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Joint MPE, AIP, ESO workshop on Observational and theoretical progress in the study of Narrow-line Seyfert 1 galaxies

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Joint MPE, AIP, ESO workshop on
"Observational and theoretical progress in the study
of Narrow-line Seyfert 1 galaxies"

WE-Heraeus-seminar no. 226

Physikzentrum Bad Honnef, December 8-11, 1999

Proceedings / Papers

Conference Photos


    Narrow-Line Seyfert 1 galaxies are a peculiar but important group of Seyfert 1s that have Balmer lines of hydrogen that are only slightly broader than their forbidden lines. They tend to have strong Fe II and weak [O III] lines, and they thus tend to lie at one extreme of the Boroson & Green Eigenvector. ROSAT, ASCA and SAX observations have shown many Narrow-Line Seyfert 1 galaxies to have characteristic, unique and extreme X-ray properties. These include strong soft X-ray excess emission, extremely rapid and large-amplitude X-ray variability, steep 2-10 keV power-law continua, and unusual discrete spectral features. These X-ray observations indicate that Narrow-Line Seyfert 1s are not rare and represent a substantial part of the Seyfert population. The origin of the distinctive X-ray/optical properties is yet unknown, but is plausibly linked to an extreme value of a primary physical parameter: the accretion rate, nuclear orientation and black hole spin have been suggested. Because of their extreme properties, the study of Narrow-Line Seyfert 1s should allow us to progress in solving the diverse problems more generally posed by the Seyfert phenomenon.
    The study of Narrow-Line Seyfert 1s at all wavelengths is an important and rapidly growing field of research. The aim of this workshop is to provide a platform for intense discussions on the multiwavelength properties of these objects and for the theoretical modelling in preparation for observations with the next generation of X-ray observatories as well as other multiwavelength facilities.

Confirmed invited speakers:

    Th. Boller, W.N. Brandt, S. Collin-Souffrin, A. Comastri, A.C. Fabian, D. Grupe, G. Hasinger, A. Laor, K. Leighly, S. Mathur, H. Netzer, B. Peterson, J. Poutanen, M. Ward, B. Wills

Scientific topics:

  • NLS1 observations
    X-ray spectral/variability studies of the black hole regions of NLS1
    Optical and ultraviolet observations of NLS1 emission lines and continua
    Infrared and radio properties of NLS1
    Polarization studies of NLS1
    Ionized absorbers at X-ray and ultraviolet wavelengths
    Reverberation mapping and other studies of line variability
    NLS1 host galaxies and their interactions
    Newly discovered NLS1
    NLS1 surveys and population statistics
    The contribution to the soft X-ray background
    Line and continuum correlations
    Connections between NLS1 and BALQSOs
    Connections between NLS1 and Galactic Black Hole candidates
    Luminosity effects; The highest and lowest luminosity NLS1

  • Physical Models
    Models for the black hole regions of NLS1
    The origin of the extreme soft X-ray excesses
    Thin and thick accretion disks in NLS1
    The accretion disk coronae of NLS1
    The origin of the extreme X-ray variability in NLS1
    Interpretation of line and continuum correlations
    Models for the Broad Line Region and X-ray/UV absorption
    The effect of the ionizing continuum shape on emission and absorption spectral studies
    Orientation effects

  • Future Research Directions
    What science goals should drive future research on NLS1?
    The next generation of X-ray observatories: ABRIXAS, AXAF, XMM and ASTRO-E
    Grating X-ray spectroscopy: What can it tell us?
    Future plans for optical and ultraviolet monitoring of NLS1

Address for Communication:
Thomas Boller
Max-Planck-Institut für extraterrestrische Physik
Postfach 1603
D-85748 Garching
fax  : +49-89-30000-3569
phone: +49-89-30000-3883
email: ls1-workshop @ xray . mpe . mpg . de 

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Scientific Organizing Committee:

Jacqueline Bergeron (ESO), Thomas Boller (MPE), Niel Brandt (Penn State, USA), Suzy Collin-Souffrin (France), Reinhard Genzel (MPE), Dirk Grupe (MPE), Günther Hasinger (AIP), Karen Leighly (Columbia, USA), Hagai Netzer (Tel Aviv, Israel), Joachim Trümper (MPE), Marie-Helene Ulrich (ESO), Martin Ward (Leicester, UK)

Place and Date:

Hauptstrasse 5
D-53604 Bad Honnef (near Bonn)
December 8-11, 1999

Airport: Koeln/Bonn (38km)

travel information

Format of the workshop:

Invited talks, contributed talks, posters
Symposium is supported by the 'Wilhelm und Else Heraeus-Stiftung' (WE-Heraeus foundation)
Conference fee (including Board and lodging): 350 DM

© X-Ray Group at MPE (group)
last update:2000/08/29 07:16:41, editor of this page:Th. Boller

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