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The unusual multiwavelength properties of the gamma-ray source PMNJ1603−4904

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The unusual multiwavelength properties of the gamma-ray source PMNJ1603−4904

dc.contributor.author	Müller, C.
dc.contributor.author	Kadler, Matthias
dc.contributor.author	Ojha, R.
dc.contributor.author	Böck, M.
dc.contributor.author	Krauss, F.
dc.contributor.author	Taylor, G.B.
dc.contributor.author	Wilms, J.
dc.contributor.author	Blanchard, J.
dc.contributor.author	Carpenter, B.
dc.contributor.author	Edwards, P.G.
dc.contributor.author	Dauser, T.
dc.contributor.author	Dutka, M.
dc.contributor.author	Gehrels, N.
dc.contributor.author	Grossberger, C.
dc.contributor.author	Hase, H.
dc.contributor.author	Horiuchi, S.
dc.contributor.author	Kreikenbohm, A.
dc.contributor.author	Lovell, J.E.J.
dc.contributor.author	McConville, W.
dc.contributor.author	Phillips, C.
dc.contributor.author	Plötz, C.
dc.contributor.author	Pursimo, T.
dc.contributor.author	Quick, J.
dc.contributor.author	Ros Ibarra, Eduardo
dc.contributor.author	Schulz, R.
dc.contributor.author	Stevens, J.
dc.contributor.author	Tingay, S. J.
dc.contributor.author	Trüstedt, J.
dc.contributor.author	Tzioumis, A.K.
dc.contributor.author	Zensus, J. Anton
dc.date.accessioned	2017-07-06T14:15:25Z
dc.date.available	2017-07-06T14:15:25Z
dc.date.issued	2014
dc.identifier.citation	Müller, C. Kadler, Matthias Ojha, R. Böck, M. Krauss, F. Taylor, G.B. Wilms, J. Blanchard, J. Carpenter, B. Edwards, P.G. Dauser, T. Dutka, M. Gehrels, N. Grossberger, C. Hase, H. Horiuchi, S. Kreikenbohm, A. Lovell, J.E.J. McConville, W. Phillips, C. Plötz, C. Pursimo, T. Quick, J. Ros Ibarra, Eduardo Schulz, R. Stevens, J. Tingay, S. J. Trüstedt, J. Tzioumis, A.K. Zensus, J. Anton 2014 The unusual multiwavelength properties of the gamma-ray source PMNJ1603−4904 Astronomy and Astrophysics 562 A4 1 11
dc.identifier.uri	http://hdl.handle.net/10550/59370
dc.description.abstract	Context. We investigate the nature and classification of PMNJ1603−4904, a bright radio source close to the Galactic plane, which is associated with one of the brightest hard-spectrum gamma-ray sources detected by Fermi/LAT. It has previously been classified as a low-peaked BL Lac object based on its broadband emission and the absence of optical emission lines. Optical measurements, however, suffer strongly from extinction and the absence of pronounced short-time ga,,a-ray variability over years of monitoring is unusual for a blazar. Aims. In this paper, we are combining new and archival multiwavelength data of PMNJ1603−4904 in order to reconsider the classification and nature of this unusual gamma-ray source. Methods. For the first time, we study the radio morphology of PMNJ1603−4904 at 8.4GHz and 22.3GHz, and its spectral properties on milliarcsecond scales, based on VLBI observations from the TANAMI program. We combine the resulting images with multiwavelength data in the radio, IR, optical/UV, X-ray, and gamma-ray regimes. Results. PMNJ1603−4904 shows a symmetric brightness distribution at 8.4GHz on milliarcsecond scales, with the brightest, and most compact component in the center of the emission region. The morphology is reminiscent of a Compact Symmetric Object (CSO). Such objects, thought to be young radio galaxies, have been predicted to produce gamma-ray emission but have not been detected as a class by the Fermi gamma-ray telescope so far. Sparse (u,v)-coverage at 22.3GHz prevents an unambiguous modeling of the source morphology at this higher frequency. Moreover, infrared measurements reveal an excess in the spectral energy distribution (SED), which can be modeled with a blackbody with a temperature of about 1600K, and which is usually not present in blazar SEDs. Conclusions. The TANAMI VLBI data and the shape of the broadband SED challenge the current blazar classification of one of the brightest gamma-ray sources in the sky. PMNJ1603−4904 seems to be either a highly peculiar BL Lac object or a misaligned jet source. In the latter case, the intriguing VLBI structure opens room for a possible classification of PMNJ1603−4904 as a gamma-ray bright CSO.
dc.language.iso	eng
dc.relation.ispartof	Astronomy and Astrophysics, 2014, vol. 562, num. A4, p. 1-11
dc.subject	Astrofísica
dc.subject	Astronomia
dc.title	The unusual multiwavelength properties of the gamma-ray source PMNJ1603−4904
dc.type	journal article	es_ES
dc.date.updated	2017-07-06T14:15:25Z
dc.identifier.doi	10.1051/0004-6361/201322827
dc.identifier.idgrec	092412
dc.rights.accessRights	open access	es_ES