Molecular gas in M2-9, the Butterfly nebula

Details Molecular gas in M2-9, the Butterfly nebula Molecular gas in M2-9, the Butterfly nebula

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..188b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 1, Jan. 1990, p. 188-190. Research supported by CAICYT.

Astronomy and Astrophysics

Astronomy

13

Astronomical Photography, Infrared Astronomy, Molecular Clouds, Planetary Nebulae, Carbon Monoxide, Photodissociation, Radio Telescopes

Scientific paper

CO (J = 2 - 1) mapping is presented of M2-9, the Butterfly nebula, with high angular resolution. The profile observed towards the nucleus of the nebula exhibits two peaks at LSR velocities of 76 and 85 km/s. Although the CO envelope is essentially unresolved, the observations are well explained by assuming that the molecular gas is distributed in a ring of diameter 10 arcsec or less, whose kinematical age is less than 3500 yr (for a distance of 1 kpc). The mass of the molecular gas in M2-9 is greater than 0.001 solar mass, i.e., comparable to the mass of the ionized gas in nebula.

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