Effects of ram pressure on the gas distribution and star formation in the Large Magellanic Cloud - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




Effects of ram pressure on the gas distribution and star formation in the Large Magellanic Cloud - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We use high resolution N-body-SPH simulations to study the hydrodynamicalinteraction between the Large Magellanic Cloud LMC and the hot halo of theMilky Way. We investigate whether ram-pressure acting on the satellite-s ISMcan explain the peculiarities observed in the HI distribution and the locationof the recent star formation activity. Due to the present nearly edge-onorientation of the disk with respect to the orbital motion, compression at theleading edge can explain the high density region observed in HI at thesouth-east border. In the case of a face-on disk according to Mastropietro etal. 2008 the LMC was moving almost face-on before the last perigalacticpassage, ram-pressure directed perpendicularly to the disk produces a clumpystructure characterized by voids and high density filaments that resemble thoseobserved by the Parkes HI survey. As a consequence of the very recent edge-onmotion, the H-alpha emission is mainly concentrated on the eastern side where30 Doradus and most of the supergiant shells are located, although some H-alphacomplexes form a patchy distribution on the entire disk. In this scenario onlythe youngest stellar complexes show a progression in age along the leadingborder of the disk.



Author: Chiara Mastropietro LERMA, Observatoire de Paris, Andreas Burkert University Observatory of Munich, Ben Moore University of Zuric

Source: https://arxiv.org/



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