Philip Appleton
Boyden Obs., Univ. Free State (Boyden, Afrique du Sud)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « Searching for shocks and turbulence in dense galaxy environments » |
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Philip Appleton |
| Multi-wavelength (from X-rays to radio) continuum and Spitzer/Herschel spectroscopy and Optical IFU observations of the Stephan’s Quintet IGM filament and the “Taffy" Bridge provide convincing evidence for galaxy-collision-induced shocks (and likely a turbulent energy cascade) to explain the dominant diffuse emission from warm molecular hydrogen and far-IR fine structure lines. From there I will briefly touch on an extension to a larger sample of H2-excited Compact Groups. Those results, while still ongoing, may suggest infall along tidal filaments, (and more rarely AGN outflows) as the main heating source for the warm Compact Group H2, which may suppress star formation (perhaps only temporarily) in the late stages of group evolution. Finally, if time permits, I will discuss the very challenging future prospects of detecting turbulent warm H2 from high-z protogalaxies at z = 9-10 using strong lensing caustics and shock amplification to help reveal the expected faint signals from the rare massive dark halos. |
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vendredi 9 décembre 2016 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |