H. Jefferys Proposal Title: HIGH-RESOLUTION SURFACE PHOTOMETRY OF NGC 4314 : CYCLE 0 ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ William H. Jefferys TEXAS, UNIVERSITY OF USA Peter J. Shelus TEXAS, UNIVERSITY OF USA Paul D. Hemenway TEXAS, UNIVERSITY OF USA Laurence W. Fredrick VIRGINIA, UNIVERSITY OF USA William F. Van Altena YALE UNIVERSITY USA George F. Benedict TEXAS, UNIVERSITY OF USA Raynor L. Duncombe TEXAS, UNIVERSITY OF USA Otto G. Franz LOWELL OBSERVATORY USA ------------------------------------------------------------------------------------ 3. Description of proposed observations. The bandpasses are chosen for comparison with ground-based observations and to obtain a long wavelength baseline to allow an effective probe for young stars and into dusty regions. The observing times are estimated from much lower-resolution ground-based observations (see References) and from the WF/PC User's Guide. These observations will be made with the WF/PC in WF configuration. Two exposures in each bandpass will be summed and compared to allow cosmic ray detection and removal. Sky brightness data will be obtained from the outer sections of the 2.57 x 2.57 arcmin field of view, since the galaxy has B(SURF) > 25 per square arcsec at these distances from the nucleus. We expect to observe NGC 4314 in June 1991, I-band (F785LP) only. (Cycle 1). ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. Multicolor surface photometry with 0.10 to 0.4 arcsec resolution will afford an opportunity to explore the global interelationships between gas clouds, dust, star formation, and stellar populations with detail rarely, if ever, obtained with ground-based instrumentation. The best resolution that can be routinely obtained from the ground is about 0.5 arcsec. The best obtained for this galaxy is about 2 arcseconds. Assuming Ho = 100, the expected resolution for NGC 4314 is 8 parsecs resolution, or 16 parsec resolution, if post-observation pixel summation is required. It is expected that simple resolution-enhancement techniques such as unsharp masking will provide much information on the distribution of stars and dust within the nuclear spiral of NGC 4314. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. Dark-Time required due to low surface brightness of objects. Dark-Time required due to terminator-induced spacecraft jitter. Observations should be scheduled at least ten minutes after terminator crossing, to minimize loss of lock potential. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. Initial data reduction and preliminary analysis will be carried out at the STScI, using SDAS. We assume that flat-field, bias, dark frame, and Kelsall Dot exposures will be provided by the calibration database. Final analysis will be done at the University of Texas. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). Sun SparcStation 1+ running IRAF ------------------------------------------------------------------------------------ 12. Proposers may require access to STScI resources for preparation of final color- coded and grey-scale maps for publication. Page 3 ------------------------------------------------------------------------------------ 13. Using the PC, we propose to obtain I band images of NGC 4314 (active nuclear ring). Resolutions will range from 0.09 to 0.4 arcsec. These basic data will provide constraints for theories of gas accretion and star formation in galactic nuclei. ------------------------------------------------------------------------------------ 11. Address Information Name: WILLIAM H. JEFFERYS Category: PI Institution: UNIVERSITY OF TEXAS Address: ASTRONOMY DEPARTMENT City: AUSTIN State: TX Zip Code: 78712 Country: USA Telephone: 512-471-1455 Telex (or e-mail): ------------------------------------------------------------------------------------ Name: GEORGE F. BENEDICT Category: CON Institution: UNIVERSITY OF TEXAS Address: ASTRONOMY DEPARTMENT City: AUSTIN State: TX Zip Code: 78712 Country: USA Telephone: 512-471-3448 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 1012c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4314 BARRED GALAXY WITH RA=12H 20M 1.8S +/- 0.5S, 1950.0 V=+879 EXT 1 SURF(V)=18 +/- 1.5 NUCLEAR RING DEC=+30D 10' 23.1" +/- 0.4" 2 SURF(U)=20.3 +/- 1.5 3 SURF(I)=17.0 +/- 1.0 Comments: RANGE IN FLUX DATA ACTUALLY +2 AND -1 FOR NGC4314 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 1012c [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4314 PC IMAGE ALL F785LP 8922 PRE-FLASH=YES 2 200S 15 2 1 CYCLE 0 / 1 DARKTIME / 1 NON-INT / 1 GUID TOL 0.007" Comments: AVOID TERMINATOR CROSSING FINE- LOCK REQUIRED AT 24-JUN-91 +/- 30D WAIT UNTIL CONTAMINATION PROBLEMS ARE RESOLVED BEFORE EXECUTING THIS ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 1012c [ 6] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations PC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters PRE-FLASH=YES ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/AST ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 5.21 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category GALAXIES & CLUSTERS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 0 / 1; DARKTIME / 1; NON-INT / 1; GUID TOL 0.007" ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F785LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC4314 ------------------------------------------------------------------------------------------------------------------------------------