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Record Details

Record 99 of 2818
The distribution of warm ionized gas in NGC 891
External Online Source: doi:10.1086/185679
Author and Affiliation:
Rand, Richard J.(California Inst. of Tech., Pasadena, CA, United States)
Kulkarni, Shrinivas R.(California Institute of Technology, Pasadena, United States)
Hester, J. Jeff(JPL, Infrared Processing and Analysis Center)
Abstract: Narrow-band imaging is presented of the edge-on spiral NGC 891 in the H-alpha and S II 6716, 6731 A forbidden lines. Emission from H II regions confined to the plane of the galaxy and from diffuse gas up to about 4 kpc off the plane is readily detected. The full radial extent of the diffuse emission in the plane is about 30 kpc. NGC 891 is found to have a surface density of diffuse ionized gas twice the Galactic value, a thicker ionized gas layer, and a larger surface density of ionized gas relative to neutral gas. These are interpreted as consequences of a relatively high level of star formation in this galaxy. Other star formation tracers indicate the same conclusion. Many vertical H-alpha filaments, or 'worms,' extending to over 2 kpc off the plane of the galaxy are seen. These worms are interpreted in terms of chimney models for the interstellar media of spirals.
Publication Date: Mar 20, 1990
Document ID:
19900041004
(Acquired Nov 28, 1995)
Accession Number: 90A28059
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 352; L1-L4
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: California Inst. of Tech.; Pasadena, CA, United States
Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: INTERSTELLAR GAS; ION DISTRIBUTION; IONIZED GASES; LINE SPECTRA; SPIRAL GALAXIES; STAR FORMATION; GALACTIC RADIATION; H ALPHA LINE; H II REGIONS; HALOS; MILKY WAY GALAXY
Imprint And Other Notes: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 352, March 20, 1990, p. L1-L4. Research supported by the Infrared Processing and Analysis Center and California Institute of Technology.
Miscellaneous Notes: Research supported by the Infrared Processing and Analysis Center and California Institute of Technology
Availability Source: Other Sources
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