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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

—

Projekt

<a href="/cs/project/GP14-20666P" target="_blank" >GP14-20666P: Původ emise a absorpce Lyman alfa v galaxiích</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nature

ISSN

0028-0836

e-ISSN

—

Svazek periodika

529

Číslo periodika v rámci svazku

7585

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

3

Strana od-do

178-180

Kód UT WoS článku

000368015700029

EID výsledku v databázi Scopus

2-s2.0-84954267271