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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 358856.1, MPI für Astronomie / Publikationen_mpia
The spectral energy distribution of the central parsecs region of galaxies
Authors:Prieto, M. A.; Reunanen, J.; Beckert, Th; Tristram, K.; Neumayer, N.; Fernandez, J. A.; Acosta, J.
Language:English
Publisher:ASP
Place of Publication:San Francisco
Date of Publication (YYYY-MM-DD):2007
Title of Proceedings:The Central Engine of Active Galactic Nuclei
Title of Series:ASP Conf. Ser.
Volume (in Series):373
Review Status:not specified
Audience:Experts Only
Abstract / Description:Genuine spectral energy distributions (SED) of the central few parsec region of the nearest and brightest active galaxies in the southern hemisphere are presented. These are compiled from very high-spatial resolution data taken from radio (VLBA), IR adaptive optics and interferometry, and optical (HST) observations. The new SEDs are characterized by two main emission bumps, each peaking in the X-ray and IR, respectively, as it is known from optically obscured galactic nuclei. Yet, the shape of the IR SED largely departs from that derived from large-aperture data. They reveal two new features: (1) a very sharp decay at wavelengths shortward of 2 mum, plausibly a consequence of the heavy extinction towards the core region; and (2) a flattening in the 10-20 mum range and a further turnover toward longer wavelengths. Moreover, the true bolometric luminosity of these few parsec core regions turns out to be about an order of magnitude lower than previously estimated on the basis of IRAS/ISO data. These findings indicate that large-aperture IR data may be largely dominated by the host galaxy contribution, and warn over interpretations of IR/X-ray and IR/optical correlations based on large-aperture IR data that have been used to differentiate AGN from normal galaxy populations. The newly derived IR bolometric luminosities still exceed the output energy measured in the high energies by factors 3 to 60. On the expectation that both luminosities should be comparable within an order of magnitude, the reduced factors between both suggests that the derived
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2007ASPC..373..600P [ID No:1]
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