Low-sky now included for all targets, with corrected exposure times. -2006585266 ----- Attempting Submission 3 (Fri Aug 10 22:48:07 GMT 2012) ----- Beth (CP) assures warnings/errors do not pose real issues. Direct Confirmation of Intracluster Stars as SN Ia Progenitors To help resolve the progenitor problem for Type Ia supernovae (SNe Ia) and ensure their dependability as cosmological standard candles, we seek direct confirmation that SNe Ia explode in >2 Gyr old stellar populations. The Multi-Epoch Nearby Cluster Survey (MENeaCS) monitored 60 low redshift, rich galaxy clusters for two years, and spectroscopically confirmed four apparently hostless cluster SNe Ia. The intracluster medium hosts a purer population of old stars than elliptical galaxies, which have been shown to often harbor low levels of star formation. We propose to obtain deep HST images at the locations of these four SNe Ia (now faded), to confirm that they are truly associated with the population of intracluster stars, and not hosted by a faint cluster galaxy or globular cluster. This proposal will also provide the necessary support for the use of IC SNe - as bright representatives of IC stars - in determining the fraction of IC stellar mass and light, which has low surface brightness and is difficult to measure directly. The required observations are only possible with HST, which has both the necessary resolution to limit contamination from background sources, and the sensitivity to detect or rule out the presence of a faint cluster galaxy or globular cluster at the SNe Ia locations. We have now been authorized to obtain parallel observations with WFC3. We use the same filters and the same exposure times as our ACS images. This data will provide additional cluster faint source number counts for our statistical analysis of any detection at our targeted coordinates, and contribute to our auxiliary science goals. We will obtain deep images, V=28.2 to 28.9 (F606W) and I=27.2 to 27.9 (F814W), for each of our four targets with the Advanced Camera for Surveys. Our four targets are the locations of apparently hostless Type Ia supernovae (SNeIa) in the central regions of rich galaxy clusters. The SNeIa have now faded so these observations will either detect a faint host, or confirm the SNeIa's association with the intracluster stellar population. Telescope orientations have been chosen to avoid possible star diffraction spikes from coming within 50-200 pixels of our target coordinates (tolerance depends on star magnitude). Total required integration times are divided into multiple exposures to avoid cosmic rays, and dithered to avoid possible hot pixels. Aperture "WFC1" was chosen as the target position on the CCD because amplifier "B" on WFC1 has the lowest read noise. We have been authorized to include parallel observations with WFC3. These have been set to the same filters and exposure times of our ACS observations. The orientations have been further constrained so that WFC3 will be closer to the clusters' centers than ACS. HOT STARS 12 false false 0.0 0.0 false false false SUPPORTED CLUSTER OF GALAXIES RICH CLUSTER J2000 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 J2000 CLUSTER OF GALAXIES RICH CLUSTER J2000 J2000 ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F814W POS-TARG DITHER 2 The intent is to simply have small scale dithers; we do not need to fill in the gap. LINE false false 2 45 LINE 1 false POS-TARG DITHER 2 LINE false false 3 45 LINE 2 false The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Use of LOW-SKY suggested by HST staff (was not in our Phase I). Orientations set to avoid nearby very bright stars being aligned along x or y axis with target coordinates. Orientations then further constrained to put WFC3 closer to the cluster center than ACS. 1359122344000 269.0 (Tic-Visit :proposal-id 12937 :visit-id "01" :proposal-version -1 :trans-version "20120604" :date "10-Aug-2012 15:43:41.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 8594560 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12937 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12937 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2408 :al-overhead-at-end 70 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 2773 :pcs-gap 167 ) (Tic-Orbit :proposal-id 12937 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2528 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 2773 :pcs-gap 167 ) (Tic-Orbit :proposal-id 12937 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2523 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 2773 :pcs-gap 167 ) (Tic-Orbit :proposal-id 12937 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2498 :al-overhead-at-end 0 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 2773 :pcs-gap 167 ) (Tic-Orbit :proposal-id 12937 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2528 :al-overhead-at-end 0 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 2773 :pcs-gap 167 ) true 5 0 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Use of LOW-SKY suggested by HST staff (was not in our Phase I). Orientations set to avoid nearby stars being aligned along x or y axis with target coordinates. We found that further constraints to force WFC3 closer to the cluster center than ACS (as done for other visits) resulted in just a 16 day range in the Visit Planner, so we have not included these constraints for this target. Instead, we impose additional orientation contraints to force a nearby cluster galaxy onto ACS-WFC2. This will be scientifically useful and still allows for a wide time span for scheduling. 1380892051000 100.90319412065003 (Tic-Visit :proposal-id 12937 :visit-id "02" :proposal-version -1 :trans-version "20120604" :date "10-Aug-2012 15:43:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 6875696 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12937 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12937 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2772 :al-overhead-at-end 20 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 12937 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2723 :al-overhead-at-end 40 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 12937 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2744 :al-overhead-at-end 20 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) (Tic-Orbit :proposal-id 12937 :visit-id "02" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2754 :al-overhead-at-end 30 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3178 :pcs-gap 400 ) true 4 0 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Use of LOW-SKY suggested by HST staff (was not in our Phase I). Orientations set to keep nearby bright stars out of the field of view. Orientations then further constrained to put WFC3 closer to the cluster center than ACS. 1386133525000 54.94218099944561 (Tic-Visit :proposal-id 12937 :visit-id "03" :proposal-version -1 :trans-version "20120604" :date "10-Aug-2012 15:43:55.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 3437840 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12937 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12937 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2426 :al-overhead-at-end 90 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 2764 :pcs-gap 179 ) (Tic-Orbit :proposal-id 12937 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2537 :al-overhead-at-end 60 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 2764 :pcs-gap 179 ) true 2 0 The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. Use of LOW-SKY suggested by HST staff (was not in our Phase I). Orientations set to avoid nearby stars being aligned along x or y axis with target coordinates. Orientations then further constrained to put WFC3 closer to the cluster center than ACS. 1379526136000 298.0 (Tic-Visit :proposal-id 12937 :visit-id "04" :proposal-version -1 :trans-version "20120604" :date "10-Aug-2012 15:43:59.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 3437824 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12937 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12937 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2408 :al-overhead-at-end 50 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 2769 :pcs-gap 175 ) (Tic-Orbit :proposal-id 12937 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2538 :al-overhead-at-end 15 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 2769 :pcs-gap 175 ) true 2 0 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. C:\Users\Bill Januszewski\AppData\Local\Temp\OPVisit7419824366217144593.xml Use of LOW-SKY suggested by HST staff (was not in our Phase I). Orientations set to avoid nearby stars being aligned along x or y axis with target coordinates. Orientations then further constrained to put WFC3 closer to the cluster center than ACS. This is a repeat of the second orbit of visit 04. (Tic-Visit :proposal-id 12937 :visit-id "05" :proposal-version -1 :trans-version "20130919" :date "13-Dec-2013 06:47:05.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 40.0 :data-volume 1718912 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12937 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12937 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2408 :al-overhead-at-end 0 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 2769 :pcs-gap 175 ) false 1 0