AN IONIZATION CONE IN THE DWARF STARBURST GALAXY NGC 5253
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Zastrow-2011-An Ionization cone i.pdf
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Author(s)
Zastrow, Jordan
Oey, M. S.
Veilleux, Sylvain
Martin, Crystal L.
McDonald, Michael A.
Date Issued
October 2011
Journal
Astrophysical Journal. Letters
Publisher
IOP Publishing
Citation
Zastrow, Jordan, M. S. Oey, Sylvain Veilleux, Michael McDonald, and Crystal L. Martin. “AN IONIZATION CONE IN THE DWARF STARBURST GALAXY NGC 5253.” The Astrophysical Journal 741, no. 1 (October 12, 2011): L17. © 2011 The American Astronomical Society
Version
Final published version
Abstract
There are few observational constraints on how the escape of ionizing photons from starburst galaxies depends on galactic parameters. Here we report on the first major detection of an ionization cone in NGC 5253, a nearby starburst galaxy. This high-excitation feature is identified by mapping the emission-line ratios in the galaxy using [S III] λ9069, [S II] λ6716, and Hα narrowband images from the Maryland-Magellan Tunable Filter at Las Campanas Observatory. The ionization cone appears optically thin, which suggests the escape of ionizing photons. The cone morphology is narrow with an estimated solid angle covering just 3% of 4π steradians, and the young, massive clusters of the nuclear starburst can easily generate the radiation required to ionize the cone. Although less likely, we cannot rule out the possibility of an obscured active galactic nucleus source. An echelle spectrum along the minor axis shows complex kinematics that are consistent with outflow activity. The narrow morphology of the ionization cone supports the scenario that an orientation bias contributes to the difficulty in detecting Lyman continuum emission from starbursts and Lyman break galaxies.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/2041-8205/741/1/L17
