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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 225837.0, MPI für Astronomie / Publikationen_mpia
First detection of cold dust in the northern shell of NGC 5128 (Centaurus A)
Authors:Stickel, M.; van der Hulst, J. M.; van Gorkom, J. H.; Schiminovich, D.; Carilli, C. L.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Astronomy and Astrophysics
Volume:415
Start Page:95
End Page:102
Review Status:not specified
Audience:Not Specified
Abstract / Description:Deep far-infrared (FIR) imaging data obtained
with ISOPHOT at 90 ‚‚mu;m, 150 ‚‚mu;m, and 200
‚‚mu;m detected the thermal emission from cold
dust in the northern shell region of NGC 5128
(Centaurus A), where previously neutral hydrogen
and molecular gas has been found. A somewhat
extended FIR emission region is present in both
the 150 ‚‚mu;m and 200 ‚‚mu;m map, while only an
upper flux limit could be derived from the 90
‚‚mu;m data. The FIR spectral energy
distribution can be reconciled with a modified
blackbody spectrum with very cold dust color
temperatures and emissivity indices in the range
13 K ‚‚lt; TDust ‚‚lt; 15.5 K and 2
‚‚gt; ‚‚beta; ‚‚gt; 1, respectively, where the
data favor the low temperature end. A
representative value for the associated dust mass
is MDust ‚‚ap;
7‚‚times;104 M‚‚odot;,
which together with the HI gas mass gives a
gas-to-dust ratio of ‚‚ap;300, close the average
values of normal inactive spiral galaxies. This
value, in conjunction with the atomic to
molecular gas mass ratio typical for a spiral
galaxy, indicates that the interstellar medium
(ISM) from the inner part of a captured disk
galaxy is likely the origin of the outlying gas
and dust. These observations are in agreement
with recent theoretical considerations that in
galaxy interactions leading to stellar shell
structures the less dissipative clumpy component
of the ISM from the captured galaxy can lead to
gaseous shells. Alternatively, the outlying gas
and dust could be a rotating ring structure
resulting from an interaction or even late
infall of tidal material of a merger in the
distant past. With all three components (atomic
gas, molecular gas, dust) of the ISM present in
the northern shell region, local star formation
may account for the chains of young blue stars
surrounding the region to the east and north.
The dust cloud may also be involved in the
disruption of the large scale radio jet before
entering the brighter region of the northern
radio lobe.
Free Keywords:galaxies: individual: NGC 5128; galaxies:
; elliptical ‚‚amp; lenticular; cD; galaxies:
; intergalactic medium; infrared: general;
; infrared: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Astronomie, K‚‚ouml;nigstuhl 17, 69117
Heidelberg, Germany), AB(Kapteyn Astronomical
Institute, Postbus 800, 9700 AV Groningen, The
Netherlands), AC(Department of Astronomy,
Columbia University, New York, NY 10027, USA),
AD(Division of Physics, Mathematics, and
Astronomy, California Institute of Technology, MS
405-47, Pasadena, CA 91125, USA), AE(National
Radio Astronomy Observatory, PO Box 0, Socorro,
NM 87801, USA)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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