Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..145m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, no. 1, Oct. 1986, p. 145-150.
Astronomy and Astrophysics
Astronomy
49
Cassiopeia A, Crab Nebula, Interstellar Matter, Radio Astronomy, Supernova Remnants, Synchrotron Radiation, Astronomical Maps, Millimeter Waves, Radio Spectra
Scientific paper
The paper presents 1.2 mm contour maps of the SNRs Cassiopeia A and Taurus A (Crab Nebula), obtained with the MPIfR bolometer using the IRTF 3-m and UH 88-in. telescopes on Mauna Kea, with angular resolutions of 90 and 120 arcsec, respectively. These maps are compared with maps at 2.8 cm made with the 100-m telescope and smoothed to the same angular resolution. There is no significant variation in the distribution of surface brightness between 1.2 mm and 2.8 cm for either source, suggesting that in each case the 1.2 mm emission is dominated by synchrotron emission. The synchrotron spectra of both SNRs at millimeter wavelengths are determined by combining the 1.2 mm integrated flux densities with previous measurements at longer wavelengths. Within the error bars the 1.2 mm integrated flux density derived for the Crab Nebula agrees with the synchrotron spectrum of Baars et al. (1977) as extrapolated to 1.2 mm, but that derived for Cas A lies above this extrapolation.
Chini Rolf
Gemuend Hans-Peter
Kreysa Ernst
Mezger Peter G.
Tuffs Richard. J.
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