HII Structures in the Middle Disk of M31

Details HII Structures in the Middle Disk of M31 HII Structures in the Middle Disk of M31

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.4312a&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #43.12; Bulletin of the American Astronomical Society, Vol. 28, p.890

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a deep, narrow-band Hα + [N II] image that shows a variety of emission line objects in the middle disk of M31 along the minor axis. The observations were obtained with the WIYN 3.5-m telescope under excellent conditions with 0.7 arcsec FWHM images. These data include the large HII regions 405 and 406, catalogued by Baade & Arp (1964, ApJ, 139, 1027) in the main star-forming ring of M31, as well as smaller HII regions in the inner disk. In addition several faint, large ionized shells and numerous unresolved sources are present. We analyze the symmetries of larger ionized structures as a means to search for the effects of an anisotropic pressure component that could be produced by an organized, large-scale magnetic field. The taxonomy of ionized structures in this part of M31 also is briefly summarized.

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