Anticorrelated Hard X‐Ray Time Lag in GRS 1915+105: Evidence for a Truncated Accretion Disk | Zendy

Manojendu Choudhury | Zendy; A. R. Rao | Zendy; Surajit Dasgupta | Zendy; Jayant Pendharkar | Zendy; K. Sriram | Zendy; V. K. Agrawal | Zendy

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Anticorrelated Hard X‐Ray Time Lag in GRS 1915+105: Evidence for a Truncated Accretion Disk

Author(s) -

Manojendu Choudhury,

A. R. Rao,

Surajit Dasgupta,

Jayant Pendharkar,

K. Sriram,

V. K. Agrawal

Publication year - 2005

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 - 10.1086/432675

Subject(s) - physics , astrophysics , superluminal motion , accretion (finance) , radius , accretion disc , black hole (networking) , jet (fluid) , oscillation (cell signaling) , lag , astronomy , mechanics , computer network , routing protocol , routing (electronic design automation) , computer security , biology , computer science , genetics , link state routing protocol

Multi-wavelength observations of Galactic black hole candidate sourcesindicate a close connection between the accretion disk emission and the jetemission. The recent discovery of an anti-correlated time lag between the softand hard X-rays in Cygnus X-3 (Choudhury & Rao 2004) constrains the geometricpicture of the disk-jet connection into a truncated accretion disk, thetruncation radius being quite close to the black hole. Here we report thedetection of similar anti-correlated time lag in the superluminal jet sourceGRS 1915+105. We show the existence of the pivoting in the X-ray spectrumduring the delayed anti-correlation and we also find that the QPO parameterschange along with the spectral pivoting. We explore theoretical models tounderstand this phenomenon.Comment: Accepted in ApJ: (to appear on 1 Oct, 2005 issue

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