The 590 Day Long-Term Periodicity of the Microquasar GRS 1915+105 | Zendy

A. Rau | Zendy; J. Greiner | Zendy; Michael L. McCollough | Zendy

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The 590 Day Long-Term Periodicity of the Microquasar GRS 1915+105

Author(s) -

A. Rau,

J. Greiner,

Michael L. McCollough

Publication year - 2003

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 - 10.1086/376683

Subject(s) - precession , astrophysics , physics , accretion disc , flux (metallurgy) , term (time) , interferometry , telescope , accretion (finance) , radio telescope , astronomy , materials science , metallurgy

We report on the discovery of a 590 days long term periodicity in the hardX-ray component of the microquasar \grs found from a comprehensive study ofmore than four years of {\it RXTE} observations. The periodicity is alsoobserved in the hard X-ray flux observed by BATSE, and in the radio flux asseen with the {\it Green Bank Interferometer} and the {\it Ryle Telescope}. Wediscuss various possible explanations, including the precession of a radiationinduced warped accretion disk.Comment: 6 pages, 4 figuers, accepted for publication as ApJ Lette

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