Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 484, Issue 1, Pages L104-L108Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slz011
Keywords
neutrinos; radiation mechanisms: no-thermal; galaxies: active; BL Lacertae objects: general; gamma-rays: galaxies
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Funding
- ASI Science Data Center (SSDC)
- Technische Universitat Munchen-Institute for Advanced Studies - German Excellence Initiative
- European Union [291763]
- Lyman Jr. Spitzer Postdoctoral Fellowship
- Deutsche Forschungsgemeinschaft [SFB 1258]
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We present evidence that TXS 0506+056, the first plausible non-stellar neutrino source, despite appearances, is not a blazar of the BL Lac type but is instead a masquerading 131, Lac, i,e. intrinsically a fiat-spectrum radio quasar with hidden broad lines and a standard accretion disc, This reclassification is based on: (I) its radio and O II luminosities; (2) its emission line ratios; (3) its Eddington ratio, We also point out that the synchrotron peak frequency of TXS 0506+056 is more than two orders of magnitude larger than expected by the so-called 'blazar sequence', a scenario which has been assumed by some theoretical models predicting neutrino (and cosmic ray) emission from blazars. Finally, we comment on the theoretical implications this reclassification has on the location of the gamma-ray emitting region and our understanding of neutrino emission in blazars.
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