5994( 5) - 11/21/95 17:31 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5994 Version: 5 Check-in Date: ********** 1.Proposal Title: HST IMAGES OF NEW CANDIDATES FOR DISTANT PROTO-DWARF-ELLIPTICALS ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Galaxies & Clusters GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: David Koo Lick Observatory, University of California, Santa Cruz CoI: Garth Illingworth Lick Observatory, University of N California, Santa Cruz CoI: Sandra Faber Lick Observatory, University of N California, Santa Cruz CoI: Rafael Guzman Lick Observatory, University of N California, Santa Cruz CoI: Richard Kron Yerkes Observatory N CoI: Matthew Bershady Department of Astronomy and Astrophysics, N Pennsylvania State University ------------------------------------------------------------------------------------ 6. Abstract We propose to obtain WFPC-2 images in F814W and F606W of 10 very compact, very blue galaxies to measure their sizes, light profiles and colors. Such HST data are critical to convert new Keck velocity width data into masses and to decipher the nature of extremely compact galaxies with high luminosities. Though faint (B ~ 20- 23) and distant (z ~ 0.1 to 0.7), we have measured their velocity widths on the Keck echelle spectrograph. All but two galaxies lie within one magnitude of L^* and yet they exhibit velocity widths Sigma = 28 - 103 km s^-1. Such small widths compared to those of typical L^* galaxies (Sigma ~200 km s^-1) suggest that some compact galaxies could be 1000 times less massive. Their extreme surface brightnesses, very blue colors, and luminosities can be understood to result from a recent burst of star formation. Without additional prior or subsequent star formation, these galaxies will fade by ~5 mag to dwarf luminosities after a few Gyrs. Thus we are perhaps witnessing, in-situ, the birth of today's low surface brightness dwarf ellipticals like NGC 205 and Fornax. Besides yielding masses as a new dimension for faint galaxy studies, the HST size and color data will provide several critical tests of our interpretation. ------------------------------------------------------------------------------------ 5994( 5) - 11/21/95 17:31 - [ 2] Observations Description ------------------------ We want to use WFPC2 to image a sample of 10 very faint, very blue, compact galaxies for which Keck echelle data have yielded emission-line velocity profiles. Four of these objects (i.e. sa57 4259/3605 and herc 13925/14358) can be observed in pairs within the same field of view of WFPC2. Each target, whether single or pair, will be allocated one orbit for a total of 8 for this sample. Single objects will be observed with the PC (centered in PC1). The higher spatial resolution is required given the compactness of our targets. However, for objects in pairs the whole field of WFPC2 is needed. In this case, the mid point between the two objects is centered in WFALL. Orientation angles and offsets are specified for each of these observations. For single objects, roll constraints are also given but these are not essential. Each target will be exposed for a total of ~700s and ~900s in the F606W and the F814W filters, respectively. We plan to take two exposures in each filter slightly offset from each other to facilitate the removal of cosmic rays. The F606W filter will provide rest-frame U or B for most of our sample; F814W will provide rest-frame V on average and allow a common filter for photometry. The longer exposure in F814W is to account for the extreme blueness of the galaxies. These exposures are based on our experience with the previous CNELG HST data and MDS Cycle 4 data and should be adequate to extract light profiles and to detect low surface brightness extended structures. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5994( 5) - 11/21/95 17:31 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SA57-4259 GALAXY, DWARF COMPACT RA=13H 5M 34.6S +/- 1S, DEC=29D B1950 Z = V = 21.8 29' 44" +/- 1" 0.601 Comments: (SIGMA=52). GALAXY PAIR WITH D=153"; SECOND OBJECT: SA57-3605, Z = 0.392, V = 22.1, (SIGMA=37). 2 SA57-5482 GALAXY, DWARF COMPACT RA=13H 6M 46.0S +/- 1S, DEC=29D B1950 Z = V = 21.3 31' 55" +/- 1" 0.453 Comments: (SIGMA=60) 3 SA57-10601 GALAXY, DWARF COMPACT RA=13H 6M 25.0S +/- 1S, DEC=29D B1950 Z = V = 21.3 39' 39" +/- 1" 0.438 Comments: (SIGMA=43) 4 SA57-17731 GALAXY, DWARF COMPACT RA=13H 6M 15.5S +/- 1S, DEC=29D B1950 Z = V = 21.0 50' 47" +/- 1" 0.662 Comments: (SIGMA=103) 5 SA57-7042 GALAXY, DWARF COMPACT RA=13H 5M 03.2S +/- 1S, DEC=29D B1950 Z = V = 22.0 34' 26" +/- 1" 0.525 Comments: (SIGMA=116) 6 HERC-13925 GALAXY, DWARF COMPACT RA=17H 17M 50.1S +/- 1S, DEC=50D B1950 Z = V = 20.0 06' 43" +/- 1" 0.220 Comments: (SIGMA=100). GALAXY PAIR WITH D=116"; SECOND OBJECT: HERC-14358, Z = 0.033, B = 22.5, (SIGMA=21). 7 HERC-13088 GALAXY, DWARF COMPACT RA=17H 19M 04.4S +/- 1S, DEC=50D B1950 Z = V = 20.7 03' 60" +/- 1" 0.436 Comments: (SIGMA=45) 8 SA57-1501 GALAXY, DWARF COMPACT RA=13H 5M 43.9S +/- 1S, DEC=29D B1950 Z = V = 21.7 24' 59" +/- 1" 0.499 Comments: (SIGMA=61) 5994( 5) - 11/21/95 17:31 - [ 4] Visit: 01 Visit Requirements: ORIENTation 152D TO 158D 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 SA57-4259 WFPC2 IMAGE WFALL- F606W CR-SPLIT=NO 1 400S FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 SA57-4259 WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 500S FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 SA57-4259 WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 400S POS TARG 0.5, -0.5 FIX ------------------------------------------------------------------------------------------------------------------------------------ 4 SA57-4259 WFPC2 IMAGE WFALL- F606W CR-SPLIT=NO 1 300S POS TARG 0.5, -0.5 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5994( 5) - 11/21/95 17:31 - [ 5] Visit: 02 Visit Requirements: ORIENTation 225D TO 315D 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 SA57-5482 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 400S ------------------------------------------------------------------------------------------------------------------------------------ 2 SA57-5482 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 500S ------------------------------------------------------------------------------------------------------------------------------------ 3 SA57-5482 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 400S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 4 SA57-5482 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 300S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5994( 5) - 11/21/95 17:31 - [ 6] Visit: 03 Visit Requirements: ORIENTation 45D TO 225D 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 SA57-1501 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 400S ------------------------------------------------------------------------------------------------------------------------------------ 2 SA57-1501 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 500S ------------------------------------------------------------------------------------------------------------------------------------ 3 SA57-1501 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 400S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 4 SA57-1501 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 300S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5994( 5) - 11/21/95 17:31 - [ 7] Visit: 04 Visit Requirements: ORIENTation 75D TO 205D 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 SA57-17731 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 400S ------------------------------------------------------------------------------------------------------------------------------------ 2 SA57-17731 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 500S ------------------------------------------------------------------------------------------------------------------------------------ 3 SA57-17731 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 400S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 4 SA57-17731 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 300S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5994( 5) - 11/21/95 17:31 - [ 8] Visit: 05 Visit Requirements: ORIENTation 75D TO 225D 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 SA57-7042 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 400S ------------------------------------------------------------------------------------------------------------------------------------ 2 SA57-7042 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 500S ------------------------------------------------------------------------------------------------------------------------------------ 3 SA57-7042 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 400S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 4 SA57-7042 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 300S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5994( 5) - 11/21/95 17:31 - [ 9] Visit: 06 Visit Requirements: ORIENTation 189D TO 229D 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 HERC-13925 WFPC2 IMAGE WFALL- F606W CR-SPLIT=NO 1 400S FIX ------------------------------------------------------------------------------------------------------------------------------------ 2 HERC-13925 WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 500S FIX ------------------------------------------------------------------------------------------------------------------------------------ 3 HERC-13925 WFPC2 IMAGE WFALL- F814W CR-SPLIT=NO 1 500S POS TARG 0.5, -0.5 FIX ------------------------------------------------------------------------------------------------------------------------------------ 4 HERC-13925 WFPC2 IMAGE WFALL- F606W CR-SPLIT=NO 1 400S POS TARG 0.5, -0.5 FIX ------------------------------------------------------------------------------------------------------------------------------------ 5994( 5) - 11/21/95 17:31 - [ 10] Visit: 07 Visit Requirements: ORIENTation 150D TO 310D 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 HERC-13088 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 400S ------------------------------------------------------------------------------------------------------------------------------------ 2 HERC-13088 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 500S ------------------------------------------------------------------------------------------------------------------------------------ 3 HERC-13088 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 500S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 4 HERC-13088 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 300S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5994( 5) - 11/21/95 17:31 - [ 11] Visit: 08 Visit Requirements: ORIENTation 150D TO 190D 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 SA57-10601 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 400S ------------------------------------------------------------------------------------------------------------------------------------ 2 SA57-10601 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 500S ------------------------------------------------------------------------------------------------------------------------------------ 3 SA57-10601 WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 400S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 4 SA57-10601 WFPC2 IMAGE PC1 F606W CR-SPLIT=NO 1 300S POS TARG 0.5, -0.5 ------------------------------------------------------------------------------------------------------------------------------------ 5994( 5) - 11/21/95 17:31 - [ 12] Summary Form for Proposal 5994 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Galaxies & Clusters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENTation 152D TO 158D POS TARG 0.5, -0.5 ORIENTation 225D TO 315D ORIENTation 45D TO 225D ORIENTation 75D TO 205D ORIENTation 75D TO 225D ORIENTation 189D TO 229D ORIENTation 150D TO 310D ORIENTation 150D TO 190D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SA57-4259 SA57-5482 SA57-1501 SA57-17731 SA57-7042 HERC-13925 HERC-13088 SA57-10601 ------------------------------------------------------------------------------------------------------------------------------------