The nature of star formation in two spectroscopically confirmed exceptionally-luminous galaxies beyond a redshift 7

Assigned ID: 423 ----- Attempting Submission 1 (Fri Feb 24 14:51:18 GMT 2012) ----- HST Phase I Proposal 423 (wfc3_z7_laes.apt) successfully submitted. ----- Attempting Submission 2 (Fri Feb 24 20:20:20 GMT 2012) ----- HST Phase I Proposal 423 (wfc3_z7_laes.apt) successfully submitted. ----- Attempting Submission 3 (Fri Feb 24 23:59:40 GMT 2012) ----- ----- Attempting Submission 1 (Tue Jul 10 02:10:17 GMT 2012) ----- The nature of star formation in two spectroscopically confirmed exceptionally-luminous galaxies beyond a redshift 7 We propose deep WFC3/IR imaging for two very luminous Lyman alpha emitters with Keck spectroscopic redshifts of z=7.213 and 7.308 discovered through large area imaging surveys undertaken with Subaru. We demonstrate that both sources are exceptional in their properties compared to typical Lyman break galaxies being identified at this redshift and deduce that both rare sources are being seen during a special moment in their history. As such their detailed study offers a valuable perspective into the origin of star formation and the physical processes that power the intense line emission. This will complement on-going statistical surveys of star formation during the reionization era. We propose deep broad-band (F125W and F160W) images to improve our understanding of the stellar continuum and, taking advantage of the unique coincidence of Lyman alpha emission at this redshift with the intermediate- band F098M filter, to map the morphological distribution of line emitting gas. The combination will permit us to determine whether the continuum-derived star formation rate is sufficient to power Lyman alpha emission, to robustly estimate the stellar mass and age of both galaxies and, via resolved imaging, to determine the possible role of cold accretion or merging as the origin of the intense activity in these spectacular objects. We will carry out WFC3/IR observations for our bright z=7.3 LAE and z=7.2 LAE with F125W, F160W, and F098M filters. For the z=7.3 LAE, we will spend 12 orbits: 4 orbits with each of the three filters. The 12-orbit observation is composed of 6 visits that consist of 2 orbits. For the z=7.2 LAE, we will spend 4 orbits: 1 orbit with F125W and F160W, and 2 orbits with F098M filter. The 4-orbit observation is composed of 2 visits that consist of 2 orbits. Because we aim to obtain deep images with a good PSF resampling, we perform 1 band, or 2 bands at most, observations in one visit with 4-point dither of WFC3-IR-DITHER-BOX-MIN. This strategy will accomplish subpixel sampling accurately. In addition, if we observe a target with a filter spending 4 orbits, we will use large POS-TARG offsets to enable rejection of hot/bad pixels coming in clumps. The pattern is (0,0), (+1.355,+0.424), (+0.881,+1.212), and (-0.474,+0.787) in arcsec, corresponding to (0,0), (+10.0,+3.5), (+6.5,+10.0), (-3.5,+6.5) in pixel, respectively. Although any visit orientations can be taken, but all of our visits for each target should have the same visit orientation to realize a good subpixel sampling. We have chosen SPARS25 for F125W and F160W bands and SPARS50 for F098M band, following the WFC3 instrument handbook. To avoid over runs of orbit visibility, NSAMP is not 15, but 12-13. COSMOLOGY 12 false 0.0 0.0 false false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY redshift(Lya) = 7.308 J2000 J2000 J > 24.94 ABmag (UKIDSS-UDS 2sigma) GALAXY HIGH REDSHIFT GALAXY redshift(Lya) = 7.213 J2000 J2000 F140W = 25.17 +/- 0.07 ABmag WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F098M WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F098M POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1

false

1341548735589 /Users/ono/Documents/Astros/2012/proposals/HSTcycle20Phase2/OP-cache/wfc3_z7_laes-v01.xml Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. F125W x 2 orbits for Z73-BRIGHT-LAE (Tic-Visit :proposal-id 12960 :visit-id "01" :proposal-version -1 :trans-version "20120604" :date "06-Jul-2012 13:25:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3830016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12960 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12960 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2636 :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 3015 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12960 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2736 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3015 :pcs-gap 0 ) true 2 0 1341548740283 /Users/ono/Documents/Astros/2012/proposals/HSTcycle20Phase2/OP-cache/wfc3_z7_laes-v02.xml Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. F125W x 2 orbits for Z73-BRIGHT-LAE (Tic-Visit :proposal-id 12960 :visit-id "02" :proposal-version -1 :trans-version "20120604" :date "06-Jul-2012 13:25:39.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3830016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12960 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12960 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2636 :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 3015 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12960 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2736 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3015 :pcs-gap 0 ) true 2 0 1341548745200 /Users/ono/Documents/Astros/2012/proposals/HSTcycle20Phase2/OP-cache/wfc3_z7_laes-v03.xml Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. F160W x 2 orbits for Z73-BRIGHT-LAE (Tic-Visit :proposal-id 12960 :visit-id "03" :proposal-version -1 :trans-version "20120604" :date "06-Jul-2012 13:25:44.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3830016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12960 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12960 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2636 :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 3015 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12960 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2736 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3015 :pcs-gap 0 ) true 2 0 1341548751221 /Users/ono/Documents/Astros/2012/proposals/HSTcycle20Phase2/OP-cache/wfc3_z7_laes-v04.xml Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. F160W x 2 orbits for Z73-BRIGHT-LAE (Tic-Visit :proposal-id 12960 :visit-id "04" :proposal-version -1 :trans-version "20120604" :date "06-Jul-2012 13:25:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3830016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12960 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12960 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2636 :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 3015 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12960 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2736 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3015 :pcs-gap 0 ) true 2 0 1341548754086 /Users/ono/Documents/Astros/2012/proposals/HSTcycle20Phase2/OP-cache/wfc3_z7_laes-v05.xml Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. F098M x 2 orbits for Z73-BRIGHT-LAE (Tic-Visit :proposal-id 12960 :visit-id "05" :proposal-version -1 :trans-version "20120604" :date "06-Jul-2012 13:25:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1949792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12960 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12960 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :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 3015 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12960 :visit-id "05" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 310 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3015 :pcs-gap 0 ) true 2 0 1341548756840 /Users/ono/Documents/Astros/2012/proposals/HSTcycle20Phase2/OP-cache/wfc3_z7_laes-v06.xml Same orient constraint links visits (01 02 03 04 05 06) The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. F098M x 2 orbits for Z73-BRIGHT-LAE (Tic-Visit :proposal-id 12960 :visit-id "06" :proposal-version -1 :trans-version "20120604" :date "06-Jul-2012 13:25:56.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1949792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12960 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12960 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :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 3015 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12960 :visit-id "06" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 310 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3015 :pcs-gap 0 ) true 2 0 1341548761457 /Users/ono/Documents/Astros/2012/proposals/HSTcycle20Phase2/OP-cache/wfc3_z7_laes-v07.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. F125W x 1 orbit + F160W x 1 orbit for Z72-BRIGHT-LAE (Tic-Visit :proposal-id 12960 :visit-id "07" :proposal-version -1 :trans-version "20120604" :date "06-Jul-2012 13:26:00.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3830016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12960 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12960 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2636 :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 3050 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12960 :visit-id "07" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2736 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3050 :pcs-gap 0 ) true 2 0 1341548764308 /Users/ono/Documents/Astros/2012/proposals/HSTcycle20Phase2/OP-cache/wfc3_z7_laes-v08.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. F098M x 2 orbits for Z72-BRIGHT-LAE (Tic-Visit :proposal-id 12960 :visit-id "08" :proposal-version -1 :trans-version "20120604" :date "06-Jul-2012 13:26:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1949792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12960 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12960 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :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 3050 :pcs-gap 0 ) (Tic-Orbit :proposal-id 12960 :visit-id "08" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 310 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3050 :pcs-gap 0 ) true 2 0