The Morphology of Extragalactic Radio Sources of High and Low Luminosity

Fanaroff, B. L.; Riley, J. M.

doi:10.1093/mnras/167.1.31p

Cited by 2,693 publications

(2,261 citation statements)

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“…The radio source has a 1.4 GHz integrated flux density of 98 mJy, which translates to a total power of L1.4 GHz ∼10 24 W Hz −1 . This is consistent with the morphological class FRI (Fanaroff & Riley 1974). Keel et al (2006) suggest the unusual nature of 0313-192 may be attributed to the combination of a number of factors.…”

Section: Radio Galaxies That Are Hosted By Spiralssupporting

confidence: 87%

J1649+2635: a grand-design spiral with a large double-lobed radio source

Mao

Owen

Duffin

et al. 2014

Monthly Notices of the Royal Astronomical Society

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We report the discovery of a grand-design spiral galaxy associated with a double-lobed radio source. J1649+2635 (z = 0.0545) is a red spiral galaxy with a prominent bulge that it is associated with a L 1.4 GHz ∼10 24 W Hz −1 double-lobed radio source that spans almost 100 kpc. J1649+2635 has a black hole mass of M BH ∼ 3-7 × 10 8 M ⊙ and SFR ∼ 0.26 -2.6 M ⊙ year −1 . The galaxy hosts a ∼96 kpc diffuse optical halo, which is unprecedented for spiral galaxies. We find that J1649+2635 resides in an overdense environment with a mass of M dyn = 7.7 +7.9 −4.3 × 10 13 M ⊙ , likely a galaxy group below the detection threshold of the ROSAT All-Sky Survey. We suggest one possible scenario for the association of double-lobed radio emission from J1649+2635 is that the source may be similar to a Seyfert galaxy, located in a denser-than-normal environment. The study of spiral galaxies that host large-scale radio emission is important because although rare in the local Universe, these sources may be more common at high-redshifts.

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Section: Radio Galaxies That Are Hosted By Spiralssupporting

confidence: 87%

J1649+2635: a grand-design spiral with a large double-lobed radio source

Mao

Owen

Duffin

et al. 2014

Monthly Notices of the Royal Astronomical Society

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“…A bright linearly shaped FRI radio source (Fanaroff & Riley 1974) is located to the southeast. This source is associated with an elliptical foreground galaxy (2MASX J07173724 +3744224) located at z=0.1546 (Bonafede et al 2009).…”

Section: Continuum Imagesmentioning

confidence: 99%

Chandra and JVLA Observations of HST Frontier Fields Cluster MACS J0717.5+3745

Weeren

Ogrean

Jones

et al. 2017

ApJ

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To investigate the relationship between thermal and non-thermal components in merger galaxy clusters, we present deep JVLA and Chandraobservations of the HST Frontier Fields cluster MACSJ0717.5+3745. The Chandraimage shows a complex merger event, with at least four components belonging to different merging subclusters. Northwestof the cluster, ∼0.7 Mpc from the center, there is a ram-pressure-stripped core that appears to have traversed the densest parts of the cluster after entering the intracluster medium (ICM) from the direction of a galaxy filament to the southeast. We detect a density discontinuity north-northeastof this core, which we speculate is associated with a cold front. Our radio images reveal new details for the complex radio relic and radio halo in this cluster. In addition, we discover several new filamentary radio sources with sizes of 100-300kpc. A few of these seem to be connected to the main radio relic, while others are either embedded within the radio halo or projected onto it. A narrow-angled-tailed (NAT) radio galaxy, a cluster member, is located at the center of the radio relic. The steep spectrum tails of this active galactic nucleuslead into the large radio relic where the radio spectrum flattens again. This morphological connection between the NAT radio galaxy and relic provides evidence for reacceleration (revival) of fossil electrons. The presence of hot 20 keV ICM gas detected by Chandranear the relic location provides additional support for this re-acceleration scenario.

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“…The active nucleus in these systems is fully obscured or partially obscured. RGs are generally separated into two Fanaroff-Riley (FR) types, distinguishable by the strength of their radio emission (Fanaroff & Riley 1974). FR Type I (FR I) galaxies are of lower radio luminosity.…”

Section: Agn As Candidate Neutrino Sourcesmentioning

confidence: 99%

High-energy neutrino fluxes from AGN populations inferred from X-ray surveys

Jacobsen

et al. 2015

Mon. Not. R. Astron. Soc.

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High-energy neutrinos and photons are complementary messengers, probing violent astrophysical processes and structural evolution of the Universe. X-ray and neutrino observations jointly constrain conditions in active galactic nuclei (AGN) jets: their baryonic and leptonic contents, and particle production efficiency. Testing two standard neutrino production models for local source Cen A (Koers & Tinyakov 2008; Becker & Biermann 2009), we calculate the high-energy neutrino spectra of single AGN sources and derive the flux of high-energy neutrinos expected for the current epoch. Assuming that accretion determines both X-rays and particle creation, our parametric scaling relations predict neutrino yield in various AGN classes. We derive redshift-dependent number densities of each class, from Chandra and Swift/BAT X-ray luminosity functions (Silverman et al. 2008;Ajello et al. 2009). We integrate the neutrino spectrum expected from the cumulative history of AGN (correcting for cosmological and source effects, e.g. jet orientation and beaming). Both emission scenarios yield neutrino fluxes well above limits set by IceCube (by " 4-10 6ˆa t 1 PeV, depending on the assumed jet models for neutrino production). This implies that: (i) Cen A might not be a typical neutrino source as commonly assumed; (ii) both neutrino production models overestimate the efficiency; (iii) neutrino luminosity scales with accretion power differently among AGN classes and hence does not follow X-ray luminosity universally; (iv) some AGN are neutrino-quiet (e.g. below a power threshold for neutrino production); (v) neutrino and X-ray emission have different duty cycles (e.g. jets alternate between baryonic and leptonic flows); or (vi) some combination of the above.

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The Morphology of Extragalactic Radio Sources of High and Low Luminosity

Cited by 2,693 publications

References 0 publications

J1649+2635: a grand-design spiral with a large double-lobed radio source

J1649+2635: a grand-design spiral with a large double-lobed radio source

Chandra and JVLA Observations of HST Frontier Fields Cluster MACS J0717.5+3745

High-energy neutrino fluxes from AGN populations inferred from X-ray surveys

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