scholarly journals The High-Energy Spectra of Accreting Black Holes: Observational Evidence for Bulk-Motion Infall

1998 ◽  
Vol 499 (1) ◽  
pp. L31-L35 ◽  
Author(s):  
Chris Shrader ◽  
Lev Titarchuk
Keyword(s):  
Black Holes ◽  
High Energy ◽  
Observational Evidence ◽  
Energy Spectra ◽  
Bulk Motion

scholarly journals Planck Neutrinos as Ultra High Energy Cosmic Rays

2020 ◽  
Vol 29 (1) ◽  
pp. 40-46
Author(s):  
Dmitri L. Khokhlov
Keyword(s):  
Black Holes ◽  
Cosmic Rays ◽  
Standard Model ◽  
Active Galactic Nuclei ◽  
Planck Scale ◽  
Galactic Nuclei ◽  
High Energy ◽  
Ultra High Energy ◽  
High Energy Cosmic Rays ◽  
The Standard Model

AbstractThe studied conjecture is that ultra high energy cosmic rays (UHECRs) are hypothetical Planck neutrinos arising in the decay of the protons falling onto the gravastar. The proton is assumed to decay at the Planck scale into positron and four Planck neutrinos. The supermassive black holes inside active galactic nuclei, while interpreted as gravastars, are considered as UHECR sources. The scattering of the Planck neutrinos by the proton at the Planck scale is considered. The Planck neutrinos contribution to the CR events may explain the CR spectrum from 5 × 1018 eV to 1020 eV. The muon number in the Planck neutrinos-initiated shower is estimated to be larger by a factor of 3/2 in comparison with the standard model that is consistent with the observational data.

scholarly journals PHEMTO: the polarimetric high energy modular telescope observatory

2021 ◽  
Author(s):  
P. Laurent ◽  
F. Acero ◽  
V. Beckmann ◽  
S. Brandt ◽  
F. Cangemi ◽  
...  
Keyword(s):  
Black Holes ◽  
Energy Range ◽  
High Performance ◽  
Angular Resolution ◽  
High Energy ◽  
Thermal Processes ◽  
Scientific Performance ◽  
X Ray ◽  
Measurement Capability ◽  
Better Than

AbstractBased upon dual focusing techniques, the Polarimetric High-Energy Modular Telescope Observatory (PHEMTO) is designed to have performance several orders of magnitude better than the present hard X-ray instruments, in the 1–600 keV energy range. This, together with its angular resolution of around one arcsecond, and its sensitive polarimetry measurement capability, will give PHEMTO the improvements in scientific performance needed for a mission in the 2050 era in order to study AGN, galactic black holes, neutrons stars, and supernovae. In addition, its high performance will enable the study of the non-thermal processes in galaxy clusters with an unprecedented accuracy.

scholarly journals High energy collisions of black holes numerically revisited

2016 ◽  
Vol 94 (10) ◽  
Author(s):  
James Healy ◽  
Ian Ruchlin ◽  
Carlos O. Lousto ◽  
Yosef Zlochower
Keyword(s):  
Black Holes ◽  
High Energy ◽  
High Energy Collisions

AGN and the necessity of feedback

2005 ◽  
Vol 363 (1828) ◽  
pp. 695-704 ◽  
Author(s):  
Andrew J. Benson
Keyword(s):  
Black Holes ◽  
Star Formation ◽  
Galaxy Formation ◽  
Supermassive Black Holes ◽  
Observational Evidence ◽  
Theoretical Studies ◽  
Feedback Process ◽  
Low Mass

There is now good observational evidence that some type of feedback process must operate within galaxies. Such a process has long been thought to exist on the basis of theoretical studies of galaxy formation. This feedback is responsible for regulating the rate of star formation and thereby preventing the formation of an overabundance of low–mass galaxies. There is gathering evidence that this feedback process must somehow involve the supermassive black holes thought to dwell in the centres of galaxies.

INVESTIGATION ON THE NEUTRINO INDUCED MUONS FROM ACTIVE GALACTIC NUCLEI

2000 ◽  
Vol 15 (25) ◽  
pp. 1567-1576
Author(s):  
NAYANTARA GUPTA ◽  
D. P. BHATTACHARYYA
Keyword(s):  
Cross Sections ◽  
Neutrino Flux ◽  
High Energy ◽  
Energy Spectra ◽  
Muon Energy ◽  
Model Calculations ◽  
Charge Current ◽  
Upper Limits ◽  
Total Interaction ◽  
Interaction Cross Sections

The fluxes of neutrino induced muons at different zenith angles have been calculated using the high energy diffused neutrino spectra emitted from blazars. We have used the standard formulation developed by Gaisser based on charge-current interactions in rock and the QED-based energy loss formulation to estimate the spectra of neutrino induced muons. The energy spectra of neutrino flux generated from blazars has been taken from the model calculations of Protheroe. The latest charge-current and total interaction cross-sections at ultrahigh energies from Kwiecinski et al. have been used to find the probability of muon generation from neutrinos and the loss of neutrinos during propagation through the Earth. We find that our derived horizontal neutrino induced muon energy spectra expected from blazar model of Protheroe is comparable with the upper limits as predicted by SOUDAN 2 experiment.

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