Speaker
Description
Multi-band observation of deep fields provides a unique scope to study different aspects of galaxy evolution by effectively detecting fainter sources in the distant universe. We utilize the angular resolution (~1.2 arcsec), sensitivity, and field of view of the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat to image several HST deep fields in the FUV and NUV bands. Combining UVIT imaging with other multi-band data from HST, KPNO, Spitzer, and Herschel, we study the UV continuum slope ($\beta$) and IRX-$\beta$ relation in a sample of UV-selected galaxies between redshift 0.4 and 0.75 in the AUDF-north field to show: (1) the interstellar extinction at z~0.6 follows the global $\beta$-z relation, reinforcing the gradual reddening of galaxy UV continuum with cosmic time (2) the selected galaxies support diverse attenuation laws with a specific preference to the SMC-like attenuation. Utilizing the JWST MIRI imaging of a sample of galaxies in the AUDF-south field, we further probe the 7.7 and 11.3 $\mu$m emission strength of the Polycyclic Aromatic Hydrocarbon (PAH) dust molecules at varying stellar UV radiation field at $z\sim0.6$. Our study shows a good correlation of PAH strength with galaxy stellar mass and rest-frame UV luminosity. Overall, I will present important insights on galaxy dust evolution at a less explored redshift regime that links the cosmic noon to the present day.
| Section | Galaxy/Extragalactic |
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