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| Paper: |
The Star Formation History of the Universe |
| Monograph: |
7, Science with a Next Generation Very Large Array |
| Page: |
551 |
| Authors: |
Barger, A. J.; Kohno, K.; Murphy, E. J.; Sargent, M. T.; Condon, J. J. |
| Abstract: |
Deep continuum surveys at radio wavelengths are able to cover large areas, yield high angular resolution, and do not suffer from dust extinction, thus providing a robust way to measure the star formation history of the universe. However, with the current sensitivities of extant radio telescopes, it remains challenging to detect galaxies that dominate the cosmic star formation history even with extremely long integrations. With the ngVLA, a new portion of parameter space will be opened up for radio continuum surveys: deep (5σ ≈ 1 μJy bm–1; SFR ≈ 30M☉ yr–1 at z ≈ 2), large-area (∼1 deg2), sub-arcsecond surveys at high frequencies (∼8 GHz), where the observed radio emission from high-z galaxies should be dominated by free-free emission, providing a robust measurement for the star formation history of the universe. By being able to image the star formation activity, unbiased by dust, for a large, homogeneous sample of galaxies with a wide range of luminosities into the epoch of reionization, such surveys with the ngVLA will be highly complementary to those conducted by JWST, which will only be sensitive to un-obscured star formation. |
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