Molecular Oxygen detected in Mrk231

As the third most abundant element in the universe after hydrogen and helium, oxygen's chemistry in molecular clouds  is important for understanding properties of the molecular gas.  Molecular oxygen (O2), which was thought  to be an important coolant in molecular clouds,  has been searched for in the Milky Way sources with space missions  and  in external galaxies with ground-based  facilities in past decades. The O2 abundance turned out to be much lower than expected, with only a few Galactic detections of O2 emission, and only upper limits in extra-galactic sources.  We present  the first extra-galactic detection of  O2 emission  toward the nearest QSO Mrk 231 at the rest frequency of  118.750343 GHz with IRAM 30 meter and confirmed by the NOEMA.  O2 emission in Mrk 231 is extended and associated with outflowing molecular gas, which provides an ideal tool to study AGN-driven molecular outflows with ALMA on  kpc scale. O2 might also be an important coolant in the AGN-driven outflowing molecular gas with abundance comparable to that  of CO. 

Prof. Junzhi WANG @ Shanghai Observatory
Zoom Meeting ID: 836 243 760
Wednesday, March 18, 2020 - 2:00PM to Wednesday, March 18, 2020 - 2:30PM