Detection of a 5-Hz QPO from X-ray Nova GRS 1739-278

Details Detection of a 5-Hz QPO from X-ray Nova GRS 1739-278 Detection of a 5-Hz QPO from X-ray Nova GRS 1739-278

1999-11-16

arxiv.org/abs/astro-ph/9911290v2

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures, accepted for publication in ApJ Letters

Scientific paper

The X-ray nova GRS1739-278 flared up near the Galactic center in the spring of 1996. Here we report on the discovery of a ~5-Hz quasi-periodic oscillations (QPO) in RXTE/PCA observations of GRS1739-278. The QPO were only present when the source was in its very high state, and disappeared later, when it made a transition down into the high state. We present the energy spectra of this black hole candidate measured in both high and very high states, and discuss the similarities between this system and other X-ray transients.

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