2005A&A...430..435A


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.18CET06:11:39

2005A&A...430..435A - Astronomy and Astrophysics, volume 430, 435-442 (2005/2-1)

X-ray to UV variability correlation in MCG-6-30-15.

AREVALO P., PAPADAKIS I., KUHLBRODT B. and BRINKMANN W.

Abstract (from CDS):

We used a ∼300 ks long XMM-Newton observation of the Seyfert 1 galaxy MCG-6-30-15 to study the correlation between the 0.2-10keV X-ray and the 3000-4000Å U bands. We found a significant correlation peak at a time lag of τmax∼160ks where the UV flux variations preceded the variations in the X-ray band. We interpret this result as evidence in favour of Comptonisation models where the observed X-rays are produced through Compton up-scattering of thermal UV seed photons from an accretion disc, as this process naturally predicts the UV variations to precede similar flux variations in the X-rays. The length of the time lag favours models where the observed UV and the seed-photon-emitting regions are connected by perturbations of the accretion flow traveling inwards through the disc, affecting first the main U-band-emitting radii and then the innermost region where the bulk of the seed photons is expected to be produced. Finally, the absence of significant features in the correlation function with X-ray flux variations preceding those in the UV indicates that the observed U-band photons are not mainly produced through reprocessing of hard X-rays in this source.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - galaxies: active - galaxies: individual: MCG-6-30-15 - X-rays: individual: MCG-6-30-15

Simbad objects: 5

goto Full paper

goto View the reference in ADS

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 - 2020
#notes
1 NGC 3516 Sy1 11 06 47.4596406816 +72 34 07.189563769   13.12 12.40     ~ 1390 0
2 NGC 4051 Sy1 12 03 09.6098828919 +44 31 52.693714606   11.08 12.92 9.94   ~ 1954 1
3 ESO 383-35 Sy1 13 35 53.7686909139 -34 17 44.139127597   13.89 13.61 8.9   ~ 1361 0
4 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2336 0
5 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1845 3

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2005A&A...430..435A and select 'bookmark this link' or equivalent in the popup menu


2019.11.18-06:11:39

© Université de Strasbourg/CNRS

    • Contact