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Astrobites

Astrobites

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Graduate-student summaries of recent astrophysics papers.

Feeding Time at the AGN Zoo
News•Mar 4, 2026

Feeding Time at the AGN Zoo

The paper links Fermi‑detected blazars and radio galaxies through their accretion and jet radiation mechanisms, analyzing 838 BL Lacs, 784 FSRQs, 55 LERGs and 17 HERGs. Gamma‑ray photon index versus luminosity separates BL Lacs from FSRQs and shows HERGs align with FSRQs while LERGs resemble BL Lacs. Using the distance‑independent Compton Dominance parameter, the authors identify a low‑accretion SSC regime for BL Lacs/LERGs and a high‑accretion EC regime for FSRQs/HERGs. The results bolster the unified AGN model, attributing observed differences largely to viewing angle.

By Astrobites
A Wandering Supermassive Black Hole Eating a Star
News•Mar 2, 2026

A Wandering Supermassive Black Hole Eating a Star

Astronomers have identified AT2024tvd, a tidal disruption event occurring 0.8 kiloparsecs (≈2,600 light‑years) from the nucleus of a massive galaxy 600 million light‑years away. Multi‑wavelength observations from ZTF, Swift, Pan‑STARRS, and XMM‑Newton were modeled with the kerrSED accretion‑disk framework, revealing a black hole...

By Astrobites