My title is updated to Dr. Hong and the email address to shong@noao.edu Assigned ID: 925 ----- Attempting Submission 1 (Fri Feb 24 23:41:34 GMT 2012) ----- HST Phase I Proposal 925 (HST2012Proposal.apt) successfully submitted. ----- Attempting Submission 2 (Fri Feb 24 23:44:41 GMT 2012) ----- HST Phase I Proposal 925 (HST2012Proposal.apt) successfully submitted. ----- Attempting Submission 3 (Sat Feb 25 00:25:34 GMT 2012) ----- I have adjusted the coordinates of pointings. If the change makes some problem, please let me know. ----- Attempting Submission 1 (Sat Jul 07 00:50:33 GMT 2012) ----- Impact of Environments on Lyman alpha Emitting Galaxies at High Redshift (z ~ 2.7) In the current paradigm of hierarchical structure formation of the Universe, environment appears to have a critical impact on galaxy formation and evolution. Our team has performed a deep intermediate-band survey for Lyman alpha emission in a ~ 1 deg^2 region (corresponding to ~ 100×100 comoving Mpc^2) around the z = 2.656 Lyα blob discovered by Dey. et al. (2005). This survey has uncovered 2200 Lyα emitting galaxies (LAEs) and two more large Lyα blobs. The blobs lie within a >~60 Mpc (comoving) long filament traced by the LAEs. The number density of LAEs is higher near the blobs, showing an overdensity at least > 3× the field density. We propose to investigate the effect of environment on LAEs by comparing the properties of those near high density regions with those in the outlying low- density regions of the field. The WFC3/IR F110W (J) and F160W (H) filters are fortuitously positioned right at the redshifted age-sensitive Balmer break region at z = 2.7, ideal for estimating stellar mass and age in the relatively dust-free LAEs. With F139M images, we will also measure the strength of the redshifted [OII](3727,3729) doublet in the LAEs, and thereby estimate (a) the line contamination to the broad-band photometry; (b) the star- formation rate (and compare it to the SFR derived from Lyman alpha and UV continuum; and (c) discover other non-Lyα-emitting [OII] emitters in the field. A detailed comparison of the stellar populations and masses of LAEs and [OII] emitters in low and high density environments will shed light on the formation history of the densest locations in the high-redshift Universe. We have 7 pointings in the Bootes field. Each pointing consists of 4 orbits (F110W [1], F160W [1], F139M [2]). 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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