----- Attempting Submission 2 (Sun Oct 16 03:29:01 GMT 2011) ----- A Chandra Legacy Project to Resolve the Accretion Flow of Gas Captured by a Supermassive Black Hole We propose a 1 Msec observation of the hot gas around the supermassive black hole at the center of the nearby S0 galaxy NGC3115 in order to place the first direct observational constraints on the temperature and density structure of an accretion flow inside the Bondi radius of a black hole. These temperature/density constraints will provide a critical test for competing inefficient accretion flow theories. The large angular Bondi radius of this black hole provides the *only* opportunity to perform such a test of inefficient accretion flow theory in the Chandra era and the foreseeable future. An additional benefit of this long observation is that it will also provide the deepest look of the X-ray binary population of a normal early-type galaxy to date.
The primary observations with ACS/WFC are designed for photometry in F475W and F850LP of globular clusters in the massive S0 galaxy NGC 3115. These observations complement extremely deep Chandra imaging and the goal is to cross-match X-ray sources with HST-identified clusters (a secondary goal is to match X-ray sources with background galaxies, to help isolate field sources with no counterparts). The use of two filters gives color information used to estimate rough metallicities of the clusters. Depending on the filter, we use two or three exposures and a simple line dither to cover the chip gap and correct pixel-level defects and cosmic rays. Given 54 min of visibility per orbit, about 33 min are available after overheads for science exposures. Exposure times of 820 sec in F475W and 1170 sec in F850LP give approximately equal signal-to-noise in the two bands. For one pointing covering the galaxy nucleus, we take a short exposure in F850LP because of the possibility of saturation in the center. NGC 3115 has no archival ACS data. The six pointings in this proposals are arranged in a mosaic, stretched to maximizing joint coverage of the galaxy and the Chandra ACIS FOV chip. The need to match the Chandra data leads to the restrictive orientation requirements. 12 false 0.0 0.0 false false false false SUPPORTED GALAXY LENTICULAR J2000 J2000 GALAXY LENTICULAR J2000 J2000 GALAXY LENTICULAR J2000 J2000 GALAXY LENTICULAR J2000 J2000 GALAXY LENTICULAR J2000 J2000 GALAXY LENTICULAR J2000 J2000 ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F850LP POS-TARG DITHER 3.011 LINE false false 2 85.28 ACS-WFC-DITHER-LINE 4 false POS-TARG DITHER 3.011 LINE false false 3 85.28 ACS-WFC-DITHER-LINE 5 false Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. /private/var/folders/82/jv95r39935d7gk3n5mvlb7fc0000gn/T/OPVisit3474665616770508851.xml (Tic-Visit :proposal-id 12759 :visit-id "01" :proposal-version -1 :trans-version "20110811" :date "15-Oct-2011 23:26:00.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1421120 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12759 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12759 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3242 :pcs-gap 0 ) true 1 0 Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 19.3. 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