Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..147m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 1, 1990, p. 147-152.
Astronomy and Astrophysics
Astrophysics
58
Disk Galaxies, Extragalactic Radio Sources, H Ii Regions, Molecular Clouds, Plasma Turbulence, Very Large Array (Vla), Line Of Sight, Line Spectra, Scattering, Star Formation
Scientific paper
At centimeter wavelengths, the angular size of NGC 6334B increases as the square of the wavelength, suggesting that plasma scattering broadens the image. This source, which has a size of 3 arcsec at 20 cm wavelength, has the largest known scattering disk. Spectral line observations of neutral hydrogen and continuum observations at 20, 6, and 2 cm wavelength made with the VLA are presented that improve current knowledge of this unusual source and its scattering agent. The measurements of H I in absorption indicate that NGC 6334B is much more distant than the NGC 6334 H II region-molecular cloud complex. NGC 6334B is probably an extragalactic source whose line of sight passes through the star-forming region. The fringe visibility as a function of baseline length at 6 cm wavelength is accurately modeled by a Gaussian function, as expected for scattering by a turbulent plasma with a Gaussian spectrum or with a power-law spectrum and spectral index of 4 or an arbitrary index with an inner length scale greater than 35 km.
Backer Donald C.
Greene Brian
Moran James Michael
Rodriguez Luis F.
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