English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A neutrino with energy of $\sim$290 TeV, IceCube-170922A, was detected incoincidence with the BL Lac object TXS~0506+056 during enhanced gamma-rayactivity, with chance coincidence being rejected at $\sim 3\sigma$ level. Wemonitored the object in the very-high-energy (VHE) band with the MAGICtelescopes for $\sim$41 hours from 1.3 to 40.4 days after the neutrinodetection. Day-timescale variability is clearly resolved. We interpret thequasi-simultaneous neutrino and broadband electromagnetic observations with anovel one-zone lepto-hadronic model, based on interactions of electrons andprotons co-accelerated in the jet with external photons originating from aslow-moving plasma sheath surrounding the faster jet spine. We can reproducethe multiwavelength spectra of TXS 0506+056 with neutrino rate and energycompatible with IceCube-170922A, and with plausible values for the jet power of$\sim 10^{45} - 4 \times 10^{46} {\rm erg \ s^{-1}}$. The steep spectrumobserved by MAGIC is concordant with internal $\gamma\gamma$ absorption above afew tens of GeV entailed by photohadronic production of a $\sim$290 TeVneutrino, corroborating a genuine connection between the multi-messengersignals. In contrast to previous predictions of predominantly hadronic emissionfrom neutrino sources, the gamma-rays can be mostly ascribed to inverse Comptonup-scattering of external photons by accelerated electrons. The X-ray and VHEbands provide crucial constraints on the emission from both acceleratedelectrons and protons. We infer that the maximum energy of protons in the jetco-moving frame can be in the range $\sim 10^{14}$ to $10^{18}$ eV.

The blazar TXS 0506+056 associated with a high-energy neutrino: insights into extragalactic jets and cosmic ray acceleration