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Probing restarting activity in hard X-ray selected giant radio galaxies

Published online by Cambridge University Press:  03 March 2020

G. Bruni ,
F. Ursini ,
F. Panessa ,
L. Bassani ,
A. Bazzano ,
A. J. Bird ,
E. Chiaraluce ,
D. Dallacasa ,
M. Fiocchi  and
M. Giroletti
...Show all authors
G. Bruni
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali via del Fosso del Cavaliere 100, 00133Roma, Italy email: gabriele.bruni@inaf.it
F. Ursini
Affiliation:
INAF - Osservatorio di Astrofisica e Scienza dello Spazio via Piero Gobetti 93/3, 40129Bologna, Italy email: francesco.ursini@inaf.it
F. Panessa
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali via del Fosso del Cavaliere 100, 00133Roma, Italy email: gabriele.bruni@inaf.it
L. Bassani
Affiliation:
INAF - Osservatorio di Astrofisica e Scienza dello Spazio via Piero Gobetti 93/3, 40129Bologna, Italy email: francesco.ursini@inaf.it
A. Bazzano
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali via del Fosso del Cavaliere 100, 00133Roma, Italy email: gabriele.bruni@inaf.it
A. J. Bird
Affiliation:
School of Physics and Astronomy, University of Southampton, SO17 1BJ, UK
E. Chiaraluce
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali via del Fosso del Cavaliere 100, 00133Roma, Italy email: gabriele.bruni@inaf.it
D. Dallacasa
Affiliation:
DIFA - Dipartimento di Fisica e Astronomia Università di Bologna, via Gobetti 93/2, 40129Bologna, Italy INAF - Istituto di Radioastronomia, via Piero Gobetti 101, 40129Bologna, Italy
M. Fiocchi
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali via del Fosso del Cavaliere 100, 00133Roma, Italy email: gabriele.bruni@inaf.it
M. Giroletti
Affiliation:
INAF - Istituto di Radioastronomia, via Piero Gobetti 101, 40129Bologna, Italy
L. Hernández-García
Affiliation:
IFA - Instituto de Física y Astronomía Universidad de Valparaíso, Gran Bretaña 1111, Playa Ancha, Valparaíso, Chile
A. Malizia
Affiliation:
INAF - Osservatorio di Astrofisica e Scienza dello Spazio via Piero Gobetti 93/3, 40129Bologna, Italy email: francesco.ursini@inaf.it
M. Molina
Affiliation:
INAF - Osservatorio di Astrofisica e Scienza dello Spazio via Piero Gobetti 93/3, 40129Bologna, Italy email: francesco.ursini@inaf.it
L. Saripalli
Affiliation:
Raman Research Institute, C. V. Raman Avenue, Sadashivanagar, Bangalore560080, India
P. Ubertini
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali via del Fosso del Cavaliere 100, 00133Roma, Italy email: gabriele.bruni@inaf.it
T. Venturi
Affiliation:
INAF - Istituto di Radioastronomia, via Piero Gobetti 101, 40129Bologna, Italy
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Abstract

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With their sizes larger than 0.7 Mpc, Giant Radio Galaxies (GRGs) are the largest individual objects in the Universe. To date, the reason why they reach such enormous extensions is still unclear. One of the proposed scenarios suggests that they are the result of multiple episodes of jet activity. Cross-correlating the INTEGRAL+Swift AGN population with radio catalogues (NVSS, FIRST, SUMSS), we found that 22% of the sources are GRG (a factor four higher than those selected from radio catalogues). Remarkably, all of the sources in the sample show signs of restarting radio activity. The X-ray properties are consistent with this scenario, the sources being in a high-accretion, high-luminosity state with respect to the previous activity responsible for the radio lobes.

Keywords

galaxies: activegalaxies: evolutiongalaxies: jetsradio continuum: galaxiesX-rays: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium A30: Astronomy in Focus XXX , August 2018 , pp. 66 - 69
Copyright
© International Astronomical Union 2020

Footnotes

†

website: http://gral.iaps.inaf.it

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