The Overlooked H II Region DA 568

Details The Overlooked H II Region DA 568 The Overlooked H II Region DA 568

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....127.1059k&link_type=abstract

The Astronomical Journal, Volume 127, Issue 2, pp. 1059-1068.

Astronomy and Astrophysics

Astronomy

2

Catalogs, H Ii Regions, Ism: Individual (Da 568), Surveys

Scientific paper

During the inspection of Canadian Galactic Plane Survey 1420 MHz continuum images of the outer Galaxy we have rediscovered the large, bright, H II region DA 568. Intriguingly, this region does not appear in any of the commonly used catalogs of H II regions and radio sources in the outer Galaxy. After demonstrating how DA 568 was essentially overlooked, we present new radio, infrared, and molecular line observations of the region. We show that, far from being a minor overlooked H II region, DA 568 is actually the most prominent part of a much larger star-forming complex in the Perseus arm of our Galaxy. The complex spans ~45×20 pc, contains over 104 Msolar of ionized and molecular gas, and includes the BFS 10 H II region and numerous associated IRAS sources. The star-forming complex is apparently quite evolved with most of the original giant molecular cloud having been severely disrupted by the action of DA 568.

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