Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279l..41c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 2, p. L41-L44
Astronomy and Astrophysics
Astronomy
11
Accretion Disks, Carbon Monoxide, Galactic Evolution, Galactic Rotation, Interstellar Gas, Molecular Spectra, Radio Astronomy, Spiral Galaxies, Astronomical Spectroscopy, Carbon 12, Carbon 13, Dwarf Galaxies, Hydrogen Compounds, Iodides, Line Spectra, Radio Spectra, Radio Telescopes
Scientific paper
We present (12)CO and (13)CO observations of the 'Black Eye' galaxy, NGC 4826, in the J = 1-0 and J = 2-1 lines, made with the IRAM 30m telescope. The molecular gas, 2 x 108 solar mass in total, is confined to the inner 1.8 kpc radius of the galaxy and rotates in a regular way, following the kinematics of the ionized gas and old stars. Its rotation is thus in the sense opposite to that of the outer HI gas. The 2-1/1-0 and the (12)CO/13(CO) line ratios are comparable to those of normal spirals. These data support the hypothesis that the inner gas and stars actually trace the general rotation of the galaxy, and that the outer HI gas has been accreted from a gas-rich dwarf companion.
Casoli Fabienne
Gerin Maryvonne
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