Query : 2001A&A...365L.146B

2001A&A...365L.146B - Astronomy and Astrophysics, volume 365, L146-151 (2001/1-1)

Detection of an X-ray periodicity in the narrow-line Seyfert 1 galaxy Mrk 766 with XMM-Newton.


Abstract (from CDS):

We have analyzed the timing properties of the Narrow-line Seyfert 1 galaxy Mrk 766 observed with XMM-Newton during the PV phase. The source intensity changes by a factor of 1.3 over the 29000 s observation. If the soft excess is modeled by a black body component, as indicated by the EPIC pn data, the luminosity of the black body component scales with its temperature according to L∼T4. This requires a lower limit ``black body size'' of about 1.3x1025cm2. In addition, we report the detection of a strong periodic signal with 2.4x10–4Hz. Simulations of light curves with the observed time sequence and phase randomized for a red noise spectrum clearly indicate that the periodicity peak is intrinsic to the distant AGN. Furthermore, its existence is confirmed by the EPIC MOS and RGS data. The spectral fitting results show that the black body temperature and the absorption by neutral hydrogen remain constant during the periodic oscillations. This observational fact tends to rule out models in which the intensity changes are due to hot spots orbiting the central black hole. Precession according to the Bardeen-Petterson effect or instabilities in the inner accretion disk may provide explanations for the periodic signal.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: Mrk 766 - X-rays: galaxies

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 NGC 4253 Sy1 12 18 26.5163572920 +29 48 46.531535472   14.34 13.57     ~ 1039 1
2 FRL 49 Sy2 18 36 58.2335883144 -59 24 08.282326320   11.1   14.19   ~ 245 0
3 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2626 0

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