Search results for "X-shaped radio galaxy"

showing 5 items of 5 documents

Black hole lightning due to particle acceleration at subhorizon scales

2015

Supermassive black holes with masses of millions to billions of solar masses are commonly found in the centers of galaxies. Astronomers seek to image jet formation using radio interferometry, but still suffer from insufficient angular resolution. An alternative method to resolve small structures is to measure the time variability of their emission. Here, we report on gamma-ray observations of the radio galaxy IC 310 obtained with the MAGIC telescopes revealing variability with doubling time scales faster than 4.8 min. Causality constrains the size of the emission region to be smaller than 20\% of the gravitational radius of its central black hole. We suggest that the emission is associated …

Black HolesRadio galaxyAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsVery High Energy Gamma AstronomyBlack Holes Very High Energy Gamma Astronomy Active Galactic NucleiX-shaped radio galaxysupermassive black hole ; jet formation ; IC 310 ; MAGIC telescopesAstrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)astro-ph.HESupermassive black holeta115MultidisciplinaryPhysicsActive Galactic NucleiAstronomy and AstrophysicsGalaxyIntermediate-mass black holeStellar black holeElectrónicaFísica nuclearddc:500Spin-flipElectricidadAstrophysics - High Energy Astrophysical PhenomenaSchwarzschild radius
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Three Peculiar Objects From a New Sample of Radio Galaxies

2001

We have constructed a new sample of 84 large angular size radio galaxies selected from the NRAO VLA Sky Survey (NVSS). Radio sources with declination above +60°, total flux density greater than 100 mJy at 1.4 GHz and angular size larger then 4′ have been selected and observed with the VLA at 1.4 and 4.9 GHz. A number of peculiar radio galaxies have been discovered, of which we present here results on J1835+620, J2114+820 and J2157+664.

NRAO VLA Sky SurveyPhysicsLuminous infrared galaxyX-shaped radio galaxyAngular diameterRadio galaxyAstrophysicsSample (graphics)Declination
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VLBI Observations of FRI Radio Galaxies

1996

The Fanaroff-Riley type I radio galaxies (Fanaroff & Riley, 1974) presented in this paper belong to the complete sample of low-intermediate luminosity radio galaxies published in Giovannini, Feretti & Comoretto (1990). This sample includes radio galaxies with different morphologies on the arcsecond scale, such as compact sources, core-halos, FRIs and FRIIs.

PhysicsLuminous infrared galaxyProper motionX-shaped radio galaxyRadio galaxyAstrophysics::High Energy Astrophysical PhenomenaVery-long-baseline interferometryAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsAstrophysics::Galaxy AstrophysicsLuminosity
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VLBI Observations of Radio Galaxies

1994

We undertook a project of observation of a complete sample of radio galaxies with the VLBI technique, in order to test: a) current models on jet dynamics and b) the radio source unified schemes. A preliminary analysis based on the data obtained by us for 10 galaxies of our sample indicates that the parsec scale structure in low power radio galaxies (FR-I) and high power radio galaxies (FR-II) is essentially the same.

PhysicsLuminous infrared galaxyX-shaped radio galaxyRadio galaxyAstrophysics::High Energy Astrophysical PhenomenaVery-long-baseline interferometryScale structureQuasarAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsAstrophysics::Galaxy AstrophysicsGalaxyParsec
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VLBI Observations of a Complete Sample of Radio Galaxies. VII. Study of the FR I Sources 3C 31, 4C 35.03, and 3C 264

1997

We present results from global VLBI and VLA observations of three FanaroU-Riley type I radio gal- axies, 3C 31, 4C 35.03, and 3C 264, at a frequency of 5 GHz. In all three cases, we observe asymmetric parsec-scale structures consisting of a compact core and a single jet pointing in the direction of the more prominent kiloparsec jet. We interpret such alignment as evidence for the relativistic nature of FR I radio jets at parsec scales. Comparing the VLBI and VLA images of these sources, we —nd a progressive deceleration of the plasma —ow from parsec to kiloparsec scales. We consider another —ve FR I radio galaxies studied previously by us and —nd that, in a set of eight FR I objects, the es…

PhysicsX-shaped radio galaxySpace and Planetary ScienceRadio galaxyVery-long-baseline interferometryAstronomyAstronomy and AstrophysicsAstrophysicsGalaxyThe Astrophysical Journal
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