----- Attempting Submission 2 (Wed Mar 03 22:43:38 GMT 2010) -----
----- Attempting Submission 3 (Thu Mar 11 21:27:33 GMT 2010) -----
First Resolved Imaging of Escaping Lyman Continuum
The emission from star-forming galaxies appears to be responsible for reionization of the universe at z > 6. However, the models that attempt to describe the detailed impact of high-redshift galaxies on the surrounding inter-galactic medium (IGM) are strongly dependent upon several uncertain parameters. Perhaps the most uncertain is the fraction of HI-ionizing photons produced by young stars that escape into the IGM. Most attempts to measure this "escape fraction" have produced null results. Recently, a small subset of z~3 Lyman Break Galaxies (LBGs) has been found exhibiting large escape fractions. It remains unclear however, what differentiates them from other LBGs. Several models attempt to explain how such a large fraction of ionizing continuum can escape through the HI and dust in the ISM (eg. "chimneys" created by SNe winds, globular cluster formation, etc.), each producing unique signatures which can be observed with resolved imaging of the escaping Lyman continuum. To date, there are only six LBGs with individual detections of escaping Lyman continuum at any redshift. We propose a single deep, high resolution WFC3/UVIS image of the ionizing continuum (F336W) and the rest-frame UV/optical (F606W/F814W/F160W) of five of these six LBGs with large escape fractions. These LBGs have a high surface density and large escape fractions, and lie at the optimal redshift for Lyman continuum imaging with UVIS filters, making our sample especially suitable for follow-up. With these data we will discern the mechanisms responsible for producing large escape fractions, and therefore gain insight into the process of reionization.
We were allotted 39 orbits to take a deep (~33 orbit) F336W image, with six more orbits for F606W, F814W, F110W, and F160W (1 orbit each) with WFC3/UVIS and WFC3/IR. In addition, we were given parallel ACS imaging to follow-up on the existing cluster of LBGs in this field.
The WFC3 strategy is to do long (half-orbit) exposures in a 4-point dither pattern spread during 2-orbit visits. Each visit will have pos_targ offsets of order 1-2" in order to have the objects on different parts of the detector each time.
The parallels are split up into several components. 8 orbits using the F505N ramp filter to image a lyman alpha blob in the field. 2 orbits using the F475W filter for continuum subtraction from the line detected in the ramp filter. 13 orbits of F606W and 16 orbits of F814W to investigate the UV colors and morphologies of faint LBGs in the field. Nearly all of the visits are constrained to have the same orientation so the parallels cover the same field.
We accidentally requested 1 orbit of F606W and 1 orbit of F814W with UVIS, but meant to request these images with ACS (as it is much more sensitive at these wavelengths). We have submitted a change request, but haven't had a response yet, so we are submitting the observations with WFC3 images, as allotted in the original proposal.
COSMOLOGY
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(Tic-Visit
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(Tic-Obset
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true
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The scheduling data was generated by CASM 18.1.
CASM was run in Phase II mode.
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(Tic-Visit
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(Tic-Orbit
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true
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The scheduling data was generated by CASM 18.1.
CASM was run in Phase II mode.
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(Tic-Obset
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(Tic-Orbit
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(Tic-Orbit
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true
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The scheduling data was generated by CASM 18.1.
CASM was run in Phase II mode.
/Users/bsiana/proposals/HST/cycle17/lyc_uvis/phaseII/OP-cache/lyc_uvis_phaseII_acs-v16.xml
(Tic-Visit
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(Tic-Obset
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(Tic-Orbit
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(Tic-Orbit
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true
2
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The scheduling data was generated by CASM 18.1.
CASM was run in Phase II mode.
/Users/bsiana/proposals/HST/cycle17/lyc_uvis/phaseII/OP-cache/lyc_uvis_phaseII_acs-v17.xml
(Tic-Visit
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:si-bright-earth-limb-angle 20.0
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:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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(Tic-Orbit
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(Tic-Orbit
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true
2
0
The scheduling data was generated by CASM 18.1.
CASM was run in Phase II mode.
/Users/bsiana/proposals/HST/cycle17/lyc_uvis/phaseII/OP-cache/lyc_uvis_phaseII_acs-v18.xml
(Tic-Visit
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:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1425552
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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(Tic-Orbit
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:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
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:pcs-gap 0
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true
1
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The scheduling data was generated by CASM 18.1.
CASM was run in Phase II mode.
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(Tic-Visit
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(Tic-Orbit
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true
2
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The scheduling data was generated by CASM 18.1.
CASM was run in Phase II mode.
/Users/bsiana/proposals/HST/cycle17/lyc_uvis/phaseII/OP-cache/lyc_uvis_phaseII_acs-v20.xml
(Tic-Visit
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(Tic-Obset
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(Tic-Orbit
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(Tic-Orbit
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true
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