| An Analytic Model of Galactic Winds and Mass Outflows |
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| 引用本文： | Cheng-Gang Shu,Hou-Jun Mo and Shu-De Mao Joint Center for Astrophysics,Shanghai Normal University,Shanghai 200234, cgshu@center. shao. ac. cn Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030 Max-Planck-Institut fur Astrophysik,Karl-Schwarzschild-Strasse 1,Postfach 1317 D-85741 Garching,Germany Astronomy Department,University of Massachusetts,Amherst,MA 01003,USA Jodrell Bank Observatory,Univ. of Manchester,Macclesfield,Cheshire SK11 9DL,UK. An Analytic Model of Galactic Winds and Mass Outflows[J]. 中国天文和天体物理学报, 2005, 5(4): 327-346 |
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| 作者姓名： | Cheng-Gang Shu Hou-Jun Mo and Shu-De Mao Joint Center for Astrophysics Shanghai Normal University Shanghai 200234 cgshu@center. shao. ac. cn Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 Max-Planck-Institut fur Astrophysik Karl-Schwarzschild-Strasse 1 Postfach 1317 D-85741 Garching Germany Astronomy Department University of Massachusetts Amherst MA 01003 USA Jodrell Bank Observatory Univ. of Manchester Macclesfield Cheshire SK11 9DL UK |
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| 作者单位： | Cheng-Gang Shu，Hou-Jun Mo and Shu-De Mao Joint Center for Astrophysics，Shanghai Normal University，Shanghai 200234; cgshu@center. shao. ac. cn Shanghai Astronomical Observatory，Chinese Academy of Sciences，Shanghai 200030 Max-Planck-Institut fur Astrophysik，Karl-Schwarzschild-Strasse 1，Postfach 1317 D-85741 Garching，Germany Astronomy Department，University of Massachusetts，Amherst，MA 01003，USA Jodrell Bank Observatory，Univ. of Manchester，Macclesfield，Cheshire SK11 9DL，UK |
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| 基金项目： | Supported by the National Natural Science Foundation of China. |
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| 摘 要： | Galactic winds and mass outflows are observed both in nearby starburst galaxies and in high-redshift star-forming galaxies. We develop a simple analytic model to understand the observed superwind phenomenon with a discussion of the model uncertainties. Our model is built upon the model of McKee & Ostriker for the interstellar medium. It allows one to predict how properties of a superwind, such as wind velocity and mass outflow rate, are related to properties of its starforming host galaxy, such as size, gas density and star formation rate. The model predicts a threshold of star formation rate density for the generation of observable galactic winds. Galaxies with more concentrated star formation activities produce superwinds with higher velocities. The predicted mass outflow rates are comparable to (or slightly larger than) the corresponding star formation rates. We apply our model to both local starburst galaxies and high-redshift Lyman break galaxies, and find its predictions to be in good agreement with current observations. Our model is simple and so can be easily incorporated into numerical simulations and semi-analytical models of galaxy formation.
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| 关 键 词： | 银河系 风 流动性 数值模拟 |
An Analytic Model of Galactic Winds and Mass Outflows |
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| Cheng-Gang Shu Hou-Jun Mo Shu-De Mao. An Analytic Model of Galactic Winds and Mass Outflows[J]. Chinese Journal of Astronomy and Astrophysics, 2005, 5(4): 327-346 |
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| Authors: | Cheng-Gang Shu Hou-Jun Mo Shu-De Mao |
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| Affiliation: | [1]Joint Center for Astrophysics, Shanghai Normal University, Shanghai 200234 [2]Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030 [3]Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Strasse 1, Postfach 1317 D-85741 Garching, Germany [4]Astronomy Department, University of Massachusetts, Amherst, MA 01003, USA [5]Jodrell Bank Observatory, Univ. of Manchester, Macclesfield, Cheshire SK11 9DL, UK |
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| Abstract: | Galactic winds and mass outflows are observed both in nearby starburst galaxies and in high-redshift star-forming galaxies. We develop a simple analytic model to understand the observed superwind phenomenon with a discussion of the model uncertainties. Our model is built upon the model of McKee & Ostriker for the interstellar medium. It allows one to predict how properties of a superwind, such as wind velocity and mass outflow rate, are related to properties of its starforming host galaxy, such as size, gas density and star formation rate. The model predicts a threshold of star formation rate density for the generation of observable galactic winds. Galaxies with more concentrated star formation activities produce superwinds with higher velocities. The predicted mass outflow rates are comparable to (or slightly larger than) the corresponding star formation rates. We apply our model to both local starburst galaxies and high-redshift Lyman break galaxies, and find its predictions to be in good agreement with current observations. Our model is simple and so can be easily incorporated into numerical simulations and semi-analytical models of galaxy formation. |
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| Keywords: | galaxies: starburst - galaxies: ISM - galaxies: kinematics and dynamics - galaxies: formation and evolution |
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