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29 March 2024
 
  » arxiv » astro-ph/0109190

 Article overview


Atomic and Molecular Gas in the Starburst Galaxy NGC4945
M. Ott ; J.B. Whiteoak ; C. Henkel ; R. Wielebinski ;
Date 12 Sep 2001
Subject astro-ph
AbstractSpatial and kinematical correlations between HI and CO (2-1) emission of the southern spiral galaxy NGC4945 are studied with a common angular (23 arcsec) and velocity resolution (7 km/s). The 21cm continuum emission is also observed. The HI kinematics yield a galaxy mass of 1.4x10^{11} Mo within a radius of 380 arcsec, with molecular and neutral atomic gas each contributing 2%. Nuclear HI absorption at velocities 80 km/s higher than systemic indicates gas flowing towards the centre. HI features at each end of the major axis (R ~ 600 arcsec) are interpreted as spiral arms that are viewed tangentially and that also cause prominent emission features in the radio continuum, HI, and CO further inside the galaxy. A central elongated region showing non-circular motions is interpreted as a bar which fuels the nuclear starburst. HI and CO position-velocity data have been analysed using linear resonance theory and possible locations of resonances are identified.
Source arXiv, astro-ph/0109190
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