Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..168f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. 168-181. Research supported by University of Toronto
Astronomy and Astrophysics
Astronomy
40
Ionized Gases, Milky Way Galaxy, O Stars, Pulsars, Radio Sources (Astronomy), Absorption Spectra, Astronomical Spectroscopy, Interstellar Matter, Stellar Models, Very Large Array (Vla)
Scientific paper
Neutral hydrogen (H I) absorption measurements at 21 cm toward 15 pulsars with the Arecibo 305 m telescope and the VLA are reported. A study of the radial distribution of the diffuse ionized medium has been carried out using mean electron density measurements made toward pulsars. With these new measurements and those from the literature, there are a total of 18 lines of sight that sample the electron density at small galactocentric radii. The data show a clear rise in the electron density in the inner Galaxy, to about three times the local average. From this and other evidence, it is argued that O stars are the principal heating agent of the warm ionized medium.
Cordes James M.
Frail Dale A.
Hankins Timothy H.
Weisberg Joel M.
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