0 Assigned ID: 869 ----- Attempting Submission 1 (Fri Apr 11 21:30:07 GMT 2014) ----- POS TARG & PATTERN should be used carefully with ACS ramp or WFC3 quad filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp or WFC3 quad filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp or WFC3 quad filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp or WFC3 quad filters as central wavelengths & transmission efficiencies vary within the apertures. I think it's all good now. Added post-flash, as per suggestion of Norman Grogin. Thanks! Update: changed 2-point pattern to 4-point pattern in the IR visit. 2119958484 ----- Attempting Submission 1 (Wed Jul 09 21:41:22 GMT 2014) ----- HST Phase II Proposal 13681 (go13681.apt) successfully submitted. ----- Attempting Submission 2 (Thu Jul 10 09:12:46 GMT 2014) ----- ----- Attempting Submission 3 (Sat Jul 26 15:40:20 GMT 2014) ----- ----- Attempting Submission 4 (Thu Jul 31 14:01:13 GMT 2014) ----- I think the aperture is correct - but please check ! Fluctuation spectroscopy with the ACS ramp filters: a new way to measure the IMF in elliptical galaxies Images of old stellar populations show pixel-to-pixel fluctuations due to Poisson variations in the number of giant stars. These surface brightness fluctuations can be used to study the spectra of stars as a function of their luminosity, by obtaining differential spectroscopy of pixels with high and low fluctuations. If the average number of stars per pixel is sufficiently low, there will be individual pixels that have almost no light from luminous giants, providing sightlines that are dominated by main sequence stars. In this regime the observed spectral response is strongly dependent on the number of cool, low mass stars, and hence the stellar initial mass function (IMF). We propose to observe the nearest elliptical galaxy, Centaurus A, through four narrowband ACS ramp filters tuned to the 0.8 - 0.9 micron range. From the relation between ACS narrowband indices and the amplitude of the surface brightness fluctuation we will be able to obtain quantitative constraints on the IMF from 0.1-1 Solar masses, and distinguish between a Kroupa-like IMF or a bottom-heavy, Salpeter-like IMF, with ~5 sigma significance. We have demonstrated the feasibility of the technique used in this proposal in a Cycle 19 program, where we used the same observational strategy to measure the properties of luminous giants in the Virgo galaxy NGC 4472. We are observing a single target, a field away from the dust lane in the galaxy Centaurus A (NGC 5128), in 4 ACS ramp filters, in the ACS F814W filter, and in 2 WFC3 IR filters. The aim is that the field is imaged in the RAMP-I aperture for all the ACS filters (including F814W). A standard 4-exposure box dither pattern is used. The F814W exposures are a total of 2 orbits but they are split over 2 visits. This is deliberate: by comparing the 2 F814W visits we will get valuable information on the errors in cosmic ray rejection, centroiding, etc. The data can be taken at any ORIENT but it is crucial that all 7 visits are taken at the same ORIENT. After iterating with Norman Grogin we included a post-flash to the ramp filter observations, with FLASH=25. For the IR filters, we are using a 4-point dither pattern and observe in F125W and F160W in a single orbit. In the initial submission we used a 2-point pattern; after iterating with Knox Long we changed it to 4-point box pattern. There is no need to dither over the 'blob' - it is more important to have small dithers so there are no relative astrometric distortions between exposures, and it is important to have optimal resolution (i.e. sample the PSF properly). UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE Default false false false false false SUPPORTED GALAXY ELLIPTICAL This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 ACS/WFC Imaging No No F814W ACS/WFC RampFilter No No FR853N ACS/WFC RampFilter No No FR853N ACS/WFC RampFilter No No FR853N ACS/WFC RampFilter No No FR853N WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 3 false POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 4 false Hst Same orient constraint links visits (01 02 03 04 05 06 07) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /private/var/folders/7t/dc39bjx923j0fxnrb042tylc0000gn/T/OPVisit4520529529355659912.xml (Tic-Visit :proposal-id 13681 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "31-Jul-2014 09:53:46.0" :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 13681 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13681 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2982 :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 3316 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /private/var/folders/7t/dc39bjx923j0fxnrb042tylc0000gn/T/OPVisit8866823368205812412.xml (Tic-Visit :proposal-id 13681 :visit-id "02" :proposal-version -1 :trans-version "20140605" :date "31-Jul-2014 09:53:47.0" :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 13681 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13681 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2982 :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 3316 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /private/var/folders/7t/dc39bjx923j0fxnrb042tylc0000gn/T/OPVisit3200079955200178577.xml (Tic-Visit :proposal-id 13681 :visit-id "03" :proposal-version -1 :trans-version "20140605" :date "31-Jul-2014 09:53:47.0" :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 13681 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13681 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2982 :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 3316 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /private/var/folders/7t/dc39bjx923j0fxnrb042tylc0000gn/T/OPVisit3390238797902819391.xml (Tic-Visit :proposal-id 13681 :visit-id "04" :proposal-version -1 :trans-version "20140605" :date "31-Jul-2014 09:53:48.0" :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 13681 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13681 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2982 :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 3316 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /private/var/folders/7t/dc39bjx923j0fxnrb042tylc0000gn/T/OPVisit7606221349202259852.xml (Tic-Visit :proposal-id 13681 :visit-id "05" :proposal-version -1 :trans-version "20140605" :date "31-Jul-2014 09:53:49.0" :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 13681 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13681 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2982 :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 3316 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /private/var/folders/7t/dc39bjx923j0fxnrb042tylc0000gn/T/OPVisit2956002331732433732.xml (Tic-Visit :proposal-id 13681 :visit-id "06" :proposal-version -1 :trans-version "20140605" :date "31-Jul-2014 09:53:50.0" :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 13681 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13681 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2982 :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 3316 :pcs-gap 0 ) true 1 0 Hst Same orient constraint links visits (01 02 03 04 05 06 07) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /private/var/folders/7t/dc39bjx923j0fxnrb042tylc0000gn/T/OPVisit4144448121306476554.xml (Tic-Visit :proposal-id 13681 :visit-id "07" :proposal-version -1 :trans-version "20140605" :date "31-Jul-2014 09:58:23.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2089072 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13681 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13681 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2960 :al-overhead-at-end 0 :internal-dur-at-end 652 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3316 :pcs-gap 0 ) true 1 0