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:
CreatorsEmailORCIDORCID Put Code
Girichidis, PhilippUNSPECIFIEDorcid.org/0000-0002-9300-9914UNSPECIFIED
Naab, ThorstenUNSPECIFIEDorcid.org/0000-0002-7314-2558UNSPECIFIED
Walch, StefanieUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hanasz, MichalUNSPECIFIEDorcid.org/0000-0002-2370-5631UNSPECIFIED
Mac Low, Mordecai-MarkUNSPECIFIEDorcid.org/0000-0003-0064-4060UNSPECIFIED
Ostriker, Jeremiah P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gatto, AndreaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peters, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wuensch, RichardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Glover, Simon C. O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klessen, Ralf S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Clark, Paul C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baczynski, ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
STAR-FORMING GALAXIES; GALACTIC WINDS; SIMULATIONS; TURBULENT; GAS; ISM; PROPAGATION; KINEMATICS; EVOLUTION; DIFFUSIONMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/28749

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