NGC 3628: The Nuclear Molecular Disk and Expanding Molecular Shells

Details NGC 3628: The Nuclear Molecular Disk and Expanding Molecular Shells NGC 3628: The Nuclear Molecular Disk and Expanding Molecular Shells

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...464..738i&link_type=abstract

Astrophysical Journal v.464, p.738

Astronomy and Astrophysics

Astronomy

29

Galaxies: Individual Ngc Number: Ngc 3628, Galaxies: Ism, Galaxies: Kinematics And Dynamics, Galaxies: Nuclei, Galaxies: Starburst, Radio Lines: Galaxies

Scientific paper

CO emission from the nucleus of the edge-on starburst galaxy, NGC 3628 has been observed with the Nobeyama Millimeter-Wave Array at 125 pc resolution. Three main components are observed: a strongly centrally concentrated nuclear molecular disk with a steep velocity gradient, an offset low velocity gradient ridge, and numerous features indicative of expansion. The nuclear molecular disk, which dominates the emission, is centered at the nucleus of the galaxy which corresponds to the radio continuum peak. The CO spectra in the nuclear disk have been reproduced with an exponentially declining density distribution of radial scale length of 228 pc, a vertical scale height of 49 pc, and a velocity dispersion of 36-45 km s^-1^. Energy input from embedded star-forming activity can account for the observed velocity dispersion. Four expanding shells have been identified with kinetic energies of order 10^52^-10^54^ ergs, mostly associated with the low velocity gradient ridge outside of the nuclear disk. The shells appear to have arisen in a single starburst which has occurred within the last few x 10^6^ yr. CO extensions are observed out to 430 pc from the plane as well as a CO velocity cone opening away from the disk toward the north, suggesting that molecular disk-halo outflow is occurring. The most obvious outflow feature is situated ~20" to the west of the nucleus, which corresponds to the apparent origin of the kiloparsec-scale southern Hα plume.

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