SIMBAD references

2007ApJ...666...96M - Astrophys. J., 666, 96-108 (2007/September-1)

Monitoring the violent activity from the inner accretion disk of the Seyfert 1.9 galaxy NGC 2992 with RXTE.

MURPHY K.D., YAQOOB T. and TERASHIMA Y.

Abstract (from CDS):

We present the results of a 1 year monitoring campaign of the Seyfert 1.9 galaxy NGC 2992 with RXTE. Historically, the source has been shown to vary dramatically in 2-10 keV flux over timescales of years and was thought to be slowly transitioning between periods of quiescence and active accretion. Our results show that in 1 year the source continuum flux covered almost the entire historical range, making it unlikely that the low-luminosity states correspond to the accretion mechanism switching off. During flaring episodes we found that a highly redshifted Fe K line appears, implying that the violent activity is occurring in the inner accretion disk, within ∼100 gravitational radii of the central black hole. We also found that the spectral index of the X-ray continuum remained approximately constant during the large amplitude variability. These observations make NGC 2992 well-suited for future multiwaveband monitoring, as a test bed for constraining accretion models.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: Seyfert - Line: Profiles - X-rays: individual (NGC 2992)

Simbad objects: 9

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