Exploring Faint, Large-Scale Filaments in the Warm Ionized Medium of the Galaxy

Details Exploring Faint, Large-Scale Filaments in the Warm Ionized Medium of the Galaxy Exploring Faint, Large-Scale Filaments in the Warm Ionized Medium of the Galaxy

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.4202m&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #42.02; Bulletin of the American Astronomical Society, Vol. 34, p.708

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used the Wisconsin Hα Mapper (WHAM) to investigate the properties of faint, large-scale Hα -emitting filaments in the warm ionized medium of the Galaxy. The recent WHAM Northern Sky Survey has revealed several of these remarkable features, some of which may extend over 1 kpc above the Galactic plane. In an effort to understand the origin and physical conditions of these structures, we have obtained optical emission line spectra toward a collection of filaments in Hα , Hβ , [N 2], [S 2], He 1, and [O 3]. These filaments include a 60o-long vertical structure which rises above the CMa R1 OB association in the plane, a horizontal feature that stretches 20o perpendicular to this larger filament, and an isolated filament extending 5o near the Lockman window at high Galactic latitude. The temperature, density, extinction, kinematics, and ionization state of these filaments, as revealed by their spectra, is discussed. We also compare the physical conditions within these filaments to classical H 2 regions and speculate on their origin. This work has been supported by the National Science Foundation through grant AST 96-19424.

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