A redshifted Fe K$\alpha$ line from the unusual gamma-ray source PMN J1603-4904

Abstract

Multiwavelength observations have revealed the highly unusual properties of the gamma-ray source PMN J1603-4904, which are difficult to reconcile with any other well established gamma-ray source class. The object is either a very atypical blazar or compact jet source seen at a larger angle to the line of sight. In order to determine the physical origin of the high-energy emission processes in PMN J1603-4904, we study the X-ray spectrum in detail. We performed quasi-simultaneous X-ray observations with XMM-Newton and Suzaku in 2013 September, resulting in the first high signal-to-noise X-ray spectrum of this source. The 2-10 keV X-ray spectrum can be well described by an absorbed power law with an emission line at 5.44$\pm$0.05 keV (observed frame). Interpreting this feature as a Kα line from neutral iron, we determine the redshift of PMN J1603-4904 to be z=0.18$\pm$0.01, corresponding to a luminosity distance of 872$\pm$54 Mpc. The detection of a redshifted X-ray emission line further challenges the original BL Lac classification of PMN J1603-4904. This result suggests that the source is observed at a larger angle to the line of sight than expected for blazars, and thus the source would add to the elusive class of gamma-ray loud misaligned-jet objects, possibly a γ-ray bright young radio galaxy.

arXiv comment5 pages, 1 figure, A&A accepted

References in corpus (46)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• On the Absorption of X-rays in the Interstellar Medium
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• The Swift X-ray Telescope
• The European Photon Imaging Camera on XMM-Newton: The MOS Cameras
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• Fermi Large Area Telescope Second Source Catalog
• A Unifying View of the Spectral Energy Distributions of Blazars
• The Second Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
• A rapidly spinning supermassive black hole at the centre of NGC 1365
• Hard X-ray properties of blazars
• Spectroscopy of The Largest Ever Gamma-ray Selected BL Lac Sample
• The First Fermi-LAT Catalog of Sources Above 10 GeV
• An X-ray Spectral Survey of Radio-Loud AGN With ASCA
• The X-ray nuclei of intermediate-redshift radio sources
• Chandra and XMM-Newton Observations of a Sample of Low-Redshift FRI and FRII Radio-Galaxy Nuclei
• Fermi Large Area Telescope Observations of Misaligned AGN
• The Cores of the Fe K$\alpha$ Lines in Active Galactic Nuclei: an Extended Chandra High Energy Grating Sample
• ASCA Observations of Blazars and Multiband Analysis
• The multiwavelength variability of 3C 273
• FERO: Finding Extreme Relativistic Objects. I. Statistics of Relativistic Fe Kalpha lines in Radio-Quiet Type 1 AGN
• On the Evolution of and High-Energy Emission from GHz-Peaked-Spectrum Sources
• TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry I. First-Epoch 8.4 GHz Images
• The broad band spectral variability of MCG-6-30-15 observed by NuSTAR and XMM-Newton
• On the origin of the Fe K-alpha line cores in Active Galactic Nuclei
• Simultaneous NuSTAR and XMM-Newton 0.5-80 keV spectroscopy of the Narrow Line Seyfert 1 galaxy SWIFT J2127.4+5654
• X-ray reprocessing in Seyfert Galaxies: simultaneous XMM-Newton/BeppoSAX observations
• BeppoSAX view of radio-loud Active Galactic Nuclei
• Hard X-Ray Spectra of Broad-Line Radio Galaxies from the Rossi X-Ray Timing Explorer
• X-ray Properties of the GigaHertz-Peaked and Compact Steep Spectrum Sources
• The X-ray view of Giga-Hertz Peaked Spectrum Radio Galaxies
• The Suzaku Observation of the Nucleus of the Radio-Loud Active Galaxy Centaurus A: Constraints on Abundances of the Accreting Material
• The hard X-ray view of Giga-Hertz Peaked Spectrum Radio Galaxies
• The X-ray properties of young radio-loud AGN
• X-ray Emitting GHz-Peaked Spectrum Galaxies: Testing a Dynamical-Radiative Model with Broad-Band Spectra
• Full Spectral Survey of Active Galactic Nuclei in the Rossi X-ray Timing Explorer Archive
• Fermi Large Area Telescope Observations of the Active Galaxy 4C +55.17: Steady, Hard Gamma-Ray Emission and its Implications
• The narrow Fe K$\alpha$ line and the molecular torus in active galactic nuclei - an IR/X-ray view
• Jet Emission in Young Radio Sources: a Fermi-LAT Gamma-ray View
• The unusual multiwavelength properties of the gamma-ray source PMNJ1603-4904
• Suzaku Observations of gamma-Ray Bright Radio Galaxies: Origin of the X-ray Emission and Broad-Band Modelin
• First X-ray observations of Low-Power Compact Steep Spectrum Sources
• A Novel Approach in Constraining Electron Spectra in Blazar Jets: The Case of Markarian 421
• Fermi-LAT and Suzaku Observations of the Radio Galaxy Centaurus B
• X-ray emission from GPS and CSS sources
• New class of Very High Energy gamma-ray emitter: radio-dark mini-shells surrounding AGN jets

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• 2FHL: The Second Catalog of Hard Fermi-LAT Sources
• First detection in gamma-rays of a young radio galaxy: Fermi-LAT observations of the Compact Symmetric Object PKS 1718-649
• X-ray properties of the Youngest Radio Sources and their Environments
• Gamma-ray emission in radio galaxies under the VLBI scope -- I. Parsec-scale kinematics and high-energy properties of $\gamma$-ray detected TANAMI radio galaxies
• Extended X-ray emission in PKS 1718$-$649
• Optical-NIR spectroscopy of the puzzling gamma-ray source 3FGL 1603.9-4903/PMN J1603-4904 with X-shooter
• TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources
• TANAMI - Multiwavelength and Multimessenger Observations of Active Galaxies
• The MHz-peaked radio spectrum of the unusual gamma-ray source PMN J1603-4904
• X-ray Emission of the $\gamma$-ray Loud Young Radio Galaxy NGC 3894
• Highly Variable $\gamma$-Ray Emission of CTD 135 and Implications for its Compact Symmetric Structure
• The Fermi-LAT view of young radio sources
• X-ray and GeV-gamma-ray emission property of TeV Compact Symmetric Object PKS 1413+135 and Implication for Episodic Jet Activity
• Investigating source confusion in PMN J1603$-$4904
• Chandra View of the LINER-type Nucleus in the Radio-Loud Galaxy CGCG 292-057: Ionized Iron Line and Jet-ISM Interactions
• Multiwavelength and parsec-scale properties of extragalactic jets