High-resolution far-infrared observations of the Ring Nebula

Details High-resolution far-infrared observations of the Ring Nebula High-resolution far-infrared observations of the Ring Nebula

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...425..687z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 425, no. 2, p. 687-694

Astronomy and Astrophysics

Astronomy

4

Far Infrared Radiation, Infrared Astronomy, Interstellar Matter, Planetary Nebulae, Bolometers, Emission Spectra, Gas Ionization, Kuiper Airborne Observatory, Lyman Alpha Radiation, Space Observations (From Earth), Spatial Resolution

Scientific paper

High spatial resolution 50 and 100 micron observations of the Ring Nebula reveal a far-infrared emission peak close to the center of the nebula where atomic and molecular emission is at a minimum. Dust in this central peak emission region is heated by direct absorption of radiation from the central star. While the dust temperature in the central peak region is about 50 K (dust emissivity index of 1.5), the temperature of the bulk of the dust located in the regions of the ionized nebular core and the neutral molecular gas is on average lower than 50 K. Ly(alpha) photons are sufficient for heating the dust grains within the nebular core. Far-infrared emission is also found from grains mixed with the molecular gas outside the main ionized nebular core.

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