HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Multiwavelength campaign on Mrk 509. I. Variability and spectral energy distribution

Abstract : Context. Active galactic nuclei (AGN) show a wealth of interesting physical processes, some of which are poorly understood. In a broader context, they play an important role in processes that are far beyond their immediate surroundings, owing to the high emitted power.
Aims: We want to address a number of open questions, including the location and physics of the outflow from AGN, the nature of the continuum emission, the geometry and physical state of the X-ray broad emission line region, the Fe-K line complex, the metal abundances of the nucleus, and finally the interstellar medium of our own Galaxy as seen through the signatures it imprints on the X-ray and UV spectra of AGN.
Methods: We study one of the best targets for these aims, the Seyfert 1 galaxy Mrk 509 with a multiwavelength campaign using five satellites (XMM-Newton, INTEGRAL, Chandra, HST, and Swift) and two ground-based facilities (WHT and PAIRITEL). Our observations cover more than five decades in frequency, from 2 μm to 200 keV. The combination of high-resolution spectroscopy and time variability allows us to disentangle and study the different components. Our campaign covers 100 days from September to December 2009, and is centred on a simultaneous set of deep XMM-Newton and INTEGRAL observations with regular time intervals, spanning seven weeks.
Results: We obtain a continuous light curve in the X-ray and UV band, showing a strong, up to 60% flux increase in the soft X-ray band during the three weeks in the middle of our deepest monitoring campaign, and which is correlated with an enhancement of the UV flux. This allows us to study the time evolution of the continuum and the outflow. By stacking the observations, we have also obtained one of the best X-ray and UV spectra of a Seyfert galaxy ever obtained. In this paper we also study the effects of the spectral energy distribution (SED) that we obtained on the photo-ionisation equilibrium. Thanks to our broad-band coverage, uncertainties on the SED do not strongly affect the determination of this equilibrium.
Conclusions: Here we present our very successful campaign and in a series of subsequent papers we will elaborate on different aspects of our study.
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03623401
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Tuesday, March 29, 2022 - 5:06:34 PM
Last modification on : Monday, May 16, 2022 - 8:20:25 AM

File

aa16869-11.pdf
Publisher files allowed on an open archive

Licence


Distributed under a Creative Commons Attribution 4.0 International License

Identifiers

Collections

Citation

J. S. Kaastra, P. -O. Petrucci, M. Cappi, N. Arav, E. Behar, et al.. Multiwavelength campaign on Mrk 509. I. Variability and spectral energy distribution. Astronomy and Astrophysics - A&A, EDP Sciences, 2011, 534, ⟨10.1051/0004-6361/201116869⟩. ⟨insu-03623401⟩

Share

Metrics

Record views

19

Files downloads

1