Radio emission from accreting isolated black holes in our galaxy

Author:

Tsuna Daichi12,Kawanaka Norita34ORCID

Affiliation:

1. Research Center for the Early Universe (RESCEU), the University of Tokyo, Hongo, Tokyo 113-0033, Japan

2. Department of Physics, School of Science, the University of Tokyo, Hongo, Tokyo 113-0033, Japan

3. Department of Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan

4. Hakubi Center, Yoshida Honmachi, Sakyo-ku, Kyoto 606-8501, Japan

Abstract

ABSTRACT Apart from the few tens of stellar-mass black holes discovered in binary systems, an order of 108 isolated black holes (IBHs) are believed to be lurking in our Galaxy. Although some IBHs are able to accrete matter from the interstellar medium, the accretion flow is usually weak and thus radiatively inefficient, which results in significant material outflow. We study electron acceleration generated by the shock formed between this outflow and the surrounding material, and the subsequent radio synchrotron emission from accelerated electrons. By numerically calculating orbits of IBHs to obtain their spatial and velocity distributions, we estimate the number of IBHs detectable by surveys using SKA1-mid (SKA2) as ∼30 (∼700) for the most optimistic case. The SKA’s parallax measurements may accurately give their distances, possibly shedding light on the properties of the black holes in our Galaxy.

Funder

University of Tokyo

Japan Society for the Promotion of Science

Kyoto University

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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