Restarting activity in the nucleus of PBC J2333.9-2343: An extreme case of jet realignment
L. Hernández-García,Francesca Panessa,Marcello Giroletti,Gabriele Ghisellini,L. Bassani,N. Masetti,N. Masetti,Mirjana Pović,Angela Bazzano,Pietro Ubertini,Angela Malizia,V. H. Chavushyan +11 more
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In this article, the spectral energy distribution (SED) of the radio galaxy PBC J2333.9-2343 was analyzed using simultaneous multi-wavelength data from the Very Long Baseline Array (VLBA), the San Pedro Martir telescope, and the XMM-Newton observatories.Abstract:
Context. The giant radio galaxy PBC J2333.9-2343 shows different characteristics at different wavebands that are difficult to explain within the actual generic schemes of unification of active galactic nuclei (AGN). It is therefore a good candidate host for different phases of nuclear activity. Aims. We aim at disentangling the nature of this AGN by using simultaneous multiwavelength data. Methods. We obtained data in 2015 from the Very Long Baseline Array (VLBA), the San Pedro Martir telescope, and the XMM-Newton observatories. This allows the study of the nuclear parts of the galaxy through its morphology and spectra and the analysis of the spectral energy distribution (SED). We also reanalysed previously-presented optical data from the San Pedro Martir telescope from 2009 to provide a homogeneous comparison. Results. At X-ray frequencies the source is unabsorbed. The optical spectra are of a type 1.9 AGN, both in 2009 and 2015, although showing a broader component in 2015. The VLBA radio images show an inverted spectrum with a self-absorbed, optically thick compact core ( α c = 0.40, where S ν ∝ ν + α ) and a steep-spectrum, optically thin jet ( α j,8−15 = −0.5). The SED resembles that of typical blazars and is best represented by an external Compton (EC) model with a viewing angle of approximately 3–6°. The apparent size of the large-scale structure of PBC J2333.9-2343 must correspond to an intrinsic deprojected value of approximately 7 Mpc for θ v 13 Mpc for θ v Conclusions. The above arguments suggest that PBC J2333.9-2343 has undergone a new episode of nuclear activity and that the direction of the new jet has changed in the plane of the sky and is now pointing towards us. This changes this source from a radio galaxy to a blazar, a very exceptional case of restarting activity.read more
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The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
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TL;DR: The 4LAC catalog of active galactic nuclei (AGNs) detected by the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) between 2008 August 4 and 2016 August 2 contains 2863 objects located at high Galactic latitudes (|b|>10°deg}).
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The life cycle of radio galaxies in the LOFAR Lockman Hole field
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TL;DR: In this paper, the authors used deep LOFAR images at 150 MHz of the Lockman Hole extragalactic field to select a sample of 158 radio sources with sizes > 60″ in different phases of their jet life cycle.
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Hard X-ray-selected giant radio galaxies - I. The X-ray properties and radio connection
Francesco Ursini,Loredana Bassani,Francesca Panessa,A. J. Bird,Gabriele Bruni,Mariateresa Fiocchi,Angela Malizia,L. Saripalli,P. Ubertini +8 more
TL;DR: In this paper, a broad-band X-ray study of the nuclei of 14 hard-X-ray-selected giant radio galaxies is presented, based both on the literature and on the analysis of archival X-Ray data from NuSTAR, XMM-Newton, Swift, and INTEGRAL.
Journal ArticleDOI
A Discovery of Young Radio Sources in the Cores of Giant Radio Galaxies Selected at Hard X-Rays
Gabriele Bruni,Francesca Panessa,L. Bassani,E. Chiaraluce,E. Chiaraluce,Alex Kraus,Daniele Dallacasa,Daniele Dallacasa,Angela Bazzano,L. Hernández-García,Angela Malizia,Pietro Ubertini,Francesco Ursini,Tiziana Venturi +13 more
TL;DR: In this article, radio observations of 15 nuclei of hard X-ray selected GRG, finding for the first time a large fraction (61%) of young radio sources at the center of Mpc-scale structures.
Journal ArticleDOI
Hard X-ray selected giant radio galaxies - II. Morphological evidence of restarted radio activity
Gabriele Bruni,Francesca Panessa,Loredana Bassani,Daniele Dallacasa,Daniele Dallacasa,Tiziana Venturi,L. Saripalli,M. Brienza,M. Brienza,L. Hernández-García,E. Chiaraluce,Francesco Ursini,Angela Bazzano,Angela Malizia,P. Ubertini +14 more
TL;DR: In this article, the authors presented a radio morphological study of a sample of 15 hard X-ray selected GRG, discussing low-frequency images from our GMRT campaign complemented with others from the literature: among them, 7/15 show evidence of restarted radio activity either in the form of double-double/X-shaped morphology, or as a cocoon emission embedding more recent jets.
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