Faint γ-ray sources at low redshift: the radio galaxy IC 1531

Bassi, Tiziana; Migliori, G.; Grandi, P.; Vignali, C.; Baldi, Ranieri D.; Torresi, E.; Siemiginowska, Aneta; Stanghellini, C.

doi:10.1093/mnras/sty2622

Cited by 8 publications

(13 citation statements)

References 100 publications

(113 reference statements)

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“…The jet inclination is taken fromBassi et al (2018), which is consistent with our lower limit on R.2 Sidedness ratio estimated from archival radio data at 5 GHz (Paper I; see text for details). 3 θ jet not obtained from sidedness ratio, but from full modelling of the radio jets (seeLaing & Bridle 2014).…”

supporting

confidence: 62%

“…counter-jet is not securely detected, qualitatively consistent with its blazar classification (Bassi et al 2018) and a small value of θ jet . In this case, we placed the two boxes as close to the core as possible (Fig.…”

Section: Contributions (I) − (Iii) Are Propagated Through Equation 2 mentioning

confidence: 50%

“…• . Bassi et al (2018) presented a detailed multiwavelength study of IC 1531, and estimated the jet inclination angle to be θ jet = 15 • ± 5 • , consistent with this limit. We adopt their value.…”

Section: Contributions (I) − (Iii) Are Propagated Through Equation 2 mentioning

confidence: 57%

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The AGN fuelling/feedback cycle in nearby radio galaxies – III. 3D relative orientations of radio jets and CO discs and their interaction

Ruffa

Laing

Prandoni

et al. 2020

Monthly Notices of the Royal Astronomical Society

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This is the third paper of a series exploring the multi-frequency properties of a sample of eleven nearby low-excitation radio galaxies (LERGs) in the southern sky. We are conducting an extensive study of different galaxy components (stars, dust, warm and cold gas, radio jets) with the aim of better understanding the AGN fuelling/feedback cycle in LERGs. Here we present new, deep, sub-kpc resolution Karl G. Jansky Very Large Array (JVLA) data for five sample sources at 10 GHz. Coupling these data with previously-acquired Atacama Large Millimeter/submillimeter Array (ALMA) CO(2-1) observations and measurements of comparable quality from the literature, we carry out for the first time a full 3D analysis of the relative orientations of jet and disc rotation axes in six FR I LERGs. This analysis shows (albeit with significant uncertainties) that the relative orientation angles span a wide range (≈30○ − 60○). There is no case where both axes are accurately aligned and there is a marginally significant tendency for jets to avoid the disc plane. Our study also provides further evidence for the presence of a jet-CO disc interaction (already inferred from other observational indicators) in at least one source, NGC 3100. In this case, the limited extent of the radio jets, along with distortions in both the molecular gas and the jet components, suggest that the jets are young, interacting with the surrounding matter and rapidly decelerating.

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supporting

confidence: 62%

Section: Contributions (I) − (Iii) Are Propagated Through Equation 2 mentioning

confidence: 50%

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The AGN fuelling/feedback cycle in nearby radio galaxies – III. 3D relative orientations of radio jets and CO discs and their interaction

Ruffa

Laing

Prandoni

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…From this parameter, we estimated the bulk Lorentz Γ factor of the jet following the procedure discussed by [111]. Since the jet parameters are unknown, this method assumes the value for angle θ m that maximizes β, i.e., cos θ m = β, where β = v/c is the intrinsic jet speed, in units of c, and θ is the angle of the jet to the line of sight.…”

Section: Namementioning

confidence: 99%

The eMERLIN and EVN View of FR 0 Radio Galaxies

2021

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We present the results from high-resolution observations carried out with the eMERLIN UK-array and the European VLBI network (EVN) for a sample of 15 FR 0s, i.e., compact core-dominated radio sources associated with nearby early-type galaxies (ETGs), which represent the bulk of the local radio galaxy population. The 5 GHz eMERLIN observations available for five objects exhibit sub-mJy core components and reveal pc-scale twin jets for four out of five FR 0s once the eMERLIN and JVLA archival visibilities data are combined. The 1.66 GHz EVN observations available for 10 FR 0s display one- and two-sided jetted morphologies and compact cores. The pc-scale core emission contributes, on average, to about one tenth of the total extended radio emission, although we noted an increasing core contribution for flat-/inverted-spectrum sources. We found an unprecedented linear correlation between the pc-scale core luminosity (∼1021.3–1023.6 W Hz−1) and [O III] line luminosity, generally considered as proxy of the accretion power, for a large sample of LINER-type radio-loud low-luminosity active nuclei, all hosted in massive ETGs, which include FR 0s and FR Is. This result represents further evidence of a common jet–disc coupling in FR 0s and FR Is, despite then differing in kpc-scale radio structure. For our objects and for other FR 0 samples reported in the literature, we estimated the jet brightness sidedness ratios, which typically range between one and three. This parameter roughly gauges the jet bulk Lorentz factor Γ, which turns out to range from 1 to 2.5 for most of the sample. This corroborates the scenario that FR 0s are characterized by mildly relativistic jets, possibly as a result of lower-spinning black holes (BHs) than the highly spinning BHs of relativistic-jetted radio galaxies, FR Is.

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“…From this parameter we estimate the bulk Lorentz Γ factor of the jet following the procedure discussed by [16]. Since the jet parameters are unknown, this method assumes the value for angle θ m that maximizes β, i.e.…”

Section: Resultsmentioning

confidence: 99%