Assigned ID: 584 ----- Attempting Submission 1 (Fri Feb 26 20:32:08 GMT 2010) ----- HST Phase I Proposal 584 (sq_apt) successfully submitted. ----- Attempting Submission 2 (Fri Feb 26 21:00:24 GMT 2010) ----- I was wondering if it would be better to do 2 longer exposures per orbit rather than three exposures that we have now. ----- Attempting Submission 1 (Tue Jul 06 17:01:28 GMT 2010) ----- HST Phase II Proposal 12301 (phaseII_kf.apt) successfully submitted. ----- Attempting Submission 3 (Wed Oct 06 17:11:17 GMT 2010) ----- Precision Age-Dating of Star Clusters in Stephan's Quintet The compact galaxy group Stephan's Quintet, showcased in the Early Release Observations of the newly refurbished Hubble, has experienced a complex series of gravitational interactions culminating in a ~50 kpc-long strong shock from the intruder NGC 7318B ploughing into NGC 7318A and the intragroup medium. Each major event within the past 500 Myrs has triggered star formation as demonstrated by the populations of massive star clusters present. Within this single system, we have the opportunity to study star-formation in novel settings not otherwise accessible in the nearby universe. We propose to make the most of this chance by supplementing the multi-color WFC3 images of Stephan's Quintet with 8 additional orbits of WFC3 imaging to obtain critical F336W (necessary for breaking the age-reddening degeneracy) and F547M (replacing F606W observations that are badly polluted by strong emission lines) observations. The combination of broad and narrow-band photometry will enable unprecedented precision in obtaining ages and masses for the <500 Myr-old star clusters within this system. With this information in hand, these clusters can be used as tracers of the gross galaxy interactions over time, and probes of the physics of star formation within the large-scale shock in particular.
We plan to have 6 orbits with F336W filter and 2 orbits with F547M filter. For each orbit we use WFC3-UVIS-MOS-DITH-LINE pattern (with 3 point secondary pattern for dithering separated by 0.119 arcsec), which will provide good sampling of the PSF, as well as minimize the readout noise. In the first visit, which consists of 5 orbits (all with F336W filter), we use 5 primary dither pointings. Each primary point is separated by 2.4 arcsec in order to cover the gap between the CCDs. In the second visit we have one orbit with F336W filter and 2 orbits with F547M filter. For the first orbit of the second visit we use WFC3-UVIS-MOS-DITH-LINE pattern with 3 point primary pattern separated by 2.4 arcsec in order to cover the interchip gap but no secondary pattern. For the last two orbits we use same pattern with 3 secondary dither pointings separated by 0.119 arcsec and 2 primary pointings, with the same separation as before. UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE 12 false 0.0 0.0 false false false false false false SUPPORTED STELLAR CLUSTER SHOCK FRONT STAR FORMING REGION TIDAL TAIL YOUNG ASSOCIATION This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 22 35 57.5000 +33 57 56.00 J2000 WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F547M POS-TARG DITHER DITHER 2 2.4 WFC3-UVIS-MOS-DITH-LINE false true 0.119 2 85.754 POS-TARG WFC3-UVIS-MOS-DITH-LINE 33.606 1 false POS-TARG MOSAIC DITHER 2 2.4 WFC3-UVIS-MOS-DITH-LINE false true 0.119 5 85.754 POS-TARG WFC3-UVIS-MOS-DITH-LINE 33.606 3 true POS-TARG MOSAIC DITHER 2 2.4 WFC3-UVIS-MOS-DITH-LINE false true 0.119 2 85.754 POS-TARG WFC3-UVIS-MOS-DITH-LINE 33.606 4 true /home/kfedotov/Work/Proposal/HST/Cycle18/OP-cache/phaseII_kf-v01.xml The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 5 orbits U(336) band (Tic-Visit :proposal-id 12301 :visit-id "01" :proposal-version -1 :trans-version "20100505" :date "04-Oct-2010 12:08:36.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 2887440 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12301 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12301 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2942 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12301 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3053 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12301 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3053 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12301 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3053 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12301 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3053 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 5 0 /home/kfedotov/Work/Proposal/HST/Cycle18/OP-cache/phaseII_kf-v02.xml The scheduling data was generated by CASM 18.3.1. CASM was run in Phase II mode. 3 orbits: 1 of U(336) + 2 of V(547) band (Tic-Visit :proposal-id 12301 :visit-id "02" :proposal-version -1 :trans-version "20100505" :date "04-Oct-2010 12:09:00.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12301 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12301 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2942 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12301 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3053 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12301 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3053 :al-overhead-at-end 116 :internal-dur-at-end 670 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3275 :pcs-gap 0 ) true 3 0