S317p.52 — The role of the Milky Way hot coronal gas on its dwarf galaxies stellar population

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Aug 4th at 6:00 PM until 6:00 PM

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Author(s): Stefano Pasetto2, Mark Cropper2, Yutaka fujita1, Cesare Chiosi4, Eva K. Grebel3

Institution(s): 1. Osaka University, 2. University College London, 3. University of Heidelberg, 4. University of Padua

A large amount (∼5 ×1010 Msun) of hot gas is thought to exist in an extended (∼200 kpc) hot diffuse halo around the Milky Way (MW). We investigate the competitive role of the different dissipative phenomena acting on the onset of star formation history of gravitationally bound system in this external environment. Ram pressure, Kelvin-Helmholtz instability, Rayleigh-Taylor, and tidal forces are accounted separately in an analytical framework and compared in their role in influencing the star forming regions. We present an analytical criterion to elucidate the dependence of star formation in a spherical stellar system on its surrounding environment useful in observational applications as well as theoretical interpretations of numerical results.
We consider the different signatures of these phenomena in synthetically realized colour-magnitude diagrams (CMDs) of the orbiting system thus investigating the detectability limits of these different effects for future observational projects and their relevance.
The theoretical framework developed has direct applications to the cases of our MW system as well as dwarf galaxies in galaxy clusters or any primordial gas-rich cluster of stars orbiting within its host galaxy.