scholarly journals Neutrinos from Relativistic Outflows of Fast Spinning Magnetars

2005 ◽  
Vol 22 (2) ◽  
pp. 157-161 ◽  
Author(s):  
Qinghuan Luo
Keyword(s):  
Gamma Rays ◽  
Neutrino Flux ◽  
Rotation Period ◽  
High Energy ◽  
Boundary Region ◽  
Stellar Envelope ◽  
Energetic Ions ◽  
Short Rotation ◽  
Polar Gap ◽  
High Energy Neutrinos

AbstractPulsars may be born with a short rotation period of milliseconds with the magnetic field amplified through dynamo processes up to ∼1015–1016 G. Such millisecond magnetars spin down rapidly, emitting bursts of high-energy neutrinos and gamma rays. Specifically, acceleration of ions in both the polar gap (as in a normal pulsar) and the relativistic magnetar wind is considered. In both cases ions can be accelerated to ultra-high energies and these energetic ions can lead to production of high-energy neutrinos and gamma rays through interaction with thermal radiation from the hot neutron star or the heated inner boundary region of the stellar envelope as the result of the deposition of energy by the magnetar wind. The detectability of the neutrino flux by a kilometre-scale neutrino detector such as the planned IceCube neutrino observatory is discussed.

scholarly journals Correlation of high energy neutrinos and gamma rays on the direction of Fermi Bubbles

2019 ◽  
Author(s):  
Paola Alvarez Hurtado ◽  
Nissim Fraija ◽  
Antonio Galván ◽  
Antonio Marinelli
Keyword(s):  
Gamma Rays ◽  
High Energy ◽  
High Energy Neutrinos

ON THE PRODUCTION OF HIGH-ENERGY NEUTRINOS IN GAMMA-RAY BURSTS

2014 ◽  
Vol 28 ◽  
pp. 1460207
Author(s):  
MATIAS M. REYNOSO
Keyword(s):  
Energy Loss ◽  
Gamma Ray ◽  
Neutrino Flux ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Proton Proton ◽  
Preliminary Results ◽  
Acceleration Zone ◽  
High Energy Neutrinos

We present preliminary results of a model with two zones in order to study the production of high energy neutrinos at the prompt phase of gamma-ray bursts (GRB). We consider an acceleration zone, where protons and electrons are injected and accelerated, being subject to synchrotron, proton-proton, and proton-gamma cooling. We also assume that they can escape from this zone at a certain rate. The produced pions and the decaying muons are also subject to energy loss and gain processes within the acceleration zone, and the escaping ones are re-injected in a second zone where acceleration no longer operates. We compute the neutrino output expected from both of these zones using typical GRB parameters, and integrate in the redshift to obtain a diffuse neutrino flux which can be different from the expected within one-zone models.

scholarly journals H.E.S.S. searches for TeV gamma-rays associated to high-energy neutrinos

2019 ◽  
Author(s):  
Fabian Schüssler ◽  
H. Ashkar ◽  
M. Backes ◽  
Kathrin Egberts ◽  
F. Brun ◽  
...  
Keyword(s):  
Gamma Rays ◽  
High Energy ◽  
High Energy Neutrinos ◽  
Tev Gamma Rays

HIGH ENERGY NEUTRINOS FROM ACCELERATORS OF COSMIC RAY NUCLEI

2008 ◽  
Vol 17 (09) ◽  
pp. 1401-1409
Author(s):  
ANDREW M. TAYLOR
Keyword(s):  
Active Galactic Nuclei ◽  
Gamma Ray ◽  
Neutrino Flux ◽  
Galactic Nuclei ◽  
Cosmic Ray ◽  
High Energy ◽  
Air Shower ◽  
Radiation Fields ◽  
High Energy Neutrinos ◽  
Neutrino Fluxes

Ongoing experimental efforts to detect cosmic sources of high energy neutrinos are guided by the expectation that astrophysical accelerators of cosmic ray protons also generate high energy neutrinos through their interactions with ambient matter and/or photons. However the predicted neutrino flux is reduced if cosmic ray sources accelerate not only protons but also a significant number of heavier nuclei, as is indicated by recent air shower data. I consider two plausible extragalactic class of sources, active galactic nuclei and gamma-ray bursts, and demand consistency with the observed cosmic ray composition and energy spectrum at Earth after allowing for propagation through intergalactic radiation fields. This allows me to calculate the degree of photo-disintegration and pion production expected to occur in these sources, and hence the neutrino fluxes from them.

scholarly journals EeV astrophysical neutrinos from flat spectrum radio quasars

2020 ◽  
Vol 642 ◽  
pp. A92 ◽  
Author(s):  
C. Righi ◽  
A. Palladino ◽  
F. Tavecchio ◽  
F. Vissani
Keyword(s):  
Neutrino Flux ◽  
High Energy ◽  
External Radiation ◽  
Supermassive Black Hole ◽  
Neutrino Spectrum ◽  
Radiation Fields ◽  
Spectrum Radio ◽  
Astrophysical Neutrinos ◽  
Free Parameters ◽  
High Energy Neutrinos

Context. Flat-spectrum radio quasars (FSRQs) are the most powerful blazars in the γ-ray band. Although they are supposed to be good candidates in producing high-energy neutrinos, no secure detection of FSRQs has been obtained to date, except for a possible case of PKS B1424-418. Aims. In this work, our aim was to compute the expected flux of high-energy neutrinos from FSRQs using standard assumptions for the properties of the radiation fields filling the regions surrounding the central supermassive black hole. Methods. Starting from the FSRQ spectral sequence, we computed the neutrino spectrum assuming interaction of relativistic protons with internal and external radiation fields. We studied the neutrino spectra resulting from different values of free parameters Results. The result we obtained is that high-energy neutrinos are naturally expected from FSRQs in the sub-EeV–EeV energy range and not at PeV energies. This justifies the non-observation of neutrinos from FSRQs with the present technology, since only neutrinos below 10 PeV have been observed. We found that for a non-negligible range of the parameters, the cumulative flux from FSRQs is comparable to or even exceeds the expected cosmogenic neutrino flux. This result is intriguing and highlights the importance of disentangling these point-source emissions from the diffuse cosmogenic background.

scholarly journals Constraining the fraction of core-collapse supernovae harbouring choked jets with high-energy neutrinos

2020 ◽  
Vol 492 (1) ◽  
pp. 843-847
Author(s):  
Dafne Guetta ◽  
Roi Rahin ◽  
Imre Bartos ◽  
Massimo Della Valle
Keyword(s):  
Black Hole ◽  
Gamma Ray ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Core Collapse ◽  
Stellar Envelope ◽  
Jet Production ◽  
Stellar Core ◽  
High Fraction ◽  
High Energy Neutrinos

ABSTRACT The joint observation of core-collapse supernovae with gamma-ray bursts shows that jets can be launched in the aftermath of stellar core collapse, likely by a newly formed black hole that accretes matter from the star. Such gamma-ray bursts have only been observed accompanying Type Ibc supernovae, indicating a stellar progenitor that lost its hydrogen envelope before collapse. According to recent hypothesis, it is possible that jets are launched in core-collapse events even when the progenitors still retain their hydrogen envelopes; however, such jets are not able to burrow through the star and will be stalled into the interior of the progenitor star before escaping. These jets are called choked jets. High-energy neutrinos produced by such choked jets could escape the stellar envelope and could be observed. Here, we examine how multimessenger searches for high-energy neutrinos and core-collapse supernovae can detect or limit the fraction of stellar collapses that produce jets. We find that a high fraction of jet production is already limited by previous observational campaigns. We explore possibilities with future observations using Large Synoptic Survey Telescope, IceCube, and Km3NET.

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