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Title:
Dust Spirals and Acoustic Noise in the Nucleus of the Galaxy NGC 2207
Authors:
Elmegreen, B. G.; Elmegreen, D. M.; Brinks, E.; Yuan, C.; Kaufman, M.; Klarić, M.; Montenegro, L.; Struck, C.; Thomasson, M.
Affiliation:
AA(IBM Research Division, T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, NY 10598; .), AB(Department of Astronomy, Vassar College, Poughkeepsie, NY 12604.), AC(Departmento de Astronomía, Universidad de Guanajuato, Apartado Postal 144, Guanajuato, Gto. 36000, México.), AD(Institute of Astronomy and Astrophysics, Academia Sinica, Nankang, Taipei, Taiwan, ROC.; City College of New York, 138th Street on Convent Avenue, New York, NY 10031.), AE(Department of Physics and Department of Astronomy, Ohio State University, 174 West 18th Avenue, Columbus, OH 43210.), AF(Midlands Technical College, Columbia, SC 29202.), AG(City College of New York, 138th Street on Convent Avenue, New York, NY 10031.), AH(Department of Physics and Astronomy, Iowa State University, Ames, IA 50010.), AI(Onsala Space Observatory, S-439 92 Onsala, Sweden.)
Publication:
The Astrophysical Journal, Volume 503, Issue 2, pp. L119-L122. (ApJL Homepage)
Publication Date:
08/1998
Origin:
APJ; UCP
Astronomy Keywords:
HYDRODYNAMICS, INSTABILITIES, ISM: STRUCTURE, GALAXIES: INDIVIDUAL NGC NUMBER: NGC 2207, GALAXIES: NUCLEI, Hydrodynamics, Instabilities, ISM: Structure, Galaxies: Individual: NGC Number: NGC 2207, Galaxies: Nuclei
Abstract Copyright:
(c) 1998: The American Astronomical Society
DOI:
10.1086/311551
Bibliographic Code:
1998ApJ...503L.119E

Abstract

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.

Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS5-26555.

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