Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Watson, W. D."'
Autor:
Wiebe, D. S., Watson, W. D.
Publikováno v:
Astrophys.J.655:275-284,2007
The anisotropy of velocities in MHD turbulence is demonstrated explicitly by calculating the velocity gradients as a function of direction in representative simulations of decaying turbulence. It follows that the optical depths of spectral lines are
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610144
Publikováno v:
Astrophys.J. 628 (2005) 780-788
We present polarization observations in DR21(OH) from thermal dust emission at 3 mm and from CO J=1-0 line emission. The observations were obtained using the Berkeley-Illinois-Maryland Association array. Previous observations of this region at 1.3 mm
Externí odkaz:
http://arxiv.org/abs/astro-ph/0504258
Irregular Magnetic Fields and the Far-Infrared Polarimetry of Dust Emission from Interstellar Clouds
Autor:
Wiebe, D. S., Watson, W. D.
Publikováno v:
Astrophys.J. 615 (2004) 300-314
(abridged) The polarized thermal radiation at far infrared and submillimeter wavelengths from dust grains in interstellar clouds with irregular magnetic fields is simulated. We show that the polarization properties of quiescent clouds and of star-for
Externí odkaz:
http://arxiv.org/abs/astro-ph/0407496
Autor:
Watson, W. D., Wyld, H. W.
Publikováno v:
Astrophys.J.598:357-368,2003
Calculations are performed for the spectral line profiles and images of astrophysical maser radiation that emerges from isolated spheres and thin disks viewed edge-on. In contrast to previous investigations where various approximations are made, the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0307541
Calculations are performed to demonstrate the deviations from Gaussian that occur in the spectral line profiles of a linear maser as a result of the amplification process. Near-Gaussian profiles are presented for bright, interstellar 22 GHz water mas
Externí odkaz:
http://arxiv.org/abs/astro-ph/0204137
Autor:
Watson, W. D., Wyld, H. W.
The relationship between the magnetic field and the circular polarization of astrophysical maser radiation due to the Zeeman effect under idealized conditions is investigated when the Zeeman splitting is much smaller than the spectral linebreadth and
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107599
Autor:
Watson, W. D., Wiebe, D. S.
Calculations are performed for the circular polarization of maser radiation from a turbulent, Keplerian disk that is intended to represent the sub-parsec disk at the nucleus of the galaxy NGC4258. The polarization in the calculations is a result of t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0104360
Autor:
Wiebe, D. S., Watson, W. D.
Calculations are performed for the linear polarization of starlight due to extinction by aligned dust grains when the starlight traverses a medium with irregular magnetic fields. This medium is intended to represent the optically thick components of
Externí odkaz:
http://arxiv.org/abs/astro-ph/0012301
The strengths of magnetic fields in interstellar gas clouds are obtained through observations of the circular polarization of spectral line radiation. Irregularities in this magnetic field may be present due to turbulence, waves or perhaps other caus
Externí odkaz:
http://arxiv.org/abs/astro-ph/0010276
Autor:
Wiebe, D. S., Watson, W. D.
The linear polarization that is observed, together with likely changes in the orientation of the magnetic field along the line of sight and hence of the optical axes of the medium, can lead to the circular polarization that is observed in the radiati
Externí odkaz:
http://arxiv.org/abs/astro-ph/9806155