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Turbulence in simulated H II regions
KTH, Centra, Nordic Institute for Theoretical Physics NORDITA.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 445, nr 2, s. 1797-1819Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We investigate the scale dependence of fluctuations inside a realistic model of an evolving turbulent H II region and to what extent these may be studied observationally. We find that the multiple scales of energy injection from champagne flows and the photoionization of clumps and filaments leads to a flatter spectrum of fluctuations than would be expected from top-down turbulence driven at the largest scales. The traditional structure function approach to the observational study of velocity fluctuations is shown to be incapable of reliably determining the velocity power spectrum of our simulation. We find that a more promising approach is the Velocity Channel Analysis technique of Lazarian & Pogosyan (2000), which, despite being intrinsically limited by thermal broadening, can successfully recover the logarithmic slope of the velocity power spectrum to a precision of +/- 0.1 from high-resolution optical emission-line spectroscopy.

sted, utgiver, år, opplag, sider
2014. Vol. 445, nr 2, s. 1797-1819
Emneord [en]
hydrodynamics, turbulence, H II regions, ISM: kinematics and dynamics
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-159027DOI: 10.1093/mnras/stu1862ISI: 000346959400061OAI: oai:DiVA.org:kth-159027DiVA, id: diva2:785704
Merknad

QC 20150203

Tilgjengelig fra: 2015-02-03 Laget: 2015-01-20 Sist oppdatert: 2017-12-05bibliografisk kontrollert

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