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arxiv: 1805.09865 · v1 · pith:RH447IFQnew · submitted 2018-05-24 · 🌌 astro-ph.GA

Low-redshift Lyman continuum leaking galaxies with high [OIII]/[OII] ratios

Y. I. Izotov (1) , G. Worseck (2) , D. Schaerer (3) , N. G. Guseva (1) , T. X. Thuan (4) , K. J. Fricke (5) , A. Verhamme (3) , I. Orlitova (6) ((1) Main Astronomical Observatory
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Kyiv Ukraine (2) Institut fuer Physik und Astronomie Universitat Potsdam Germany (3) Observatoire de Geneve Versoix Switzerland (4) Astronomie Department University of Virginia Charlottesville USA (5) Institut fuer Astrophysik Goettingen Universitat (6) Astronomical Institute Prague Czech Republic)
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keywords escapegalaxiesemissionfescpeaksvsepcontinuumdetect
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We present observations with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope of five star-forming galaxies at redshifts z in the range 0.2993-0.4317 and with high emission-line flux ratios O32=[OIII]5007/[OII]3727 ~ 8-27 aiming to detect the Lyman continuum (LyC) emission. We detect LyC emission in all galaxies with the escape fractions fesc(LyC) in a range of 2-72 per cent. A narrow Ly-alpha emission line with two peaks in four galaxies and with three peaks in one object is seen in medium-resolution COS spectra with a velocity separation between the peaks Vsep varying from ~153 km/s to ~345 km/s. We find a general increase of the LyC escape fraction with increasing O32 and decreasing stellar mass M*, but with a large scatter of fesc(LyC). A tight anti-correlation is found between fesc(LyC) and Vsep making Vsep a good parameter for the indirect determination of the LyC escape fraction. We argue that one possible source driving the escape of ionizing radiation is stellar winds and radiation from hot massive stars.

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