“School of Astronomy”
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| Paper IPM / Astronomy / 18196 | ||||||||||||||||
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Investigating the thermal and non-thermal processes in galaxies is vital to understand their evolution over cosmic time. In the nearby universe, observations with SKA pathfinders show that the non-thermal processes, in which magnetic fields and cosmic rays are involved, can decelerate the formation of massive stars. They can also help the onset of winds and outflows in galaxies. In the distant universe, SKA will make a major breakthrough in mapping the non-thermal processes shedding light on the subject. Our simulations show that, already in its first phase of construction, the proposed SKA surveys will be able to trace the evolution history of the ISM in M51- and NGC6946-analogs beyond the cosmic noon. This simulation indicates that cosmic-ray-driven winds can be even more important at high redshifts. We further investigate this through unresolved MeerKAT, VLA, GMRT observations of star forming galaxies in the COSMOS field. Our radio SED analysis shows that 1) most of the rest-frame mid-radio emission from these galaxies is due to synchrotron, 2) the synchrotron spectral index flattens with z, and 3) the energy budget of galaxies emitting in mid-radio increases with z. These results support a possible impact of cosmic rays and magnetic fields on the ISM/IGM structures and the evolution of galaxies.
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