Universität zu Köln

Girichidis, Philipp ORCID: 0000-0002-9300-9914, Naab, Thorsten, Walch, Stefanie ORCID: 0000-0001-6941-7638 and Berlok, Thomas ORCID: 0000-0003-0466-603X (2021). The in situ formation of molecular and warm ionized gas triggered by hot galactic outflows. Mon. Not. Roy. Astron. Soc., 505 (1). S. 1083 - 1105. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

Molecular outflows contributing to the matter cycle of star-forming galaxies are now observed in small and large systems at low and high redshift. Their physical origin is still unclear. In most theoretical studies, only warm ionized/neutral and hot gas outflowing from the interstellar medium is generated by star formation. We investigate an in situ H-2 formation scenario in the outflow using high-resolution simulations, including non-equilibrium chemistry and self-gravity, of turbulent, warm, and atomic clouds with densities 0.1, 0.5, and 1 cm(-1) exposed to a magnetized hot wind. For cloud densities greater than or similar to 0.5 cm(-3), a magnetized wind triggers H-2 formation before cloud dispersal. Up to 3 percent of the initial cloud mass can become molecular on time-scales. The effect is stronger for winds with perpendicular B-fields and intermediate density clouds (n(c) similar to 0.5 cm(-3)). Here, H-2 formation can be boosted by up to one order of magnitude compared to isolated cooling clouds independent of self-gravity. Self-gravity preserves the densest clouds well past their similar to 15 Myr cloud crushing time-scales. This model could provide a plausible in situ origin for the observed molecular gas. All simulations form warm ionized gas, which represents an important observable phase. The amount of warm ionized gas is almost independent of the cloud density but solely depends on the magnetic field configuration in the wind. For low-density clouds (0.1 cm(-3)), up to 60 percent of the initially atomic cloud mass can become warm and ionized.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Girichidis, Philipp UNSPECIFIED orcid.org/0000-0002-9300-9914 UNSPECIFIED Naab, Thorsten UNSPECIFIED UNSPECIFIED UNSPECIFIED Walch, Stefanie UNSPECIFIED orcid.org/0000-0001-6941-7638 UNSPECIFIED Berlok, Thomas UNSPECIFIED orcid.org/0000-0003-0466-603X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-579915
DOI:	10.1093/mnras/stab1203
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	505
Number:	1
Page Range:	S. 1083 - 1105
Date:	2021
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WIND-CLOUD INTERACTIONS; NEUTRAL ATOMIC PHASES; INTERSTELLAR-MEDIUM; STAR-FORMATION; SHOCK-CLOUD; FILAMENT FORMATION; MAGNETIC-FIELDS; HYDRODYNAMIC INTERACTION; PHYSICAL PROCESSES; SILCC PROJECT Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57991