PEARLS: JWST Counterparts of Microjansky Radio Sources in the Time Domain Field

S. P. Willner, Hansung B. Gim, Maria del Carmen Polletta, Seth H. Cohen, Christopher N.A. Willmer, Xiurui Zhao, Jordan C.J. D’Silva, Rolf A. Jansen, Anton M. Koekemoer, Jake Summers, Rogier A. Windhorst, Dan Coe, Christopher J. Conselice, Simon P. Driver, Brenda Frye, Norman A. Grogin, Madeline A. Marshall, Mario Nonino, Rafael Ortiz, Nor PirzkalAaron Robotham, Michael J. Rutkowski, Russell E. Ryan, Scott Tompkins, Haojing Yan, Heidi B. Hammel, Stefanie N. Milam, Nathan J. Adams, John F. Beacom, Rachana Bhatawdekar, Cheng Cheng, F. Civano, W. Cotton, Minhee Hyun, Satoshi Kikuta, K. E. Nyland, W. M. Peters, Andreea Petric, Huub J.A. Röttgering, T. Shimwell, Min S. Yun

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The Time Domain Field (TDF) near the North Ecliptic Pole in JWST’s continuous-viewing zone will become a premier “blank field” for extragalactic science. JWST/NIRCam data in a 16 arcmin2 portion of the TDF identify 4.4 μm counterparts for 62 of 63 3 GHz sources with S(3 GHz) > 5 μJy. The one unidentified radio source may be a lobe of a nearby Seyfert galaxy, or it may be an infrared-faint radio source. The bulk properties of the radio-host galaxies are consistent with those found by previous work: redshifts range from 0.14-4.4 with a median redshift of 1.33. The radio emission arises primarily from star formation in ∼2/3 of the sample and from an active galactic nucleus (AGN) in ∼1/3, but just over half the sample shows evidence for an AGN either in the spectral energy distribution or by radio excess. All but three counterparts are brighter than magnitude 23 AB at 4.4 μm, and the exquisite resolution of JWST identifies correct counterparts for sources for which observations with lower angular resolution would misidentify a nearby bright source as the counterpart when the correct one is faint and red. Up to 11% of counterparts might have been unidentified or misidentified absent NIRCam observations.

Original languageEnglish (US)
Article number176
JournalAstrophysical Journal
Issue number2
StatePublished - Dec 1 2023

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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