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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

1365-2966

e-ISSN

—

Svazek periodika

491

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

15

Strana od-do

468-482

Kód UT WoS článku

000512163600033

EID výsledku v databázi Scopus

2-s2.0-85079469544