Universität zu Köln

Girichidis, Philipp ORCID: 0000-0002-9300-9914, Naab, Thorsten ORCID: 0000-0002-7314-2558, Walch, Stefanie, Hanasz, Michal ORCID: 0000-0002-2370-5631, Mac Low, Mordecai-Mark ORCID: 0000-0003-0064-4060, Ostriker, Jeremiah P., Gatto, Andrea, Peters, Thomas, Wuensch, Richard, Glover, Simon C. O., Klessen, Ralf S., Clark, Paul C. and Baczynski, Christian (2016). LAUNCHING COSMIC-RAY-DRIVEN OUTFLOWS FROM THE MAGNETIZED INTERSTELLAR MEDIUM. Astrophys. J. Lett., 816 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 2041-8213

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Abstract

We present a hydrodynamical simulation of the turbulent, magnetized, supernova (SN)-driven interstellar medium (ISM) in a stratified box that dynamically couples the injection and evolution of cosmic rays (CRs) and a self-consistent evolution of the chemical composition. CRs are treated as a relativistic fluid in the advection-diffusion approximation. The thermodynamic evolution of the gas is computed using a chemical network that follows the abundances of H+, H, H-2, CO, C+, and free electrons and includes (self-) shielding of the gas and dust. We find that CRs perceptibly thicken the disk with the heights of 90% (70%) enclosed mass reaching greater than or similar to 1.5 kpc (greater than or similar to 0.2 kpc). The simulations indicate that CRs alone can launch and sustain strong outflows of atomic and ionized gas with mass loading factors of order unity, even in solar neighborhood conditions and with a CR energy injection per SN of 10(50) erg, 10% of the fiducial thermal energy of an SN. The CR-driven outflows have moderate launching velocities close to the midplane (less than or similar to 100 km s(-1)) and are denser (rho similar to 10(-24)-10(-26) g cm(-3)), smoother, and colder than the (thermal) SN-driven winds. The simulations support the importance of CRs for setting the vertical structure of the disk as well as the driving of winds.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Girichidis, Philipp UNSPECIFIED orcid.org/0000-0002-9300-9914 UNSPECIFIED Naab, Thorsten UNSPECIFIED orcid.org/0000-0002-7314-2558 UNSPECIFIED Walch, Stefanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Hanasz, Michal UNSPECIFIED orcid.org/0000-0002-2370-5631 UNSPECIFIED Mac Low, Mordecai-Mark UNSPECIFIED orcid.org/0000-0003-0064-4060 UNSPECIFIED Ostriker, Jeremiah P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gatto, Andrea UNSPECIFIED UNSPECIFIED UNSPECIFIED Peters, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Wuensch, Richard UNSPECIFIED UNSPECIFIED UNSPECIFIED Glover, Simon C. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klessen, Ralf S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Clark, Paul C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Baczynski, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-287490
DOI:	10.3847/2041-8205/816/2/L19
Journal or Publication Title:	Astrophys. J. Lett.
Volume:	816
Number:	2
Date:	2016
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	2041-8213
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STAR-FORMING GALAXIES; GALACTIC WINDS; SIMULATIONS; TURBULENT; GAS; ISM; PROPAGATION; KINEMATICS; EVOLUTION; DIFFUSION Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28749