Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998stin...9945647o&link_type=abstract
Technical Report, NRO-457
Astronomy and Astrophysics
Astronomy
Starburst Galaxies, Radio Emission, Carbon Monoxide, Molecular Gases, Wolf-Rayet Stars, Stellar Winds, Supernovae, Line Spectra, Simulation, Velocity Distribution, Radio Astronomy
Scientific paper
We report results of 12CO (J = 1-0) mapping observations of the Wolf-Rayet starburst galaxy Mrk 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 blue-shifted (Delta V is approximately equal to -27 km s(sup -1)) broad (FWHM is approximately equal to 114 km s(sup -1)) component as well as the narrow one (FWHM is approximately equal to 68 km s(sup -1)). The off-nuclear CO spectra also show the single-peaked broad component (FWHM is approximately equal to 100 km s(sup -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 approximately 100 km s(sup -1). If this gas disk would be extended up to a few kpc 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 an 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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