Lyman-alpha spectral properties of five newly discovered Lyman continuum emitters

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F17%3A00484656" target="_blank" >RIV/67985815:_____/17:00484656 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1051/0004-6361/201629264" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201629264</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201629264" target="_blank" >10.1051/0004-6361/201629264</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Lyman-alpha spectral properties of five newly discovered Lyman continuum emitters

Popis výsledku v původním jazyce

We have recently reported the discovery of five low redshift Lyman continuum (LyC) emitters (LCEs) with absolute escape lfractions f(esc)(LyC) that range from 6 to 13%, higher than previously found and that more than double the number of low redshift LCEs. We use these observations to test theoretical predictions about a link between the characteristics of the Lyman-alpha (Ly alpha) line from galaxies and the escape of ionizing photons. Our LCEs are found to be strong Ly alpha emitters, with high equivalent widths, EW(Ly alpha) > 70 angstrom, and large Ly alpha escape fractions, f(esc)(Ly alpha)> 20%. The Ly alpha profiles are all double-peaked with a small peak separation, in agreement with our theoretical expectations. They also have no underlying absorption at the Ly alpha position. All these characteristics are very different from the Ly alpha properties of typical star-forming galaxies of the local Universe. A subset of the comparison samples (2-3 Green Pea galaxies) share these extreme values, indicating that they could also be leaking. We also find a strong correlation between the star formation rate surface density and the escape fraction of ionizing photons, indicating that the compactness of star-forming regions plays a role in shaping low column density paths in the interstellar medium of LCEs.

Název v anglickém jazyce

Lyman-alpha spectral properties of five newly discovered Lyman continuum emitters

Popis výsledku anglicky

We have recently reported the discovery of five low redshift Lyman continuum (LyC) emitters (LCEs) with absolute escape lfractions f(esc)(LyC) that range from 6 to 13%, higher than previously found and that more than double the number of low redshift LCEs. We use these observations to test theoretical predictions about a link between the characteristics of the Lyman-alpha (Ly alpha) line from galaxies and the escape of ionizing photons. Our LCEs are found to be strong Ly alpha emitters, with high equivalent widths, EW(Ly alpha) > 70 angstrom, and large Ly alpha escape fractions, f(esc)(Ly alpha)> 20%. The Ly alpha profiles are all double-peaked with a small peak separation, in agreement with our theoretical expectations. They also have no underlying absorption at the Ly alpha position. All these characteristics are very different from the Ly alpha properties of typical star-forming galaxies of the local Universe. A subset of the comparison samples (2-3 Green Pea galaxies) share these extreme values, indicating that they could also be leaking. We also find a strong correlation between the star formation rate surface density and the escape fraction of ionizing photons, indicating that the compactness of star-forming regions plays a role in shaping low column density paths in the interstellar medium of LCEs.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

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

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

—

Svazek periodika

597

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

13

Strana od-do

"A13/1"-"A13/13"

Kód UT WoS článku

000392392900098

EID výsledku v databázi Scopus

2-s2.0-85007246530