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The X-shaped Radio Galaxy J0725+5835 is Associated with an AGN Pair

Journal Article · · The Astrophysical Journal
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [8]
  1. Chinese Academy of Sciences (CAS), Shanghai (China); Peking University, Beijing (China). Kavli Institute for Astronomy and Astrophysics; Chinese Academy of Sciences (CAS), Shanghai (China)
  2. University of Strathclyde, Glasgow, Scotland (United Kingdom); Shanghai Normal University, Shanghai (China)
  3. Peking University, Beijing (China). Kavli Institute for Astronomy and Astrophysics; Indian Institute of Astrophysics, Bengaluru (India)
  4. Chinese Academy of Sciences (CAS), Shanghai (China); Chalmers University of Technology, Onsala (Sweden)
  5. Chinese Academy of Sciences (CAS), Shanghai (China)
  6. Peking University, Beijing (China). Kavli Institute for Astronomy and Astrophysics
  7. Brandeis University, Waltham, MA (United States)
  8. Raman Research Institute, Bangalore (India)
+ Show Author Affiliations
X-shaped radio galaxies (XRGs) are those that exhibit two pairs of unaligned radio lobes (main radio lobes and wings). One of the promising models for the peculiar morphology is jet reorientation. To clarify this, we conducted a 5 GHz observation with the European VLBI Network (EVN) of XRG J0725+5835, which resembles the archetypal binary active galactic nuclei (AGNs) 0402+379 in radio morphology, but it is larger in angular size. In our observation, two milliarcsecond-scale radio components with nonthermal radio emission are detected. Each of them coincides with an optical counterpart with similar photometric redshift and (optical and infrared) magnitude, corresponding to dual active nuclei. Furthermore, with the improved Very Large Array (VLA) images, we find a bridge between the two radio cores and a jet bending in the region surrounding the companion galaxy. This further supports the interplay between the main and companion galaxies. In addition, we also report the discovery of an arcsecond-scale jet in the companion. Given the projected separation of ~100 kpc between the main and companion galaxies, XRG J0725+5835 is likely associated with a dual jetted-AGN system. In both EVN and VLA observations, we find signatures that the jet is changing its direction, which is likely responsible for the X-shaped morphology. For the origin of jet reorientation, several scenarios are discussed.
Research Organization:
University of Pittsburgh, PA (United States)
Sponsoring Organization:
China Postdoctoral Science Foundation; Chinese Academy of Sciences; National Key R&D Programme of China; National Science Foundation of China; Shanghai Sailing Program; USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0007914
OSTI ID:
1981257
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 933; ISSN 0004-637X
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
active galactic nuclei
galaxies
galaxy pairs
interacting galaxies
radio galaxies
radio jets
very long baseline interferometry