Universität zu Köln

Haid, S., Walch, S., Seifried, D., Wunsch, R., Dinnbier, F. and Naab, T. (2018). The relative impact of photoionizing radiation and stellar winds on different environments. Mon. Not. Roy. Astron. Soc., 478 (4). S. 4799 - 4816. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

Photoionizing radiation and stellar winds from massive stars deposit energy and momentum into the interstellar medium (ISM). They might disperse the local ISM, change its turbulent multi-phase structure, and even regulate star formation. Ionizing radiation dominates the massive stars' energy output, but the relative effect of winds might change with stellar mass and the properties of the ambient ISM. We present simulations of the interaction of stellar winds and ionizing radiation of 12, 23, and 60 M-circle dot stars within a cold neutral (CNM, n(0) = 100 cm(-3)), warm neutral (WNM, n(0) = 1, 10 cm (-3)), or warm ionized (WIM, n(0) = 0.1 cm(-3)) medium. The FLASH simulations adopt the novel tree-based radiation transfer algorithm TREERAY. With the On-the-Spot approximation and a temperature-dependent recombination coefficient, it is coupled to a chemical network with radiative heating and cooling. In the homogeneous CNM, the total momentum injection ranges from 1.6 x 10(4) to 4 x 105 M-circle dot km s(-1) and is always dominated by the expansion of the ionized HII region. In the WIM, stellar winds dominate (2 x 10(2) to 5 x 10(3) M-circle dot km s(-1)), while the input from radiation is small (similar to 10(2) M-circle dot km s(-1)). The WNM (n(0) = 1 cm(-3)) is a transition regime. Energetically, stellar winds couple more efficiently to the ISM (similar to 0.1 percent of wind luminosity) than radiation (< 0.001 percent of ionizing luminosity). For estimating the impact of massive stars, the strongly mass-dependent ratios of wind to ionizing luminosity and the properties of the ambient medium have to be considered.

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:38-178315
DOI:	10.1093/mnras/sty1315
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	478
Number:	4
Page Range:	S. 4799 - 4816
Date:	2018
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language H-II REGIONS; TRIGGERED STAR-FORMATION; WOLF-RAYET BUBBLES; MOLECULAR CLOUDS; MASSIVE STARS; INTERSTELLAR-MEDIUM; BLOWN BUBBLES; HIGH-RESOLUTION; ENERGY-BALANCE; FEEDBACK Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17831