Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...498l..27o&link_type=abstract
Astrophysical Journal Letters v.498, p.L27
Astronomy and Astrophysics
Astronomy
5
Galaxies: Individual Name: Markarian 1259, Galaxies: Starburst, Ism: Molecules
Scientific paper
We report the results of 12 CO ( J=1-0 ) mapping observations of the Wolf-Rayet starburst galaxy Markarian 1259, which has optical evidence for the superwind seen from a nearly pole-on view. The CO emission is detected in the central 4 kpc region. The nuclear CO spectrum shows a blueshifted ( Delta V~=-27 km s ^{-1} ) broad ( {FWHM}~=114 km s ^{-1} ) component as well as a narrow one ( {FWHM}~=68 km s ^{-1} ). The off-nuclear CO spectra also show the single-peaked broad component ( {FWHM}~=100 km s ^{-1} ). The single-peaked CO profiles of both the nuclear and off-nuclear regions may be explained if we introduce a CO gas disk with a velocity dispersion of ~100 km s ^{-1} . If this gas disk were extended up to a few kiloparsecs in radius, we may explain the wide line widths of the off-nuclear CO emission. Alternatively, we may attribute the off-nuclear CO emission to the gas associated with the superwind. However, if all the CO gas moves along the biconical surface of the superwind, the CO spectra would show double-peaked profiles. Hence, the single-peaked CO profiles of the off-nuclear regions may be explained by the idea that the morphology and/or velocity field of the molecular gas superwind are more complex, as suggested by hydrodynamical simulations.
Ohyama Youichi
Taniguchi Yoshiaki
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