STUDYING AGN FEEDING AND FEEDBACK IN THE MOST QUENCHED COOL CORE CLUSTER

Science Keywords: Select from 2 to 5 items. Science Keywords is a required field. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. 0 Assigned ID: 1048 ----- Attempting Submission 1 (Fri Aug 09 11:36:11 GMT 2019) ----- HST Phase I Proposal 1048 (Gitti.apt) successfully submitted. Receipt: # 1048-1 Joint Chandra/HST POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. 0 ----- Attempting Submission 1 (Tue Sep 17 14:02:15 GMT 2019) ----- HST Phase II Proposal 16001 (phase2.apt) successfully submitted. Receipt: # 16001-1 ----- Attempting Submission 2 (Fri Sep 20 17:13:47 GMT 2019) ----- Dithers are all very small and should not be a problem with ramp filter. STUDYING AGN FEEDING AND FEEDBACK IN THE MOST QUENCHED COOL CORE CLUSTER We propose the parallel study of two systems that are almost identical in ICM and feedback properties, but differ by a factor of ~100 in SFR. With a SFR of ~0.1% of the classical cooling rate, RBS 797 may be the most quenched cool core cluster, making it the best place to study the effectiveness of AGN feedback. The jets in RBS 797 appear to have recently reoriented by 90 degrees over multiple AGN outbursts. We argue that precessing jets can lead to more isotropic heating, leading to maximally suppressed cooling. The requested high quality Chandra and narrow-band HST data of RBS 797 will allow us to examine in detail how AGN feedback in RBS 797 is more successfully coupling to the ICM, and potentially provide critical clues to the ultimate solution of the cooling flow problem. Our goal is to obtain deep, high-angular resolution maps of [O II]3726,3729 for the central galaxy in RBS797, following in methodology from HST Proposals 15315 and 15661. This is possible using the ramp filters on ACS, which provide narrow-band filters over the range 3700-10700A. At the redshift of our target the filter width is ~120A. The width of this filter means that we will (easily) obtain both lines in the [O II] doublet, while avoiding any other strong lines. Given the inherent challenge in flux calibrating and flat fielding HST ramp filter data, achieving a reliable flux map would be challenging even with perfect knowledge of the intrinsic extinction. In addition, we require broadband observations in order to subtract continuum emission, which will contribute significantly to the narrow bandpass. These two filters have been chosen for each galaxy to bracket the 4000A break and avoid emission from Balmer lines and [O III] (5007A). These broadband filters are a factor of ~10x wider than the narrow-band filter, providing similar sensitivity to the continuum in a single orbit as we achieve over 8 exposures in the narrow band. Combining the two bands bracketing the [OII] line, we will have a factor of 5x deeper exposure in the continuum, compared to the narrow-band exposure. Without these deep continuum images, we would add significant amounts of noise during the continuum-subtraction procedure, reducing the effective depth of our narrow-band images. None Required Galaxies and the IGM 6 false false false false false false false SUPPORTED CLUSTER OF GALAXIES COOLING FLOW EMISSION LINE NEBULA RICH CLUSTER This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 ACS/WFC RampFilter No No FR505N ACS/WFC Imaging No No F435W POS-TARG DITHER 0.262 LINE 0.192 false false 68.14 4 18.39 ACS-WFC-DITHER-BOX 2

false

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