Pith. sign in

REVIEW 1 cited by

Gamma-ray flaring activity of NGC 1275 in 2016-2017 measured by MAGIC

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv 1806.01559 v1 pith:SANBJ42K submitted 2018-06-05 astro-ph.HE

Gamma-ray flaring activity of NGC 1275 in 2016-2017 measured by MAGIC

MAGIC collaboration: S. Ansoldi , L. A. Antonelli , C. Arcaro , D. Baack , A. Babi\'c , B. Banerjee , P. Bangale , U. Barres de Almeida
show 146 more authors
J. A. Barrio J. Becerra Gonz\'alez W. Bednarek E. Bernardini R. Ch. Berse A. Berti W. Bhattacharyya C. Bigongiari A. Biland O. Blanch G. Bonnoli R. Carosi G. Ceribella A. Chatterjee S. M. Colak P. Colin E. Colombo J. L. Contreras J. Cortina S. Covino P. Cumani V. D'Elia P. Da Vela F. Dazzi A. De Angelis B. De Lotto M. Delfino J. Delgado F. Di Pierro A. Dom\'inguez D. Dominis Prester D. Dorner M. Doro S. Einecke D. Elsaesser V. Fallah Ramazani A. Fattorini A. Fern\'andez-Barral G. Ferrara D. Fidalgo L. Foffano M. V. Fonseca L. Font C. Fruck D. Galindo S. Gallozzi R. J. Garc\'ia L\'opez M. Garczarczyk M. Gaug P. Giammaria N. Godinovi\'c D. Gora D. Guberman D. Hadasch A. Hahn T. Hassan M. Hayashida J. Herrera J. Hoang J. Hose D. Hrupec K. Ishio Y. Konno H. Kubo J. Kushida A. Lamastra D. Lelas F. Leone E. Lindfors S. Lombardi F. Longo M. L\'opez C. Maggio P. Majumdar M. Makariev G. Maneva M. Manganaro K. Mannheim L. Maraschi M. Mariotti M. Mart\'inez S. Masuda D. Mazin K. Mielke M. Minev J. M. Miranda R. Mirzoyan A. Moralejo V. Moreno E. Moretti T. Nagayoshi V. Neustroev A. Niedzwiecki M. Nievas Rosillo C. Nigro K. Nilsson D. Ninci K. Nishijima K. Noda L. Nogu\'es S. Paiano J. Palacio D. Paneque R. Paoletti J. M. Paredes G. Pedaletti P. Pe\~nil M. Peresano M. Persic K. Pfrang P. G. Prada Moroni E. Prandini I. Puljak J. R. Garcia I. Reichardt W. Rhode M. Rib\'o J. Rico C. Righi A. Rugliancich L. Saha T. Saito K. Satalecka T. Schweizer J. Sitarek I. \v{S}nidari\'c D. Sobczynska A. Stamerra M. Strzys T. Suri\'c M. Takahashi F. Tavecchio P. Temnikov T. Terzi\'c M. Teshima N. Torres-Alb\`a S. Tsujimoto G. Vanzo M. Vazquez Acosta I. Vovk J. E. Ward M. Will D. Zari\'c D. Glawion L.O. Takalo J. Jormanainen
This is my paper
classification astro-ph.HE
keywords fluxgamma-raymagicmeasuredobservedvariabilityactivityaround
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
0 comments
read the original abstract

We report on the detection of flaring activity from the Fanaroff-Riley I radio galaxy NGC 1275 in very-high-energy (VHE, E $>$ 100 GeV) gamma rays with the MAGIC telescopes. Observations were performed between 2016 September and 2017 February as part of a monitoring program. The brightest outburst with $\sim1.5$ times the Crab Nebula flux above 100 GeV (C.U.) was observed during the night between 2016 December 31 and 2017 January 1 (fifty times higher than the mean previously measured in two observational campaigns between 2009 and 2011). Significant variability of the day-by-day light curve was measured, the shortest flux-doubling time-scales was found to be of $(611\pm101)$ min. The combined spectrum of the MAGIC data during the strongest flare state and simultaneous data from the Fermi-LAT around 2017 January 1 follows a power-law with an exponential cutoff at the energy $(492\pm35)$ GeV. Simultaneous optical flux density measurements in the R-band obtained with the KVA telescope are also presented and the correlation between the optical and gamma-ray emission is investigated. Due to possible internal pair-production, the fast flux variability constrains the Doppler factor to values which are inconsistent with a large viewing angle as observed in the radio band. We investigate different scenarios for the explanation of fast gamma-ray variability, namely emission from: magnetospheric gaps, relativistic blobs propagating in the jet (mini-jets) or external cloud (or star) entering the jet. We find that the only plausible model to account for the luminosities here observed would be the production of gamma rays in a magnetospheric gap around the central black hole only in the eventuality of an enhancement of the magnetic field threading the hole from its equipartition value with the gas pressure in the accretion flow.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Fermi-Large Area Telescope Detection of Very High Energy (>100 GeV) Emission from Compton-Dominated Blazars

    astro-ph.HE 2026-07 accept novelty 6.0

    Systematic Fermi-LAT search detects VHE emission from 14 Compton-dominated blazars (4 new at >5σ) and constrains the emitting region to >1.1–1.4 BLR radii.