Detection of neutral hydrogen in the planetary nebula IC 418

Details Detection of neutral hydrogen in the planetary nebula IC 418 Detection of neutral hydrogen in the planetary nebula IC 418

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...176l...5t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 176, no. 1, April 1987, p. L5-L8.

Astronomy and Astrophysics

Astronomy

30

Hydrogen Clouds, Neutral Gases, Planetary Nebulae, Radio Sources (Astronomy), Absorption Spectra, Centimeter Waves, Emission Spectra, Flow Velocity, Gas Expansion

Scientific paper

Sensitive observations of the 21-cm neutral hydrogen line toward the compact planetary nebula IC418 reveal an absorption feature at the velocity of the near side of the expanding nebula, plus an emission line red-shifted with respect to the system velocity. For a distance of 2 kpc, the emission line flux implies a total neutral hydrogen mass of 0.07 solar masses, similar to the mass of the central ionized nebula. If the neutral gas is undergoing symmetric outflow, the relative intensity of the emission and absorption features indicate a spin-excitation temperature of about 1000 K.

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