We present the VLA-COSMOS 3 GHz Large Project based on 384 hours of observations with the Karl G. Jansky Very Large Array ( VLA ) at 3 GHz ( 10 cm ) toward the two square degree Cosmic Evolution Survey ( COSMOS ) field .
The final mosaic reaches a median rms of 2.3 \mu Jy beam ^ { -1 } over the two square degrees at an angular resolution of 0.75 \arcsec .
To fully account for the spectral shape and resolution variations across the broad ( 2 GHz ) band , we image all data with a multiscale , multifrequency synthesis algorithm .
We present a catalog of 10,830 radio sources down to 5 \sigma , out of which 67 are combined from multiple components .
Comparing the positions of our 3 GHz sources with those from the Very Long Baseline Array ( VLBA ) -COSMOS survey , we estimate that the astrometry is accurate to 0.01 \arcsec at the bright end ( signal-to-noise ratio , S/N _ { \mathrm { 3 GHz } } > 20 ) .
Survival analysis on our data combined with the VLA-COSMOS 1.4 GHz Joint Project catalog yields an expected median radio spectral index of \alpha = -0.7 .
We compute completeness corrections via Monte Carlo simulations to derive the corrected 3 GHz source counts .
Our counts are in agreement with previously derived 3 GHz counts based on single-pointing ( 0.087 square degrees ) VLA data .
In summary , the VLA-COSMOS 3 GHz Large Project simultaneously provides the largest and deepest radio continuum survey at high ( 0.75 \arcsec ) angular resolution to date , bridging the gap between last-generation and next-generation surveys .