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First detection of cold dust in the northern shell of NGC 5128 (Centaurus A)

Stickel, M. and van der Hulst, J. M. and Van Gorkom, J. H. and Schiminovich, D. and Carilli, C. L. (2004) First detection of cold dust in the northern shell of NGC 5128 (Centaurus A). Astronomy & Astrophysics, 415 (1). pp. 95-102. ISSN 0004-6361. doi:10.1051/0004-6361:20034314.

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Deep far-infrared (FIR) imaging data obtained with ISOPHOT at 90 µm, 150 µm, and 200 µm 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 µm and 200 µm map, while only an upper flux limit could be derived from the 90 µm 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 < T_(Dust) < 15.5 K and 2 > β > 1, respectively, where the data favor the low temperature end. A representative value for the associated dust mass is M_(Dust) ≈ 7 x 10^4 M_⊙, which together with the HI gas mass gives a gas-to-dust ratio of ≈ 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.

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Carilli, C. L.0000-0001-6647-3861
Additional Information:© 2004 ESO. Received: 12 September 2003. Accepted: 3 November 2003. The development and operation of ISOPHOT were supported by MPIA and funds from Deutsches Zentrum für Luft- und Raumfahrt (DLR, formerly DARA). The ISOPHOT Data Centre at MPIA is supported by Deutsches Zentrum für Luft- und Raumfahrt (DLR) with funds of Bundesministerium für Bildung und Forschung, grant. no. 50 QI0201. This research has made use of NASA's Astrophysics Data System Abstract Service, the Simbad Database, operated at CDS, Strasbourg, France, and data from the Infrared Processing and Analysis Center (IPAC) and the NASA/IPAC Extragalactic Database (NED), which are operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Based on photographic data obtained using The UK Schmidt Telescope. The UK Schmidt Telescope was operated by the Royal Observatory Edinburgh, with funding from the UK Science and Engineering Research Council, until 1988 June, and thereafter by the Anglo-Australian Observatory. Original plate material is copyright © the Royal Observatory Edinburgh and the Anglo-Australian Observatory. The plates were processed into the present compressed digital form with their permission. The Digitized Sky Survey was produced at the Space Telescope Science Institute under US Government grant NAG W-2166.
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Max Planck Institute for Astronomy (MPIA)UNSPECIFIED
Deutsches Zentrum für Luft- und Raumfahrt (DLR)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)50 QI0201
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:Key words: elliptical & lenticular, cD - galaxies: intergalactic medium - infrared: general - infr
Issue or Number:1
Record Number:CaltechAUTHORS:20180223-115732770
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Official Citation:First detection of cold dust in the northern shell of NGC 5128 (Centaurus A) M. Stickel, J. M. van der Hulst, J. H. van Gorkom, D. Schiminovich and C. L. Carilli A&A, 415 1 (2004) 95-102 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84939
Deposited By: Ruth Sustaita
Deposited On:24 Feb 2018 00:14
Last Modified:15 Nov 2021 20:24

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