ALMACAL V: absorption-selected galaxies with evidence for excited ISMs

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00540055" target="_blank" >RIV/67985815:_____/19:00540055 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnrasl/sly187" target="_blank" >https://doi.org/10.1093/mnrasl/sly187</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnrasl/sly187" target="_blank" >10.1093/mnrasl/sly187</a>

Jazyk výsledku

angličtina

Název v původním jazyce

ALMACAL V: absorption-selected galaxies with evidence for excited ISMs

Popis výsledku v původním jazyce

We present an analysis of multiple CO transitions (L-CO' similar to 10(9) K km s(-1)) in two z similar to 0.5 galaxies associated with one Ly alpha absorber towards J0238+1636. The CO spectral line energy distributions (CO SLEDs) of these galaxies appear distinct from that of typical star-forming galaxies at similar redshifts and is comparable with that of luminous infrared galaxies or active galactic nucleus (AGN). Indeed, these galaxies are associated with optically identified AGN activity. We infer that the CO line ratios and the alpha(CO) conversion factor differ from the Galactic values. Our findings suggest that at least a fraction of absorption-selected systems shows interstellar medium conditions deviating from those of normal star-forming galaxies. For a robust molecular gas mass calculation, it is therefore important to construct the CO SLED. Absorption line selection identifies systems with widely distributed gas, which may preferentially select interacting galaxies, which in turn will have more excited CO SLEDs than isolated galaxies. Furthermore, we raise the question whether quasar absorbers preferentially trace galaxy overdensities.

Název v anglickém jazyce

ALMACAL V: absorption-selected galaxies with evidence for excited ISMs

Popis výsledku anglicky

We present an analysis of multiple CO transitions (L-CO' similar to 10(9) K km s(-1)) in two z similar to 0.5 galaxies associated with one Ly alpha absorber towards J0238+1636. The CO spectral line energy distributions (CO SLEDs) of these galaxies appear distinct from that of typical star-forming galaxies at similar redshifts and is comparable with that of luminous infrared galaxies or active galactic nucleus (AGN). Indeed, these galaxies are associated with optically identified AGN activity. We infer that the CO line ratios and the alpha(CO) conversion factor differ from the Galactic values. Our findings suggest that at least a fraction of absorption-selected systems shows interstellar medium conditions deviating from those of normal star-forming galaxies. For a robust molecular gas mass calculation, it is therefore important to construct the CO SLED. Absorption line selection identifies systems with widely distributed gas, which may preferentially select interacting galaxies, which in turn will have more excited CO SLEDs than isolated galaxies. Furthermore, we raise the question whether quasar absorbers preferentially trace galaxy overdensities.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

—

Rok uplatnění

2019

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

842

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

5

Strana od-do

"L65"-"L69"

Kód UT WoS článku

000482176700014

EID výsledku v databázi Scopus

2-s2.0-85057196451