NDLI: The contribution of ionizing starts to the far-infrared and radio emission in the milky way: evidence for a swept-up shell and diffuse ionized halo around the w4 chimney/supershell

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The contribution of ionizing starts to the far-infrared and radio emission in the milky way: evidence for a swept-up shell and diffuse ionized halo around the w4 chimney/supershell

Content Provider	NASA Technical Reports Server (NTRS)
Author	Terebey, Susan
Copyright Year	1999
Description	Normandeau have proposed that W4 is a galactic chimney, the only chimney to-date identified in our Galaxy. Using the recent approx. 1 min resolution IGA (Infrared Galaxy Atlas) and DRAO (Dominion Royal Astrophysical Observatory) CGPS (Canadian Galactic Plane Survey) galactic plane surveys we analyze the far-infrared and radio structure of the W 4 chimney/supershell. We show W4 has a swept-up partially ionized shell of gas and dust which is powered by the OCl 352 star cluster. Analysis of the dust column density establishes there is dense interstellar material below the shell, directly showing the dense material which caused the lower shell expansion to stall. Due to much lower densities above the Galactic plane, the upper W4 shell achieved 'breakout' to form a Galactic chimney. Although the shell appears ionization bounded, it is very inhomogenous and an ionized halo provides evidence of significant Lyman continuum leakage. A large fraction of the OCl 352 cluster photons escape to large distances and are available to ionize the WIM (warm ionized medium) component of the interstellar medium.
File Size	927016
Page Count	21
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20030015719
Archival Resource Key	ark:/13960/t7np70v68
Language	English
Publisher Date	1999-12-18
Access Restriction	Open
Subject Keyword	Astrophysics Far Infrared Radiation Radio Emission Galactic Structure Ionized Gases Radio Astronomy Ionization Infrared Astronomy Sky Surveys Astronomy Star Clusters Interstellar Matter Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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