CO emission along the anomalous arms of NGC 4258

Details CO emission along the anomalous arms of NGC 4258 CO emission along the anomalous arms of NGC 4258

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233l...1k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 1, July 1990, p. L1-L4. Research supported by the Alexander von Humbo

Astronomy and Astrophysics

Astrophysics

33

Carbon Monoxide, Emission Spectra, Galactic Structure, Interstellar Matter, Molecular Gases, Charge Coupled Devices, H Alpha Line, Imaging Techniques, Radio Galaxies, Vibrational Spectra

Scientific paper

CO observations of NGC 4258 made with the IRAM 30-meter telescope are presented. CO emission has been detected toward NGC 4258 in the central region and along the anomalous arms up to distances of about 2 kpc from the center. Cuts perpendicular to the anomalous arms show that the CO is concentrated along the H-alpha emission. At distances greater than 2 kpc, no CO has been detected neither along the extensions of the optical structures nor further out along the radio ridges. The molecular mass associated with each anomalous arm is estimated to be about 3 x 10 to the 8th solar masses. The strong concentration of the molecular gas in the inner parts of the H-alpha arms and the high associated H2 mass are facts which are not expected by any existing model.

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