0 Assigned ID: 751 ----- Attempting Submission 1 (Fri Feb 24 21:45:54 GMT 2012) ----- 0 ----- Attempting Submission 1 (Tue Jul 10 15:07:18 GMT 2012) ----- ----- Attempting Submission 2 (Wed Jun 12 18:25:59 GMT 2013) ----- ----- Attempting Submission 3 (Fri Jun 14 14:42:58 GMT 2013) ----- ----- Attempting Submission 4 (Mon Aug 19 13:30:51 GMT 2013) ----- Testing the Cold Stream Accretion Model Using Lyman Alpha Blobs We propose to use WFC3/F502N narrowband imaging to search for filamentary/stream structures within Ly-alpha blobs in the SSA22 proto-cluster of these objects at z=3.1. It has been suggested that these giant Ly-alpha emission line nebulae (typical sizes of ~100kpc) are massive galaxies onto which ''cold gas streams'' are being accreted. In this scenario, filamentary streams of Ly-alpha emission should be seen. The detailed morphology of the Ly-alpha-emitting gas has never been observed due to a lack of spatial resolution in ground-based imaging observations. By exploiting a narrowband filter that fortuitously coincides with Ly-alpha emission at the proto-cluster redshift, we can obtain deep, narrowband imaging at sufficient resolution for 5 Ly-alpha blobs and ~4 compact emitters in a single pointing. These data will allow us to spatially resolve the predicted streams and thereby confirm or disprove the cold mode accretion scenario for these most promising candidates for gas-accreting galaxies at high redshift. Furthermore, the proposed observations will provide the first direct constraints on theoretical models that explore the observational signatures of gas flows (in or out), which are vital to our understanding of galaxy formation and evolution. This proposal aims to study the detailed morphology of Ly-alpha emission around the two brightest Lyman alpha blobs (LABs) and look for filamentary/stream substructures of Ly-alpha-emitting gas. --------------------- General Information --------------------- 1. We request to observe the extended Lyman alpha emission with WFC3/UVIS + F502N narrowband filter (total 18 orbits). 2. We request to observe the embedded galaxies with WFC3/UVIS + F625W broadband filter to trace their UV continuum (2 orbits). --------------------- Special Requests --------------------- There are two special requests in our program as follows, and all of them were requested and approved in the phase 1 proposal. 1. ORIENT Constraint: The camera has to be oriented as requested, so that all the sources of interest will be imaged simultaneously. Two main sources are located at the corner of each chip diagonally. While we requested a stringent ORIENT constraint with Delta_PA ~ 20 degrees in the phase 1 proposal, we found that fixing roll angle to a certain value (here roll angle = 74 or 254 degree) do not affect the schedulability in the Visit planner, so we set the ORIENT requirement to these two values. 2. LOW-SKY: Because our target is very faint, we request low-sky constraint to minimize the sky background. This will reduce the visibility slightly, its effect should be minimal. 3. Post-flash In order to mitigate the CTE issue, we use the post-flash of 12e- for the F502N narrowband observations. Originally, we considered to use 3x3 binning, but we decided to use no binning and post-flash after consulting the instrument scientists in STScI. --------------------- Visits & Orbits --------------------- We split our allocated orbits into 6 visits each with 2 or 4 orbits. In F502N narrowband observations, we do not dither during a visit (4 orbits) to accumulate the signal into the same pixels, but apply small offsets (using POS TARG, +- 0.16 or 0.08 arcsec) between the visits. # Summary: setup = 1x1 binning, ORIENT, LOW-SKY visit1 : 4 orbits = 3 x F502N + 1 x F625W visit2 : 4 orbits = 3 x F502N + 1 x F625W visit3 : 4 orbits = 4 x F502N visit4 : 4 orbits = 4 x F502N visit5 : 4 orbits = 4 x F502N N/A N/A Coordinated parallel observations: 1. We attached parallel ACS/G800L-grism observations for the primary F502N narrowband imaging (18 orbits). For each visit, we obtain only one or two direct images (F606W) to obtain zero point of grism data. Due to long exposure times (1 exposure per orbit) in both primary and parallel observations, there is no issues related to buffer dumps. 2. But we did not attached any parallel observation for the primary F625W broadband imaging (2 orbits) because of the limitations on buffer dumps (there are already three readouts with dithering). UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE 12 false false 0.0 0.0 false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY LYMAN ALPHA CLOUD J2000 J2000 Flux(Lyman-alpha) ~ 1e-16 erg/s/cm^2 WFC3/UVIS Imaging No No F502N WFC3/UVIS Imaging No No F625W POS-TARG DITHER 0.135 LINE false true 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 1 false /tmp/OPVisit3772075372054440867.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12943 :visit-id "01" :proposal-version -1 :trans-version "20130502" :date "19-Aug-2013 15:29:47.0" :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 2869360 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12943 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12943 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2744 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2814 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) true 4 0 /tmp/OPVisit7326249109116844323.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12943 :visit-id "02" :proposal-version -1 :trans-version "20130502" :date "19-Aug-2013 15:29:50.0" :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 2869360 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12943 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12943 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2744 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "02" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2814 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) true 4 0 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. /tmp/OPVisit1211066935012373220.xml (Tic-Visit :proposal-id 12943 :visit-id "03" :proposal-version -1 :trans-version "20130502" :date "19-Aug-2013 15:29:53.0" :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 2860320 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12943 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12943 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2744 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "03" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "03" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) true 4 0 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. /tmp/OPVisit4830799400938204169.xml (Tic-Visit :proposal-id 12943 :visit-id "04" :proposal-version -1 :trans-version "20130502" :date "19-Aug-2013 15:29:56.0" :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 2860320 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12943 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12943 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2744 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "04" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "04" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) true 4 0 The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. /tmp/OPVisit8374855537897643018.xml (Tic-Visit :proposal-id 12943 :visit-id "05" :proposal-version -1 :trans-version "20130502" :date "19-Aug-2013 15:30:00.0" :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 2860320 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12943 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12943 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2744 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "05" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "05" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) (Tic-Orbit :proposal-id 12943 :visit-id "05" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2742 :al-overhead-at-end 123 :internal-dur-at-end 1015 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "Y" :pcs-visibility 3150 :pcs-gap 404 ) true 4 0