MIGHTEE: are giant radio galaxies more common than we thought?

Delhaize, J.; Heywood, Ian; Prescott, M.; Jarvis, Matt J.; Delvecchio, I.; Whittam, I. H.; White, Sarah V.; Hardcastle, M. J.; Hale, C. L.; Afonso, J.; Ao, Yiping; Brienza, M.; Brüggen, M.; Collier, J. D.; Daddi, Emanuele; Glowacki, Marcin; Maddox, Natasha; Morabito, L. K.; Prandoni, I.; Randriamanakoto, Zara; Sekhar, Srikrishna; An, Fangxia; Adams, Nathan; Blyth, S. L.; Bowler, R. A. A.; Leeuw, L. L.; Marchetti, L.; Randriamampandry, Solohery M.; Thorat, K.; Seymour, N.; Smirnov, O.; Taylor, Andrew; Tasse, C.; Vaccari, M.

doi:10.1093/mnras/staa3837

Cited by 36 publications

(24 citation statements)

References 74 publications

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“…Pasini et al [197] show that radio galaxies larger than 200 kpc are more common in groups than clusters, and the largest radio galaxies are located in groups, probably because the IGrM is less able to confine their growth than the ICM. There is also evidence from new radio surveys, with greater sensitivity to extended diffuse emission, that giant radio galaxies may be more common, in general, than previously believed [201].…”

Section: Giant Radio Galaxiesmentioning

confidence: 89%

“…While its spatial resolution is modest (∼100 ), its high sensitivity at low frequency and provision of fluxes in multiple bands makes it a powerful tool for studying radio galaxies, particularly old, fading sources. Higher frequency (∼1 GHz), higher spatial resolution (8-30 ) surveys of continuum emission and HI are becoming available from ASKAP (e.g., RACS, WALLABY, [357,358]) and MeerKAT (e.g., MIGHTEE, [359]), and these observatories are beginning to produce interesting findings on, e.g., group dynamics and evolution [360,361] and the population of giant radio galaxies [197,201].…”

Section: The Square Kilometer Array and Its Precursorsmentioning

confidence: 99%

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Feedback from Active Galactic Nuclei in Galaxy Groups

et al. 2021

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The co-evolution between supermassive black holes and their environment is most directly traced by the hot atmospheres of dark matter halos. The cooling of the hot atmosphere supplies the central regions with fresh gas, igniting active galactic nuclei (AGN) with long duty cycles. Outflows from the central engine tightly couple with the surrounding gaseous medium and provide the dominant heating source preventing runaway cooling by carving cavities and driving shocks across the medium. The AGN feedback loop is a key feature of all modern galaxy evolution models. Here, we review our knowledge of the AGN feedback process in the specific context of galaxy groups. Galaxy groups are uniquely suited to constrain the mechanisms governing the cooling–heating balance. Unlike in more massive halos, the energy that is supplied by the central AGN to the hot intragroup medium can exceed the gravitational binding energy of halo gas particles. We report on the state-of-the-art in observations of the feedback phenomenon and in theoretical models of the heating-cooling balance in galaxy groups. We also describe how our knowledge of the AGN feedback process impacts galaxy evolution models and large-scale baryon distributions. Finally, we discuss how new instrumentation will answer key open questions on the topic.

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Section: Giant Radio Galaxiesmentioning

confidence: 89%

Section: The Square Kilometer Array and Its Precursorsmentioning

confidence: 99%

Feedback from Active Galactic Nuclei in Galaxy Groups

et al. 2021

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“…Several studies have made use of these data during the development and validation phase (e.g. Pasini et al 2020;Delhaize et al 2021;Delvecchio et al 2021), however a public release of the image and catalogue products that form the Early Science MIGHTEE continuum data now accompanies this article. The properties of the Early Science continuum data meet or exceed the design specifications of the MIGHTEE survey, meaning that the continuum science goals of the full survey can also be met as planned.…”

Section: Discussionmentioning

confidence: 99%

MIGHTEE: total intensity radio continuum imaging and the COSMOS/XMM-LSS Early Science fields

Heywood

Jarvis

Hale

et al. 2021

Monthly Notices of the Royal Astronomical Society

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MIGHTEE is a galaxy evolution survey using simultaneous radio continuum, spectro-polarimetry, and spectral line observations from the South African MeerKAT telescope. When complete, the survey will image ∼20 deg2 over the COSMOS, E-CDFS, ELAIS-S1, and XMM-LSS extragalactic deep fields with a central frequency of 1284 MHz. These were selected based on the extensive multiwavelength datasets from numerous existing and forthcoming observational campaigns. Here we describe and validate the data processing strategy for the total intensity continuum aspect of MIGHTEE, using a single deep pointing in COSMOS (1.6 deg2) and a three-pointing mosaic in XMM-LSS (3.5 deg2). The processing includes the correction of direction-dependent effects, and results in thermal noise levels below 2 $\mathrm{\mu }$Jy beam−1 in both fields, limited in the central regions by classical confusion at ∼8″ angular resolution, and meeting the survey specifications. We also produce images at ∼5″ resolution that are ∼3 times shallower. The resulting image products form the basis of the Early Science continuum data release for MIGHTEE. From these images we extract catalogues containing 9,896 and 20,274 radio components in COSMOS and XMM-LSS respectively. We also process a close-packed mosaic of 14 additional pointings in COSMOS and use these in conjunction with the Early Science pointing to investigate methods for primary beam correction of broadband radio images, an analysis that is of relevance to all full-band MeerKAT continuum observations, and wide field interferometric imaging in general. A public release of the MIGHTEE Early Science continuum data products accompanies this article.

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“…In total, the observations include 17.45 hours on source for the central pointing in the COSMOS field. Details of the observations and data reduction will be presented in I. Heywood et al in preparation but see also a summary in Delhaize et al (2021). Here we provide a brief overview of the final reduced early science data.…”

Section: Mightee 13 Ghz Survey In the Cosmos Fieldmentioning

confidence: 99%

Radio spectral properties of star-forming galaxies in the MIGHTEE-COSMOS field and their impact on the far-infrared-radio correlation

Vaccari

Smail

et al. 2021

Monthly Notices of the Royal Astronomical Society

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We study the radio spectral properties of 2,094 star-forming galaxies (SFGs) by combining our early science data from the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey with VLA, GMRT radio data, and rich ancillary data in the COSMOS field. These SFGs are selected at VLA 3 GHz, and their flux densities from MeerKAT 1.3 GHz and GMRT 325 MHz imaging data are extracted using the ‘super-deblending’ technique. The median radio spectral index is $\alpha _{\rm 1.3\, GHz}^{\rm 3\, GHz}=-0.80\pm 0.01$ without significant variation across the rest-frame frequencies ∼1.3–10 GHz, indicating radio spectra dominated by synchrotron radiation. On average, the radio spectrum at observer-frame 1.3–3 GHz slightly steepens with increasing stellar mass with a linear fitted slope of β = −0.08 ± 0.01, which could be explained by age-related synchrotron losses. Due to the sensitivity of GMRT 325 MHz data, we apply a further flux density cut at 3 GHz (S3 GHz ≥ 50 μJy) and obtain a sample of 166 SFGs with measured flux densities at 325 MHz, 1.3 GHz, and 3 GHz. On average, the radio spectrum of SFGs flattens at low frequency with the median spectral indices of $\alpha ^{\rm 1.3\, GHz}_{\rm 325\, MHz}=-0.59^{+0.02}_{-0.03}$ and $\alpha ^{\rm 3.0\, GHz}_{\rm 1.3\, GHz}=-0.74^{+0.01}_{-0.02}$. At low frequency, our stacking analyses show that the radio spectrum also slightly steepens with increasing stellar mass. By comparing the far-infrared-radio correlations of SFGs based on different radio spectral indices, we find that adopting $\alpha _{\rm 1.3\, GHz}^{\rm 3\, GHz}$ for k-corrections will significantly underestimate the infrared-to-radio luminosity ratio (qIR) for >17 per cent of the SFGs with measured flux density at the three radio frequencies in our sample, because their radio spectra are significantly flatter at low frequency (0.33–1.3 GHz).

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MIGHTEE: are giant radio galaxies more common than we thought?

Cited by 36 publications

References 74 publications

Feedback from Active Galactic Nuclei in Galaxy Groups

Feedback from Active Galactic Nuclei in Galaxy Groups

MIGHTEE: total intensity radio continuum imaging and the COSMOS/XMM-LSS Early Science fields

Radio spectral properties of star-forming galaxies in the MIGHTEE-COSMOS field and their impact on the far-infrared-radio correlation

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