Gamma‐Ray Emission from Advection‐dominated Accretion Flows around Black Holes: Application to the Galactic Center | Zendy

Rohan Mahadevan | Zendy; Ramesh Narayan | Zendy; Julian H. Krolik | Zendy

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Gamma‐Ray Emission from Advection‐dominated Accretion Flows around Black Holes: Application to the Galactic Center

Author(s) -

Rohan Mahadevan,

Ramesh Narayan,

Julian H. Krolik

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/304499

Subject(s) - physics , galactic center , astrophysics , supermassive black hole , accretion (finance) , black hole (networking) , advection , flux (metallurgy) , active galactic nucleus , intermediate mass black hole , gamma ray burst progenitors , pion , gamma ray , power law , astronomy , spin flip , galaxy , nuclear physics , thermodynamics , link state routing protocol , materials science , mathematics , computer network , routing protocol , statistics , routing (electronic design automation) , computer science , metallurgy

We calculate the flux and spectrum of \gamma-rays emitted by atwo-temperature advection-dominated accretion flow (ADAF) around a black hole.The \gamma-rays are from the decay of neutral pions produced throughproton-proton collisions. We discuss both thermal and power-law distributionsof proton energies and show that the \gamma-ray spectra in the two cases arevery different. We apply the calculations to the \gamma-ray source, 2EGJ1746-2852, detected by EGRET from the direction of the Galactic Center. Weshow that the flux and spectrum of this source are consistent with emissionfrom an ADAF around the supermassive accreting black hole Sgr A^* if the protondistribution is a power-law. The model uses accretion parameters within therange made likely by other considerations. If this model is correct, itprovides evidence for the presence of a two temperature plasma in Sgr A^*, andpredicts \gamma-ray fluxes from other accreting black holes which could beobserved with more sensitive detectors.Comment: 19 pages (Latex), 4 Figures. ApJ 486. Revised Tables and Figure

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