Colloquium: The Puzzle of Low Ionization Gas Emission in Galaxies

09/22/2017 - 3:30pm to 4:30pm
Speaker(s) / Presenter(s): 
Professor Renbin Yan
Type of Event (for grouping events):
We are running a large observational program called MaNGA --- Mapping Nearby Galaxies at Apache Point Observatory. It is the largest integral field spectroscopy survey of nearby galaxies, carried out as part of the 4th generation Sloan Digital Sky Survey. We are using this data to study the internal structure and formation history of thousands of nearby galaxies. In this talk, I will focus on our effort in understanding the low ionization warm ionized gas. Warm ionized gas can be detected with optical emission lines and have been studied for decades. However, there are two classes of widespread optical line-emitting regions for which the ionization mechanisms are still evading us 30 years after their discoveries: low ionization emission (LINER-like) in quiescent galaxies and the diffuse ionized gas (DIG) in star-forming galaxies. They may hold critical clues to the heating mechanisms of the ISM, and the evolution of ISM as star formation shuts down. I will discuss the progress we are making on these issues, and highlight some results on this topic based on data from MaNGA.
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