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【DoA Colloquium】March 4th by Renbin Yan
Description
Title：Deficiencies of current photoionization models and the need for a high spatial resolution survey
Speaker：Renbin Yan
Abstract: Understanding feedback of star formation and chemical evolution of galaxies requires accurate interpretation of observational data. However, spatially-resolved observations on kpc scales from SDSS-IV/MaNGA and on 100 pc scales from PHANGS-MUSE have revealed many inconsistencies with current photoionization models of star-forming regions. Efforts resolving these puzzles are further complicated by small-scale spatial correlations between dust and ionized gas. These problems would directly lead to systematics in scaling relations such as mass-metallicity relations and its secondary dependences. I will discuss the results of our analyses in these directions, which could only be understood by new spectroscopy observations resolving sub-parsec or few parsec scales. To this end, we are developing the AMASE-P survey. As a pilot program of a future larger scale survey, AMASE-P will be a wide-area integral field spectroscopy survey studying the ionized gas and dust in the Milky Way and nearby galaxies with a spatial resolution of subparsec to 10s of parsecs, and a spectral resolution close to R~15,000. It will include both a northern survey and a southern survey, cover hundreds of square degrees of sky in the Milky Way, LMC, SMC, M31, M33, and other local group galaxies. It is expected to start observing within a year. I will describe the progress of the project and its science prospects.
Bio:
Prof. Renbin Yan got his bachelor degree from Peking University and his PhD from University of California at Berkeley. After that, he was a postdoctoral scholar at the University of Toronto and New York University. In 2012, he joined the faculty at the University of Kentucky and was tenured in 2018. In 2021, he joined the Chinese University of Hong Kong and was awarded the title of Global STEM Scholar. Prof. Yan's research interest includes the astrophysics of the interstellar medium, stellar population, and astronomical instrumentation. He is experienced at conducting large spectroscopy surveys. He is the Survey Scientist of the SDSS-IV/MaNGA project, which is the largest integral field spectroscopy survey of galaxies to date, providing data for 10,010 unique galaxies. He also leads the MaNGA Stellar Library project, which is the largest and most-comprehensive stellar library to date. Recently, he is starting a new astronomical instrumentation project to build instruments for the next generation spectroscopy surveys. In 2024, he is awarded funding from the NSFC Distinguished Young Scholar program.
Time: 14:00-15:00, 4/Mar, Friday
Venue: Room 506 (Large seminar room), Department of Astronomy
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