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Astron. Astrophys. 358, L29-L32 (2000)


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Letter to the Editor

Disk mass accretion rate and infrared flares in GRS 1915+105

T. Belloni 1, S. Migliari 1,2 and R.P. Fender 3

1 Osservatorio Astronomico di Brera, Via. E. Bianchi 46, 23870, Merate, Italy (belloni@merate.mi.astro.it)
2 Università degli Studi di Milano, Dipartimento di Fisica, Via Celoria 16, 20133, Milano, Italy (migliari@merate.mi.astro.it)
3 University of Amsterdam, Astronomical Institute "Anton Pannekoek" and Center for High-Energy Astrophysics, Kruislaan 403, 1098 SJ, Amsterdam, The Netherlands (rpf@astro.uva.nl)

Received 17 March 2000 / Accepted 15 May 2000

Abstract

We have analyzed in detail a set of Rossi X-ray Timing Explorer (RXTE) observations of the galactic microquasar GRS 1915+105 corresponding to times when quasi-periodic oscillations in the infrared have been reported. From time-resolved spectral analysis, we have estimated the mass accretion rate through the (variable) inner edge of the accretion disk. We compare this accretion rate to an estimate of the mass/energy outflow rate in the jet. We discuss the possible implications of these results in terms of disk-instability and jet ejection, and in particular note an apparent anti-correlation between the accretion and ejection rates, implying that the gas expelled in the jet must leave the accretion disk before reaching its innermost radius.

Key words: accretion, accretion disks – stars: binaries: close – stars: individual: GRS 1915+105 – X-rays: stars

Send offprint requests to: T. Belloni

© European Southern Observatory (ESO) 2000

Online publication: June 8, 2000

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