0 Assigned ID: 198 ----- Attempting Submission 1 (Thu Apr 06 06:06:41 GMT 2017) ----- 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. 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 (Thu Jul 13 19:59:46 GMT 2017) ----- ----- Attempting Submission 2 (Tue May 29 22:23:43 GMT 2018) ----- Checked with support astronomers at STScI to confirm that these (small) offsets are fine for use with the ramp filter. Revealing Thermal Instabilities in the Core of the Phoenix Cluster The Phoenix cluster is the most relaxed cluster known, and hosts the strongest cool core of any cluster yet discovered. At the center of this cluster is a massive starburst galaxy, with a SFR of 500-1000 Msun/yr, seemingly satisfying the early cooling flow predictions, despite the presence of strong AGN feedback from the central supermassive black hole. Here we propose deep narrow-band imaging of the central ~120 kpc of the cluster, to map the warm (10^4K) ionized gas via the [O II] emission line. In low-z clusters, such as Perseus and Abell 1795, the warm, ionized phase is of critical importance to map out thermal instabilities in the hot gas, and maps of Halpha and [O II] have been used for decades to understand how (and how not) cooling proceeds in the intracluster medium. The data proposed for here, combined with deep ALMA data, a recently-approved Large Chandra Program, and recently-approved multi-frequency JVLA data, will allow us to probe the cooling ICM, the cool, filamentary gas, the cold molecular gas, the star-forming population, and the AGN jets all on scales of <10 kpc. This multi-observatory campaign, focusing on the most extreme cooling cluster, will lead to a more complete understanding of how and why thermal instabilities develop in the hot ICM of cool core clusters. Our goal is to obtain a deep, high-angular resolution map of [O II]3726,3729 in the Phoenix cluster over the full cool core area (rcool ~ 150 kpc). This is possible using the ramp filters on ACS, which provide narrow-band filters over the range 3700-10700A. At the redshift of the Phoenix cluster (z = 0.597), [O II] is at 5952A the filter width is 119A. The width of this filter means that we will (easily) obtain both lines in the [O II] doublet, while avoiding any other strong lines. While the Halpha line would be favorable due to the reduced extinction and better comparisons in the literature, we note that this line is redshifted to 1.05um, where the decreased sensitivity (reduced signal) and larger PSF (increased noise in extraction area) leads to exposure times inflated by a factor of >200 to achieve the same depth. We stress that intrinsic extinction at rest-frame 3727A is not a major issue, given that our goal is not to understand the flux of the line, but rather the morphology of the line emitting gas and its correspondence to the cooling ICM, star forming clumps, and radio jets/bubbles. 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. Our goal is to achieve similar depth to the narrow-band Halpha imaging of low-z clusters from McDonald et al. (2010), to allow a fair comparison. We use Abell 1795 as a test case, and require that we will be able to detect the full 50 kpc filament. Our spatial resolution for Abell 1795 was 0.70 kpc (0.6"x1.17"/kpc), which is comparable to the resolution of 0.67 kpc that we will achieve for Phoenix (0.1"x6.7"/kpc). We define two separate sensitivity limits: that we can detect filaments down to the same relative intensity in Phoenix, and that we can detect filaments over the full radial extent for which we see star formation in Phoenix. For the former requirement, we measure the faintest section of the filament in Abell 1795 to contain 0.08% of the total Halpha flux of the system in a single resolution element. Given that the total observed flux in [O II] is 1.7 x10^-14 ergs/s/cm^2 (McDonald et al. 2014), this leads to a limiting depth of 1.36 x 10^-17 ergs/s/cm^2 per resolution element. Per the exposure time calculator (ACS.rf.929661), we can achieve this depth at the 10sigma level in 24,370s, or 8.1 orbits. Thus, if the distribution of cool gas in Phoenix is similar to that in Abell 1795 (with the former having overall more gas), we will achieve the same sensitivity as these low-z observations. As a second requirement, we would like to detect [O II] along the full extent (>100kpc) of the star-forming filaments shown in Figure 2. The faintest UV clumps in this filament have SFR ~ 0.3 Msun/yr, which we choose as our second sensitivity requirement. This corresponds to a limiting [O II] flux of 1.44 x 10^-17 ergs/s/cm^2. We note that neither the UV flux used to derive the limiting SFR or the [O II] flux are extinction corrected, which is fine - we want to achieve the same relative depth, and these are both measured at similar wavelengths (3000A vs 3727A). This limiting flux can be detected at the 10sigma level in 22,229s, or 7.4 orbits (ACS.rf.929680). Given this depth, we expect to, at the very minimum, detect [O II] everywhere there is rest-frame UV emission (Figure 2), and more realistically on larger scales, given that the warm gas is less clumpy than the young stars due to additional, more uniform, sources of ionization. In addition, we require a series of broadband observations in order to subtract continuum emission, which will contribute significantly to the narrow bandpass. The data currently in hand from HST (Figure 2) is significantly affected by cosmic rays, due to overall very short, undithered exposures. Thus, we request two additional orbits each at F475W, F775W, and one at F850LP, which is significantly wider. The first two filters, which span 4031-5489A and 7000-8528A, bracket the narrow band (avoiding overlap) which is centered at 5952A. We request the third redder filter in order to allow rough pixel-by-pixel SED fits using the superposition of an old and young population, allowing a more precise estimate of the continuum level at 5952A. 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. In total, we request 13 orbits of HST ACS, of which 8 will be narrow-band observations with the ramp filter tuned to 5952A, and 5 orbits to constrain the continuum, allowing a deep continuum-free image of the [O II] emission line over the full cluster core. Cosmology Galaxies and the IGM 6 false false false false false false false SUPPORTED GALAXY COOLING FLOW ELLIPTICAL EMISSION LINE NEBULA STARBURST YES J2000 J2000 ACS/WFC RampFilter No No FR601N ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F775W ACS/WFC Imaging No No F850LP POS-TARG DITHER 0.262 LINE 0.192 false false 68.14 4 18.39 ACS-WFC-DITHER-BOX 2 false POS-TARG DITHER 0.262 LINE false false 2 18.39 LINE 3 false Hst Same orient constraint links visits (01 02 03 04 05 06 07 57 58 59) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. 1526674978000 236.83215 (Tic-Visit :proposal-id 15315 :visit-id "01" :proposal-version -1 :trans-version "20180409" :date "29-May-2018 18:22:46.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 568448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15315 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15315 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15315 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3076 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) false 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 57 58 59) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. 1527012771000 236.83215 (Tic-Visit :proposal-id 15315 :visit-id "02" :proposal-version -1 :trans-version "20180409" :date "29-May-2018 18:22:46.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 568448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15315 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15315 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15315 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3076 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 57 58 59) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. 1527024215000 236.83215 (Tic-Visit :proposal-id 15315 :visit-id "03" :proposal-version -1 :trans-version "20180409" :date "29-May-2018 18:22:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 568448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15315 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15315 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15315 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3076 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 57 58 59) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. 1527098677000 236.83215 (Tic-Visit :proposal-id 15315 :visit-id "04" :proposal-version -1 :trans-version "20180409" :date "29-May-2018 18:22:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 568448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15315 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15315 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2965 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15315 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3076 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 57 58 59) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. 1527110154000 236.83215 (Tic-Visit :proposal-id 15315 :visit-id "05" :proposal-version -1 :trans-version "20180409" :date "29-May-2018 18:22:49.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15315 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15315 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2960 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15315 :visit-id "05" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3076 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 57 58 59) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. 1527184635000 236.83215 (Tic-Visit :proposal-id 15315 :visit-id "06" :proposal-version -1 :trans-version "20180409" :date "29-May-2018 18:22:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15315 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15315 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2960 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15315 :visit-id "06" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3076 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) true 2 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 57 58 59) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. 1526692874000 236.83215 (Tic-Visit :proposal-id 15315 :visit-id "07" :proposal-version -1 :trans-version "20180409" :date "29-May-2018 18:22:51.0" :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 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15315 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15315 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2962 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 57 58 59) The scheduling data was generated by CASM 26.0. CASM was run in Phase II mode. Repeat observation of failed visit 07. 1528060416000 236.83214999999996 (Tic-Visit :proposal-id 15315 :visit-id "57" :proposal-version -1 :trans-version "20180409" :date "29-May-2018 18:22:51.0" :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 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15315 :visit-id "57" :obset-id "57" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15315 :visit-id "57" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2962 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07 57 58 59) The scheduling data was generated by CASM 26.0. 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CASM was run in Phase II mode. /solaris/user1/dctaylor/proposals2/OP-cache/15315-v59.xml Re-observation from failed second orbit of visit 06. 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CASM was run in Phase II mode. /private/var/folders/56/c_jk44c970v8fj73rtx427cm0006v6/T/OPVisit824197692007540388.xml Re-observation of failed second orbit from visit 05. (Tic-Visit :proposal-id 15315 :visit-id "61" :proposal-version -1 :trans-version "20180409" :date "13-Jun-2018 16:32:23.0" :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 568448 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15315 :visit-id "61" :obset-id "61" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15315 :visit-id "61" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2838 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 26.0. 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