The gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447

Simple item page
dc.contributor.authorSchulz, R.
dc.contributor.authorKreikenbohm, A.
dc.contributor.authorKadler, M.
dc.contributor.authorOjha, R.
dc.contributor.authorRos, E.
dc.contributor.authorStevens, J.
dc.contributor.authorEdwards, P. G.
dc.contributor.authorCarpenter, B.
dc.contributor.authorElsässer, D.
dc.contributor.authorGehrels, N.
dc.contributor.authorGrossberger, C.
dc.contributor.authorHase, H.
dc.contributor.authorHoriuchi, S.
dc.contributor.authorLovell, J. E. J.
dc.contributor.authorMannheim, K.
dc.contributor.authorMarkowitz, A.
dc.contributor.authorMüller, C.
dc.contributor.authorPhillips, C.
dc.contributor.authorPlötz, C.
dc.contributor.authorQuick, J.
dc.contributor.authorTrüstedt, J.
dc.contributor.authorTzioumis, A. K.
dc.contributor.authorWilms, J.
dc.date.accessioned2020-05-04T15:18:50Z
dc.date.available2020-05-04T15:18:50Z
dc.date.issued2016-04-01
dc.description.abstractContext. Γ-ray-detected radio-loud narrow-line Seyfert 1 (γ-NLS1) galaxies constitute a small but interesting sample of the γ-ray-loud AGN. The radio-loudest γ-NLS1 known, PKS 2004−447, is located in the southern hemisphere and is monitored in the radio regime by the multiwavelength monitoring programme TANAMI. Aims. We aim for the first detailed study of the radio morphology and long-term radio spectral evolution of PKS 2004−447, which are essential for understanding the diversity of the radio properties of γ-NLS1s. Methods. The TANAMI VLBI monitoring program uses the Australian Long Baseline Array (LBA) and telescopes in Antarctica, Chile, New Zealand, and South Africa to monitor the jets of radio-loud active galaxies in the southern hemisphere. Lower resolution radio flux density measurements at multiple radio frequencies over four years of observations were obtained with the Australia Telescope Compact Array (ATCA). Results. The TANAMI VLBI image at 8.4 GHz shows an extended one-sided jet with a dominant compact VLBI core. Its brightness temperature is consistent with equipartition, but it is an order of magnitude below other γ-NLS1s with the sample value varying over two orders of magnitude. We find a compact morphology with a projected large-scale size < 11 kpc and a persistent steep radio spectrum with moderate flux-density variability. Conclusions. PKS 2004−447 appears to be a unique member of the γ-NLS1 sample. It exhibits blazar-like features, such as a flat featureless X-ray spectrum and a core-dominated, one-sided parsec-scale jet with indications for relativistic beaming. However, the data also reveal properties atypical for blazars, such as a radio spectrum and large-scale size consistent with compact-steep-spectrum (CSS) objects, which are usually associated with young radio sources. These characteristics are unique among all γ-NLS1s and extremely rare among γ-ray-loud AGN.en_US
dc.description.sponsorshipWe thank the MPIfR internal referee S. Komossa and the anonymous journal referee for their insightful comments, which improved the manuscript in its final form. This work was funded by DeutscheForschungsgemeinschaft grant WI 1860/10-1. We acknowledge support by the Deutsches Zentrum für Luft- und Raumfahrt under contract number 50 OR 1303, by the Spanish MINECO projects AYA2009-13036-C02-02 and AYA2012-38491-C02-01, and by the Generalitat Valenciana projects PROMETEO/2009/104 and PROMETEO/II/2014/057, as well as by the MP0905 action “Black Holes in a Violent Universe”. This research was funded in part by NASA through Fermi Guest Investigator grants NNH09ZDA001N, NNH10ZDA001N, NNH12ZDA001N, and NNH13ZDA001N-FERMI (proposal numbers 31263, 41213, 61089, and 71326, respectively). This research was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Oak Ridge Associated Universities through a contract with NASA. The Australian Long Baseline Array and the Australia Telescope Compact Array are part of the Australia Telescope National Facility, which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. This research made use of the Interactive Spectral Interpretation System (ISIS) (Houck & Denicola 2000). This research made use of a collection of ISIS scripts provided by the Dr. Karl Remeis observatory, Bamberg, Germany at http://www.sternwarte.uni-erlangen.de/isis/. This research made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research made use of the VizieR catalogue access tool, CDS, Strasbourg, France. This research made use of data from the MOJAVE database that is maintained by the MOJAVE team (Lister et al. 2009).en_US
dc.description.urihttps://www.aanda.org/articles/aa/abs/2016/04/aa27404-15/aa27404-15.htmlen_US
dc.format.extent10 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2zxm1-lezm
dc.identifier.citationThe gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447 - II. The radio view R. Schulz, A. Kreikenbohm, M. Kadler, R. Ojha, E. Ros, J. Stevens, P. G. Edwards, B. Carpenter, D. Elsässer, N. Gehrels, C. Großberger, H. Hase, S. Horiuchi, J. E. J. Lovell, K. Mannheim, A. Markowitz, C. Müller, C. Phillips, C. Plötz, J. Quick, J. Trüstedt, A. K. Tzioumis and J. Wilms A&A, 588 (2016) A146 DOI: https://doi.org/10.1051/0004-6361/201527404en_US
dc.identifier.urihttps://doi.org/10.1051/0004-6361/201527404
dc.identifier.urihttp://hdl.handle.net/11603/18478
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2016A%26A...588A.146S
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2016A%26A...588A.146S
dc.identifier.urihttp://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/A+A/588/A146
dc.language.isoen_USen_US
dc.publisherEDP sciencesen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleThe gamma-ray emitting radio-loud narrow-line Seyfert 1 galaxy PKS 2004−447en_US
dc.typeTexten_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
aa27404-15.pdf
Size:
327.76 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
2.56 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

UMBC Physics Department
UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection