The swan song: the disappearance of the nucleus of NGC 4051 and the echo of its past glory

Details The swan song: the disappearance of the nucleus of NGC 4051 and the echo of its past glory The swan song: the disappearance of the nucleus of NGC 4051 and the echo of its past glory

1998-07-21

arxiv.org/abs/astro-ph/9807213v2

Astronomy and Astrophysics

Astrophysics

5 pages, Latex, 3 Postscript figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.1998.02089.x

BeppoSAX observed the low-luminous Seyfert 1 Galaxy NGC4051 in a ultra-dim X-ray state. The 2-10 keV flux (1.26 x 10^{-12} erg/cm^2/s) was about 20 times fainter than its historical average value, and remained steady along the whole observation (~2.3 days). The observed flat spectrum (\Gamma ~ 0.8) and intense iron line (EW ~600 eV) are best explained assuming that the active nucleus has switched off, leaving only a residual reflection component visible.

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