Universität zu Köln

Haid, S., Walch, S., Seifried, D., Wunsch, R., Dinnbier, F. and Naab, T. (2019). SILCC-Zoom: The early impact of ionizing radiation on forming molecular clouds. Mon. Not. Roy. Astron. Soc., 482 (3). S. 4062 - 4084. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

As part of the SILCC-Zoom project, we present our first sub-parsec resolution radiation hydrodynamic simulations of two molecular clouds self-consistently forming from a turbulent, multiphase ISM. The clouds have similar initial masses of few 10(4) M-circle dot, escape velocities of -5 km s(-1), and a similar initial energy budget. We follow the formation of star clusters with a sink-based model and the impact of radiation from individual massive stars with the tree-based radiation transfer module TREERAY. Photoionizing radiation is coupled to a chemical network to follow gas heating, cooling, and molecule formation and dissociation. For the first 3 Myr of cloud evolution, we find that the overall star formation efficiency is considerably reduced by a factor of similar to 4 to global cloud values of < 10 per cent as the mass accretion of sinks that host massive stars is terminated after less than or similar to 1 Myr. Despite the low efficiency, star formation is triggered across the clouds. Therefore, a much larger region of the cloud is affected by radiation and the clouds begin to disperse. The time-scale on which the clouds are dispersed sensitively depends on the cloud sub-structure and in particular on the amount of gas at high visual extinction. The damage of radiation done to the highly shielded cloud (MC1) is delayed. We also show that the radiation input can sustain the thermal and kinetic energy of the clouds at a constant level. Our results strongly support the importance of ionizing radiation from massive stars for explaining the low-observed star formation efficiency of molecular clouds.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Haid, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Walch, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Seifried, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wunsch, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dinnbier, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Naab, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-139331
DOI:	10.1093/mnras/sty2938
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	482
Number:	3
Page Range:	S. 4062 - 4084
Date:	2019
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STAR-FORMATION RATES; SUPERNOVA-DRIVEN ISM; WIND-BLOWN BUBBLES; BRIGHT OB-STARS; INTERSTELLAR-MEDIUM; MASSIVE STARS; GRAVITATIONAL COLLAPSE; STELLAR FEEDBACK; DYNAMICAL EVOLUTION; CLUSTER FORMATION Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13933