This is the first time I have done a phase II. Roadmap, text files and movies were helpful. I think I've done it right but then.... This is a resubmission by Roderick Johnstone on behalf of Andy Fabian. I've removed the CR-SPLIT and added 3-point dither patterns to all the observations as recommended by Andrew Fruchter. ----- Submission 1 (Thu May 05 15:24:32 GMT 2005) ----- Phase II Proposal 10546 (aptaftervp) successfully submitted. ----- Submission 2 (Wed Jul 27 13:11:42 GMT 2005) ----- Assigned ID: 729 ----- Submission 1 (Mon Jan 24 15:21:02 GMT 2005) ----- The filaments of NGC1275 The spectacular H-0alpha filaments stretching over 100 kpc around the central galaxy in the nearby Perseus cluster of galaxies, NGC1275, resemble those found around distant radio galaxies and some protogalaxies. The origin and ionization of the filaments are poorly understood and relate to heating and cooling processes in galaxy formation and evolution. We propose here to image the filaments in order to reveal their true small-scale structure and to search for clumps of young stars along them. The observations will produce the first deep high resolution images of the whole filament system and, with our 1 Ms Chandra image, constrain both particle and photon ionization models for its ionization and excitation.
We propose to observe NGC1275 and its surroundings in 3 filters, F550M (mostly line free), F625W (includes \halpha) and F435W (includes [OII] and provides blue photometry of star clusters), targetting 4 positions (the corners of a rectangle of width 1 arcmin and depth 1.33 arcmin) with substantial overlap. This way we observe the central 3 arcmin wide region deeply and also cover the outer arcmin in the search for weak filaments. The brightest filaments have an \halpha\ surface brightness of a few times $10^{-15}$~erg~s$^{-1}$~cm$^{-2}$~arcsec$^{-2}$ (Conselice et al 2001). We intend to go to a fraction of this flux on subarcsec scales. For an extended emission-line source with $3\times 10^{-16}$~erg~s$^{-1}$~cm$^{-2}$~arcsec$^{-2}$ to reach $S/N = 5$ in a 2x2 pixel region (0.1x0.1 arcsec) takes $\sim24$~ks for F625W. A star cluster, comparable to the brighter ones detected, with $10^6$~M$_{\sun}$ has abs. $V = -12.25$ and $-10.52$ after 100 Myrs and a Gyr. To detect these will take 24 s -- 160 s in F625W and 42 s -- 300 s in F435W to a $S/N\sim20$. $10^4$~M$_{\sun}$ clusters will have magnitudes 5 times fainter, which will require a minimum of $\sim2500$~s. $V = 27$ is reached with an A star spectrum and $S/N = 10$ in 4000s. This gives an absolute magnitude limit of $-7.4$, in which we could detect $10^4$~M$_{\sun}$ star clusters that are 100 Myrs old to 5 sigma. For ionization of the gas we require massive young stars, which may have a more patchy distribution than older A stars. We shall search for a statistical excess of sources along the filaments. Therefore, the known filaments and possible large star clusters will be detected straightforwardly (see Figs. 1 and 2 and discussion in Duplication justification section for a demonstration from existing images). Fine-scale detail will be resolved in the filaments and we will be sensitive to smaller star clusters. With the better efficiency of ACS and the multiple coverage of the inner regions (21.6~ks per filter where they overlap) our proposed signal should be 10 times better than the existing WFPC2 data (Figs 1 and 2). We request 5400~s (2 orbits) for each of the 4 pointings in each of three filters, totalling 24 orbits. We have assumed here about 15 min per orbit for guide star, pointing and `cosmic ray split' times, leaving about 2700~s per HST orbit. COSMOLOGY 12 false 0 0.0 false 0 false false false false SUPPORTED CLUSTER OF GALAXIES COOLING FLOW FILAMENT EMISSION LINE NEBULA J2000 03 19 45.3000 +41 32 0.00 J2000 CLUSTER OF GALAXIES COOLING FLOW EMISSION LINE NEBULA FILAMENT J2000 03 19 45.3000 +41 30 40.00 J2000 CLUSTER OF GALAXIES COOLING FLOW EMISSION LINE NEBULA FILAMENT J2000 03 19 50.5000 +41 23 0.00 J2000 CLUSTER OF GALAXIES COOLING FLOW EMISSION LINE NEBULA FILAMENT J2000 03 19 50.5000 +41 30 40.00 J2000 ACS/WFC Imaging No No F435W ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F550M ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F625W ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F435W ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F550M ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F625W ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F435W ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F550M ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F625W ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F435W ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F550M ACS/WFC Imaging No No CLEAR1L ACS/WFC Imaging No No F625W ACS/WFC Imaging No No CLEAR1L POS-TARG DITHER 3.011 LINE false false 3 85.28 ACS-WFC-DITHER-LINE 1 false /data/acf/proposals/hst/phaseii/OP-cache/rmj-v01.xml (Tic-Visit :proposal-id 10546 :visit-id "01" :proposal-version -1 :trans-version "20050323" :date "27-Jul-2005 13:04:14.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 6 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 5116032 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10546 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10546 :visit-id "01" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2983 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "01" :orbit-number 2 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "01" :orbit-number 3 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "01" :orbit-number 4 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "01" :orbit-number 5 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "01" :orbit-number 6 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) true 6 0 /data/acf/proposals/hst/phaseii/rmj/OP-cache/rmj-v01.xml /data/acf/proposals/hst/phaseii/OP-cache/rmj-v02.xml (Tic-Visit :proposal-id 10546 :visit-id "02" :proposal-version -1 :trans-version "20050323" :date "27-Jul-2005 13:42:49.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 6 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 5116032 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10546 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10546 :visit-id "02" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2983 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "02" :orbit-number 2 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "02" :orbit-number 3 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "02" :orbit-number 4 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "02" :orbit-number 5 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "02" :orbit-number 6 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) true 6 0 /data/acf/proposals/hst/phaseii/rmj/OP-cache/rmj-v02.xml /data/acf/proposals/hst/phaseii/OP-cache/rmj-v03.xml (Tic-Visit :proposal-id 10546 :visit-id "03" :proposal-version -1 :trans-version "20050323" :date "27-Jul-2005 13:43:38.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 6 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 5116032 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10546 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10546 :visit-id "03" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2983 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "03" :orbit-number 2 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "03" :orbit-number 3 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "03" :orbit-number 4 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "03" :orbit-number 5 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "03" :orbit-number 6 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) true 6 0 /tmp/OPVisit29157.xml /data/acf/proposals/hst/phaseii/OP-cache/rmj-v04.xml (Tic-Visit :proposal-id 10546 :visit-id "04" :proposal-version -1 :trans-version "20050323" :date "27-Jul-2005 13:44:32.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 6 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 5116032 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10546 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10546 :visit-id "04" :orbit-number 1 :pcs-time 367 :si-vis-utilization 2983 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "04" :orbit-number 2 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "04" :orbit-number 3 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "04" :orbit-number 4 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "04" :orbit-number 5 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10546 :visit-id "04" :orbit-number 6 :pcs-time 367 :si-vis-utilization 2982 :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 3351 :pcs-gap 0 ) true 6 0 /tmp/OPVisit29160.xml