Quasars That Have Transitioned from Radio-quiet to Radio-loud on Decadal Timescales Revealed by VLASS and FIRST

We have performed a search over 3440 deg\(^2\) of Epoch 1 (2017-2019) of the Very Large Array Sky Survey to identify unobscured quasars in the optical (\(0.2 < z < 3.2\)) and obscured active galactic nuclei (AGN) in the infrared that have brightened dramatically in the radio over the past one...

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Bibliographic Details
Published in:arXiv.org 2020-11
Main Authors: Nyland, Kristina, Dong, Dillon Z, Patil, Pallavi, Lacy, Mark, Sjoert van Velzen, Kimball, Amy E, Sarbadhicary, Sumit, Hallinan, Gregg, Baldassare, Vivienne, Clarke, Tracy, Goulding, Andy D, Greene, Jenny E, Hughes, Andrew, Kassim, Namir, Kunert-Bajraszewska, Magdalena, Maccarone, Thomas J, Mooley, Kunal, Mukherjee, Dipanjan, Peters, Wendy, Petrov, Leonid, Polisensky, Emil, Rujopakarn, Wiphu, Whittle, Mark, Vaccari, Mattia
Format: Article
Language:English
Subjects:
Active galactic nuclei
Fluxes
Galactic evolution
Interstellar matter
Jets
Loudness
Quasars
Radio
Red shift
Sky surveys (astronomy)
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Summary:We have performed a search over 3440 deg\(^2\) of Epoch 1 (2017-2019) of the Very Large Array Sky Survey to identify unobscured quasars in the optical (\(0.2 < z < 3.2\)) and obscured active galactic nuclei (AGN) in the infrared that have brightened dramatically in the radio over the past one to two decades. These sources would have been previously classified as "radio-quiet" quasars based on upper limits from the Faint Images of the Radio Sky at Twenty Centimeters survey (1993-2011), but they are now consistent with "radio-loud" quasars (\(L_{\rm 3\,GHz} = 10^{40 - 42} \,\, {\rm erg} \,{\rm s}^{-1}\)). A quasi-simultaneous, multiband (\(\sim1-18\) GHz) follow-up study of 14 sources with the VLA has revealed compact sources (\(
ISSN:2331-8422