Structure in the Neutral Hydrogen Disk of the Spiral Galaxy IC 342

Details Structure in the Neutral Hydrogen Disk of the Spiral Galaxy IC 342 Structure in the Neutral Hydrogen Disk of the Spiral Galaxy IC 342

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....119.1720c&link_type=abstract

The Astronomical Journal, Volume 119, Issue 4, pp. 1720-1736.

Astronomy and Astrophysics

Astronomy

37

Galaxies: Individual (Ic 342), Galaxies: Ism, Galaxies: Spiral, Galaxies: Structure, Ism: H I

Scientific paper

We present 38"resolution Very Large Array 21 cm continuum and H I line emission observations of the spiral galaxy IC 342, at an adopted distance of 2 Mpc. Kinematic evidence exists for a m=2 spiral density wave in the inner disk with a corotation radius located at 4 kpc and a possible four-arm pattern in the outer disk. On smaller scales, outside of the central depression in H I column density, H I is organized into a complex pattern of relatively short (~2-5 kpc), interconnected, spiral arm segments. Numerous ``holes'' are distributed throughout the H I disk. By considering the effects of shear, structures that are not self-gravitating, such as holes and voids, cannot be long-term phenomena. The timescale, combined with the total energy required to evacuate holes, leads us to reject wind and supernovae origins for the large-scale pattern of H I holes in IC 342. Gravitational instabilities in the disk form on a timescale that is short compared with the rotation period of the disk. The pattern of H I spiral arm segments exists on a scale that is consistent with their being material arms that result from gravitational instabilities. The H I cavities are a natural remnant of the process.

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