VLBI Observations for J1458+4121 the Candidate of Radio Counterpart of the Neutrino Event IC220624A

Subjects: Astronomy submitted time 2024-07-03 Cooperative journals: 《天文学进展》

ZENG Ai-ling YANG Xiao-long ZHAO Wei HONG Xiao-yu

Abstract： We have collected and analyzed the limited the Very Large Array (VLA) archival data of J1458+4121, which is a possible candidate of neutrino event IC-220624A, based on which we observed the source first time with the Very Long Baseline Array (VLBA) at L and C bands. Through data processing and analysis, we obtained the VLBA images of J1458+4121. In addition, its more precise coordinate (α=14:58:20.772, δ=41:21:01.911) was obtained by phase reference technique. The total flux density observed by VLA decreases from 1.4 to 8.4 GHz, so its radio spectrum may be power-law. However, the total flux density observed by VLBA shows an increasing trend from 1.5 to 5 GHz, which means an inversted spectrum in the GHz band. Therefore, it is highly likely that J1458+4121 is a young radio source, and its neutrino production may be caused by the emergence of a new jet component. The results of this paper are beneficial to the follow-up study of J1458+4121, and extend the focus on neutrino origin from bright blazars to other types of active galactic nuclei.

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