Происхождение Космических Лучей

Ginzburg, Vitalii L.

doi:10.3367/ufnr.0062.195706b.0037

Cited by 18 publications

(7 citation statements)

References 18 publications

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“…Several months passed and I became Markov of high-energy neutrinos from astrophysical sources. I duly emphasized, that these estimations were stimulated by his works [22,23]. After this talk prospects of high-energy neutrino astrophysics became one of the points of Ginzburg's permanent interest.…”

Section: Atmospheric Extra-atmospheric Neutrinos and A "Scientific Amentioning

confidence: 97%

“…My problem was to evaluate fluxes of cosmic neutrinos from the Crab nebula and from the galactic centre using energy arguments. Fortunately I was able to use the results of two recent papers of Vitaly L. Ginzburg (now Nobel prize laureate) on the origin of cosmic rays published in 1953 [22] and 1957 [23].…”

Section: From Radio To Neutrino and Gamma Observations Of Astrophysicmentioning

confidence: 99%

“…It is not clear whether these electrons were accelerated or they were produced as a result of nuclear collisions. In [23] there are some arguments in favor of the secondary origin of these electrons. Then 2 antineutrinos (2 neutrinos) and 1 neutrino (antineutrino) have to be produced together with each electron (positron) in JI-U.decays.…”

Section: From Radio To Neutrino and Gamma Observations Of Astrophysicmentioning

confidence: 99%

“…It means that 2 gammas are produced ...". Taking into account some data from [22] and [23] about the total number and energies of electrons and under some assumptions it was evaluated that "the neutrino flux from Crab could be equal to the atmospheric neutrino flux". Some speculations were made in [7] about possible neutrino sources in the centre of our Galaxy.…”

Section: From Radio To Neutrino and Gamma Observations Of Astrophysicmentioning

confidence: 99%

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Early Years of High-Energy Neutrino Physics in Cosmic Rays and Neutrino Astronomy (1957-1962)

Железных

2006

Int. J. Mod. Phys. A

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Ideas of deep underground and deep underwater detection of high-energy cosmic neutrinos were firstly suggested by Moisey Markov in the end of 50 lh . Frederic Reines was one of those who first detected high-energy atmospheric neutrinos in underground experiments in the middle of 60 Ll (as well as low energy reactor neutrinos 10 years earlier!). Markov and Reines closely collaborated in 70 th -80 th in discussion of alternative techniques for large-scale neutrino telescopes. Some events of 50 -80 years relating to the development of a new branch of Astronomy -the High-Energy Neutrino Astronomy, in which Markov and Reines took part, were described in my talk at ARENA Workshop. Below the first part of my talk at the Workshop is presented describing discussions and meetings the neutrino physics and astrophysics relating to the period 1957-1962 when I was Markov's student and later post-graduated student.

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Section: Atmospheric Extra-atmospheric Neutrinos and A "Scientific Amentioning

confidence: 97%

Section: From Radio To Neutrino and Gamma Observations Of Astrophysicmentioning

confidence: 99%

Section: From Radio To Neutrino and Gamma Observations Of Astrophysicmentioning

confidence: 99%

Section: From Radio To Neutrino and Gamma Observations Of Astrophysicmentioning

confidence: 99%

See 2 more Smart Citations

Early Years of High-Energy Neutrino Physics in Cosmic Rays and Neutrino Astronomy (1957-1962)

Железных

2006

Int. J. Mod. Phys. A

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“…The fundamentals of the formalism describing the synchrotron emission mechanisms were given by Ginzburg (1957) and later expanded by Kardashev (1962) in his seminal paper discussing various particle injection and energy loss processes, including synchrotron radiation. Pacholczyk (1970) and Jaffe & Perola (1973) expanded their analysis further.…”

Section: Appendix A: Synchrotron Emission Modelsmentioning

confidence: 99%

AGN duty cycle estimates for the ultra-steep spectrum radio relic VLSS J1431.8+1331

Shulevski

Morganti

Barthel

et al. 2015

A&A

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Context. Steep spectrum radio sources associated with active galactic nuclei (AGN) may contain remnants of past AGN activity episodes. Studying these sources gives us insight into the AGN activity history. Novel instruments like the LOw Frequency ARray (LOFAR) are enabling studies of these fascinating structures to be made at tens to hundreds of MHz with sufficient resolution to analyse their complex morphology. Aims. Our goal is to characterize the integrated and resolved spectral properties of VLSS J1431+1331 and estimate source ages based on synchrotron radio emission models, thus putting constraints on the AGN duty cycle. Methods. Using a broad spectral coverage, we have derived spectral and curvature maps, and used synchrotron ageing models to determine the time elapsed from the last time the source plasma was energized. We used LOFAR, Giant Metrewave Radio Telescope (GMRT) and Jansky Very Large Array (VLA) data. Results. We confirm the morphology and the spectral index values found in previous studies of this object. Based on our ageing analysis, we infer that the AGN that created this source currently has very low levels of activity or that it is switched off. The derived ages for the larger source component range from around 60 to 130 Myr, hinting that the AGN activity decreased or stopped around 60 Myr ago. We observe that the area around the faint radio core located in the larger source component is the youngest, while the overall age of the smaller source component shows it to be the oldest part of the source. Conclusions. Our analysis suggests that VLSS J1431.8+1331 is an intriguing, two-component source. The larger component seems to host a faint radio core, suggesting that the source may be an AGN radio relic. The spectral index we observe from the smaller component is distinctly flatter at lower frequencies than the spectral index of the larger component, suggesting the possibility that the smaller component may be a shocked plasma bubble. From the integrated source spectrum, we deduce that its shape and slope can be used as tracers of the activity history of this type of steep spectrum radio source. We discuss the implications this conclusion has for future studies of radio sources having similar characteristics.

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