Color gradients and dust attenuation in CANDELS galaxies

Studies of star-formation in galaxies on the star-forming main sequence at z~1-2 generally rely on integrated quantities, and they are known to be substantially obscured by dust at UV-optical wavelengths. In this talk, I present work on spatially resolved UV-optical color gradients. Our work indicates that the centers of star-forming galaxies at z=1~2 are still actively forming stars as their outer parts, but highly obscured by dust (A_uv > 4.0 mag). This means that understanding of spatial-resolved galaxy evolution patterns is ambiguous without comprehensive understanding of dust. I will discuss how the addition of deep mid-infrared observations, sampling PAH (polycyclic aromatic hydrocarbon) emission at z=1~2, can better constrain the dust properties of galaxies. The results of this study will be important for interpreting future JWST/MIRI observations.

Weichen Wang (王炜辰)
1st meeting room, KIAA
Fri, 2017-06-23 12:00 to 13:00