| Online-Ressource |
Verfasst von: | Pardi, Anabele-Linda [VerfasserIn]  |
| Glover, Simon [VerfasserIn]  |
| Klessen, Ralf S. [VerfasserIn]  |
Titel: | The impact of magnetic fields on the chemical evolution of the supernova-driven ISM |
Verf.angabe: | A. Pardi, P. Girichidis, T. Naab, S. Walch, T. Peters, F. Heitsch, S.C.O. Glover, R S. Klessen, R. Wünsch and A. Gatto |
Jahr: | 2017 |
Jahr des Originals: | 2016 |
Umfang: | 23 S. |
Fussnoten: | Published: 29 November 2016 ; Gesehen am 07.06.2018 |
Titel Quelle: | Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society |
Ort Quelle: | Oxford : Oxford Univ. Press, 1827 |
Jahr Quelle: | 2017 |
Band/Heft Quelle: | 465(2017), 4, Seite 4611-4633 |
ISSN Quelle: | 1365-2966 |
Abstract: | Abstract: We present three-dimensional magneto-hydrodynamical simulations of the self-gravitating interstellar medium (ISM) in a periodic (256 pc)3 box with a mean number density of 0.5 cm−3. At a fixed supernova rate we investigate the multi-phase ISM structure, H2 molecule formation and density-magnetic field scaling for varying initial magnetic field strengths (0, 6 × 10−3, 0.3, 3 μG). All magnetic runs saturate at mass-weighted field strengths of ∼1-3 μG but the ISM structure is notably different. With increasing initial field strengths (from 6 × 10−3 to 3 μG) the simulations develop an ISM with a more homogeneous density and temperature structure, with increasing mass (from 5 to 85 per cent) and volume filling fractions (VFFs; from 4 to 85 per cent) of warm (300 < T < 8000 K) gas, with decreasing VFFs from ∼35 to ∼12 per cent of hot gas (T > 105 K) and with a decreasing H2 mass fraction (from 70 to < 1 per cent). Meanwhile, the mass fraction of gas in which the magnetic pressure dominates over the thermal pressure increases by a factor of 10, from 0.07 for an initial field of 6 × 10−3 μG to 0.7 for a 3 μG initial field. In all but the simulations with the highest initial field strength self-gravity promotes the formation of dense gas and H2, but does not change any other trends. We conclude that magnetic fields have a significant impact on the multi-phase, chemical and thermal structure of the ISM and discuss potential implications and limitations of the model. |
DOI: | doi:10.1093/mnras/stw3071 |
URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
kostenfrei: Volltext: http://dx.doi.org/10.1093/mnras/stw3071 |
| kostenfrei: Volltext: https://academic.oup.com/mnras/article/465/4/4611/2608772 |
| DOI: https://doi.org/10.1093/mnras/stw3071 |
Datenträger: | Online-Ressource |
Sprache: | eng |
K10plus-PPN: | 1564744396 |
Verknüpfungen: | → Zeitschrift |
¬The¬ impact of magnetic fields on the chemical evolution of the supernova-driven ISM / Pardi, Anabele-Linda [VerfasserIn]; 2017 (Online-Ressource)