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Outskirts of Nearby Disk Galaxies: Star Formation and Stellar Populations

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Outskirts of Galaxies

Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 434))

Abstract

The properties and star formation processes in the far-outer disks of nearby spiral and dwarf irregular galaxies are reviewed. The origin and structure of the generally exponential profiles in stellar disks is considered to result from cosmological infall combined with a non-linear star formation law and a history of stellar migration and scattering from spirals, bars and random collisions with interstellar clouds. In both spirals and dwarfs, the far-outer disks tend to be older, redder and thicker than the inner disks, with the overall radial profiles suggesting inside-out star formation plus stellar scattering in spirals and outside-in star formation with a possible contribution from scattering in dwarfs. Dwarf irregulars and the far-outer parts of spirals both tend to be gas dominated, and the gas radial profile is often non-exponential although still decreasing with radius. The ratio of Hα to far-UV flux tends to decrease with lower surface brightness in these regions, suggesting either a change in the initial stellar mass function or the sampling of that function or a possible loss of Hα photons.

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Acknowledgements

DAH appreciates the support of the Lowell Observatory Research Fund in writing this chapter.

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Authors and Affiliations

  1. IBM Research Division, T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, NY, 10598, USA

    Bruce G. Elmegreen

  2. Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ, 86001, USA

    Deidre A. Hunter

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Correspondence to Bruce G. Elmegreen .

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  1. Inst de Astrofísica de Canarias, San Cristobal de la Laguna, Spain

    Johan H. Knapen

  2. Space Telescope Science Institute, Baltimore, USA

    Janice C. Lee

  3. Dept. Astrofisica, Universidad Complutense de Madrid, Madrid, Spain

    Armando Gil de Paz

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Elmegreen, B.G., Hunter, D.A. (2017). Outskirts of Nearby Disk Galaxies: Star Formation and Stellar Populations. In: Knapen, J., Lee, J., Gil de Paz, A. (eds) Outskirts of Galaxies. Astrophysics and Space Science Library, vol 434. Springer, Cham. https://doi.org/10.1007/978-3-319-56570-5_4

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