SIMBAD references

2001ApJ...558L.101R - Astrophys. J., 558, L101-L104 (2001/September-2)

Detection of a large arc of ionized hydrogen far above the Cassiopeia OB6 association: a superbubble blowout into the galactic halo.


Abstract (from CDS):

The Wisconsin Hα Mapper Northern Sky Survey has revealed a loop of H II reaching 1300 pc from the Galactic midplane above the Cassiopeia OB6 association in the Perseus spiral arm. This enormous feature surrounds and extends far above the ``W4 chimney'' identified by Normandeau, Taylor, and Dewdney and appears to be associated with the star formation activity near the W3/W4/W5 H II region complex. The existence of this ionized structure suggests that past episodes of massive star formation have cleared the H I from an enormous volume above the Perseus arm, allowing Lyman continuum photons from O stars near the Galactic midplane to reach into the halo.

Abstract Copyright:

Journal keyword(s): Galaxies: Halos - Galaxies: ISM - ISM: H II Regions - ISM: Bubbles - ISM: General - ISM: Structure

Simbad objects: 6

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