2003A&A...412..235N


Query : 2003A&A...412..235N

2003A&A...412..235N - Astronomy and Astrophysics, volume 412, 235-240 (2003/12-2)

A transient variable 6 Hz QPO from GX 339-4.

NESPOLI E., BELLONI T., HOMAN J., MILLER J.M., LEWIN W.H.G., MENDEZ M. and VAN DER KLIS M.

Abstract (from CDS):

We report the results of an observation with the Rossi X-ray Timing Explorer of the black hole candidate GX 339-4 during its 2002/2003 outburst. This observation took place during a spectral transition from the hard to the soft state. A strong (6% rms) transient quasi-periodic oscillation (QPO) appears suddenly in the power density spectrum during this observation. The QPO centroid is ∼6Hz, but it varies significantly between 5 and 7Hz with a characteristic time scale of ∼10s, correlated with the 2-30keV count rate. The appearance of the QPO is related to spectral hardening of the flux, due to a change in the relative contribution of the soft and hard spectral components. We compare this peculiar behavior with results from other systems that show similar low frequency QPO peaks, and discuss the results in terms of possible theoretical models for QPO production.

Abstract Copyright:

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

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* GU Mus HXB 11 26 26.5961559600 -68 40 32.877752952           K3V-K7V 715 1
2 V* V381 Nor HXB 15 50 58.6637920704 -56 28 35.258385000   17.95 16.6     K3III 1182 0
3 V* V821 Ara HXB 17 02 49.3876391280 -48 47 23.087954544 16.20 16.30 15.5     ~ 2097 0
4 V* V2606 Oph CV* 17 42 40.030 -27 44 52.70     23.2     ~ 151 0
5 V* V406 Vul HXB 18 58 41.580 +22 39 29.40 15.00 15.65 15.31     G5V-K0V 381 0

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