5943( 9) - 08/01/95 10:04 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5943 Version: 9 Check-in Date: ********** 1.Proposal Title: Decoupled cores in low-mass early-type galaxies ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Galaxies & Clusters GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Marcella Carollo Sterrewacht Leiden CoI: I. John Danziger European Southern Observatory N CoI: Michael Rich Columbia University N ------------------------------------------------------------------------------------ 6. Abstract We propose to image three low-luminosity early-type galaxies (ETGs) with a kinematically decoupled core (KDC), namely NGC 2434, NGC 7192 and IC 4889. We will image the three galaxies with WFPC2 in the three passbands F450W, F555W and F814W, centered at 4445 Angstrom, 5252 Angstrom, and 8269 Angstrom, respectively. These multi-band exposures will be used to derive optical-optical twodimensional color maps. We intend to investigate: 1) the presence of unresolved point--like sources in these cores, and their colors; 2) the global morphology of these anomalous stellar cores; 3) the relationship between their morphology and the morphology of the dust - if any; 4) any positional dependence of the stellar population properties; 5) the spectral energy distribution (SED) of the stellar population in these cores. Our final aim is to compare the results we will obtain for the KDCs in low-luminosity ETGs with those already found by HST for i) low-luminosity ETGs with ``regular'' core kinematics; ii) high-luminosity ellipticals with KDCs. Anomalies - or similarities - of our targets with respect to the comparison galaxies will provide important insight into the processes of galaxy formation and evolution. ------------------------------------------------------------------------------------ 5943( 9) - 08/01/95 10:04 - [ 2] Observations Description ------------------------ We will obtain broad band F450W, F555W and F814W images for all three target objects. For NGC 2434 and NGC 7192 we will integrate 1200 seconds in F555W, 800 seconds in F814W, and 1900 seconds in F450W. For IC 4889, we will integrate 600 seconds in F555W, 600 seconds in F814W, and 800 seconds in F450W. Our ground based images show that these exposures guarantee at least 1E4 counts per pixel in the center, since the central V band magnitude observed from the ground are in the range 15.5 to 16.5. These exposure times have been computed following eq (6.1) and tables 6.1 and 6.2 of the WFPC2 manual version May 1994. Since the total background including CCD readout, dark current, and sky will in all cases be comparable to or smaller than 100 counts per pixel, the above exposures will guarantee the required S/N of 100. The WFPC2 broad band images will be obtained with the galaxy centered on PC1. All WFPC2 exposures for NGC 2434 and 7192 will be taken with the CR split. No CR split will be done for IC 4889. Number of orbits: We will observe one galaxy per orbit, for a total of three orbits. Two of the three galaxies (NGC 2434 and NGC 7192) can be observed in the CVZ, therefore their visibility is 96 minutes per orbit. IC 4889 has a visibility of 59 minutes. The exposure times given above refer to the effective "on--source" integration times during the relative orbit. The overheads within each orbit are not included in these exposure times, but have been properly taken into account by RPS2. Real Time Justification ----------------------- NGC 2434 and NGC 7192 should be observed in the continuous- viewing-zone. No overlap with other HST observations. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5943( 9) - 08/01/95 10:04 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC2434-NUC GALAXY, Elliptical RA = 07H 34M 51.50S +/- 3.00S, 2000 V = 1388 SURF(V) = 18.42 +/- 0.05 DEC = -69D 17' 01" +/- 3" B-V = 1.0 +/- 0.1 Comments: coordinates are not in GSC system - CVZ observation 2 NGC7192-NUC GALAXY, Elliptical RA = 22H 06M 49.90S +/- 2.00S, 2000 V = 2763 SURF(V) = 18.25 +/- 0.05 DEC = -64D 18' 57" +/- 2" B-V = 1.0 +/- 0.1 Comments: coordinates are not in GSC system 3 IC4889-NUC GALAXY, Elliptical RA = 19H 45M 15.8S +/- 6.00S, 2000 V = 2539 SURF(V) = 17.80 +/- 0.05 DEC = -54D 20' 37" +/- 6" B-V = 1.0 +/- 0.1 Comments: coordinates are not in GSC system 5943( 9) - 08/01/95 10:04 - [ 4] Visit: 01 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 NGC2434-NUC WFPC2 IMAGE PC1 F555W CR-SPLIT=NO 1 600S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC2434-NUC WFPC2 IMAGE PC1 F555W CR-SPLIT=NO 1 700S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC2434-NUC WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 400S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC2434-NUC WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 600S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC2434-NUC WFPC2 IMAGE PC1 F450W CR-SPLIT=NO 1 800S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC2434-NUC WFPC2 IMAGE PC1 F450W CR-SPLIT=NO 1 1100S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 5943( 9) - 08/01/95 10:04 - [ 5] Visit: 02 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 NGC7192-NUC WFPC2 IMAGE PC1 F555W CR-SPLIT=NO 1 600S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC7192-NUC WFPC2 IMAGE PC1 F555W CR-SPLIT=NO 1 700S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC7192-NUC WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 400S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC7192-NUC WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 600S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC7192-NUC WFPC2 IMAGE PC1 F450W CR-SPLIT=NO 1 800S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC7192-NUC WFPC2 IMAGE PC1 F450W CR-SPLIT=NO 1 1100S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 5943( 9) - 08/01/95 10:04 - [ 6] Visit: 03 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 IC4889-NUC WFPC2 IMAGE PC1 F555W CR-SPLIT=NO 1 600S ------------------------------------------------------------------------------------------------------------------------------------ 2 IC4889-NUC WFPC2 IMAGE PC1 F814W CR-SPLIT=NO 1 600S ------------------------------------------------------------------------------------------------------------------------------------ 3 IC4889-NUC WFPC2 IMAGE PC1 F450W CR-SPLIT=NO 1 400S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 4 IC4889-NUC WFPC2 IMAGE PC1 F450W CR-SPLIT=NO 1 600S Comments: MANUAL CR-SPLIT ------------------------------------------------------------------------------------------------------------------------------------ 5943( 9) - 08/01/95 10:04 - [ 7] Summary Form for Proposal 5943 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Galaxies & Clusters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CVZ ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W F814W F450W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC2434-NUC NGC7192-NUC IC4889-NUC ------------------------------------------------------------------------------------------------------------------------------------