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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 198567.0, MPI für Astronomie / Publikationen_mpia
The infrared spectral energy distribution of
the Seyfert 2 prototype NGC 5252
Authors:Prieto, M. Almudena; Acosta-Pulido, J. A.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:The Astrophysical Journal
Journal Abbrev.:The Astrophysical Journal
Volume:583
Start Page:689
End Page:694
Review Status:not specified
Audience:Not Specified
Abstract / Description:The complete mid- to far-infrared continuum
energy distribution collected with the Infrared
Space Observatory of the Seyfert 2 prototype NGC
5252 is presented. ISOCAM images taken in the
3-15 mu;m show a resolved central source that
is consistent at all bands with a region of
about 1.3 kpc in size. Because of the lack of
ongoing star formation in the disk of the
galaxy, this resolved emission is associated with
either dust heated in the nuclear active region
or bremsstrahlung emission from the nuclear and
extended ionized gas. The size of the mid-IR
emission contrasts with the standard unification
scenario envisaging a compact dusty structure
surrounding and hiding the active nucleus and the
broad-line region. The mid-IR data are
complemented by ISOPHOT aperture photometry in
the 25-200 mu;m range. The overall IR spectral
energy distribution is dominated by a
well-defined component peaking at ~100 mu;m, a
characteristic temperature of T~=20 K, and an
associated dust mass of
2.5 times;107 Msolar,
which greatly dominates the total dust mass
content of the galaxy. The heating mechanism of
this dust is probably the interstellar radiation
field. After the contribution of this cold dust
component is subtracted, the bulk of the
residual emission is attributed to dust heated
within the nuclear environment. Its luminosity
consistently accounts for the reprocessing of
the X-ray to UV emission derived for the nucleus
of this galaxy. The comparison of NGC 5252's
spectral energy distribution with current torus
models favors large nuclear disk structure on the
kiloparsec scale.
Free Keywords:Galaxies: Active; Galaxies: Individual: NGC
; Number: NGC 5252; Galaxies: Photometry;
; Galaxies: Seyfert; Infrared: Galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Garching, Germany; and Instituto de
Astrof iacute;sica de Canarias, La Laguna,
Spain; <EMAIL>aprieto@eso.org</EMAIL>),
AB(Instituto de Astrof iacute;sica de Canarias,
La Laguna, Spain; <EMAIL>jap@ll.iac.es</EMAIL>)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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