The inception of star cluster formation revealed by [C ii] emission around an Infrared Dark Cloud
Artikel i vetenskaplig tidskrift, 2018

We present SOFIA-upGREAT observations of [C ii] emission of Infrared Dark Cloud (IRDC) G035.39-00.33, designed to trace its atomic gas envelope and thus test models of the origins of such clouds. Several velocity components of [C ii] emission are detected, tracing structures that are at a wide range of distances in the Galactic plane. We find a main component that is likely associated with the IRDC and its immediate surroundings. This strongest emission component has a velocity similar to that of the 13CO(2-1) emission of the IRDC, but offset by ∼3 km s-1 and with a larger velocity width of ∼9 km s-1. The spatial distribution of the [C ii] emission of this component is also offset predominantly to one side of the dense filamentary structure of the IRDC. The C ii column density is estimated to be of the order of ∼1017-1018 cm-2. We compare these results to the [C ii] emission from numerical simulations of magnetized, dense gas filaments formed from giant molecular cloud (GMC) collisions, finding similar spatial and kinematic offsets. These observations and modellingof [C ii] add further to the evidence that IRDC G035.39-00.33 has been formed by a process of GMC-GMC collision, which may thus be an important mechanism for initiating star cluster formation.

radiative transfer

ISM: clouds

ISM: kinematics and dynamics

Författare

T. G. Bisbas

University of Virginia

Max-Planck-Gesellschaft

Jonathan Tan

University of Virginia

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

T. Csengeri

Max-Planck-Gesellschaft

Benjamin Wu

National Astronomical Observatory of Japan

Wanggi Lim

NASA Ames Research Center

P. Caselli

Max-Planck-Gesellschaft

R. Güsten

Max-Planck-Gesellschaft

Oliver Ricken

Max-Planck-Gesellschaft

D. Riquelme

Max-Planck-Gesellschaft

Monthly Notices of the Royal Astronomical Society: Letters

17453925 (ISSN) 17453933 (eISSN)

Vol. 478 1 L54-L59

Ämneskategorier

Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Fusion, plasma och rymdfysik

DOI

10.1093/mnrasl/sly039

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Senast uppdaterat

2021-03-26