NARROWBAND LYMAN-CONTINUUM IMAGING OF GALAXIES AT z ∼ 2.85

We present results from a survey for z ~ 2.85 Lyman-continuum (LyC) emission in the HS1549+1933 field and place constraints on the amount of ionizing radiation escaping from star-forming galaxies. Using a custom narrowband filter (NB3420) tuned to wavelengths just below the Lyman limit at z [> or...

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Bibliographic Details
Published in:The Astrophysical journal 2013-12, Vol.779 (1), p.1-20
Main Authors: Mostardi, R E, Shapley, A E, Nestor, D B, Steidel, C C, Reddy, N A, Trainor, R F
Format: Article
Language:English
Subjects:
ABSORPTION
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COLOR
COSMOLOGY
DETECTION
EMISSION
EMISSIVITY
Equivalence
FILTERS
FLUX DENSITY
GALAXIES
Imaging
Ionizing radiation
LIMITING VALUES
LYMAN LINES
Narrowband
RED SHIFT
Spectral emittance
STARS
SYNTHESIS
WAVELENGTHS
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Summary:We present results from a survey for z ~ 2.85 Lyman-continuum (LyC) emission in the HS1549+1933 field and place constraints on the amount of ionizing radiation escaping from star-forming galaxies. Using a custom narrowband filter (NB3420) tuned to wavelengths just below the Lyman limit at z [> or =, slanted] 2.82, we probe the LyC spectral region of 49 Lyman break galaxies (LBGs) and 91 Ly alpha emitters (LAEs) spectroscopically confirmed at z [> or =, slanted] 2.82. Four LBGs and seven LAEs are detected in NB3420. We find (F sub(UV)/F sub(LyC)) sub(LBG) super(corr) = 82 + or - 45 and (F sub(UV)/F sub(LyC)) super(LAE) sub(corr ) = 7.4 + or - 3.6. In order to study the differential properties of galaxies with and without LyC detections, we analyze narrowband Ly alpha imaging and rest-frame near-infrared imaging, finding that while LAEs with Ly alpha detections have lower Ly alpha equivalent widths on average, there is no substantial difference in the rest-frame near-infrared colors of LBGs or LAEs with and without LyC detections.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/779/1/65