IGR J17488–2338: a newly discovered giant radio galaxy

Molina, M.; Bassani, L.; Malizia, A.; Bird, A. J.; Bazzano, A.; Ubertini, P.; Venturi, T.

doi:10.1051/0004-6361/201423609

Cited by 19 publications

(19 citation statements)

References 22 publications

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“…• IGR J14488-4008 : we observed this source at 325 MHz and 610 MHz during our GMRT campaign in 2014, which results were partially published (only the 610 MHz image) in Molina et al (2014) Here we report the two flux densities (18.8±1.9 mJy at 325 MHz; 32.3±1.3 mJy at 610 MHz), the first one being extracted from the corresponding map to be presented in a future paper (Bruni et al in prep.). In addition to this, we also report the flux densities at 5 and 8 GHz from the ATPMN southern emisphere survey, carried out with ATCA (McConnell et al 2012).…”

Section: Data From the Literaturementioning

confidence: 78%

A Discovery of Young Radio Sources in the Cores of Giant Radio Galaxies Selected at Hard X-Rays

Bruni

Panessa

Bassani³

et al. 2019

ApJ

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Giant Radio Galaxies (GRG) are the largest single entities in the Universe, having a projected linear size exceeding 0.7 Mpc, which implies that they are also quite old objects. They are not common, representing a fraction of only ∼6% in samples of bright radio galaxies. While a census of about 300 of these objects has been built in the past years, still no light has been shed on the conditions necessary to allow such an exceptional growth, whether of environmental nature or linked to the inner accretion properties. Recent studies found that samples of radio galaxies selected from hard X-ray AGN catalogs selected from INTEGRAL/IBIS and Swift/BAT (thus at energies >20 keV) present a fraction of GRG four times larger than what found in radio-selected samples.We present 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. Being at the center of GRG, these young nuclei may be undergoing a restarting activity episode, suggesting a link between the detected hard X-ray emission -due to the ongoing accretion -and the reactivation of the jets.

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Section: Data From the Literaturementioning

confidence: 78%

A Discovery of Young Radio Sources in the Cores of Giant Radio Galaxies Selected at Hard X-Rays

Bruni

Panessa

Bassani³

et al. 2019

ApJ

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“…identify the second known giant X-shaped radio galaxy (IGR J14488-4008: Molina et al 2015), and a newly discovered GRG (IGR J17488-2338: Molina et al 2014).…”

Section: Hints Of Restarting Activitymentioning

confidence: 96%

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

Bruni¹,

Ursini²,

Panessa³

et al. 2018

Proc. IAU

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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, 80% of the sample shows 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.

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“…The sample of 15 GRG studied in this work. Coordinates of the core from X-ray observations are given (J2000), collected from Baumgartner et al (2013); Malizia et al (2012Malizia et al ( , 2016; Molina et al (2014Molina et al ( , 2015; Parisi et al (2012Parisi et al ( , 2014. In columns 6-9 we mark the evidence of restarted activity for each source.…”

Section: Gmrt Observations and Data Reductionmentioning

confidence: 99%

Hard X-ray selected giant radio galaxies – II. Morphological evidence of restarted radio activity

Bruni

Panessa

Bassani³

et al. 2020

Monthly Notices of the Royal Astronomical Society

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About 6% of Radio Galaxies (RG) can reach linear sizes larger than 0.7 Mpc, and are then classified as Giant Radio Galaxies (GRG). The conditions that make possible the formation of such big structures is still not clear -either core accretion properties or environmental factors. Recent studies have shown that GRG can be up to four times more abundant in hard X-ray selected (i.e. from INTEGRAL/IBIS and Swift/BAT at >20 keV) RG samples. Moreover, a high fraction of young radio sources found in their cores suggests a recently restarted activity, as suggested from the discrepancy between the measured jet and lobes power, with respect to the one expected from core X-ray luminosity. Here we present 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. This, together with the objects from this sample already found hosting a young radio source in their core, suggests that at least 13 over 15 of these hard X-ray selected GRG show features which are consistent with the possibility of restarted radio activity.

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IGR J17488–2338: a newly discovered giant radio galaxy

Cited by 19 publications

References 22 publications

A Discovery of Young Radio Sources in the Cores of Giant Radio Galaxies Selected at Hard X-Rays

A Discovery of Young Radio Sources in the Cores of Giant Radio Galaxies Selected at Hard X-Rays

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

Hard X-ray selected giant radio galaxies – II. Morphological evidence of restarted radio activity

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