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Variable radio AGN at high redshift identified in the VLA Sky Survey

Published online by Cambridge University Press:  29 March 2021

Kristina Nyland Open the ORCID record for Kristina Nyland [Opens in a new window] ,
Dillon Dong ,
Pallavi Patil ,
Mark Lacy ,
Amy Kimball ,
Gregg Hallinan ,
Sumit Sarbadhicary ,
Emil Polisensky ,
Namir Kassim  and
Wendy Peters
...Show all authors
Kristina Nyland
Affiliation:
National Research Council fellow, resident at NRL, Washington, DC, USA
Dillon Dong
Affiliation:
California Institute of Technology, Pasadena, CA, USA
Pallavi Patil
Affiliation:
University of Virginia, Charlottesville, VA, USA NRAO, Charlottesville, VA, USA
Mark Lacy
Affiliation:
NRAO, Charlottesville, VA, USA
Amy Kimball
Affiliation:
NRAO, Socorro, NM, USA
Gregg Hallinan
Affiliation:
California Institute of Technology, Pasadena, CA, USA
Sumit Sarbadhicary
Affiliation:
Michigan State University, Lansing, MI, USA
Emil Polisensky
Affiliation:
NRL, Washington, DC, USA
Namir Kassim
Affiliation:
NRL, Washington, DC, USA
Wendy Peters
Affiliation:
NRL, Washington, DC, USA
Tracy Clarke
Affiliation:
NRL, Washington, DC, USA
Dipanjan Mukherjee
Affiliation:
IUCAA, Pune, India
Sjoert van Velzen
Affiliation:
New York University, New York, NY, USA University of Maryland, College Park, MD, USA
Vivienne Baldassare
Affiliation:
National Research Council fellow, resident at NRL, Washington, DC, USA
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Abstract

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As part of an on-going study of radio transients in Epoch 1 (2017–2019) of the Very Large Array Sky Survey (VLASS), we have discovered a sample of 0.2 < z < 3.2 active galactic nuclei (AGN) selected in the optical/infrared that have recently brightened dramatically in the radio. These sources would have previously been classified as radio-quiet based on upper limits from the Faint Images of the Radio Sky at Twenty-centimeters (FIRST; 1993-2011) survey; however, they are now consistent with radio-loud quasars. We present a quasi-simultaneous, multi-band (1–18 GHz) VLA follow-up campaign of our sample of AGN with extreme radio variability. We conclude that the radio properties are most consistent with AGN that have recently launched jets within the past few decades, potentially making them among the youngest radio AGN known.

Keywords

galaxies: activegalaxies: jetsgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 27 - 32
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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