Field not found.

Fermi conferma una significativa periodicità nell’emissione di raggi gamma di un blazar

20 December 2024

The international collaboration of NASA’s Fermi Large Area Telescope (LAT) mission, in which INFN participates, analysing over 15 years of observations, has confirmed a significant periodic oscillation in the gamma-ray electromagnetic flux and in other electromagnetic bands emitted by the relativistic jet of blazar PG 1553+113, about 5 billion light-years from Earth. The results of the observations were illustrated in a study published in The Astrophysical Journal. The first indication of a periodic oscillation capable of modulating the observed brightness at high energy emitted by PG 1553+113 was the focus of a paper written by the same research group within the LAT Collaboration in 2015. Now, nine years later, the oscillation is confirmed with greater significance thanks to the continuous monitoring of the sky in gamma rays, conducted by Fermi LAT. This discovery represents the first cyclic gamma-ray emission on the scale of years that has ever been detected with sufficient significance from an active galaxy. This could offer new insights into the physical processes close to the supermassive black hole and its relativistic jet.

 

Illustrazione di un blazar ©S.Ciprini

You might also be interested in

Immagine: MEG II ©PSI

In search of new physics: MEG II updates its record

PADME experiment_Frascati National Laboratories_INFN

New results from the Padme experiment in the search for the X17 particle

Hot aisle of the machine room at the INFN Turin computing center.

Computing Technologies for the Einstein Telescope: CTLAB4ET Laboratory inaugurated in Turin

ELI Beamlines building in Prague, Czech Republic ©ELI ERIC

EuPRAXIA chooses ELI Beamlines as second site for laser-driven accelerator

LHCb experiment at CERN (©CERN)

Matter in the mirror: difference in behaviour between baryons and anti-baryons observed for the first time

INFN research associates awarded MUR FIS 2 funding

Quantum detectors, physics of rare events and gravitational waves: the Italian Ministry of University and Research funds three innovative INFN physics projects with over 5 million euros