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----- Attempting Submission 3 (Wed Jul 10 06:46:53 GMT 2013) -----
HST Phase II Proposal 13349 (hst_p2v2.apt) successfully submitted.
----- Attempting Submission 4 (Thu Jul 11 00:28:34 GMT 2013) -----
HST Phase II Proposal 13349 (hst_p2v2.apt) successfully submitted.
----- Attempting Submission 5 (Thu Jul 11 00:32:11 GMT 2013) -----
Escaping Lyman Continuum in Strongly Lensed Galaxies at z=2.0-2.5
We propose to obtain deep WFC3 UVIS channel near ultraviolet (NUV) images of a sample of 6 bright lensed galaxies at z = 2.0 - 2.5 to detect the escaping Lyman continuum (LyC) radiation in order to study the physical properties of the LyC emitting region and the evolution of ionizing photon escape fraction with redshift. The LyC escape fraction is a key parameter in determining the contribution of star-forming galaxies to UV ionization background and to the cosmic reionization. It is, however, poorly constrained with conflicting results. In this proposal, we will use the observations of the brightest lensed galaxies (r<21.0) to provide accurate measurement of escape fraction in high-redshift galaxies, sensitive to the flux ratio between intergalactic medium corrected LyC and 1500A of as low as 0.5-3% in individual galaxies, and 0.2% when stacking all galaxies. In addition, lensing effect will allow us to probe a wide range of intrinsic luminosity (-20.5<M_UV<-23.5, 0.6L*-10L*), and the highly stretched images provide a high spatial resolution to study of the detailed LyC escape geometry. We will correlate LyC properties with physical properties of the lensed galaxies provided by existing deep HST imaging and ground-based near-IR spectroscopy to constrain physical models of LyC escape mechanism. Our sample will also fill the gap of the redshift range between 2.0 - 2.5 that has not been probed in previous works, allowing study of the evolution of escape fraction in the redshift range of z = 1 to 3.5.
This UV imaging observations of bright Lensed galaxies at z~2-3 is aiming to detect the Lyman continuum in these star-forming galaxies, which will give a strong constraint on the escape fraction in the galaxies at z~2-3. The filters are selected based on the redshift of the galaxies to cover the Lyman continuum emission from the galaxy. 3-orbits are planned for each galaxy, which are divided into 6 individual exposures.
As the WFC/UVIS detector has low ETC efficiency problem, we plan to post-flash the detector to 12e- per pxiel level, and post offset x=-60.00 y=-25.00 to move the target to lower left conner.
COSMOLOGY
Default
false
true
false
false
false
SUPPORTED
GALAXY
GRAVITATIONAL LENS
Einstein radius of ~8''
Every interesting structure is within a circle with a raduis of 10'' at the certer of the coordinate
J2000
J2000
r = 19.7
GALAXY
GRAVITATIONAL LENS
Einetein radius of 13"
J2000
J2000
r = 20.2
GALAXY
GRAVITATIONAL LENS
Einstein radius of 7''
J2000
J2000
r = 19.6
GALAXY
GRAVITATIONAL LENS
Einstein Radius of 4''
J2000
J2000
r = 19.0
GALAXY
GRAVITATIONAL LENS
The length of the Arc is 20''
J2000
J2000
r = 19.6
GALAXY
GRAVITATIONAL LENS
Too componets separated by 8''
J2000
J2000
r = 20.7
WFC3/UVIS
Imaging
No
No
F225W
WFC3/UVIS
Imaging
No
No
F218W
WFC3/UVIS
Imaging
No
No
F218W
WFC3/UVIS
Imaging
No
No
F218W
WFC3/UVIS
Imaging
No
No
F218W
WFC3/UVIS
Imaging
No
No
F275W
POS-TARG
DITHER
0.145
LINE
false
false
6
46.84
WFC3-UVIS-DITHER-LINE
1
false
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