Ram pressure stripping made easy: an analytical approach
| Autor: | P. Jáchym, R. Taylor, Jan Palouš, Joachim Köppen |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Stripping (chemistry) 010308 nuclear & particles physics FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Kinematics Parameter space Galactic plane Astrophysics - Astrophysics of Galaxies 01 natural sciences Galaxy Pulse (physics) Ram pressure Computational physics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Orbit (dynamics) 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 479:4367-4390 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/sty1610 |
| Popis: | The removal of gas by ram pressure stripping of galaxies is treated by a purely kinematic description. The solution has two asymptotic limits: if the duration of the ram pressure pulse exceeds the period of vertical oscillations perpendicular to the galactic plane, the commonly used quasi-static criterion of Gunn & Gott is obtained which uses the maximum ram pressure that the galaxy has experienced along its orbit. For shorter pulses the outcome depends on the time-integrated ram pressure. This parameter pair fully describes the gas mass fraction that is stripped from a given galaxy. This approach closely reproduces results from SPH simulations. We show that typical galaxies follow a very tight relation in this parameter space corresponding to a pressure pulse length of about 300 Myr. Thus, the Gunn & Gott criterion provides a good description for galaxies in larger clusters. Applying the analytic description to a sample of 232 Virgo galaxies from the GoldMine database, we show that the ICM provides indeed the ram pressures needed to explain the deficiencies. We also can distinguish current and past strippers, including objects whose stripping state was unknown. Accepted for publication in MNRAS. Several interactive JavaScript tools which evaluate the analytical considerations of this paper are available at http://www.astrophysik.uni-kiel.de/~koeppen/JS/RPShome.html |
| Databáze: | OpenAIRE |
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