Molecular gas Superwind from the face-on Wolf-Rayet galaxy Markarian 1259

摘要

We report the results of ~12CO (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(ΔV≌-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.