Search and analysis of giant radio galaxies with associated nuclei (SAGAN)

Mahato, Mousumi; Dabhade, Pratik; Saikia, D. J.; Combes, F.; Ho, Luis C.; Raychaudhury, Somak

doi:10.1051/0004-6361/202141928

Cited by 11 publications

(8 citation statements)

References 104 publications

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“…We stress that, while recent observational efforts are significantly increasing the detection number of giant radio galaxies and giant radio quasars (GRQs) (e.g. Kuźmicz et al 2018;Dabhade et al 2020a,b;Bruni et al 2020;Kuźmicz & Jamrozy 2021;Delhaize et al 2021;Andernach et al 2021;Simonte et al 2022;Mahato et al 2022, Oei et al 2022, the number of giant radio sources identified at redshift z > 1.5 remains to date limited (10/239 in the sample of Dabhade et al 2020b;33/272 The total flux density of J103025+052430 at 144 MHz and 1400 MHz, as well as the flux densities of the individual morphological components, are listed in Table 2, together with the respective luminosities. These were measured from the 6-arcsec resolution maps at both frequencies for consistency and using the black regions shown in Fig.…”

Section: Radio Source Propertiesmentioning

confidence: 94%

AGN feedback in an infant galaxy cluster: the LOFAR-Chandra view of the giant FRII radio galaxy J103025+052430 at z=1.7

Brienza¹,

Prandoni²,

D'Amato³

et al. 2023

Preprint

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In the nearby universe jets from Active Galactic Nuclei (AGN) are observed to have a dramatic impact on their surrounding extragalactic environment. The effect of jets at high redshift (z>1.5) is instead much less constrained. However, studying their impact at the 'cosmic noon', the epoch when both star formation and AGN activity peak, is crucial to fully understand galaxy evolution.Here we present a study of the giant (∼750 kpc) radio galaxy 103025+052430 located at the centre of a protocluster at redshift z=1.7, with a focus on its interaction with the external medium. We present new LOFAR observations at 144 MHz, which we combine with VLA 1.4 GHz data and 0.5-7 keV Chandra archival data. The new radio map at 144 MHz confirms that the source has a complex morphology, which can possibly fit the 'hybrid morphology' radio galaxy classification. The large size of the source gave us the possibility to perform a resolved radio spectral index analysis, a very unique opportunity for a source at such high redshift. This reveals a tentative, unexpected, flattening of the radio spectral index at the edge of the backflow in the Western lobe, which might be indicating plasma compression. The spatial coincidence between this region and the thermal X-ray bubble C, suggests a causal connection between the two. Contrary to previous estimates for the bright X-ray component A, we find that inverse Compton scattering between the radio-emitting plasma of the Eastern lobe and the CMB photons can account for a large fraction (∼ 45%-80%) of its total 0.5-7 keV measured flux. Finally, the X-ray bubble C, which is consistent with a thermal origin, is found to be significantly overpressurised with respect to the ambient medium. This suggests that it will tend to expand and release its energy in the surroundings, contributing to the overall intracluster medium heating. Overall, 103025+052430 gives us the chance to investigate the interaction between AGN jets and the surrounding medium in a system that is likely the predecessor of the rich galaxy clusters we all well know at z=0.

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Section: Radio Source Propertiesmentioning

confidence: 94%

AGN feedback in an infant galaxy cluster: the LOFAR-Chandra view of the giant FRII radio galaxy J103025+052430 at z=1.7

Brienza¹,

Prandoni²,

D'Amato³

et al. 2023

Preprint

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“…Recent research (Dabhade et al 2017(Dabhade et al , 2020bUrsini et al 2018;Bhukta et al 2022c) has accepted 0.7 Mpc as the lowest linear size limit of GRSs with the updated H 0 value obtained from observations. The total number of GRSs known to date is comparatively small with respect to RSs, despite the fact that their number has significantly expanded during the past 7 yr (Dabhade et al 2017;Kuźmicz et al 2018;Dabhade et al 2020aDabhade et al , 2020bDabhade et al , 2020cKuźmicz & Jamrozy 2021;Andernach et al 2021;Mahato et al 2022;Simonte et al 2022;Dabhade et al 2023). The longest known GRG to date is J081421.68+522410.0 in the LOw-Frequency ARray (LOFAR) Two-meter Sky Survey (LoTSS) Data Release 2 (DR2) field at 144 MHz, which extends 4.69 Mpc (Oei et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Discovery of Giant Radio Sources from TGSS Alternative Data Release 1: Radio, Optical, and Infrared Properties

Bhukta,

Manik,

Pal

et al. 2024

ApJS

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Giant radio sources (GRSs) are the single largest astrophysical objects known in the Universe that have grown to megaparsec scales (≥0.7 Mpc). GRSs are much rarer compared with normal-sized radio galaxies. Still, the reason for the formation of their gigantic sizes is under debate. We systematically search for GRSs from the TIFR Giant Metrewave Radio Telescope Sky Survey Alternative Data Release 1 at 150 MHz. We have newly identified 34 GRSs from this study. We have also studied the multiwavelength properties (radio, optical, and infrared) of these GRSs. We have used the likelihood ratio method to identify highly reliable multiwavelength counterparts of GRSs from Pan-STARRS (optical) and Wide-field Infrared Survey Explorer (mid-IR) data. We have classified GRSs based on their accretion mode of the central black holes using optical and mid-IR data. For all sources, we also discuss the principal characteristic parameters (redshift distribution, angular and projected linear size, total integrated radio flux density, spectral index, and radio power). We show the radio evolution track and the location of the GRSs in the P–D diagram. Using a radio–optical luminosity diagram, we identify GRSs in the Fanaroff–Riley classification. Only two GRGs in our sample reside close to the centers of galaxy clusters.

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“…Giant radio galaxies (GRGs) are radio galaxies that have linear extents of more than 700 kpc or 1 Mpc, depending on definition (Willis et al 1974;Schoenmakers et al 2000a;Kuźmicz & Jamrozy 2012;Kuźmicz et al 2018). The total number of GRGs known to date is relatively small, even though over the past 20 years their number has increased substantially (Ishwara-Chandra & Saikia 1999;Schoenmakers et al 2000a;Lara et al 2000;Machalski et al 2001;Saripalli et al 2005;Machalski et al 2006;Jamrozy et al 2008;Kuźmicz & Jamrozy 2012;Dabhade et al 2017;Kuźmicz et al 2018;Dabhade et al 2020a,b,c;Kuźmicz & Jamrozy 2021;Andernach et al 2021;Mahato et al 2022). Their origin and the cause for their huge sizes are still not understood.…”

Section: Introductionmentioning

confidence: 99%

Giant radio galaxies in the LOw-Frequency ARray Two-metre Sky Survey Boötes deep field

Simonte

Andernach

Brüggen

et al. 2022

Monthly Notices of the Royal Astronomical Society

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Giant radio galaxies (GRGs) are radio galaxies that have projected linear extents of more than 700 kpc or 1 Mpc, depending on definition. We have carried out a careful visual inspection in search of GRGs of the Boötes LOFAR Deep Field (BLDF) image at 150 MHz. We identified 74 GRGs with a projected size larger than 0.7 Mpc of which 38 are larger than 1 Mpc. The resulting GRG sky density is about 2.8 (1.43) GRGs per square degree for GRGs with linear size larger than 0.7 (1) Mpc. We studied their radio properties and the accretion state of the host galaxies using deep optical and infrared survey data and determined flux densities for these GRGs from available survey images at both 54 MHz and 1.4 GHz to obtain integrated radio spectral indices. We show the location of the GRGs in the P-D diagram. The accretion mode on to the central black holes of the GRG hosts is radiatively inefficient suggesting that the central engines are not undergoing massive accretion at the time of the emission. Interestingly, 14 out of 35 GRGs for which optical spectra are available show a moderate star formation rate (10-100 $\rm M_{\odot }~yr^{-1}$). Based on the number density of optical galaxies taken from the DESI DR9 photometric redshift catalogue, we found no significant differences between the environments of GRGs and other radio galaxies, at least for redshift up to z = 0.7.

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Search and analysis of giant radio galaxies with associated nuclei (SAGAN)

Cited by 11 publications

References 104 publications

AGN feedback in an infant galaxy cluster: the LOFAR-Chandra view of the giant FRII radio galaxy J103025+052430 at z=1.7

AGN feedback in an infant galaxy cluster: the LOFAR-Chandra view of the giant FRII radio galaxy J103025+052430 at z=1.7

Discovery of Giant Radio Sources from TGSS Alternative Data Release 1: Radio, Optical, and Infrared Properties

Giant radio galaxies in the LOw-Frequency ARray Two-metre Sky Survey Boötes deep field

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