12CO (1-0) spectra for three positions in the dIrr galaxy
Positions 1 and 3 coincide with maxima in the H I column
density, where atomic gas with low velocity dispersion was detected.
Position 2 corresponds to the galaxy center, where there is a hole in
the H I distribution.
The upper spectrum for each position has a velocity resolution of
2.6 km s-1 (1 MHz);
the lower spectrum has been smoothed to 5.2 km s-1
A plot of log (L(CO)/M(H I)) versus
oxygen abundance for all the dwarf galaxies in the literature which have CO,
H I and oxygen abundance data available.
A trend for low metallicity galaxies to have only upper limits is shown,
with no dwarfs at metallicities less than 12 + log O/H =
7.9 detected in CO
Links (back/forward) to:
|First version: ||12th||August,||1998
|Last update: ||28th||September,||1998
Jochen M. Braun &