Comparisons of Diffuse Ionized and Neutral Hydrogen in the Galaxy

Details Comparisons of Diffuse Ionized and Neutral Hydrogen in the Galaxy Comparisons of Diffuse Ionized and Neutral Hydrogen in the Galaxy

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0803t&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #08.03; Bulletin of the American Astronomical Society, Vol. 25, p.804

Astronomy and Astrophysics

Astronomy

Scientific paper

We compare velocity resolved maps of the diffuse Galactic H_α emission over a 10() o times12 () o degree region of the sky centered near l= 144() o, b= --21() o (cf. Reynolds 1980) with corresponding maps from 21 cm data taken with the Hat Creek 85-foot telescope (now destroyed). The H_α maps have about 1() o angular resolution and display the intensity distribution down to an effective emission measure of 1--2 cm(-6) pc for a series of seven narrow (12 km s(-1) ) radial velocity intervals between --76 and +8 km s(-1) (LSR). From 21 cm data the corresponding H I column density is mapped in the same velocity intervals allowing direct comparison of neutral and ionized hydrogen in the diffuse interstellar medium at high latitude. We find both correlations and anti-correlations between the H_α and 21 cm emission regions. In particular, a ~ 15() o long, high-velocity filament and an =~ 11() o diameter ring are analyzed. We also compare a 3(') resolution narrow band H_α image with Aricebo 21 cm data covering the same spatial and spectral regions ( ~ 1() o times 1() o and --76 to --64 km s(-1) ).

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