THE IMPACT OF GAS BULK ROTATION ON THE Lyα LINE

We present results of radiative transfer calculations to measure the impact of gas bulk rotation on the morphology of the Ly alpha emission line in distant galaxies. We model a galaxy as a sphere with an homogeneous mixture of dust and hydrogen at a constant temperature. These spheres undergo solid-...

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Bibliographic Details
Published in:The Astrophysical journal 2014-11, Vol.795 (2), p.1-12
Main Authors: Garavito-Camargo, Juan N, ero-Romero, Jaime E, Dijkstra, Mark
Format: Article
Language:English
Subjects:
ANISOTROPY
APPROXIMATIONS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Constants
DISTRIBUTION
DOPPLER EFFECT
EMISSION
GALAXIES
HYDROGEN
Line of sight
LINE WIDTHS
LYMAN LINES
Mathematical analysis
Mathematical models
Morphology
RADIANT HEAT TRANSFER
RED SHIFT
ROTATION
SCATTERING
SOLIDS
SPECTRA
VELOCITY
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Summary:We present results of radiative transfer calculations to measure the impact of gas bulk rotation on the morphology of the Ly alpha emission line in distant galaxies. We model a galaxy as a sphere with an homogeneous mixture of dust and hydrogen at a constant temperature. These spheres undergo solid-body rotation with maximum velocities in the range 0-300 km s super(-1) and neutral hydrogen optical depths in the range [tau] sub(H) = 10 super(5)-10 super(7). We consider two types of source distributions in the sphere: central and homogeneous. Our main result is that rotation introduces a dependence of the line morphology with viewing angle and rotational velocity. Observations with a line of sight parallel to the rotation axis yield line morphologies similar to the static case. For lines of sight perpendicular to the rotation axis, both the intensity at the line center and the line width increase with rotational velocity. Along the same line of sight, the line becomes single peaked at rotational velocities close to half the line width in the static case. Notably, we find that rotation does not induce any spatial anisotropy in the integrated line flux, the escape fraction or the average number of scatterings. This is because Lyman scattering through a rotating solid-body proceeds identically to the static case. The only difference is the Doppler shift from the different regions in the sphere that move with respect to the observer. This allows us to derive an analytic approximation for the viewing-angle dependence of the emerging spectrum, as a function of rotational velocity.
ISSN:1538-4357
0004-637X
1538-4357
DOI:10.1088/0004-637X/795/2/120