13065( 6) - 02-Aug-2012 17:27:35 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13065 Version: 6 Check-in Time: 02-Aug-2012 17:27:35 STScI Edit Number: 3 Title Imaging the Host Galaxy and Cluster of Hercules A ------------------------------------------------------------------------------------ Type Cycle GO/DD 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Stefi A. Baum Rochester Institute of Technology Y CoI: John M Stoke Associated Universities, Inc. N CoI: Dr. Christopher P. O'Dea Rochester Institute of Technology N CoI: Dr. Fred K. Y. Lo Associated Universities, Inc. N ------------------------------------------------------------------------------------ Abstract We propose to image the host galaxy and surrounding cluster of the powerful radio galaxy Hercules A. The observations will be used to (1) study the colors and morphologies of the cluster members and to look for interactions with the extended radio lobes, (2) investigate the nature of the obscuring rings in the host galaxy, and (3) create a visually appealing color image to be used in a press release with new very deep EVLA observations. ------------------------------------------------------------------------------------ Observations Description ------------------------ We want wide filters (for S/N) which avoid bright emission lines (so as to give stellar con- tinuum only to allow interpretation of the colors). The optical spectrum by Buttiglioni et al 2009 shows the [OII] 3727 and H-alpha+[NII] lines are bright, the [OI] 6300 line is moderate, and the [OIII] 5007 line is faint (and likely to be confined to the nucleus). So the wavelength range between [OII] and [OI] in the observers frame 4300-7270 is available. The F606W filter fits in this range and has a high throughput. F625W also fits but has smaller bandwidth so will be somewhat less sensitive. The F336W filter fits blue-ward of [OII] and gives a long baseline in wavelength for measuring galaxy colors and obscuration in the rings. The broad red filter F814W will allow the spectral energy distribution (SED) of the stellar pop- ulations to be determined. To calculate exposure times we consider A1689, a well studied Abell cluster at similar redshift (z=0.183). The faint end of the galaxy luminosity function is at V=24 (Wilson etal. 1997). This can be reached in one orbit each with the F606W and F814W filters. In one orbit the F336W (U) filter will provide good detections of cluster ellipticals down to V=21, and deeper for any galaxies which are star forming, and will allow a measure of the optical depth of the obscuring rings. The observations in each filter should be dithered to allow removal of hot pixels, cosmic rays, and the chip gap. Real Time Justification ----------------------- Calibration Justification ------------------------- 13065( 6) - 02-Aug-2012 17:27:35 - [ 2] Additional Comments ------------------- ------------------------------------------------------------------------------------ 13065( 6) - 02-Aug-2012 17:27:35 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HER-A GALAXY, LOBE RA=16H51M8.1470S +/- 0.1", J2000 V = 18.25 DEC=+04D59'33.32" +/- 0.1" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 13065( 6) - 02-Aug-2012 17:27:35 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type LINE LINE Pattern_Purpose MOSAIC DITHER Number_Of_Points 2 2 Point_Spacing 40 1.0 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 90 45 Angle_Between_Sides Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ 13065( 6) - 02-Aug-2012 17:27:35 - [ 5] Visit: 01 Visit Requirements: ORIENT 70D TO 80 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HER-A WFC3/UVI ACCUM UVIS-CENT F606W CR-SPLIT=NO 1 440 S PATTERN 1 1-2 S ER ------------------------------------------------------------------------------------------------------------------------------------ 2 HER-A WFC3/UVI ACCUM UVIS-CENT F814W CR-SPLIT=NO 1 482 S GS ACQ SCENARIO BASE1B3 S ER ------------------------------------------------------------------------------------------------------------------------------------ 3 HER-A WFC3/UVI ACCUM UVIS-CENT F336W CR-SPLIT=NO 1 914 S PATTERN 1 3 S ER ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ HER-A 1 WFC3/UVI ACCUM UVIS-CEN F606W 1 1 none none 1 N/A S TER HER-A 1 WFC3/UVI ACCUM UVIS-CEN F606W 1 2 none none 1 N/A S TER HER-A 1 WFC3/UVI ACCUM UVIS-CEN F606W 2 1 none none 1 N/A S TER HER-A 1 WFC3/UVI ACCUM UVIS-CEN F606W 2 2 none none 2 N/A S TER HER-A 2 WFC3/UVI ACCUM UVIS-CEN F814W 1 1 none none 1 N/A S TER HER-A 2 WFC3/UVI ACCUM UVIS-CEN F814W 1 2 none none 1 N/A S TER HER-A 2 WFC3/UVI ACCUM UVIS-CEN F814W 2 1 none none 2 N/A S TER HER-A 2 WFC3/UVI ACCUM UVIS-CEN F814W 2 2 none none 2 N/A S TER HER-A 3 WFC3/UVI ACCUM UVIS-CEN F336W 1 1 none none 2 N/A S TER HER-A 3 WFC3/UVI ACCUM UVIS-CEN F336W 1 2 none none 3 N/A S TER HER-A 3 WFC3/UVI ACCUM UVIS-CEN F336W 2 1 none none 3 N/A S TER HER-A 3 WFC3/UVI ACCUM UVIS-CEN F336W 2 2 none none 3 N/A S TER 13065( 6) - 02-Aug-2012 17:27:35 - [ 6] Summary Form for Proposal 13065 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3, ORIENT 70D TO 80 D, PATTERN 1 1-2, PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F336W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names HER-A ------------------------------------------------------------------------------------------------------------------------------------