Dust Spirals and Acoustic Noise in the Nucleus of the Galaxy NGC 2207
Journal article, 1998

Observations with the Hubble Space Telescope reveal an irregular network of dust spiral arms in the nuclear region of the interacting disk galaxy NGC 2207. The spirals extend from ~50 to ~300 pc in galactocentric radius, with a projected width of ~20 pc. Radiative transfer calculations determine the gas properties of the spirals and the inner disk and imply a factor of ~4 local gas compression in the spirals. The gas is not strongly self-gravitating, nor is there a nuclear bar, so the spirals could not have formed by the usual mechanisms applied to main galaxy disks. Instead, they may result from acoustic instabilities that amplify at small galactic radii. Such instabilities may promote gas accretion into the nucleus.

galaxies: individual (NGC 2207)

instabilities

hydrodynamics

ISM: structure

galaxies: nuclei

Author

B.G. Elmegreen

D.M. Elmegreen

E. Brinks

Chengyin Yuan

M. Kaufman

M. Klaric

L. Montenegro

C. Struck

Magnus Thomasson

Chalmers, Onsala Space Observatory

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 503 2 L119-L122

Subject Categories

Astronomy, Astrophysics and Cosmology

Infrastructure

Onsala Space Observatory

More information

Created

10/8/2017