The infrared-dominated jet of 3C401

Show simple item record Chiaberge, Marco en_US Sparks, William en_US Macchetto, Duccio en_US Perlman, Eric en_US Capetti, Alessandro en_US Balmaverde, Barbara en_US Floyd, David en_US O'Dea, Christopher en_US Axon, David en_US 2006-05-09T19:43:45Z en_US 2006-05-09T19:43:45Z en_US 2005-08-10 en_US
dc.identifier.citation Astrophysical Journal 629N1 (2005) 100-107 en_US
dc.identifier.issn 1538-4357 en_US
dc.identifier.uri en_US
dc.description Also archived in: arXiv:astro-ph/0505034 v2 16 May 2005 en_US
dc.description.abstract We present a Hubble Space Telescope image of the FR II radio galaxy 3C 401, obtained at 1.6µm with the NICMOS camera in which we identify the infrared counterpart of the brightest region of the radio jet. The jet has a complex radio structure and brightens where bending occurs, most likely as a result of relativistic beaming. We analyze archival data in the radio, optical and X-ray bands and we derive its spectral energy distribution. Differently from all of the previously known optical extragalactic jets, the jet in 3C 401 is not detected in the X-rays even in a long 48ksec X-ray Chandra exposure and the infrared emission dominates the overall SED. We propose that the dominant radiation mechanism of this jet is synchrotron. The low X-ray emission is then caused by two different effects: i) the lack of any strong external photon field and ii) the shape of the electron distribution. This affects the location of the synchrotron peak in the SED, resulting in a sharp cut-off at energies lower than the X-rays. Thus 3C 401 shows a new type of jet which has intermediate spectral properties between those of FR I, which are dominated by synchrotron emission up to X-ray energies and FR II/QSO, which show a strong high-energy emission due to inverse-Compton scattering of external photons. This might be a clue for the presence of a continuous “sequence” in the properties of large scale jets, in analogy with the “blazar sequence” already proposed for sub-pc scale jets. en_US
dc.description.sponsorship This paper is based on observations obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS 5-26555. en_US
dc.format.extent 394393 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher Astrophysical Journal en_US
dc.relation.ispartofseries vol. 629 en_US
dc.relation.ispartofseries no. 1 en_US
dc.relation.ispartofseries part 1 en_US
dc.relation.ispartofseries pps. 100-107 en_US
dc.subject Galaxies-active en_US
dc.subject Galaxies-individual (3C401) en_US
dc.subject Galaxies-jets en_US
dc.title The infrared-dominated jet of 3C401 en_US
dc.type Article en_US

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