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Predicting the Number of Radio Sources Seen by Both VLASS and LSST

arXiv · Astrophysics of Galaxies(2024)

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Abstract
Radio surveys typically sample extragalactic sources in higher redshift regimes than is typical for optical surveys, resulting in many radio sources not having a detected optical counterpart. Over the next decade the Legacy Survey of Space and Time (LSST) will be performing the deepest (i < 26.4mag) wide-area optical survey to date increasing the fraction of radio sources for which we have optical data. In this Research Note we use the Hyper Suprime-Cam survey to analyse how the fraction of radio sources in the Very Large Array Sky Survey (VLASS) with optical detections varies as a function of i-band magnitude and extrapolate to predict the number of optical counterparts we expect LSST to detect. Assuming a final VLASS point source depth of S_3 GHz≲350 μJy, we expect LSST to identify optical counterparts to ∼ 10^6 radio sources in VLASS.
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