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Rings, lenses, nuclear bars: the fundamental role of gas

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Barred Galaxies and Circumnuclear Activity

Part of the book series: Lecture Notes in Physics ((LNP,volume 474))

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Abstract

Spiral galaxies evolve through angular momentum transfer from the center to outer parts; stars are participating to this evolution but quickly heat up through gravitational instability to reach a hot quasi steady-state in the absence of gas. The latter is then the motor of evolution, and is at the origin of the formation of secondary structures, as rings, lenses or bars within bars. The evolution can be self-regulated, since too much gas concentration weakens the bar, and star-formation locks the gas in the disk, slowing the gas inflow to the nucleus. We show how fast-rotating nuclear features can halt the evolution during a short time.

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Aage Sandqvist Per Olof Lindblad

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© 1996 Springer-Verlag

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Combes, F. (1996). Rings, lenses, nuclear bars: the fundamental role of gas. In: Sandqvist, A., Lindblad, P.O. (eds) Barred Galaxies and Circumnuclear Activity. Lecture Notes in Physics, vol 474. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0101970

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  • DOI: https://doi.org/10.1007/BFb0101970

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-61571-2

  • Online ISBN: 978-3-540-70694-6

  • eBook Packages: Springer Book Archive

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