3HSP J095507.9+355101: A flaring extreme blazar coincident in space and time with IceCube-200107A
Abstract
The uncertainty region of the highly energetic neutrino IceCube200107A includes 3HSP J095507.9+355101 (z = 0.557), an extreme blazar, which was detected in a high, very hard, and variable X-ray state shortly after the neutrino arrival. Following a detailed multiwavelength investigation, we confirm that the source is a genuine BL Lac. This new detection differs from TXS 0506+056, which is thus far the first source associated with IceCube neutrinos, and is considered a "masquerading" BL Lac. As in the case of TXS 0506+056, 3HSP J095507.9+355101 is also way off the so-called blazar sequence. We consider 3HSP J095507.9+355101 a possible counterpart to the IceCube neutrino. Finally, we discuss some theoretical implications in terms of neutrino production.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 2020
- DOI:
- 10.1051/0004-6361/202038423
- arXiv:
- arXiv:2003.06405
- Bibcode:
- 2020A&A...640L...4G
- Keywords:
-
- neutrinos;
- radiation mechanisms: non-thermal;
- galaxies: active;
- gamma rays: galaxies;
- BL Lacertae objects: general;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Accepted for publication in A&