The Intragroup Versus the Intracluster Medium

Cavaliere, A.; Fusco-Femiano, R.; Lapi, A.

doi:10.3847/0004-637x/824/2/145

Cited by 33 publications

(34 citation statements)

References 38 publications

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“…Radio AGNs in clusters are known to be associated with strong cool-core clusters, clusters that are typically in a relaxed state (e.g. Mittal et al 2009;Cavaliere, Fusco-Femiano & Lapi 2016). Relaxed clusters, in general, might be expected to have higher quiescent fractions (e.g.…”

Section: Effect Of Cluster Environmentsmentioning

confidence: 99%

Possible evidence of the radio AGN quenching of neighbouring galaxies atz∼ 1

Shen

Tomczak

Lemaux

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Using 57 radio active galactic nuclei (RAGNs) at 0.55 ≤ z ≤ 1.3 drawn from five fields of the Observations of Redshift Evolution in Large-Scale Environments (ORELSE) survey, we study the effect of injection of energy from outbursts of RAGN on their spectroscopically confirmed neighbouring galaxies (SNGs). We observe an elevated fraction of quenched neighbours (f q ) within 500 kpc projected radius of RAGN in the most dense local environments compared to those of non-RAGN control samples matched to the RAGN population in colour, stellar mass, and local environment at 2σ significance. Further analyses show that there are offsets at similar significance between f q s of RAGN-SNGs and the appropriate control samples for galaxies specifically in cluster environments and those hosted by most massive cluster galaxies, which tentatively suggests that some negative feedback from the RAGN is occurring in these dense environments. In addition, we find that the median radio power of RAGN increases with increasing local overdensity, an effect which may lend itself to the quenching of neighbouring galaxies. Furthermore, we find that, in the highest local overdensities, the f q of the sub-sample of lower stellar mass RAGN-SNGs is larger than that of the higher stellar mass RAGN-SNGs sub-sample, which indicates a more pronounced effect from RAGN on lower stellar mass galaxies. We propose a scenario in which RAGN residing within clusters might heat the intracluster medium (ICM) affecting both in situ star formation and any inflowing gas that remains in their neighbouring galaxies.

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Section: Effect Of Cluster Environmentsmentioning

confidence: 99%

Possible evidence of the radio AGN quenching of neighbouring galaxies atz∼ 1

Shen

Tomczak

Lemaux

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…These particular studies considered simplistic uniform environments, but further (semi-) analytic models (e.g. Turner & Shabala 2015;Hardcastle 2018) refined this picture to consider radio source environments, such as power-law (Kaiser & Alexander 1997), 𝛽 model (Cavaliere & Fusco-Femiano 1978) and halo mass dependent atmospheres (Arnaud et al 2010). Numerical simulations which include more detailed physics such as bulk relativistic flow, magnetic fields and spectral ageing have been performed for many years (e.g.…”

Section: Introductionmentioning

confidence: 99%

A low-frequency sub-arcsecond view of powerful radio galaxies in rich-cluster environments: 3C 34 and 3C 320

Mahatma

Basu

Hardcastle

et al. 2023

Monthly Notices of the Royal Astronomical Society

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Models of radio galaxy physics have been primarily based on high frequency (≥1 GHz) observations of their jets, hotspots, and lobes. Without highly resolved low frequency observations, which provide information on older plasma, our understanding of the dynamics of radio galaxies and their interaction with their environment is limited. Here, we present the first sub-arcsecond (0.3”) resolution images at 144 MHz of two powerful radio galaxies situated in rich cluster environments, namely 3C 34 and 3C 320, using the International Low Frequency Array Telescope. We detect for the first time at low frequencies a plethora of structures in these objects, including strikingly large filaments across the base of the lobes in both sources, which are spatially associated with dense regions in the ambient medium. For 3C 34 we report a spectral flattening in the region of the central filament, suggesting that the origin of the filaments is related to the presence of large-scale ordered magnetic fields. We also report periodic total intensity and spectral index banding of diffuse emission in the eastern lobe, seen for the first time in radio galaxy lobes. The hotspot complexes are resolved into multiple fragments of varying structure and spectral index; we discuss the implications for particle acceleration and jet termination models. We find at most smooth gradients in the spectral behaviour of the hotspot structure suggesting that particle acceleration, if present, may be occurring throughout the complex, in contrast to simple models, but different jet termination models may apply to both sources.

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“…Werk et al (2014) and references therein). For the radial baryon density law of the X-ray halo, we assume a β-profile (Cavaliere & Fusco-Femiano 1976):…”

Section: Mass Of the Hot-cgm In The X-ray Halomentioning

confidence: 99%

X-Ray Detection of the Galaxy's Missing Baryons in the Circum-Galactic Medium of L$^*$ Galaxies

Nicastro¹,

Krongold²,

Fang³

et al. 2023

Preprint

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The amount of baryons hosted in the disks of galaxies is lower than expected based on the mass of their dark-matter halos and the fraction of baryon-to-total matter in the universe, giving rise to the so called galaxy missing-baryon problem. The presence of cool circum-galactic matter gravitationally bound to its galaxy's halo up to distances of at least ten times the size of the galaxy's disk, mitigates the problem but is far from being sufficient for its solution. It has instead been suggested, that the galaxy missing baryons may hide in a much hotter gaseous phase of the circum-galactic medium, possibly near the halo virial temperature and co-existing with the cool phase. Here we exploit the best available X-ray spectra of known cool circum-galactic absorbers of L * galaxies to report the first direct high-statistical-significance (5.3−6.8σ) detection of associated O vii and N vi absorption in the stacked XMM-Newton and Chandra spectra of three quasars. We show that these absorbers trace hot medium in the X-ray halo of these systems, at logT(in k) 5.88 − 6.1 K (comprising the halo virial temperature T vir = 10 6 K). We estimate a mass of the X-ray halo M hot−CGM (1.4−1.6)×10 11 M , corresponding, for these systems, to a galaxy missing baryon fraction ξ = M hot−CGM /M missing 0.99 − 1.13 and thus closing the galaxy baryon census in typical L * galaxies. Our measurements contribute significantly to the solution of the long-standing galaxy missing baryon problem and to the understanding of the continuous cycle of baryons in-and-out of galaxies throughout the life of the universe.

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The Intragroup Versus the Intracluster Medium

Cited by 33 publications

References 38 publications

Possible evidence of the radio AGN quenching of neighbouring galaxies atz∼ 1

Possible evidence of the radio AGN quenching of neighbouring galaxies atz∼ 1

A low-frequency sub-arcsecond view of powerful radio galaxies in rich-cluster environments: 3C 34 and 3C 320

X-Ray Detection of the Galaxy's Missing Baryons in the Circum-Galactic Medium of L$^*$ Galaxies

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