2001A&A...372..551B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST10:00:22

2001A&A...372..551B - Astronomy and Astrophysics, volume 372, 551-556 (2001/6-3)

The high-frequency QPOs in GRS 1915+105.

BELLONI T., MENDEZ M. and SANCHEZ-FERNANDEZ C.

Abstract (from CDS):

We analyzed two 1996 observations of the Galactic Microquasar GRS 1915+105 taken with the Proportional Counter Array on board the Rossi X-ray Timing Explorer. We focus on the properties of the high-frequency QPO as a function of the ``dip'' oscillations, a factor of 1000 slower. In one observation, 1996 May 5th, we find that the energy spectrum of the QPO at ∼65Hz changes drastically between the high-intervals and the dips, hardening during the dips to the point that the QPO peak is no longer detected at low energies. In the second observation, 1996 May 14th, although it has similar overall characteristics, the 65Hz QPO is not seen, but another broader QPO peak appears at 27Hz, only during the dips. This peak is too weak to obtain reliable information about its spectrum. Our results indicate that the presence/absence of high-frequency features in this enigmatic source are intimately linked to the slower oscillations and variations that happen on longer time scales.

Abstract Copyright:

Journal keyword(s): accretion: accretion disks - black hole physics - stars: black hole candidates: oscillations - X-rays: stars

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1699 1
2 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2281 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-10:00:22

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