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http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1559| 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 | |
| Ivanio Puerari | |
| Acceso Abierto | |
| Atribución-NoComercial-SinDerivadas | |
| ISM: structure Galaxies: ISM Magellanic Clouds Infrared: ISM | |
| 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. | |
| The Astrophysical Journal Letters | |
| 2010 | |
| Artículo | |
| Inglés | |
| Estudiantes Investigadores Público en general | |
| 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 | |
| ASTRONOMÍA Y ASTROFÍSICA | |
| Versión aceptada | |
| acceptedVersion - Versión aceptada | |
| Aparece en las colecciones: | Artículos de Astrofísica |
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