Assigned ID: 749 ----- Attempting Submission 1 (Fri Feb 25 23:00:14 GMT 2011) ----- I am submitting on behalf of the PI: Chris Carilli Jean-Paul Kneib ----- Attempting Submission 1 (Wed Jun 29 15:11:55 GMT 2011) ----- HST Phase II Proposal 12480 (mm1842_v3.apt) successfully submitted. ----- Attempting Submission 2 (Wed Jun 29 15:12:29 GMT 2011) ----- HST Phase II Proposal 12480 (mm1842_v3.apt) successfully submitted. ----- Attempting Submission 3 (Wed Jun 29 15:12:54 GMT 2011) ----- HST Phase II Proposal 12480 (mm1842_v3.apt) successfully submitted. ----- Attempting Submission 4 (Wed Jun 29 15:13:10 GMT 2011) ----- We propose a single orbit exposure of the strongly lensed submm galaxy (SMG), MM18423+5938, using WFC3 110W. MM1842 is the brightest SMG with a published spectroscopic redshift (z = 3.9296), and has an apparent star formation rate of order 1e4 Mo/yr. Recent EVLA observations reveal a complete Einstein ring for the CO emission, confirming the strong lensing hypothesis for MM1842. Using the CFHT, we have identified the lensing galaxy at the center of the CO ring, with z_phot ~ 1.0. MM1842 is the archetype, and best studied, of the new population of strongly lensed SMGs that have recently been identified in shallow, wide field submm surveys. These systems represent the formation of massive galaxies at high redshift in luminous starburst events. MM1842 presents a unique opportunity to study the physical processes involved in early galaxy formation at unprecedented physical resolution. The goal of this modest HST request is to obtain detailed information on the stellar distribution in the lensing galaxy. Such information is fundamental to accurate lens modeling of the system, as has been clearly demonstrated with the CASTLES HST survey. In parallel, we are performing high resolution imaging (0.1") of the very luminous CO, atomic fine structure line, and dust continuum emission from MM1842 with the EVLA and IRAM PdBI. Using the lens model, we can then trace back the gas distribution and dynamics in the source-plane at an effective physical resolution approaching 100pc. The proposed HST observations are crucial to constrain the lens model, and thereby enable a truly breath-taking, high physical resolution study of massive galaxy formation in the early Universe.

We propose a 1 orbit exposure with WFC3/F110W to image the strong gravitational lens system MM1842. We are aiming to a point source sensitivity is 27.15 AB (4σ). The goal is to obtain detailed information on the stellar distribution in the lensing galaxy at z ∼ 1. Such information is fundamental to improve the lens model for the system, enabling the accurate lens inversion studies discussed above. Even with this modest time request, these data will provide a high significance detection of the integrated emission from the lensing galaxy, which, combined with the superb spatial resolution (∼ 0.15”), will result in a precise determination of the lensing galaxy stellar distribution. Our current imaging suggests that the lensing galaxy is about 1” in extent, which is consistent with the expected size of such a lensing galaxy (∼ 8kpc; Langston et al. 1990), although this is complicated by the seeing limitations of the current ground based images. The light should then e distributed over about 40 diffraction limited resolution elements of the HST. At the proposed sensitivity, we should detect the light over this entire area, and obtain accurate measures of the position, ellipticity, orientation, and light profile of the galaxy. The sensitive imaging may also reveal substructure in the field (satellite galaxy, faint companions) which would also be critical to the lens model. Indeed, such substructure is already suggested by the presence of the brighter galaxy 4” to the north with a similar photometric redshift. None None None COSMOLOGY 12 false 0.0 0.0 false false false false SUPPORTED GALAXY EINSTEIN RING ELLIPTICAL GRAVITATIONAL LENS HIGH REDSHIFT GALAXY ULTRALUMINOUS IR GAL J2000 J2000 J (AB) = 21.8; H (AB)=21.2 WFC3/IR Imaging No No F110W POS-TARG DITHER 1.716 We enlarge by a factor of 3 the default pattern - thus keeping the sub-pixel dithering. LINE 1.095 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1 false 1309276699843 /Users/jeanpaulkneib/prop/hst/c19/mm1842/OP-cache/mm1842_v3-v01.xml The scheduling data was generated by CASM 19.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 12480 :visit-id "01" :proposal-version -1 :trans-version "20110509" :date "28-Jun-2011 17:58:19.0" :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 1810528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 12480 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 12480 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3108 :al-overhead-at-end 0 :internal-dur-at-end 711 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3511 :pcs-gap 0 ) true 1 0