Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 1245c Report Date: 09-May-96:16:22 Version: ********** Check-in Date: ********** 1.Proposal Title: IMAGES OF FAINT BLUE RADIO GALAXIES FROM THE 5C12 SURVEY ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID QUASARS & AGN GTO/FOC Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Alec Boksenberg ROYAL GREENWICH OBSERVATORY UNITED KIN 0223-374000 PROFESSOR ------------------------------------------------------------------------------------ 7. Abstract We propose direct imaging with the ST/FOC F/96 mode, of three blue radio galaxies from the 5C12 sample. These galaxies are photometrically and morphology distinct from the giant ellipticals which host most 5C radio surces, and they are tentatively identified low red-shift, late-type spiral galaxies hosting radio sources of order 1,000 x more radio luminous than those in normal spiral galaxies. The aim of these observations is detection of spiral structure in the galaxies and the form of their apparent interaction with neighbours. At the redshift ~0.2 estimated from their apparent magnitude, they are viewed at a scale of ~5 kpc arcsec-1 and direct imaging from the ground cannot reveal the presence of spiral arms. ------------------------------------------------------------------------------------ 8. Scientific Key Words: ACTIVE GALAXIES, SPIRAL GALAXIES, GALAXY EVOLUTION ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 1.20 par: 0 10. Num targs pri: 3 par: 0 ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 1245c PI: Alec Boksenberg Proposal Title: IMAGES OF FAINT BLUE RADIO GALAXIES FROM THE 5C12 SURVEY ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ G. Grueff BOLOGNA, UNIVERSITY OF ITALY X M. Vigotti BOLOGNA, UNIVERSITY OF ITALY X C. R. Benn BRAIN AND PERCEPTION LABORATORY UNITED KING X Jasper V. Wall ROYAL GREENWICH OBSERVATORY UNITED KING X Alec Boksenberg ROYAL GREENWICH OBSERVATORY UNITED KING X ------------------------------------------------------------------------------------ 3. Description of proposed observations. We propose to observe three of the 5C12 S galaxies through U filter (F 342W) in f/96 mode, using a 512 x 512 format. Dark sky is required, in order to have reasonable signal to noise on low surface brightness structure. The objects we wish to observe are: 5C12 R.A Dec. v b-v v-r 18 12 51 33.44 35 53 28.2 20.9 0.21 0.43 4 12 48 21.85 34 56 47.2 20.9 0.54 0.73 51 12 53 56.45 36 00 02.7 19.8 0.61 0.72 Absolute and relative photometric and astrometric calibration accuracies of 10% and 0.05 arcsec are adequate. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. The aim of the observation is detection of spiral structure in the S images. At the redshift ~ 0.2-1 estimated from their apparent magnitude, they are viewed at a scale of ~ 5 kpc arcsec and direct imaging from the ground cannot reveal the presence of spiral arms. Photography from space is required and we propose to image three S-galaxies with Space Telescope. In order to maximise the visibility of the arms of the galaxy over the background, imaging will be carried out through U filter. At these short wavelengths, the faint-object camera is preferable to the wide-field camera. Assuming a central surface brightness for spiral galaxies of m = 21.5 mag arcsec -2 and an e- folding scale of 5 kpc, then a 2000s exposure through a U(u) filter will give a signal to noise of 6 for the following radius - element size combination: radius on galaxy image image convolved to element size kpc kpc arcsec 0 0.2 0.04 5 0.6 0.1 10 0.6 0.3 If spiral arms are present, they should thus be clearly visible in the inner parts of the galaxies. The 11-arcsec field should also allow us to observe any details of close interaction between galaxies, blurred by seeing for ground observations. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. None ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. Analysis will be carried out at the RGO STARLINK node if appropriate software is available. Failing this, we propose to use data analysis facilities at the European Space Telescope Centre, Munich. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). All resources to support the proposed observations to be supplied by RGO and Istituto di Radioastronomia, Bologna. ------------------------------------------------------------------------------------ 13. The 5C12 deep radio/optical survey currently provides the most extensive and accurate data base for the study of cosmology and astrophysics of distant AGN's. This proposal is to elucidate the nature of blue active galaxies among the survey identifications which appear to constitute a significant new population whose astrophysical and cosmological properties are not understood. Page 3 ------------------------------------------------------------------------------------ 11. Address Information Name: ALEC BOKSENBERG Category: PI Institution: ROYAL GREENWICH OBSERVATORY Address: MADINGLEY ROAD CB3 0EZ City: CAMBRIDGE State: Zip Code: Country: UNITED KINGDOM Telephone: (44) 223 374000 Telex (or e-mail): 317235 ------------------------------------------------------------------------------------ Name: JASPER V. WALL Category: CON Institution: ROYAL GREENWICH OBSERVATORY Address: MADINGLEY ROAD CB3 0EZ City: CAMBRIDGE State: Zip Code: Country: UNITED KINGDOM Telephone: (44)223 374000 Telex (or e-mail): 817235 ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 1245c [ 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 5C12.4 RA = 12H 48M 21.862S +/- 1950 EXT 1 V = 20.9 +/- 0.1 0.08S, 2 B = 21.4 +/- 0.1 DEC = +34D 56' 45.08" +/- 1.0" Comments: GASP POSITION ------------------------------------------------------------------------------------------------------------------------------------ 2 5C12.18 BLUE-GALAXY RA = 12H 51M 33.44S +/- 1950.0 EXT 1 V = 20.9 +/- 0.1 0.08S, 2 B = 21.2 +/- 0.1 DEC = +35D 53' 28" +/- 1.0" Comments: TOO FAINT FOR GASP ------------------------------------------------------------------------------------------------------------------------------------ 3 5C12.51 BLUE-GALAXY RA = 12H 53M 56.7S +/- 1950 EXT 1 V = 19.8 +/- 0.1 0.08S, 2 B = 20.4 +/- 0.1 DEC = +36D 00' 01.74" +/- 1.0" Comments: GASP POSITION ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 1245c [ 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 5C12.4 FOC/96 IMAGE 512X512 F342W 3360 1 4000S 2 1 DARK TIME CYCLE 2 COND IF TAC OK GUID TOL 0.020" ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 1245c [ 6] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOC/96 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/FOC ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 1.20 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category QUASARS & AGN ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements DARK TIME; CYCLE 2; COND IF TAC OK; GUID TOL 0.020"; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F342W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 5C12.4 5C12.18 5C12.51 ------------------------------------------------------------------------------------------------------------------------------------