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The Relationship Between Gas and Cirrus Dust Filaments at the Edge of the Expanding Shell in Eridanus

Published online by Cambridge University Press:  08 February 2017

G. L. Verschuur ,
F. Verter ,
L. J. Rickard  and
D. T. Leisawitz
G. L. Verschuur
Affiliation:
Unaffiliated, USA
F. Verter
Affiliation:
Laboratory for Astronomy Goddard Space Flight Center, USA
L. J. Rickard
Affiliation:
Naval Research Laboratory, USA
D. T. Leisawitz
Affiliation:
Laboratory for Astronomy Goddard Space Flight Center, USA

Abstract

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At the boundary of a large expanding shell in Eridanus around l = 187°, b = −50° the morphology observed in the HI emission is well mimicked by the 100 μm surface brightness but with associated structures offset by as much as 0.°5. A point-to-point comparison between I100μm and NHI in filaments of neutral hydrogen and dust (IR cirrus) produces only a weak dependence. However, when I100μm at a cirrus dust peak is compared with NHI at the associated H i peak, a relationship closer to that reported by other workers is found. Preliminary CO observations have set low limits on the molecular gas in these filaments. Since the H i and dust in our region are associated with a large expanding shell (or superbubble), shocks may be responsible for separation of gas and dust. The existence of small-scale structure in both the HI and IR is noted. We conclude that attempts to correlate HI and IR must invoke high-resolution area surveys.

Type
III. Diffuse Galactic Radiation from Dust and Gas: Observations and Models
Information
Symposium - International Astronomical Union , Volume 139: The Galactic and Extragalactic Background Radiation , 1990 , pp. 235 - 236
Copyright
Copyright © Kluwer 1990 

References

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