The separation between gas and dust filaments at the edge of the expanding shell in Eridanus

Details The separation between gas and dust filaments at the edge of the expanding shell in Eridanus The separation between gas and dust filaments at the edge of the expanding shell in Eridanus

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390..514v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. 514-535. Research supported by U.S. Navy and N

Astronomy and Astrophysics

Astronomy

17

Cosmic Dust, Infrared Astronomy, Interstellar Extinction, Interstellar Gas, Ionized Gases, Astronomical Maps, H Alpha Line, H I Regions, Infrared Astronomy Satellite

Scientific paper

Observations obtained from IRAS for a 120 sq deg region at the boundary of a large expanding shell in Eridanus are presented. It is found that the separation between the structures in the H I and IR emission is not due to a transition of the gas into molecular hydrogen at the location of the IR filaments. The molecular hydrogen column density of these filaments is at least two orders of magnitude below what is typically seen in high-latitude molecular clouds. As the H I and dust in this region are associated with a large expanding shell (or superbubble), the action of shocks and radiation fields may be responsible for the separations of gas and dust. Unless the gas and dust structures are resolved and lie in a favorable viewing geometry, the effect tends to be hidden. The results indicate that it is not always evident, from observations with spatial resolutions coarser than a few arcminutes, how interstellar gas and dust are related.

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