中微子事件IC220624A候选射电对应体J1458+4121的VLBI观测研究  

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

作　　者：曾艾玲 杨小龙 赵薇 洪晓瑜 ZENG Ai-ling;YANG Xiao-long;ZHAO Wei;HONG Xiao-yu(School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]上海科技大学物质科学与技术学院,上海201210 [2]中国科学院上海天文台,上海200030 [3]中国科学院大学天文与空间科学学院,北京100049

出　　处：《天文学进展》2024年第2期276-285,共10页Progress In Astronomy

基　　金：国家重点研发专项(2018YFA0404602)。

摘　　要：收集并分析了中微子发射事件IC-220624A的候选体J1458+4121仅有的几次甚大天线阵(VLA)的历史数据;在此基础上,利用甚长基线阵列(VLBA)对其进行首次VLBI观测,观测波段为L和C波段。通过数据处理和分析研究,得到J1458+4121 VLBA的射电辐射形态。此外,利用相位参考技术,还获得J1458+4121更精确的坐标(α=14:58:20.772, δ=41:21:01.911)。VLA观测的射电总流量强度在1.4~8.4 GHz范围内呈下降趋势,说明J1458+4121的射电能谱可能是幂律谱;而VLBA观测的射电总流量强度在1.5~5 GHz范围内呈上升趋势,意味着其射电能谱在GHz波段是反转谱。因此,J1458+4121极有可能是一个年轻射电源,其中微子产生可能是由于新喷流成分的出现。该结果有助于J1458+4121的后续研究,并将中微子起源的关注对象从明亮的耀变体扩展至其他类型的活动星系核。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 rst 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 ux density observed by VLA decreases from 1.4 to 8.4 GHz,so its radio spectrum may be power-law.However,the total ux 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 bene cial 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.

关 键 词：中微子 活动星系核 甚长基线干涉测量 

分 类 号：P157.2[天文地球—天文学]