Very long baseline interferometry observation of the triple AGN candidate J0849+1114

Abstract

In the hierarchical structure formation model, galaxies grow through various merging events. Numerical simulations indicate that the mergers can enhance the activity of the central supermassive black holes in the galaxies. Pfeifle et al. (2019a) identified a system of three interacting galaxies, J0849$+$1114, and provided multiwavelength evidence of all three galaxies containing active galactic nuclei. The system has substantial radio emission, and with high-resolution radio interferometric observation we aimed to investigate its origin, whether it is related to star formation or to one or more of the active galactic nuclei in the system. We performed high-resolution continuum observation of J0849$+$1114 with the European Very Long Baseline Interferometry Network at $1.7$ GHz. We detected one compact radio emitting source at the position of the easternmost nucleus. Its high brightness temperature and radio power indicate that the radio emission originates from a radio-emitting active galactic nucleus. Additionally, we found that significant amount of flux density is contained in $\sim 100$ milliarcsec-scale feature related to the active nucleus.

arXiv comment4 pages, 2 figures, 1 table; accepted for publication in Astronomy & Astrophysics Letters

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• A Triple AGN in a Mid-Infrared Selected Late Stage Galaxy Merger
• Radio-loud Quasars above Redshift 4: VLBI Imaging of an Extended Sample
• Very Large Array Multi-band Radio Imaging of the Triple AGN Candidate SDSS J0849+1114
• Revealing faint compact radio jets at redshifts above 5 with very long baseline interferometry
• What is Inside the Double-Double Structure of the Radio Galaxy J0028+0035?