Nuclear star formation on 100 parsec scales: 10" resolution radio continuum, HI and CO observations

Details Nuclear star formation on 100 parsec scales: 10" resolution radio continuum, HI and CO observations Nuclear star formation on 100 parsec scales: 10" resolution radio continuum, HI and CO observations

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nascp2466..383t&link_type=abstract

Star formation in galaxies, Proceedings of a conference at the California Institute of Technology, Pasadena, California, June 16

Computer Science

3

High Temperature Gases, Ionized Gases, Neutral Gases, Radio Emission, Spiral Galaxies, Star Formation, Angular Resolution, Carbon Monoxide, Galactic Nuclei, Nonthermal Radiation, Radio Bursts, Star Distribution, Stellar Spectra, Thermal Emission

Scientific paper

A program of radio line and continuum studies of star formation in nearby spiral galaxies is reported. The objective is a search for hot gas and peculiar dynamics in spiral nuclei with 10" to 30" angular resolution. Vigorous star formation is found to be a common phenomenon in the inner kpc of spirals. Arcsecond resolution observations of radio continuum emission at 6 and 2 cm were used to separate the thermal and nonthermal radio components. It was found that thermal and nonthermal emission are well mixed even on sizescales of 10 pc. To understand the reason for the increased level of star formation activity in spiral nuclei, HI and CO emission in these galaxies is studied. The CO transition was detected in M51, M82, NGC 253, NGC 6946 and IC 342 with Ta approx. 0.5 to 2.0 K, at 20" angular resolution. The dynamics and spatial distribution of nuclear gas are being studied using VLA HI maps with 30" synthesized beams. Evidence for noncircular motions in HI was found in the nucleus of IC 342.

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