A rotating molecular disc in the megamaser III ZW 35

Details A rotating molecular disc in the megamaser III ZW 35 A rotating molecular disc in the megamaser III ZW 35

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254p..23m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Feb. 1, 1992, p. 23P-26P.

Astronomy and Astrophysics

Astronomy

23

Galactic Nuclei, Hydroxyl Emission, Interstellar Masers, Radio Jets (Astronomy), Abundance, Continuous Radiation, Hydroxyl Radicals, Luminosity

Scientific paper

MERLIN observations are presented of the 18-cm continuum and OH megamaser emission from III Zw 35. The OH megamaser is the most compact yet mapped, with a projected size of only 100 pc, and coincides with the radio nucleus. It shows the characteristic signature of a rotating nuclear disk, namely a strong gradient of velocity with position, centered on the optical redshift of the galaxy. The major axis of the disk is misaligned by 40 deg with respect to the optical image of the galaxy. The OH maser output per unit volume is the highest known for any megamaser, and probably requires an enhanced OH abundance of at least nOH/nH2 of about 0.00001.

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