A Study of the Radio Spectrum of Mrk 421

• Main Authors: Lee, Jee Won, Lee, Sang-Sung, Hodgson, Jeffrey, Algaba, Juan Carlos, Kim, Sanghyun, Cheong, Whee Yeon, Jeong, Hyeon-Woo, Kang, Sincheol
• Format: Article
• Published: IOP Publishing Ltd 2024
• Subjects: QC Physics
• Online Access: http://eprints.um.edu.my/45369/; https://doi.org/10.3847/1538-4357/ad2c91
• Institution: Universiti Malaya

We present the results of a spectral analysis using simultaneous multifrequency (22, 43, 86, and 129 GHz) very long baseline interferometry (VLBI) observations of the Korean VLBI Network on BL Lac object, Markarian 421. The data we used were obtained from 2013 January to 2018 June. The light curves...