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    High Lyman Continuum Escape Fraction in a Lensed Young Compact Dwarf Galaxy at z=2.5

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    Author
    Bian, Fuyan cc
    Fan, Xiaohui cc
    McGreer, Ian D. cc
    Cai, Zheng cc
    Jiang, Linhua cc
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-03-02
    Keywords
    cosmology: observations
    dark ages, reionization, first stars
    galaxies: high-redshift
    gravitational lensing: strong
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    High Lyman Continuum Escape Fraction in a Lensed Young Compact Dwarf Galaxy at z=2.5 2017, 837 (1):L12 The Astrophysical Journal
    Journal
    The Astrophysical Journal Letters
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present the HST WFC3/F275W UV imaging observations of A2218-Flanking, a lensed compact dwarf galaxy at redshift z approximate to 2.5. The stellar mass of A2218-Flanking is log(M-*/M-circle dot) = 9.14(-0.04)(+0.07) and SFR is 12.5(-7.4)(+3.8) M-circle dot yr(-1) after correcting the magnification. This galaxy has a young galaxy age of 127. Myr and a compact galaxy size of r(1/2) = 2.4 kpc. The HST UV imaging observations cover the rest-frame Lyman continuum (LyC) emission (similar to 800 angstrom) from A2218-Flanking. We firmly detect (14s) the LyC emission in A2218-Flanking in the F275W image. Together with the HST F606W images, we find that the absolute escape fraction of LyC is f(abs,esc) > 28%-57% based on the flux density ratio between 1700 and 800 angstrom (f(1700)/f(800)). The morphology of the LyC emission in the F275W images is extended and follows the morphology of the UV continuum morphology in the F606W images, suggesting that the f(800) is not from foreground contaminants. We find that the region with a high star formation rate surface density has a lower f(1700)/f(800) (higher f(800)/f(1700)) ratio than the diffused regions, suggesting that LyC photons are more likely to escape from the region with the intensive star-forming process. We compare the properties of galaxies with and without LyC detections and find that LyC photons are easier to escape in low-mass galaxies.
    ISSN
    2041-8213
    DOI
    10.3847/2041-8213/aa5ff7
    Version
    Final published version
    Sponsors
    NASA through Space Telescope Science Institute [13349]; NASA [NAS 5-26555]
    Additional Links
    http://stacks.iop.org/2041-8205/837/i=1/a=L12?key=crossref.9c1680ee1188a2b32c3470731d83335c
    ae974a485f413a2113503eed53cd6c53
    10.3847/2041-8213/aa5ff7
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    UA Faculty Publications

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