An Ultra-deep Multi-band VLA Survey of the Faint Radio Sky (COSMOS-XS): Source Catalog and Number Counts
D. Van der Vlugt, H.S.B. Algera, J.A. Hodge, M. Novak, J.F. Radcliffe,, D.A. Riechers, H. R\"ottgering, V. Smol\v{c}i\'c, F. Walter

TL;DR
This paper presents ultra-deep, high-resolution radio observations at 3 and 10 GHz in the COSMOS field, producing source catalogs and number counts that extend to fainter flux densities than previous surveys, informing models of faint radio source populations.
Contribution
The study provides the first ultra-deep, multi-band VLA survey with detailed source catalogs and number counts, revealing a steeper luminosity function evolution for faint star-forming galaxies compared to prior models.
Findings
Radio counts extend to fainter flux densities than previous surveys.
Observed counts exceed semi-empirical simulations, indicating a steeper luminosity function evolution.
Results support the T-RECS simulation predictions for faint radio sources.
Abstract
We present ultra-deep, matched-resolution Karl G. Jansky Very Large Array (VLA) observations at 10 and GHz in the COSMOS field: the COSMOS-XS survey. The final 10 and GHz images cover and and reach median rms values of and , respectively. Both images have an angular resolution of . To fully account for the spectral shape and resolution variations across the broad bands, we image all data with a multi-scale, multi-frequency synthesis algorithm. We present source catalogs for the 10 and GHz image with 91 and 1498 sources, respectively, above a peak brightness threshold of . We present source counts with completeness corrections included that are computed via Monte Carlo simulations. Our corrected radio counts at GHz with direct detections down to…
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