Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...367..635f&link_type=abstract
Astronomy and Astrophysics, v.367, p.635-651 (2001)
Astronomy and Astrophysics
Astrophysics
6
Hii Regions, Radio Continuum: Ism, Radio Lines: Ism, Ism: Jets And Outflows, Ism: Individual Objects: Nrao 655
Scientific paper
We present new Canadian Galactic Plane Survey radio continuum and λ 21 cm HI line observations of NRAO 655 (G93.4+1.8), plus radio recombination line observations, and optical Hα-line observations. The radio spectrum of NRAO 655 confirms its emission as thermal. From the λ 21 cm HI data we find an atomic hydrogen cavity associated with this object at v ≃ -71.5 km s-1. The cavity corresponds in position and size to the brightest radio continuum emission from NRAO 655. The corresponding kinematic distance is 8.8 kpc, placing NRAO 655 in the Perseus Arm. NRAO 655's linear size is therefore 70 pc × 130 pc. To confirm the λ 21 cm HI velocity we present the first recombination line detection of NRAO 655 (H158 α line, v eq -71 km s-1, and the first observations of a molecular cloud coinciding with NRAO 655 (at v ≃ -72 km s-1. The first optical detection of λ 656 nm Hα emission line features in NRAO 655 is also presented, and the Hα emission line brightness is determined. We suggest that the eastward extension of this strongly asymmetric object originates in a champagne outflow, and we estimate its age. We show that a single early-type star cannot be responsible for the outflow, whereas a group of later-type stars would suffice. A partial HI shell is seen adjacent to the brightest part of NRAO 655; we suggest that it has been formed by dissociation of H2 in the molecular cloud.
Foster Tyler
Routledge D.
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