The SILCC project V. The impact of magnetic fields on the chemistry and the formation of molecular clouds
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F18%3A00497317" target="_blank" >RIV/67985815:_____/18:00497317 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1093/mnras/sty2016" target="_blank" >http://dx.doi.org/10.1093/mnras/sty2016</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/sty2016" target="_blank" >10.1093/mnras/sty2016</a>
Alternative languages
Result language
angličtina
Original language name
The SILCC project V. The impact of magnetic fields on the chemistry and the formation of molecular clouds
Original language description
Magnetic fields are ubiquitously observed in the interstellar medium (ISM) of present-day star-forming galaxies with dynamically relevant energy densities. Using three-dimensional magnetohydrodynamic (MHD) simulations of the supernova-driven ISM in the flux-freezing approximation (ideal MHD), we investigate the impact of the magnetic field on the chemical and dynamical evolution of the gas, fragmentation, and the formation of molecular clouds. We follow the chemistry with a network of six species (H+, H, H-2, C+, CO, and free electrons) including local shielding effects. We find that magnetic fields thicken the disc by a factor of a few to a scale height of similar to 100 pc, delay the formation of dense (and molecular) gas by similar to 25 Myr, and result in differently shaped gas structures. The magnetized gas fragments into fewer clumps, which are initially at subcritical mass-to-flux ratios, M/Phi approximate to 0.3(M/Phi)(crit), and accrete gas preferentially parallel to the magnetic field lines until supercritial mass-toflux ratios of up to the order of 10 are reached. The accretion rates onto molecular clouds scale with M proportional to M-1.5. The median of the intercloud velocity dispersion is similar to 2 5 km s(-1) and lower than the internal velocity dispersion in the clouds (similar to 3 7 km s(-1)). However, individual cloud-cloud collisions occur at speeds of a few 10 km s(-1).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GB14-37086G" target="_blank" >GB14-37086G: Albert Einstein Center for Gravitation and Astrophysics</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Monthly Notices of the Royal Astronomical Society
ISSN
1365-2966
e-ISSN
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Volume of the periodical
480
Issue of the periodical within the volume
3
Country of publishing house
GB - UNITED KINGDOM
Number of pages
30
Pages from-to
3511-3540
UT code for WoS article
000449616200050
EID of the result in the Scopus database
2-s2.0-85054737784