0000000000791100

AUTHOR

M. Bondi

showing 2 related works from this author

A dust-enshrouded tidal disruption event with a resolved radio jet in a galaxy merger

2018

Tidal disruption events (TDEs) are transient flares produced when a star is ripped apart by the gravitational field of a supermassive black hole (SMBH). We have observed a transient source in the western nucleus of the merging galaxy pair Arp 299 that radiated >1.5 × 10 erg at infrared and radio wavelengths but was not luminous at optical or x-ray wavelengths. We interpret this as a TDE with much of its emission reradiated at infrared wavelengths by dust. Efficient reprocessing by dense gas and dust may explain the difference between theoretical predictions and observed luminosities of TDEs. The radio observations resolve an expanding and decelerating jet, probing the jet formation and evol…

010504 meteorology & atmospheric sciencesGeneral Science & TechnologyInfraredAstronomyAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsGalaxy merger01 natural sciencesTidal disruption eventGravitational fieldMD Multidisciplinary0103 physical sciencesAstrophysics::Solar and Stellar AstrophysicsCOREBLACK-HOLES010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesHigh Energy Astrophysical Phenomena (astro-ph.HE)PhysicsJet (fluid)Supermassive black holeta115Science & TechnologyMultidisciplinaryAstrophysics - Astrophysics of GalaxiesGalaxyMultidisciplinary SciencesWavelengthAstrophysics of Galaxies (astro-ph.GA)Science & Technology - Other TopicsAstrophysics::Earth and Planetary AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaEMISSIONSTARS
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A sample of weak blazars at milli-arcsecond resolution

2015

We started a follow-up investigation of the Deep X-ray Radio Blazar Survey objects with declination >-10 deg. We undertook a survey with the EVN at 5GHz to make the first images of a complete sample of weak blazars, aiming at a comparison between high- and low-power samples of blazars. All of the 87 sources observed were detected. Point-like sources are found in 39 cases, and 48 show core-jet structure. According to the spectral indices previously obtained, 58 sources show a flat spectral index, and 29 sources show a steep spectrum or a spectrum peaking at a frequency around 1-2 GHz. Adding to the DXRBS objects we observed those already observed with ATCA in the southern sky, we found th…

PhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)AstrofísicaSpectral indexmedia_common.quotation_subjectAstrophysics::High Energy Astrophysical PhenomenaFluxFOS: Physical sciencesAstronomy and AstrophysicsQuasarAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics - Astrophysics of GalaxiesDeclinationLuminosity13. Climate actionSpace and Planetary ScienceSkyAstrophysics of Galaxies (astro-ph.GA)ROSATAstrophysics - High Energy Astrophysical PhenomenaBlazarAstrophysics::Galaxy Astrophysicsmedia_commonAstronomia Aparells i instruments
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