Universität zu Köln

Gronke, Max ORCID: 0000-0003-2491-060X, Girichidis, Philipp ORCID: 0000-0002-9300-9914, Naab, Thorsten ORCID: 0000-0002-7314-2558 and Walch, Stefanie ORCID: 0000-0001-6941-7638 (2018). The Imprint of Cosmic Ray Driven Outflows on Lyman-alpha Spectra. Astrophys. J. Lett., 862 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 2041-8213

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Abstract

Recent magnetohydrodynamic simulations of the star-forming interstellar medium (ISM) with parsec-scale resolution indicate that relativistic cosmic rays (CRs) support the launching of galactic outflows on scales of a few kpc. If these fundamental constituents of the ISM are injected at the sites of supernova (SN) explosions, the outflows are smoother, colder, and denser than the highly structured, hot-phase driven outflows forming, e.g., by thermal SN energy injection alone. In this Letter we present computations of resonant Lyman-alpha(Ly alpha) radiation transfer through snapshots of a suite of stratified disk simulations from the SILCC project. For a range of thermal, radiative, and kinetic feedback models only simulations including non-thermal CRs produce Lya spectra with enhanced red peaks and strong absorption at line center-similar to observed systems. The absence of CR feedback leads to spectra incompatible with observations. We attribute this to the smoother neutral gas distribution of CR supported outflows within a few kpc from the disk midplane.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gronke, Max UNSPECIFIED orcid.org/0000-0003-2491-060X UNSPECIFIED Girichidis, Philipp UNSPECIFIED orcid.org/0000-0002-9300-9914 UNSPECIFIED Naab, Thorsten UNSPECIFIED orcid.org/0000-0002-7314-2558 UNSPECIFIED Walch, Stefanie UNSPECIFIED orcid.org/0000-0001-6941-7638 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-179613
DOI:	10.3847/2041-8213/aad286
Journal or Publication Title:	Astrophys. J. Lett.
Volume:	862
Number:	1
Date:	2018
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	2041-8213
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CIRCUMGALACTIC MEDIUM; INTERSTELLAR-MEDIUM; MOLECULAR CLOUDS; GALAXIES; EMISSION; EVOLUTION; RADIATION; EMITTERS; PROJECT; IMPACT Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/17961