Interactions Between a Jet and Molecular Clouds in Spiral Galaxy NGC 4258

Details Interactions Between a Jet and Molecular Clouds in Spiral Galaxy NGC 4258 Interactions Between a Jet and Molecular Clouds in Spiral Galaxy NGC 4258

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adil...rp...05p&link_type=abstract

NCSA Astronomy Digital Image Library

Astronomy and Astrophysics

Astronomy

Astronomical Maps, Carbon Monoxide, H Alpha Line, Interactions, Interstellar Gas, Interstellar Matter, Light Emission, Microwave Interferometers, Millimeter Waves, Molecular Clouds, Plasma Jets, Radio Emission, Radio Jets (Astronomy), Spiral Galaxies

Scientific paper

The SABbc spiral galaxy NGC 4258 is known for its anomalous arms believed to be indicative of nuclear activity, possibly resulting in twin jets. In this study, we compare radio images of CO (J=1-0) emission from the galactic nucleus with optical images of H-alpha and red continuum. The CO emission is found to arise from a ring-like structure, and the bulk of the detected CO appears to coincide with dust features seen in optical continuum. The CO distribution also appears to confine the inner part of the anomalous H-alpha arm in NGC 4258. To account for the unusual velocity field of the CO emission, we obtain a simple kinematic model for the motion of the molecular gas that superimposes expansion away from the galaxy's center on top of elliptical motion. We identify a feature in the CO emission whose motion is perturbed with respect to this model and suggest that this deviation is evidence for a deflection of the line-emitting jet by a dense molecular cloud.

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