Eight per cent leakage of Lyman continuum photons from a compact, star-forming dwarf galaxy.

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F16%3A00463540" target="_blank" >RIV/67985815:_____/16:00463540 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1038/nature16456" target="_blank" >http://dx.doi.org/10.1038/nature16456</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/nature16456" target="_blank" >10.1038/nature16456</a>

Result language
angličtina
Original language name
Eight per cent leakage of Lyman continuum photons from a compact, star-forming dwarf galaxy.
Original language description
One of the key questions in observational cosmology is the identification of the sources responsible for ionization of the Universe after the cosmic 'Dark Ages', when the baryonic matter was neutral. The currently identified distant galaxies are insufficient to fully reionize the Universe by redshift z approximate to 6 (refs 1-3), but low-mass, star-forming galaxies are thought to be responsible for the bulk of the ionizing radiation(4-6). As direct observations at high redshift are difficult for a variety of reasons, one solution is to identify local proxies of this galaxy population. Starburst galaxies at low redshifts, however, generally are opaque to Lyman continuum photons(7-9). Small escape fractions of about 1 to 3 per cent, insufficient to ionize much surrounding gas, have been detected only in three low-redshift galaxies(10,11). Here we report far-ultraviolet observations of the nearby low-mass star-forming galaxy J0925+ 1403. The galaxy is leaking ionizing radiation with an escape fraction of about 8 per cent. The total number of photons emitted during the starburst phase is sufficient to ionize intergalactic medium material that is about 40 times as massive as the stellar mass of the galaxy.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BN - Astronomy and celestial mechanics, astrophysics
OECD FORD branch
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Project
<a href="/en/project/GP14-20666P" target="_blank" >GP14-20666P: Understanding the origin of Lyman-alpha emission and absorption in galaxies</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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