Program: GS-2022A-FT-204

Title:Star formation or quenching in XUV disk of galaxies?
PI:Jin Koda
Co-I(s): Annie Zavagno, Morten Andersen, Benoit Neichel, Samuel Boissier, Francoise Combes, Masafumi Yagi

Abstract

The roles of positve and negative feedback on Star Formation Efficiency are still debated. The extended UV (XUV) disk of galaxies show a low Star Formation Rate compared to the one measured in the central part of the disks. One possible explanation is the different importance of feedback processes from massive stars that could impact the star formation (SF) in different ways (positive, favoring the SF or negative, quenching the SF) depending on the location in the disk. Recent unpublished ALMA data revelead the presence of compact (20 pc) clumps seen in the dense gas tracer CO (J=3-2) within the XUV disk of Messier 83. The spatial distribution of these clumps is closely linked to that of the ionized regions observed with Subaru. We propose to obtain FLAMINGOS-2 J and Ks band imaging of the region observed with ALMA and map the star formation history to quantify the feedback processes. By combining the different wavelengths (GALEX FUV, tracing the old star formation, Halpha, tracing the recent star formation and CO+near infrared (tracing the young star formation) we will search for possible massive clusters associated with the CO clumps (that would suggest a positive feedback) or the absence of near-infrared counterpart that would suggest a negative feedback (gas just pushed away). The star formation history will be mapped over the whole 6 arcmin FLAMINGOS-2 field.