Radio recombination lines: Theory and observations 射电复合线：理论与观测

I will introduce  our recent work on excitation and radiation model of atomic hydrogen in ionized gas, as well on-going  radio recombination line (RRL) observations with FAST.  The key result is that most RRLs are weak maser instead of thermal emission.  We also discuss the systematic bias of using line (RRL) to continuum ratio (free-free) to obtain electron density of ionized gas under LTE assumption.  A preliminary result of L band RRL observation with the FAST will also be present.


Speaker: 
Junzhi Wang (Guangxi University)
Place: 
Join Zoom Meeting https://zoom.us/j/83102096662?pwd=SStwUlU5NHFKSHF6L0t0allwa1Bldz09 Meeting ID: 831 0209 6662 Passcode: 368889
Host: 
Ke Wang
Time: 
Thursday, September 29, 2022 - 3:30PM to Thursday, September 29, 2022 - 4:30PM
Biography: 
Junzhi Wang is an Professor in Guangxi University. He obtained his B.S., M.S., and PhD degree from Peking University in 1998, 2001, and 2005. He spent 2 years from Nov. 2002 to Dec. 2004 as a SAO pre-doc at Harvard-Smithonian center for astrophysics. He had been an postdoc at Purple Mountain Observatory, CAS, an associate Professor of astronomy at Nanjing University, and a research Professor at Shanghai Astronomical Observatory, CAS. His research interests include, star formation and gas properties in galaxies and the Milky Way, AGN feedback, Mega-masers, Astro-chemistry, ISM, etc.