EDP Sciences
Free access
Volume 412, Number 1, December II 2003
Page(s) 229 - 233
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20031388

A&A 412, 229-233 (2003)
DOI: 10.1051/0004-6361:20031388

Does GRS 1915+105 exhibit "canonical" black-hole states?

P. Reig1, T. Belloni2 and M. van der Klis3

1  G.A.C.E, Instituto de Ciencias de los Materiales, University of Valencia, PO Box 22085, 46071 Paterna, Valencia, Spain
2  Osservatorio Astronomico di Brera, via E. Bianchi 46, 23807 Merate (LC), Italy
3  Astronomical Institute "Anton Pannekoek", University of Amsterdam and Center for High-Energy Astrophysics, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands

(Received 15 May 2003 / Accepted 29 August 2003 )

We have analysed RXTE data of the superluminal source GRS 1915+105 in order to investigate if, despite its extreme variability, it also exhibits the canonical source states that characterise other black-hole candidates. The phenomenology of GRS 1915+105 has been described in terms of three states (named A, B and C) based on their hardness ratios and position in the colour-colour diagram. We have investigated the connection between these states and the canonical behaviour and found that the shape of the power spectral continuum and the values of the best-fit model parameters to the noise components in all three states indicate that the source shows properties similar to the canonical very high state.

Key words: stars: individual: GRS 1915+105 -- binaries: close -- X-rays: binaries -- accretion: accretion disc

Offprint request: P. Reig, pablo.reig@uv.es

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