15290( 2) - 13-Jul-2017 12:48:55 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15290 Version: 2 Check-in Time: 13-Jul-2017 12:48:55 STScI Edit Number: 0 Title Spectacular optical filaments in the X-ray brightest group cool core ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Ming Sun University of Alabama in Huntsville Y CoI: Dr. Megan Donahue Michigan State University N CoI: Laurence David Smithsonian Institution Astrophysical N Observatory CoI: Dr. Stephen Hamer Observatoire de Paris N CoI: Dr. Alastair C. Edge Durham Univ. N CoI: Dr. Rebecca E. A. Canning Stanford University N CoI: Dr. Norbert Werner Stanford University N CoI: Prof. Mark Voit Michigan State University N CoI: Dr. Francoise Combes Observatoire de Paris N CoI: Prof. Andrew C. Fabian University of Cambridge N CoI: Massimo Gaspari Princeton University N CoI: Dr. Helen R Russell University of Cambridge N ------------------------------------------------------------------------------------ Abstract Studies of the cold gas and star formation in X-ray cool cores are important for understanding galaxy formation and evolution. An eye-catching and mysterious phenomenon in X-ray cool cores is the optical emission-line nebula, which is similar to those filaments found around distant radio galaxies and some proto-galaxies. These optical emission-line nebulae are markers of the cold gas and the AGN feedback process. They provide important kinematic and timescale constraints on gas flows in cool cores, from ~ 50 kpc down to regions within the Bondi radius on scales of 50 - 100 pc. We have obtained optical narrow-band imaging data for a sample of cool cores in galaxy groups and some interesting systems were revealed. In this proposal, we ask for the WFC3 narrow-band imaging data of the brightest and the closest Halpha nebula in the sample, as well as the NUV data to study the associated star formation. The proposed HST observations, in combination with our rich supporting data in other bands, will provide important constraints on the properties of optical filaments, the strength of magnetic field and the star formation history in the cool core and energy transfer. ------------------------------------------------------------------------------------ Observations Description ------------------------ Our science goals are to study optical filaments and star formation in NGC 5044. At NGC 5044's distance, 0.04'' = 6.0 pc so similar filaments as those in NGC 1275 and NGC 4696 (60 - 70 pc width from Fabian et al. 2008, 2016) will be easily resolved into many threads. We plan to spend five orbits on NGC 5044 with WFC3. The narrow-band imaging with the F665N filter will take three and a half orbits for an unprecedented sharp view on an emission-line nebula. The remaining time is used for the continuum imaging (F814W) and the search for young star clusters (F300X). For NGC 5044's redshift of 0.00928, Halpha and the 15290( 2) - 13-Jul-2017 12:48:55 - [ 2] two [NII] lines are at 6626 A, 6611 A and 6646 A respectively (at vacuum not at air), well covered by the F665N filter with > 10% throughput at 6588 A - 6724 A. We have run WFC3/ETC simulations. The optical filaments in NGC 5044 have surface brightness of (1.4 - 6) x 10^-16 ergs s^-1 cm^-2 arcsec^-2 (Halpha+[NII] fluxes). With the relative continuum levels, the brightest and the faintest filaments will have 5.9-sigma detection in 2x2 pixels and 3.4-sigma detection in 4x4 pixels respectively in 8400 sec. The ground Halpha+[NII] data were taken at ~ 1.0'' seeing so the actual surface brightness of the optical filaments should be higher. Averaging along the filaments allows their widths measured to the limits of the resolution. Faint ones not shown from the ground can also be revealed. The continuum image will be taken with the F814W filter for about 800 sec. ------------------------------------------------------------------------------------ 15290( 2) - 13-Jul-2017 12:48:55 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5044-1 GALAXY, COOLING FLOW, RA=13H15M24.2980S, J2000 V = 11.4 ELLIPTICAL, EMISSION DEC=-16D23'5.72" LINE NEBULA, FILAMENT, STAR FORMING REGION Reference Frame: ICRS Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5044-2 GALAXY, COOLING FLOW, RA=13H15M23.6390S, J2000 V = 11.4 ELLIPTICAL, EMISSION DEC=-16D23'4.03" LINE NEBULA, FILAMENT, STAR FORMING REGION Reference Frame: ICRS Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC5044-3 GALAXY, COOLING FLOW, RA=13H15M23.7870S, J2000 V = 11.4 ELLIPTICAL, EMISSION DEC=-16D23'13.19" LINE NEBULA, FILAMENT, STAR FORMING REGION Reference Frame: ICRS Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC5044-4 GALAXY, COOLING FLOW, RA=13H15M24.3510S, J2000 V = 11.4 ELLIPTICAL, EMISSION DEC=-16D23'13.79" LINE NEBULA, FILAMENT, STAR FORMING REGION Reference Frame: ICRS Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 15290( 2) - 13-Jul-2017 12:48:55 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-GAP-LINE Pattern_Purpose MOSAIC Number_Of_Points 2 Point_Spacing 2.414 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.759 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-MOS-DITH-LINE Pattern_Purpose MOSAIC Number_Of_Points 3 Point_Spacing 2.4 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.754 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 15290( 2) - 13-Jul-2017 12:48:55 - [ 5] Visit: 01 (F665N) Visit Requirements: 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5044-1 WFC3/UVI ACCUM UVIS-CENT F665N FLASH=8 1 1370 S PATTERN 1 1 S ER (2740 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5044-2 WFC3/UVI ACCUM UVIS-CENT F665N FLASH=7 1 1426 S PATTERN 1 2 S ER (2852 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC5044-3 WFC3/UVI ACCUM UVIS-CENT F665N FLASH=7 1 1426 S PATTERN 1 3 S ER (2852 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC5044-1 1 WFC3/UVI ACCUM UVIS-CEN F665N 1 none none none 1 N/A S TER NGC5044-1 1 WFC3/UVI ACCUM UVIS-CEN F665N 2 none none none 1 N/A S TER NGC5044-2 2 WFC3/UVI ACCUM UVIS-CEN F665N 1 none none none 2 N/A S TER NGC5044-2 2 WFC3/UVI ACCUM UVIS-CEN F665N 2 none none none 2 N/A S TER NGC5044-3 3 WFC3/UVI ACCUM UVIS-CEN F665N 1 none none none 3 N/A S TER NGC5044-3 3 WFC3/UVI ACCUM UVIS-CEN F665N 2 none none none 3 N/A S TER 15290( 2) - 13-Jul-2017 12:48:55 - [ 6] Visit: 02 (F300X and others) Visit Requirements: 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5044-4 WFC3/UVI ACCUM UVIS-CENT F300X FLASH=9 1 873 S PATTERN 2 1 S ER see below (2607 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5044-4 WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 417 S (834 PATTERN 1 2-3 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC5044-4 WFC3/UVI ACCUM UVIS-CENT F665N FLASH=9 1 842 S S ER (1684 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC5044-4 1 WFC3/UVI ACCUM UVIS-CEN F300X 1 none none none 1 869.0 S S TER NGC5044-4 1 WFC3/UVI ACCUM UVIS-CEN F300X 2 none none none 1 869.0 S S TER NGC5044-4 1 WFC3/UVI ACCUM UVIS-CEN F300X 3 none none none 1 869.0 S S TER NGC5044-4 2 WFC3/UVI ACCUM UVIS-CEN F814W 1 none none none 2 N/A S TER NGC5044-4 2 WFC3/UVI ACCUM UVIS-CEN F814W 2 none none none 2 N/A S TER NGC5044-4 3 WFC3/UVI ACCUM UVIS-CEN F665N 1 none none none 2 N/A S TER NGC5044-4 3 WFC3/UVI ACCUM UVIS-CEN F665N 2 none none none 2 N/A S TER 15290( 2) - 13-Jul-2017 12:48:55 - [ 7] Summary Form for Proposal 15290 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=4, FLASH=7, FLASH=8, FLASH=9 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2, PATTERN 1 2-3, PATTERN 1 3, PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F300X, F665N, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC5044-1, NGC5044-2, NGC5044-3, NGC5044-4 ------------------------------------------------------------------------------------------------------------------------------------