Título
A two-component power law covering nearly four orders of magnitude in the power spectrum of spitzer far-infrared emission from the large magellanic cloud
Autor
Ivanio Puerari
Nivel de Acceso
Acceso Abierto
Materias
Resumen o descripción
Power spectra of Large Magellanic Cloud (LMC) emission at 24, 70 and 160 μm observed with the Spitzer Space Telescope have a two-component power-law structure with a shallow slope of −1.6 at low wavenumber, 𝑘, and a steep slope of −2.9 at high 𝑘. The break occurs at 𝑘⁻¹~100− 200 pc, which is interpreted as the line-of-sight thickness of the LMC disk. The slopes are slightly steeper for longer wavelengths, suggesting the cooler dust emission is smoother than the hot emission. The power spectrum covers ~ 3.5 orders of magnitude and the break in the slope is in the middle of this range on a logarithmic scale. Large-scale driving from galactic and extragalactic processes, including disk self-gravity, spiral waves and bars, presumably cause the low- 𝑘 structure in what is effectively a two-dimensional geometry. Small-scale driving from stellar processes and shocks cause the high-k structure in a 3D geometry. This transition in dimensionality corresponds to the observed change in power spectrum slope. A companion paper models the observed power-law with a self-gravitating hydrodynamics simulation of a galaxy like the LMC.
Editor
The Astrophysical Journal Letters
Fecha de publicación
2010
Tipo de publicación
Artículo
Versión de la publicación
Versión aceptada
Recurso de información
Formato
application/pdf
Idioma
Inglés
Audiencia
Estudiantes
Investigadores
Público en general
Sugerencia de citación
Block, David L., et al., (2010), A two-component power law covering nearly four orders of magnitude in the power spectrum of spitzer far-infrared emission from the large magellanic cloud, The Astrophysical Journal Letters, Vol. 718(1):1-15
Repositorio Orígen
Repositorio Institucional del INAOE
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