Hosts and environments: a (large-scale) radio history of AGN and star-forming galaxies

Magliocchetti, M.

doi:10.1007/s00159-022-00142-1

Cited by 23 publications

(2 citation statements)

References 392 publications

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“…To date, we can only tell them apart based on morphological structures, e.g., jets and lobes. These morphological properties are, however, not easily accessible even with inputs from other photometric or spectroscopic surveys [422]. In addition, understanding AGN populations and the physical mechanisms behind them require high-resolution simulations.…”

Section: Simulations For Radio Sourcesmentioning

confidence: 99%

Cosmological Probes of Structure Growth and Tests of Gravity

et al. 2023

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The current standard cosmological model is constructed within the framework of general relativity with a cosmological constant Λ, which is often associated with dark energy, and phenomenologically explains the accelerated cosmic expansion. Understanding the nature of dark energy is one of the most appealing questions in achieving a self-consistent physical model at cosmological scales. Modification of general relativity could potentially provide a more natural and physical solution to the accelerated expansion. The growth of the cosmic structure is sensitive in constraining gravity models. In this paper, we aim to provide a concise introductory review of modified gravity models from an observational point of view. We will discuss various mainstream cosmological observables, and their potential advantages and limitations as probes of gravity models.

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Section: Simulations For Radio Sourcesmentioning

confidence: 99%

Cosmological Probes of Structure Growth and Tests of Gravity

et al. 2023

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“…This is consistent with Hickox et al (2009) and numerous studies (Magliocchetti 2022 and references therein) which claim that radio AGN are more likely in massive, red galaxies where they are important in maintaining quenching. The mechanisms triggering radio AGN are expected to be related to the stellar mass of the galaxy (Magliocchetti 2022) and not external triggers.…”

Section: Dependence Of Agn Fraction On Galaxy Propertiesmentioning

confidence: 99%

A Multiwavelength Study of Active Galactic Nuclei in Post-Merger Remnants

Li¹,

Nair²,

Irwin³

et al. 2023

Preprint

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We investigate the role of galaxy mergers in triggering AGN in the nearby Universe. Our analysis is based on a sample of 79 post-merger remnant galaxies with deep X-ray observations from Chandra/XMM-Newton capable of detecting a low-luminosity AGN of ≥ 10 40.5 erg s −1 . This sample is derived from a visually classified, volume-limited sample of 807 post-mergers identified in the Sloan Digital Sky Survey Data Release 14 with log M * /M ≥ 10.5 and 0.02 ≤z≤ 0.06. We find the X-ray AGN fraction in this sample is 55.7%±5.6% compared to 23.6%±2.8% for a mass and redshift matched non-interacting control sample. The multi-wavelength AGN fraction (identified as an AGN in one of X-ray, IR, radio or optical diagnostics) for post-mergers is 76.6% ± 4.8% compared to 39.1% ± 3.2% for controls. Thus post-mergers exhibit a high overall AGN fraction with an excess between 2 -4 depending on the AGN diagnostics used. In addition, we find most optical, IR, and radio AGN are also identified as X-ray AGN while a large fraction of X-ray AGN are not identified in any other diagnostic. This highlights the importance of deep X-ray imaging to identify AGN. We find the X-ray AGN fraction of post-mergers is independent of stellar mass above log M * /M ≥ 10.5 unlike the trend seen in control galaxies. Overall, our results show that post-merger galaxies are a good tracer of the merger-AGN connection and strongly support the theoretical expectations that mergers trigger AGN.

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The nature of compact radio sources: the case of FR 0 radio galaxies

Baldi

2023

Astron Astrophys Rev

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Radio-loud compact radio sources (CRSs) are characterised by morphological compactness of the jet structure centred on the active nucleus of the galaxy. Most of the local elliptical galaxies are found to host a CRS with nuclear luminosities lower than those of typical quasars, $$\lesssim 10^{42}\, \text{erg}\, \text{s}^{-1}$$ ≲ 10 42 erg s - 1 . Recently, low-luminosity CRSs with a LINER-like optical spectrum have been named Fanaroff–Riley (FR) type 0 to highlight their lack of substantially extended radio emission at kpc scales, in contrast with the other Fanaroff–Riley classes, full-fledged FR Is and FR II radio galaxies. FR 0s are the most abundant class of radio galaxies in the local Universe, and characterised by a higher core dominance, poorer Mpc-scale environment and smaller (sub-kpc scale, if resolved) jets than FR Is. However, FR 0s share similar host and nuclear properties with FR Is. A different accretion–ejection paradigm from that in place in FR Is is invoked to account for the parsec-scale FR 0 jets. This review revises the state-of-the-art knowledge about FR 0s, their nature, and which open issues the next generation of radio telescopes can solve in this context.

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Hosts and environments: a (large-scale) radio history of AGN and star-forming galaxies

Cited by 23 publications

References 392 publications

Cosmological Probes of Structure Growth and Tests of Gravity

Cosmological Probes of Structure Growth and Tests of Gravity

A Multiwavelength Study of Active Galactic Nuclei in Post-Merger Remnants

The nature of compact radio sources: the case of FR 0 radio galaxies

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