0 Assigned ID: 942 ----- Attempting Submission 1 (Fri Apr 07 21:43:44 GMT 2017) ----- Please check the FLASH levels. Thanks! 1274023914 ----- Attempting Submission 1 (Thu Jul 13 03:13:19 GMT 2017) ----- Spectacular optical filaments in the X-ray brightest group cool core 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. 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 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. Galaxies and the IGM 6 false true false false false false SUPPORTED GALAXY COOLING FLOW ELLIPTICAL EMISSION LINE NEBULA FILAMENT STAR FORMING REGION YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY COOLING FLOW ELLIPTICAL EMISSION LINE NEBULA FILAMENT STAR FORMING REGION YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY COOLING FLOW ELLIPTICAL EMISSION LINE NEBULA FILAMENT STAR FORMING REGION YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 GALAXY COOLING FLOW ELLIPTICAL EMISSION LINE NEBULA FILAMENT STAR FORMING REGION YES This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 The scheduling data was generated by CASM 24.0. CASM was run in Phase I mode. WFC3/UVIS Imaging No No F665N WFC3/UVIS Imaging No No F300X WFC3/UVIS Imaging No No F814W POS-TARG MOSAIC DITHER 4 2.414 WFC3-UVIS-DITHER-BOX false 81.785 true 0.112 0.173 2 85.759 POS-TARG WFC3-UVIS-GAP-LINE 23.884 1 false POS-TARG MOSAIC DITHER 2 2.4 WFC3-UVIS-MOS-DITH-LINE false true 0.119 3 85.754 POS-TARG WFC3-UVIS-MOS-DITH-LINE 33.606 2 false /home/msun/OP-cache/15290_phaseII-v01.xml The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 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