6685( 12) - 09/23/96 10:29 - [ 0] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6685 Version: 12 Check-in Date: 23-Sep-1996 10:26:18 1.Proposal Title: Globular Cluster Systems along the Hubble Sequence ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle STELLAR POPULATIONS GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: EDWIN HUIZINGA EUROPEAN SOUTHERN OBSERVATORY CoI: David Clements European Southern Observatory N CoI: Paul Goudfrooij European Southern Observatory N CoI: Markus Kissler-Patig European Southern Observatory N CoI: Dante Minniti Lawrence Livermore National Laboratory N ------------------------------------------------------------------------------------ 6. Abstract Globular Cluster Systems (GCSs) provide a powerful tool to differentiate between competing galaxy formation- and evolution scenarios. However, our current knowledge of GCS in spiral galaxies is based mainly on studies of the Galaxy and M31. Even though GCSs have been detected in other spiral galaxies, ground-based observations barely reach the peak of the Globular-Cluster luminosity function, and do not provide accurate colors. We propose a systematic study of the GCSs in 6 edge-on L* spiral galaxies beyond the Local Group, using WFPC2. These galaxies were carefully selected to meet several stringent criteria. With the new dithering techniques, it will be possible to resolve any faint background galaxies and obtain a clean sample of globular clusters for all galaxies in our sample. This will allow us to study the complete luminosity functions, (V-I) color distributions, and GCS richness for L* galaxies as a function of Hubble type (Sa, Sb, Sc). These data will be used to study the relations between the galaxies' bulge and (thin/thick) disk properties and their GCSs. If, for example, GCS properties correlate with bulge properties, this will rule out any strong evolution along the Hubble Sequence towards earlier type spirals, from Sc to Sa, as has recently been proposed by Pfenniger et al. (1994). ------------------------------------------------------------------------------------ Observations Description ------------------------ We use the F555W and F814W filters of WFPC2 to study the color distributions of the GCSs. For three galaxies we also obtain F450W exposures to help identify GCs. To study the GCLF, we have to reach well beyond the peak, down to absolute magnitudes of M_V=-5.5 (cf. Harris 1991, and Fig. 1.). For the galaxies in our sample this implies limiting magnitudes of m_V=25.5 to 26.6. Exposure times for all our galaxies were estimated using the WFPC2 exposure time calculator, assuming spectral type G0 for the clusters, and reaching a S/N=10, using the WF chips. To improve the photometry and the resolution we use an optimum dithering scheme, as described by Dickinson & Fosbury (1995) or Adorf (1995). Real Time Justification ----------------------- None This project is self--contained, no supporting observations are needed. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6685( 12) - 09/23/96 10:29 - [ 1] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC7814-HALO EXT-CLUSTER, GLOBULAR RA=0H 3M 12.0S +/- 1.0S, DEC=16D J2000 V = 23.4+/-1.5 CLUSTER, BULGE, HALO 7' 52.0" +/- 1.0", PLATE-ID=01G3 B-V = 0.7+/-0.5 V-I = 1.0+/-0.5 SURF-BKG(B) = 24+/-2.0 Comments: flux assumes galactic GCs plus or minus one sigma 21 NGC4517-HALO EXT-CLUSTER, GLOBULAR RA=12H 32M 43.7S +/- 1.0S, J2000 V = 22.5+/-1.5 CLUSTER, BULGE, HALO DEC=00D 5' 39.0" +/- 1.0", PLATE B-V = 0.7+/-0.5 -ID=012G V-I = 1.0+/-0.5 SURF-BKG(B) = 24+/-2.0 Comments: Background varies fast over bulges in nearly all fields 31 NGC4565- EXT-CLUSTER, GLOBULAR RA=12H 36M 23.3S +/- 1.0S, J2000 V = 22.5+/-1.5 HALO1 CLUSTER, BULGE, HALO DEC=25D 57' 9.0" +/- 1.0", PLATE B-V = 0.7+/-0.5 -ID=038A V-I = 1.0+/-0.5 SURF-BKG(B) = 25+/-2.0 32 NGC4565- EXT-CLUSTER, GLOBULAR RA=12H 36M 18.1S +/- 1.0S, J2000 V = 22.5+/-1.5 HALO2 CLUSTER, BULGE, HALO DEC=+25D 58' 35.0" +/- 1.0", B-V = 0.7+/-0.5 PLATE-ID=038A V-I = 1.0+/-0.5 SURF-BKG(B) = 24+/-2.0 33 NGC4565- EXT-CLUSTER, GLOBULAR RA=12H 36M 13.2S +/- 1.0S, J2000 V = 22.5+/-1.5 HALO3 CLUSTER, BULGE, HALO DEC=25D 57' 20.0" +/- 1.0", B-V = 0.7+/-0.5 PLATE-ID=038A V-I = 1.0+/-0.5 SURF-BKG(B) = 27+/-2.0 41 NGC4013-HALO EXT-CLUSTER, GLOBULAR RA=11H 58M 29.5S +/- 1.0S, J2000 V = 23.6+/-1.5 CLUSTER, BULGE, HALO DEC=43D 57' 21.5" +/- 1.0", B-V = 0.7+/-0.5 PLATE-ID=01QY V-I = 1.0+/-0.5 SURF-BKG(B) = 24+/-2.0 51 NGC3628- EXT-CLUSTER, GLOBULAR RA=11H 20M 18.8S +/- 1.0S, J2000 V = 22.0+/-1.5 HALO1 CLUSTER, BULGE, HALO DEC=13D 36' 55.0" +/- 1.0", B-V = 0.7+/-0.5 PLATE-ID=03QR V-I = 1.0+/-0.5 SURF-BKG(B) = 24+/-2.0 52 NGC3628- EXT-CLUSTER, GLOBULAR RA=11H 20M 16.4S +/- 1.0S, J2000 V = 22.0+/-1.5 HALO2 CLUSTER, BULGE, HALO DEC=+13D 33' 34.0" +/- 1.0", B-V = 0.7+/-0.5 PLATE-ID=03QR V-I = 1.0+/-0.5 SURF-BKG(B) = 24+/-2.0 61 IC5176-HALO EXT-CLUSTER, GLOBULAR RA=22H 14M 51.6S +/- 1.0S, DEC=- J2000 V = 23.4+/-1.5 CLUSTER, BULGE, HALO 66D 50' 53.0" +/- 1.0", PLATE- B-V = 0.7+/-0.5 ID=04FE V-I = 1.0+/-0.5 SURF-BKG(B) = 24+/-2.0 6685( 12) - 09/23/96 10:29 - [ 2] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC7814-HAL WFPC2 IMAGE WFALL-F F555W 1 600 S O IX ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC7814-HAL WFPC2 IMAGE WFALL-F F814W 1 600 S O IX ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC7814-HAL WFPC2 IMAGE WFALL-F F450W 1 800 S O IX ------------------------------------------------------------------------------------------------------------------------------------ 6685( 12) - 09/23/96 10:29 - [ 3] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4517-HAL WFPC2 IMAGE WFALL-F F555W DITHER-TYPE=BOX 1 100 S O IX ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4517-HAL WFPC2 IMAGE WFALL-F F814W DITHER-TYPE=BOX 1 160 S O IX ------------------------------------------------------------------------------------------------------------------------------------ 6685( 12) - 09/23/96 10:29 - [ 4] Visit: 03 Visit Requirements: On Hold Comments: Additional Comments: would like to fix orient, but all unschedulable Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4565-HAL WFPC2 IMAGE WFALL-F F555W DITHER-TYPE=LINE 1 160 S O1 IX ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4565-HAL WFPC2 IMAGE WFALL-F F814W DITHER-TYPE=LINE 1 160 S O1 IX ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC4565-HAL WFPC2 IMAGE WFALL-F F450W DITHER-TYPE=LINE 1 200 S O1 IX ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC4565-HAL WFPC2 IMAGE WFALL-F F555W DITHER-TYPE=LINE 1 160 S O2 IX ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC4565-HAL WFPC2 IMAGE WFALL-F F814W DITHER-TYPE=LINE 1 160 S O2 IX ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC4565-HAL WFPC2 IMAGE WFALL-F F450W DITHER-TYPE=LINE 1 230 S O2 IX ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC4565-HAL WFPC2 IMAGE WFALL-F F555W DITHER-TYPE=LINE 1 160 S O3 IX ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC4565-HAL WFPC2 IMAGE WFALL-F F814W DITHER-TYPE=LINE 1 160 S O3 IX ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC4565-HAL WFPC2 IMAGE WFALL-F F450W DITHER-TYPE=LINE 1 200 S O3 IX ------------------------------------------------------------------------------------------------------------------------------------ 6685( 12) - 09/23/96 10:29 - [ 5] Visit: 04 Visit Requirements: SCHED 40% On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4013-HAL WFPC2 IMAGE WFALL-F F555W DITHER-TYPE=LINE 1 400 S O IX ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC4013-HAL WFPC2 IMAGE WFALL-F F814W CR-SPLIT=0.45 1 1100 S O IX ------------------------------------------------------------------------------------------------------------------------------------ 6685( 12) - 09/23/96 10:29 - [ 6] Visit: 05 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC3628-HAL WFPC2 IMAGE WFALL-F F555W DITHER-TYPE=BOX 1 100 S O1 IX ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC3628-HAL WFPC2 IMAGE WFALL-F F814W DITHER-TYPE=BOX 1 160 S O1 IX ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC3628-HAL WFPC2 IMAGE WFALL-F F555W DITHER-TYPE=BOX 1 100 S O2 IX ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC3628-HAL WFPC2 IMAGE WFALL-F F814W DITHER-TYPE=BOX 1 160 S O2 IX ------------------------------------------------------------------------------------------------------------------------------------ 6685( 12) - 09/23/96 10:29 - [ 7] Visit: 06 Visit Requirements: CVZ On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IC5176-HALO WFPC2 IMAGE WFALL-F F555W 1 800 S IX ------------------------------------------------------------------------------------------------------------------------------------ 2 IC5176-HALO WFPC2 IMAGE WFALL-F F814W 1 1200 S IX ------------------------------------------------------------------------------------------------------------------------------------ 3 IC5176-HALO WFPC2 IMAGE WFALL-F F450W CR-SPLIT=0.52 1 2150 S IX ------------------------------------------------------------------------------------------------------------------------------------ 6685( 12) - 09/23/96 10:29 - [ 8] Summary Form for Proposal 6685 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters DITHER-TYPE=BOX DITHER-TYPE=LINE CR-SPLIT=0.45 CR-SPLIT=0.52 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SCHED 40% CVZ ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F814W F450W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC7814-HALO NGC4517-HALO NGC4565-HALO1 NGC4565-HALO2 NGC4565-HALO3 NGC4013-HALO NGC3628-HALO1 NGC3628-HALO2 IC5176-HALO ------------------------------------------------------------------------------------------------------------------------------------