Properties of ionized outflows in MaNGA DR2 galaxies

Feedback originated from star formation and AGN activity in galaxies can have a significant impact on their evolution. The action of feedback leads to several processes that might have a significant effect on the surrounding gas, for example by heating the system, halting or enhancing star formation, or enriching the interstellar medium. Constraining the incidence and properties of feedback events such as ionized outflows is therefore crucial to understand galaxy evolution. In this talk I will present the results from a thorough search and characterization of ionized outflows in a large number of nearby galaxies (z<0.1) hosting star formation and AGN activity. The sample of galaxies is taken from the Second Data Release of the MaNGA Integral Field Spectroscopic survey, which contains more than 2700 individual objects. Benefitting from the wide spatial coverage of the MaNGA data we isolate the regions hosting star formation and AGN activity and perform a detailed modelling of their spectra around the Halpha line, aiming to identify gas at high velocities associated with ionized outflows. As a result of our analysis we find evidence for ionized outflows in more than 100 regions hosting star formation or AGN activity. Interestingly, several of them show maximum velocities in the ionized gas of the same order of those found in local ULIRG/s, but with star formation rates (SFRs) a factor of ~100 lower. We also show that ionized outflows are observed in regions with SFRs down to 0.15 Msun/yr and that the kinematics of the ionized gas do not strongly depend on the associated SFRs. Our results provide interesting clues about the role played by ionized outflows in relatively small regions (< 1 kpc) serving as a baseline to understand outflows at larger scales.

25/06/2019 - 12:30
Bruno Rodríguez Del Pino