8208( 7) - 09/19/00 11:03 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8208 Version: 7 Check-in Date: 19-Sep-2000 11:02:40 1.Proposal Title: Galaxy Interactions, Tidal Debris, and the Origin of Intracluster Light in the Coma Cluster ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 8 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Michael Gregg University of California - Davis CoI: Dr. Michael West Saint Mary's University, Halifax N ------------------------------------------------------------------------------------ 5. Abstract We propose to obtain deep WFPC2 and parallel STIS images of low surface brightness tidal debris that we have recently discovered in the Coma cluster; the material is being stripped from its parent galaxy and added to the general cluster background. These images will enable direct study of the brightest blue and red supergiants, globular clusters, and star forming regions which may be present, or will place strong limits on the numbers of such objects and any recent star formation. We also propose similar observations of the parent spiral, NGC4911, in the core of Coma; it is losing its ISM to the hot cluster gas and as well as the low surface brightness tidal debris. By imaging this galaxy, we will get a high resolution look at the interaction between the galaxy and interstellar medium, as well as any ram-pressure induced star formation. The tidal features in Coma appear to be adding material to the background light and cD galaxy envelopes at a significant rate; determining the nature of the added stellar population and the interactions which produce it are critical to understanding the formation and evolution of cD galaxies and clusters. ------------------------------------------------------------------------------------ 8208( 7) - 09/19/00 11:03 - [ 2] Observations Description ------------------------ We will image two fields using the F606W and F814W filters, spending 2 orbits in each filter. F606W is not the ``standard'' V filter of WFPC2, however, it is necessary to reach as faint as possible to detect any individual stars and F606W has roughly twice the integrated throughputs of F555W. Holtzman et al.\ have shown that the transformation from F606W to Johnson V is not problematic; this filters were used to observe the Hubble Deep Field. In two orbits (~ 5000s), the Exposure Time Calculator estimates that WFPC2 will reach S/N of 3-5 for red and blue spectral types with V = 28.5. This is equivalent to M_V = - 6.5; the brightest red and blue supergiants will be 1 to 2 magnitudes brighter with correspondingly higher S/N. We will place the PC on the nucleus of NGC4911 to make best use of the higher sampling. Two WFPC2 fields are required to image NGC4911 and its associated LSB feature STIS parallel imaging using the 50CCD and F28X50LP bandpasses will also be used to obtain deep images of additional fields on or near smaller early type galaxies in the Coma cluster. In a 2 orbit integration with average zodiacal light and Earthshine, STIS images will reach a S/N ~ 5 in each passband for globular clusters with V=28.5, about 1 magnitude fainter than the peak of the luminosity function. All exposures will be CRsplit by 3 per orbit, which also allows for subpixel dithering. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Paper Products: YES Media: ELECTRONIC Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 8208( 7) - 09/19/00 11:03 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC4911-NUC GALAXY, SPIRAL RA=13H 00M 55.77S +/- 0S, J2000 V=+7985 V = 13.00 DEC=+27D 47' 29.0" +/-0"PLATE- B-V = 0.70 ID=002K Coordinate Source: Comments: PC centered on nucleus 2 COMA-DEBRIS- GALAXY, LSB RA=13H 01M 00.723S +/- 0S, J2000 V=+7985 V = 17.00 3 DEC=+27D 45' 18.0" +/-0"PLATE- B-V = 0.70 ID=002K Coordinate Source: Comments: WF3 on peak of debris 8208( 7) - 09/19/00 11:03 - [ 4] Visit: 01 Visit Priority: Visit Requirements: ORIENT 317D TO 317D On Hold Comments: Additional Comments: PC on nucleus; STIS to north on blank sky Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 101 NGC4911-NUC WFPC2 IMAGE PC1 F606W CR-SPLIT=0.5333 ,CLOCKS=YES 1 1600 S PAR 102 with 101 Comments: 1-2 of 6 F606W ------------------------------------------------------------------------------------------------------------------------------------ 102 NGC4911-NUC STIS/C ACCUM 50CCD MIRROR 1 1700 S CD Comments: 1-2 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 103 NGC4911-NUC WFPC2 IMAGE PC1 F606W CR-SPLIT=NO ,CLOCKS=YES 1 800 S PAR 104 with 103 POS TARG 0.46667, 0.46667 Comments: 3 of 6 F606W ------------------------------------------------------------------------------------------------------------------------------------ 104 NGC4911-NUC STIS/C ACCUM 50CCD MIRROR CR-SPLIT=NO 1 850 S CD Comments: 3 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 105 NGC4911-NUC WFPC2 IMAGE PC1 F606W CR-SPLIT=0.5333 ,CLOCKS=YES 1 1600 S PAR 106 with 105 POS TARG -0.46667, -0.46667 Comments: 4-5 of 6 F606W ------------------------------------------------------------------------------------------------------------------------------------ 106 NGC4911-NUC STIS/C ACCUM 50CCD MIRROR 1 1700 S CD Comments: 4-5 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 107 NGC4911-NUC WFPC2 IMAGE PC1 F606W CR-SPLIT=NO ,CLOCKS=YES 1 800 S PAR 108 with 107 POS TARG 0.46667, 0.46667 Comments: 6 of 6 F606W ------------------------------------------------------------------------------------------------------------------------------------ 108 NGC4911-NUC STIS/C ACCUM 50CCD MIRROR CR-SPLIT=NO 1 950 S CD Comments: 6 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 109 NGC4911-NUC WFPC2 IMAGE PC1 F814W CR-SPLIT=0.5333 ,CLOCKS=YES 1 1600 S PAR 110 with 109 Comments: 1-2 of 6 F814W ------------------------------------------------------------------------------------------------------------------------------------ 110 NGC4911-NUC STIS/C ACCUM 50CCD MIRROR 1 1700 S CD Comments: 7-8 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 111 NGC4911-NUC WFPC2 IMAGE PC1 F814W CR-SPLIT=NO ,CLOCKS=YES 1 800 S PAR 112 with 111 POS TARG 0.46667, 0.46667 Comments: 3 of 6 F814W ------------------------------------------------------------------------------------------------------------------------------------ 112 NGC4911-NUC STIS/C ACCUM 50CCD MIRROR CR-SPLIT=NO 1 950 S CD Comments: 9 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 8208( 7) - 09/19/00 11:03 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 113 NGC4911-NUC WFPC2 IMAGE PC1 F814W CR-SPLIT=0.5333 ,CLOCKS=YES 1 1600 S PAR 114 with 113 POS TARG -0.46667, -0.46667 Comments: 4-5 of 6 F814W ------------------------------------------------------------------------------------------------------------------------------------ 114 NGC4911-NUC STIS/C ACCUM 50CCD MIRROR 1 1700 S CD Comments: 10-11 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 115 NGC4911-NUC WFPC2 IMAGE PC1 F814W CR-SPLIT=NO ,CLOCKS=YES 1 800 S PAR 116 with 115 POS TARG 0.46667, 0.46667 Comments: 6 of 6 F814W ------------------------------------------------------------------------------------------------------------------------------------ 116 NGC4911-NUC STIS/C ACCUM 50CCD MIRROR CR-SPLIT=NO 1 950 S CD Comments: 12 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 8208( 7) - 09/19/00 11:03 - [ 6] Visit: 02 Visit Priority: Visit Requirements: ORIENT 225D TO 227D On Hold Comments: Additional Comments: Second of two visits for project Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 201 COMA-DEBRIS WFPC2 IMAGE WF3 F606W CR-SPLIT=0.5333 ,CLOCKS=YES 1 1600 S PAR 202 with 201 -3 Comments: 1-2 of 6 F606W ------------------------------------------------------------------------------------------------------------------------------------ 202 COMA-DEBRIS STIS/C ACCUM 50CCD MIRROR 1 1700 S -3 CD Comments: 1-2 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 203 COMA-DEBRIS WFPC2 IMAGE WF3 F606W CR-SPLIT=NO ,CLOCKS=YES 1 800 S PAR 204 with 203 POS TARG -3 0.46667, 0.46667 Comments: 3 of 6 F606W ------------------------------------------------------------------------------------------------------------------------------------ 204 COMA-DEBRIS STIS/C ACCUM 50CCD MIRROR CR-SPLIT=NO 1 850 S -3 CD Comments: 3 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 205 COMA-DEBRIS WFPC2 IMAGE WF3 F606W CR-SPLIT=0.5333 ,CLOCKS=YES 1 1600 S PAR 206 with 205 POS TARG -3 -0.46667, -0.46667 Comments: 4-5 of 6 F606W ------------------------------------------------------------------------------------------------------------------------------------ 206 COMA-DEBRIS STIS/C ACCUM 50CCD MIRROR 1 1700 S -3 CD Comments: 4-5 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 207 COMA-DEBRIS WFPC2 IMAGE WF3 F606W CR-SPLIT=NO ,CLOCKS=YES 1 800 S PAR 208 with 207 POS TARG -3 0.46667, 0.46667 Comments: 6 of 6 F606W ------------------------------------------------------------------------------------------------------------------------------------ 208 COMA-DEBRIS STIS/C ACCUM 50CCD MIRROR CR-SPLIT=NO 1 950 S -3 CD Comments: 6 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 209 COMA-DEBRIS WFPC2 IMAGE WF3 F814W CR-SPLIT=0.5333 ,CLOCKS=YES 1 1600 S PAR 210 with 209 -3 Comments: 1-2 of 6 F814W ------------------------------------------------------------------------------------------------------------------------------------ 210 COMA-DEBRIS STIS/C ACCUM 50CCD MIRROR 1 1700 S -3 CD Comments: 7-8 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 211 COMA-DEBRIS WFPC2 IMAGE WF3 F814W CR-SPLIT=NO ,CLOCKS=YES 1 800 S PAR 212 with 211 POS TARG -3 0.46667, 0.46667 Comments: 3 of 6 F814W ------------------------------------------------------------------------------------------------------------------------------------ 8208( 7) - 09/19/00 11:03 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 212 COMA-DEBRIS STIS/C ACCUM 50CCD MIRROR CR-SPLIT=NO 1 950 S -3 CD Comments: 9 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 213 COMA-DEBRIS WFPC2 IMAGE WF3 F814W CR-SPLIT=0.5333 ,CLOCKS=YES 1 1600 S PAR 214 with 213 POS TARG -3 -0.46667, -0.46667 Comments: 4-5 of 6 F814W ------------------------------------------------------------------------------------------------------------------------------------ 214 COMA-DEBRIS STIS/C ACCUM 50CCD MIRROR 1 1700 S -3 CD Comments: 10-11 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 215 COMA-DEBRIS WFPC2 IMAGE WF3 F814W CR-SPLIT=NO ,CLOCKS=YES 1 800 S PAR 216 with 215 POS TARG -3 0.46667, 0.46667 Comments: 6 of 6 F814W ------------------------------------------------------------------------------------------------------------------------------------ 216 COMA-DEBRIS STIS/C ACCUM 50CCD MIRROR CR-SPLIT=NO 1 950 S -3 CD Comments: 12 of 12 50CCD ------------------------------------------------------------------------------------------------------------------------------------ 8208( 7) - 09/19/00 11:03 - [ 8] Summary Form for Proposal 8208 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PC1 50CCD WF3 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 STIS/CCD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=0.5333 CLOCKS=YES CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 317D TO 317D PAR 102 with 101 PAR 104 with 103 POS TARG 0.46667, 0.46667 PAR 106 with 105 POS TARG -0.46667, -0.46667 PAR 108 with 107 POS TARG 0.46667, 0.46667 PAR 110 with 109 PAR 112 with 111 POS TARG 0.46667, 0.46667 PAR 114 with 113 POS TARG -0.46667, -0.46667 PAR 116 with 115 POS TARG 0.46667, 0.46667 ORIENT 225D TO 227D PAR 202 with 201 PAR 204 with 203 POS TARG 0.46667, 0.46667 PAR 206 with 205 POS TARG -0.46667, -0.46667 PAR 208 with 207 POS TARG 0.46667, 0.46667 PAR 210 with 209 PAR 212 with 211 POS TARG 0.46667, 0.46667 PAR 214 with 213 POS TARG -0.46667, -0.46667 PAR 216 with 215 POS TARG 0.46667, 0.46667 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W MIRROR F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC4911-NUC COMA-DEBRIS-3 ------------------------------------------------------------------------------------------------------------------------------------