Far-infrared emission line and continuum observations of NGC 7027

Details Far-infrared emission line and continuum observations of NGC 7027 Far-infrared emission line and continuum observations of NGC 7027

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..170m&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 170-174.

Astronomy and Astrophysics

Astronomy

17

Far Infrared Radiation, Infrared Astronomy, Infrared Spectra, Oxygen Spectra, Planetary Nebulae, Continuous Radiation, Cosmic Dust, Fine Structure

Scientific paper

The first observation of a fine-structure transition in NGC 7027 at wavelengths greater than 30 microns is reported. The flux in the 63.2-micron line is found to be approximately 10 to the -16th W/sq cm. It is noted that if NGC 7027 lies at 1 kpc, this corresponds to a luminosity, in the line, approximately 30 times greater than the solar luminosity. The flux of the 88.35-micron line is less than 10 to the -17th W/sq cm, and the upper limit to the line flux at 51.8 microns is found to be 10 to the -16th W/sq cm. These upper limits imply an electron density that is less than 1.6 x 10 to the 5th/cu cm. It is noted that the continuum measurements obtained support a dust temperature of 90 K with an emissivity approximately equal to the reciprocal of the square of the wavelength. The data exclude grain materials whose wavelength-dependent emissivity (the reciprocal of the wavelength raised to nth power) requires n to be outside the range between 1.6 and 2, unless the temperature varies drastically across the dust cloud

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