Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21320406m&link_type=abstract
American Astronomical Society, AAS Meeting #213, #204.06; Bulletin of the American Astronomical Society, Vol. 41, p.267
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The HST/NICMOS Paschen-alpha images of HII regions near the Galactic center show abundant fine-scale filamentation that is unprecedented in its detail. We attribute the morphology to organization by the presumably strong and uniform magnetic field known to be present in the molecular clouds underlying the HII regions. The distribution and orientation of the filaments provide clues to how the interaction of the stellar winds and UV radiation field of stars in the massive Arches and Quintuplet clusters with nearby molecular clouds is mediated by the magnetic field. The filamentation takes the form of compressed ridges where the field is parallel to ionized cloud surfaces, and to magnetic fingering instabilities where the field is oriented perpendicular to the shocked and compressed cloud surface. In a few locations, the Paschen-alpha filaments appear to be responding to the intercloud magnetic field, oriented perpendicular to the Galactic plane.
HST Palpha GC Survey Team
Morris Mark
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