Synthetic [C II] emission maps of a simulated molecular cloud in formation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F18%3A00497322" target="_blank" >RIV/67985815:_____/18:00497322 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1093/mnras/sty2507" target="_blank" >http://dx.doi.org/10.1093/mnras/sty2507</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/sty2507" target="_blank" >10.1093/mnras/sty2507</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Synthetic [C II] emission maps of a simulated molecular cloud in formation

Popis výsledku v původním jazyce

We carry out non-LTE (local thermal equilibrium) radiative transfer simulations with RADMC-3D to study the [C II] line emission from a young, turbulent molecular cloud before the onset of star formation, using data from the SILCC-Zoom project. The [C II] emission is optically thick over 40 per cent of the observable area with I[C II] > 0.5 K km s-1. To determine the physical properties of the [C II] emitting gas, we treat the [C II] emission as optically thin. We find that the [C II] emission originates primarily from cold, moderate density gas (40 ≲ T ≲ 65 K and 50 ≲ n ≲ 440 cm-3), composed mainly of atomic hydrogen and with an effective visual extinction between ˜0.50 and ˜0.91. Gas dominated by molecular hydrogen contributes only ≲20 per cent of the total [C II] line emission. Thus, [C II] is not a good tracer for CO-dark H2 at this early phase in the cloud's lifetime. We also find that the total gas, H and C+ column densities are all correlated with the integrated [C II] line emission, with power law slopes ranging from 0.5 to 0.7. Further, the median ratio between the total column density and the [C II] line emission is YC II ≈ 1.1 × 1021 cm-2 (K km s-1)-1, and Y_{C II}} scales with I_{[C II]}^{-0.3}. We expect Y_{C II} to change in environments with a lower or higher radiation field than simulated here.

Název v anglickém jazyce

Synthetic [C II] emission maps of a simulated molecular cloud in formation

Popis výsledku anglicky

We carry out non-LTE (local thermal equilibrium) radiative transfer simulations with RADMC-3D to study the [C II] line emission from a young, turbulent molecular cloud before the onset of star formation, using data from the SILCC-Zoom project. The [C II] emission is optically thick over 40 per cent of the observable area with I[C II] > 0.5 K km s-1. To determine the physical properties of the [C II] emitting gas, we treat the [C II] emission as optically thin. We find that the [C II] emission originates primarily from cold, moderate density gas (40 ≲ T ≲ 65 K and 50 ≲ n ≲ 440 cm-3), composed mainly of atomic hydrogen and with an effective visual extinction between ˜0.50 and ˜0.91. Gas dominated by molecular hydrogen contributes only ≲20 per cent of the total [C II] line emission. Thus, [C II] is not a good tracer for CO-dark H2 at this early phase in the cloud's lifetime. We also find that the total gas, H and C+ column densities are all correlated with the integrated [C II] line emission, with power law slopes ranging from 0.5 to 0.7. Further, the median ratio between the total column density and the [C II] line emission is YC II ≈ 1.1 × 1021 cm-2 (K km s-1)-1, and Y_{C II}} scales with I_{[C II]}^{-0.3}. We expect Y_{C II} to change in environments with a lower or higher radiation field than simulated here.

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/GB14-37086G" target="_blank" >GB14-37086G: Centrum Alberta Einsteina pro gravitaci a astrofyziku</a><br>

Návaznosti

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

Rok uplatnění

2018

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

481

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

23

Strana od-do

4277-4299

Kód UT WoS článku

000454575100001

EID výsledku v databázi Scopus

2-s2.0-85050084544