Volume 387, Number 1, May III 2002
|Page(s)||215 - 221|
|Section||Interstellar and circumstellar matter|
|Published online||15 May 2002|
Evidence for a relativistic iron line in GRS 1915+105
Dipartimento di Fisica, Università degli Studi “Roma Tre”, Via della Vasca Navale 84, 00146 Roma, Italy
2 Astronomical Institute, Charles University Prague, Faculty of Mathematics and Physics, V Holešovičkách 2, CZ–180 00 Praha, The Czech Republic
3 Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate, Italy
4 IAS/CNR, Area di Ricerca di Tor Vergata, Via Fosso del Cavaliere 100, 00133 Roma, Italy
Corresponding author: A. Martocchia, firstname.lastname@example.org
Accepted: 5 March 2002
We report on the discovery of a relativistic iron Kα fluorescent emission line in the BeppoSAX spectrum of the microquasar GRS 1915+105, taken on April 19, 1998, when the line was unusually intense. The feature is broad and skewed, clearly indicating emission from the innermost regions of the accretion disc. The inner emitting orbit is larger than the innermost stable orbit, even in Schwarzschild metric: thus, a non-zero BH spin is not required by these data.
Key words: black hole physics / relativity / line: formation / line: profiles / X-rays: individuals: GRS 1915+105
© ESO, 2002
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