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DTSTART;TZID=America/Los_Angeles:20211217T120000
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SUMMARY:VIRTUAL INPA SEMINAR | Jason Sun (CalTech )
DESCRIPTION:Speaker: Jason Sun (CalTech) \nTitle: Understanding the Cosmological Evolution of Galaxies with Intensity Mapping  \nAbstract: \nThe intensity mapping (IM) technique has been devised as a powerful tool to investigate the formation/evolution of the large scale structure and galaxies\, alternative and complementary to the more traditional means relying on galaxy detection. In the high-redshift universe\, in particular\, synergies of multiple IM tracers have been widely perceived as a promising way of revealing the connection between the emergence of first stars and galaxies and the reionization\, a still mysterious chapter of cosmic history that even the JWST might not fully elucidate. I will present two main themes of my research on applications of the IM technique to understand the cosmological evolution of galaxies. On the experimental side\, I will introduce the analysis and forecasting work I led for the Tomographic Ionized-carbon Mapping Experiment (TIME). TIME is a novel imaging spectrometer array recently commissioned that pioneers the quest for measuring large-scale intensity fluctuations of the 158-micron [CII] line emission redshifted from the epoch of reionization\, which serves an ideal probe of ongoing cosmic star formation that sources the hydrogen-ionizing radiation background. I will discuss how TIME\, with an optimization of survey strategy\, can inform us about the reionization on its own and through synergies with other probes like galaxy surveys. I will also discuss challenges and opportunities arising from low-redshift “line interlopers”\, namely rotational CO lines at z ≈ 0.5 to 2 for TIME\, which require some exquisite cleaning strategy to be removed but at the same time allow a census of the molecular gas content of galaxies near the “cosmic high noon”. On the theory side\, I will introduce LIMFAST\, a fast\, semi-numerical simulation developed to physically and self-consistently simulate a large set of high-redshift line-intensity mapping (LIM) data in different frequency regimes\, including tracers of neutral gas (e.g.\, HI 21cm) and star-forming galaxies (e.g.\, Lyα\, [CII]). I will elaborate on the scientific applications of LIMFAST to simulate multi-tracer LIM observations of high-redshift galaxies and their interplay with the intergalactic medium during reionization. Particular emphases will be on (1) how various LIM signals\, such as Hα\, Lyα and [CII]\, and their cross-correlations with the HI 21cm signal\, may be affected by the astrophysics governing galaxy formation\, such as feedback and star formation laws; and (2) how these astrophysical processes may be studied with future LIM experiments to deepen our understanding of high-redshift galaxy populations from both observational and theoretical perspectives. \n\nJoin Zoom Meeting\nhttps://lbnl.zoom.us/j/98739327626\nMeeting ID: 987 3932 7626
URL:https://inpa.lbl.gov/event/virtual-inpa-seminar-jason-sun-caltech/
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