BASS XLVII: 22 GHz Radio Atlas of Swift-BAT Selected AGN

Abstract

We present the third phase of the largest high-frequency, high-resolution imaging survey of 231 nearby, hard X-ray selected AGN, with a very high $98\pm 1\%$ detection fraction. This survey presents VLA 22 GHz radio observations with 1" spatial resolution covering over $6$ orders of magnitude in radio luminosity in nearby AGN that span $\sim 4$ orders of magnitude in black hole mass and X-ray luminosity. We identify three different radio morphologies: $44\pm 3\%$ (102/231) are compact or unresolved, $46\pm 3\%$ (106/231) show an extended structure (star formation, possible one-sided jets, etc.), and $8\pm 2\%$ (19/231) have a biconical or two-sided jet-like morphology. The remaining $2\pm 1\%$ (4/231) sources are non-detections. The radio-to-X-ray luminosity ratios of the Swift-BAT AGN (${\text{L}}_R/{\text{L}}_{14-195\text{keV}}\sim 10^{-5.5}$ and ${\text{L}}_R/{\text{L}}_{2-10\text{keV}}\sim 10^{-5}$) with a scatter of $\sim 0.5$ dex are similar to that of coronally active stars (${\text{L}}_R/{\text{L}}_X\sim 10^{-5}$). For most targets, extended emission in radio-quiet objects is broadly consistent with the expectation for star formation from previous FIR observations, once the contribution from the radio core has been subtracted. Our sample represents nearby analogs of distant AGN at the peak of black hole growth, and thus the high detection fraction in our work has important implications for future high frequency AGN radio surveys with the next generation VLA (ngVLA) or Square Kilometre Array (SKA), both of which should detect large fractions of more distant AGN.

arXiv comment26 pages, 8 figures, 4tables. Accepted for publication in ApJ

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