This paper reports the detection and localization of the repeating FRB 20190520B, which is co-located with a compact, persistent radio source and associated with a dwarf host galaxy of high specific-star-formation rate at a redshift of 0.241 ± 0.001. The high host-galaxy dispersion measure (DM) of approximately 903 pc cm⁻³ far exceeds the intergalactic medium's DM contribution, cautioning against redshift inference for FRBs without accurate host-galaxy identification. The FRB exhibits a high burst rate and complex structure. The co-located radio source is compact and likely physically connected to the FRB, similar to FRB 20121102A. This finding suggests a potential connection between burst activity, the presence of a persistent radio source, and high DM in some FRBs.

C.-H. Niu, K. Aggarwal, D. Li, X. Zhang, S. Chatterjee, C.-W. Tsai, W. Yu, C. J. Law, S. Burke-Spolaor, J. M. Cordes, Y.-K. Zhang, S. K. Ocker, J.-M. Yao, P. Wang, Y. Feng, Y. Niino, C. Bochenek, M. Cruces, L. Connor, J.-A. Jiang, S. Dai, R. Luo, G.-D. Li, C.-C. Miao, J.-R. Niu, R. Anna-Thomas, J. Sydnor, D. Stern, W.-Y. Wang, M. Yuan, Y.-L. Yue, D.-J. Zhou, Z. Yan, W.-W. Zhu, B. Zhang