paper

Accretion Geometry of Black Hole X-ray Binaries: Insights from X-ray Observations

arXiv:2603.00833 · doi:10.1007/s10509-026-04562-8

Abstract

The accretion-ejection activities of black holes play a vital role in shaping the Universe. Bright and recurrent black hole X-ray binaries are ideal objects for studying accretion physics across a wide range of accretion rates, providing insights into the understanding of their supermassive counterparts. This short review summarizes X-ray techniques capable of measuring accretion geometry, our current understanding, and open questions. In particular, X-ray spectroscopic studies indicate that the accretion disk can extend close to the innermost stable circular orbit in the bright hard state. Some hints of disk-corona-jet connections are also discussed.

52 pages, 7 figures, Accepted for publication in Astrophysics and Space Science

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