Diverse properties of Ly alpha emission in low-redshift compact star-forming galaxies with extremely high [O III]/[O II] ratios

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00535761" target="_blank" >RIV/67985815:_____/20:00535761 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1093/mnras/stz3041" target="_blank" >https://doi.org/10.1093/mnras/stz3041</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/stz3041" target="_blank" >10.1093/mnras/stz3041</a>

Result language
angličtina
Original language name
Diverse properties of Ly alpha emission in low-redshift compact star-forming galaxies with extremely high [O III]/[O II] ratios
Original language description
We present observations with the Cosmic Origins Spectrograph onboard the Hubble Space Telescope of eight compact star-forming galaxies at redshifts z = 0.02811-0.06540, with low oxygen abundances 12 + log(O/H) = 7.43-7.82 and extremely high emission-line flux ratios O-32 = [O III] lambda 5007/[O II] lambda 3727 similar to 22-39, aiming to study the properties of Ly alpha emission in such conditions. We find a diversity in Ly alpha properties. In five galaxies Ly alpha emission line is strong, with equivalent width (EW) in the range 45-190 angstrom. In the remaining galaxies, weak Ly alpha emission with EW(Ly alpha) similar to 2-7 angstrom is superposed on a broad Ly alpha absorption line, indicating a high neutral hydrogen column density N(H I) similar to (1 - 3)x 10(21) cm(-2). We examine the relation between the Ly alpha escape fraction f(esc)(Ly alpha) and the Lyman continuum escape fraction f(esc)(LyC), using direct measures of the latter in eleven low-redshift LyC leakers, to verify whether f(esc)(Ly alpha) can be an indirect measure of escaping LyC radiation.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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