Radiative age mapping of the remnant radio galaxy B2 0924+30: the LOFAR perspective

Shulevski, A.; Morganti, Raffaella; Harwood, J. J.; Barthel, P. D.; Jamrozy, M.; Brienza, M.; Brunetti, G.; Röttgering, H. J. A.; Murgia, M.; White, G. J.; Croston, J. H.; Brüggen, M.

doi:10.1051/0004-6361/201630008

Cited by 46 publications

(56 citation statements)

References 47 publications

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“…This is a common problem in the 1 100-1 400 MHz part of the 2.1-GHz band for the ATCA c and has been noted by several authors (e.g. Martinez Aviles et al 2016Aviles et al , 2018Shakouri, Johnston-Hollitt & Pratt 2016). RFI flagging makes use of the MIRIAD task PGFLAG, which utilises the SUMTHRESHOLD method for detecting RFI in the u-v data (Offringa et al 2012).…”

Section: Calibration and Flaggingmentioning

confidence: 96%

The remnant radio galaxy associated with NGC 1534

Duchesne

Johnston‐Hollitt

2019

Publ. Astron. Soc. Aust.

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We present new observations of the large-scale radio emission surrounding the lenticular galaxy NGC 1534 with the Australia Telescope Compact Array and Murchison Widefield Array. We find no significant compact emission from the nucleus of NGC 1534 to suggest an active core, and instead find lowpower radio emission tracing its star-formation history with a radio-derived star-formation rate of 0.38 ± 0.03 M yr −1 . The spectral energy distribution of the extended emission is well-fit by a continuous injection model with an 'off' component, consistent with dead radio galaxies. We find the spectral age of the emission to be 203 Myr, having been active for 44 Myr. Polarimetric analysis points to both a large-scale magneto-ionic Galactic foreground at +33 rad m −2 and a component associated with the northern lobe of the radio emission at −153 rad m −2 . The magnetic field of the northern lobe shows an unusual circular pattern of unknown origin. While such remnant sources are rare, combined low-and high-frequency radio surveys with high surface-brightness sensitivities are expected to greatly increase their numbers in the coming decade, and combined with new optical and infrared surveys should provide a wealth of information on the hosts of the emission.

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Section: Calibration and Flaggingmentioning

confidence: 96%

The remnant radio galaxy associated with NGC 1534

Duchesne

Johnston‐Hollitt

2019

Publ. Astron. Soc. Aust.

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“…in recurring sources (Shulevski et al 2015; see also contribution by Brienza et al in this Volume) or comparatively low-density, low-redshift sources aid, in maintaining M BH -bulge relations (another variation of "maintenance-mode" feedback).…”

Section: Types Of Feedbackmentioning

confidence: 96%

Galaxy‐scale AGN feedback – theory

et al. 2016

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Powerful relativistic jets in radio galaxies are capable of driving strong outflows but also inducing star-formation by pressure-triggering collapse of dense clouds. We review theoretical work on negative and positive active galactic nuclei feedback, discussing insights gained from recent hydrodynamical simulations of jet-driven feedback on galaxy scales that are applicable to compact radio sources. The simulations show that the efficiency of feedback and the relative importance of negative and positive feedback depends strongly on interstellar medium properties, especially the column depth and spatial distribution of clouds. Negative feedback is most effective if clouds are distributed spherically and individual clouds have small column depths, while positive feedback is most effective if clouds are predominantly in a disc-like configuration.

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“…However, this is not always the case (see e.g. B2 0924+30, Cordey 1987;Shulevski et al 2017 andblob1, Brienza et al 2016).…”

Section: Distribution Of Redshiftsmentioning

confidence: 99%

The life cycle of radio galaxies in the LOFAR Lockman Hole field

Jurlin

Morganti

Brienza

et al. 2020

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Radio galaxies are known to go through cycles of activity, where phases of apparent quiescence can be followed by repeated activity of the central supermassive black hole. A better understanding of this cycle is crucial for ascertaining the energetic impact that the jets have on the host galaxy, but little is known about it. We 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. Using a variety of criteria (e.g. core prominence combined with low-surface brightness of the extended emission and steep spectrum of the central region) we selected a subsample of candidate restarted radio galaxies representing between 13% and 15% of the 158 sources of the main sample. We compare their properties to the rest of the sample, which consists of remnant candidates and active radio galaxies. Optical identifications and characterisations of the host galaxies indicate similar properties for candidate restarted, remnant, and active radio galaxies, suggesting that they all come from the same parent population. The fraction of restarted radio galaxies is slightly higher with respect to remnants, suggesting that the restarted phase can often follow after a relatively short remnant phase (the duration of the remnant phase being a few times 107 years). This confirms that the remnant and restarted phases are integral parts of the life cycle of massive elliptical galaxies. A preliminary investigation does not suggest a strong dependence of this cycle on the environment surrounding any given galaxy.

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Radiative age mapping of the remnant radio galaxy B2 0924+30: the LOFAR perspective

Cited by 46 publications

References 47 publications

The remnant radio galaxy associated with NGC 1534

The remnant radio galaxy associated with NGC 1534

Galaxy‐scale AGN feedback – theory

The life cycle of radio galaxies in the LOFAR Lockman Hole field

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