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Astrophysics

Eclipses of Nearby Radio-Loud Galactic Nuclei by Stars in Nuclear Star Clusters

Michal Zajaček

Featured May 17, 2026

Original Paper

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Simply

Big stars orbiting giant black holes in nearby galaxies can briefly block the black hole's bright radio signal, creating eclipses that help scientists measure the black hole's weight and study its stellar neighborhood.

In depth
The paper introduces a novel method to detect stars orbiting supermassive black holes (SMBHs) by observing eclipses of the SMBH's radio core. It demonstrates that at millimeter wavelengths, the radio core shrinks sufficiently to be directly occulted by large evolved stars, allowing for the derivation of SMBH mass and constraints on the nuclear star cluster composition from observable eclipse properties.

Key Takeaways

  • 1
    The paper predicts that millimeter-wave eclipses of supermassive black hole radio cores by evolved stars are detectable in nearby active galactic nuclei.
  • 2
    These eclipses exhibit characteristic depths, durations, and recurrence timescales that are dependent on the properties of the occulting star and the black hole.
  • 3
    A key innovation is the derivation of a formula to estimate the SMBH mass using these observable eclipse parameters, offering a new astrophysical probe.

Conceptual Flow

HIGH LEVEL
1
How Stars Can Hide Black Hole Signals

Scientists figured out that big stars passing in front of a black hole's radio glow can make it temporarily dim, like a tiny eclipse.

Nearby Black Hole
Big Star
Star Passes In Front
Radio Signal Dims
2
What We Learn From These Eclipses

By watching how long and how deep these dimmings are, they can calculate the black hole's size and learn about the stars around it.

Eclipse Duration
Eclipse Depth
Calculate & Understand
Black Hole Mass
Star Cluster Info