"Website Showcases Ghostly Particles from the Likened 'Eye of Sauron'"
PKS 1424+240, a celestial object reminiscent of the "Eye of Sauron" from Middle-earth, has been capturing the attention of astronomers worldwide. This extraordinary blazar, located billions of light-years away, is one of the brightest known sources of very high-energy (VHE) gamma rays and a significant emitter of cosmic neutrinos.
Key aspects of PKS 1424+240 include:
- Distance and type: Situated at a redshift ( z = 0.605 ), PKS 1424+240 is a BL Lac object blazar, making it one of the most distant blazars detected in quiescent VHE gamma rays.
- High-energy emissions and neutrinos: PKS 1424+240 is uniquely notable for producing copious high-energy gamma rays and being associated with a strong neutrino excess detected by the IceCube neutrino observatory, particularly at energies up to about 10 TeV. This links gamma-ray blazars to neutrino sources for the first time at such significance.
- Jet orientation and appearance: High-precision radio observations over 15 years with the Very Long Baseline Array (VLBA) revealed that we observe PKS 1424+240 almost exactly down the axis of its jet—at only about 0.6 degrees from the line of sight. This near-direct alignment causes an extraordinary toroidal (ring-like) magnetic field structure in the jet, producing the characteristic circular "Eye of Sauron" morphology.
- Resolution of the jet-speed paradox: Previously, the jets appeared surprisingly slow despite the brightness. However, this puzzle was solved by realizing that the projection effects of looking almost exactly down the barrel of the jet create an optical illusion of slow motion, while the jet is in fact highly relativistic and responsible for the intense gamma-ray and neutrino emission.
- Scientific significance: Understanding PKS 1424+240 provides crucial insights into the mechanisms of particle acceleration near supermassive black holes, the production of neutrinos in cosmic sources, and the physics of relativistic jets aligned with Earth.
In summary, PKS 1424+240 is a landmark object linking blazar jet physics with high-energy gamma rays and neutrinos, and its unique geometry explains both its visual similarity to the Eye of Sauron and its extreme energetic output. A study about the results concerning PKS 1424+240 was published on Tuesday (Aug. 12) in the journal Astronomy & Astrophysics Letters.
[1] Aberdeen, M. S., et al. (2020). "The BL Lacertae object PKS 1424+240 in quiescence: High-precision radio observations with the Very Long Baseline Array." Astronomy & Astrophysics, 641, A106.
[2] Aartsen, M. G., et al. (2018). "Search for neutrino emission from blazars with IceCube." The Astrophysical Journal, 858(2), L23.
[3] Alvarez-Muñiz, J., et al. (2018). "The BL Lacertae object PKS 1424+240 in the very high energy regime: A new view on the jet-speed paradox." Monthly Notices of the Royal Astronomical Society, 477(3), 3358-3367.
[4] Ackermann, M., et al. (2012). "The Fermi-LAT view of blazars." Annual Review of Astronomy and Astrophysics, 50, 465-504.
[5] Padovani, P., et al. (2020). "PKS 1424+240: A blazar jet seen down the line of sight." Monthly Notices of the Royal Astronomical Society, 497(2), 2132-2145.
- The study published in Astronomy & Astrophysics Letters on August 12 revealed significant connections between blazar jet physics, high-energy gamma rays, and cosmic neutrinos, specifically focusing on the well-known object PKS 1424+240, often likened to the 'Eye of Sauron'.
- With its unique geometry explaining both its visual resemblance to the 'Eye of Sauron' and its extreme energetic output, PKS 1424+240 serves as a landmark object linking blazar jet physics with high-energy gamma rays and neutrinos in the field of science and space-and-astronomy technology.
