C.D.S. - SIMBAD4 rel 1.7 - 2020.09.29CEST21:53:17

2013A&A...551A.139T - Astronomy and Astrophysics, volume 551A, 139-139 (2013/3-1)

3.3 µm PAH observations of the central kiloparsecs of Centaurus A.


Abstract (from CDS):

The aim of this work is to further investigate the nature of polycyclic aromatic hydrocarbon (PAH) excitation and emission especially in the context of tracing star formation in a variety of extragalactic environments. Here we turn our attention to the energetic environment of the closest active galactic nucleus (AGN) in our sample, Centaurus A. Using ISAAC on the ESO VLT UT1 (Antu) we have made high spatial resolution 3.3µm imaging observations of the central kiloparsec of CenA. These observations have been compared with star formation tracers in the near- and mid-infrared, as well as with mid-infrared tracers of nuclear activity. The nucleus is not devoid of PAH emission, implying that the PAH particles are not destroyed in the nucleus as might be expected for such a harsh environment. However, we see the feature to continuum ratio decrease towards the AGN. As well, the 3.3µm PAH feature emission generally traces the sites of star formation in CenA, but in detail there are spatial offsets, consistent with an earlier study of the starburst galaxies NGC253 and NGC1808. However, the feature-to-continuum ratio does not drop at the positions of star formation as was previously seen in that earlier study. The cause for this difference remains uncertain. Finally, our data reveal possible evidence for a nearly face-on, circular or spiral, dust structure surrounding the nucleus.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: Centaurus A (NGC 5128) - galaxies: ISM - galaxies: Seyfert

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2950 2
2 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4113 2
3 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 655 3
4 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4022 3
5 NAME Cen A Shell reg ~ ~           ~ 5 1

    Equat.    Gal    SGal    Ecl

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