Sub-minute Variability: Search for Hidden Turbulent Gas through Interstellar Scintillation with LSST - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Conference Papers Year : 2013

Sub-minute Variability: Search for Hidden Turbulent Gas through Interstellar Scintillation with LSST

M. Moniez

Abstract

We propose a new way to search for (hidden)cool molecular hydrogen H2 in the Galaxy through diffractive and refractive effects: Stars twinkle because their light crosses the atmosphere. The same phenomenon is expected on a longer time scale when the lightof a remote star crosses an interstellar turbulent molecular cloud, but it has never been observed at optical wavelengths. Our simulations and test observations show that in favourable cases, the light of a background star can be subject to stochastic fluctuations on the order of a few percent at a characteristic time scale of a few minutes. I will discuss the unique potential of the LSST movie-mode to search and study such interstellar scintillation due to turbulent clouds through highly sampled light-curves. Since scintillation is expected to be a rare process (optical depth < 10 -3) and needs highly sampled light curves of small apparent size stars (i.e. faint stars), the--wide, deep and fast--LSST is the ideal device for this science. I will show that a modest amount of a few nights of observation time with LSST can significantly constrain the last unknown baryonic contribution to the Galactic mass.
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Dates and versions

in2p3-00859959 , version 1 (09-09-2013)

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  • HAL Id : in2p3-00859959 , version 1

Cite

M. Moniez. Sub-minute Variability: Search for Hidden Turbulent Gas through Interstellar Scintillation with LSST. LSST@Europe: The path to science, Sep 2013, Cambridge, United Kingdom. ⟨in2p3-00859959⟩
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