scholarly journals ULTRAHIGH ENERGY TAU NEUTRINOS

2005 ◽  
Vol 20 (19) ◽  
pp. 4656-4663 ◽  
Author(s):  
J. JONES ◽  
I. MOCIOIU ◽  
I. SARCEVIC ◽  
M. H. RENO
Keyword(s):  
Energy Loss ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
The Other ◽  
Ultrahigh Energy ◽  
Tau Neutrino ◽  
Tau Neutrinos ◽  
The Earth ◽  
Astrophysical Neutrinos ◽  
Neutrino Fluxes

We study ultrahigh energy astrophysical neutrinos and the contribution of tau neutrinos from neutrino oscillations, relative to the contribution of the other flavors. We show the effect of tau neutrino regeneration and tau energy loss as they propagate through the Earth. We consider a variety of neutrino fluxes, such as cosmogenic neutrinos and neutrinos that originate in Active Galactic Nuclei. We discuss signals of tau neutrinos in detectors such as IceCube, RICE and ANITA.

scholarly journals TRACING VERY HIGH ENERGY TAU NEUTRINOS FROM COSMOLOGICAL SOURCES IN ICE

2005 ◽  
Vol 20 (06) ◽  
pp. 1204-1211 ◽  
Author(s):  
J. JONES ◽  
I. MOCIOIU ◽  
I. SARCEVIC ◽  
M. H. RENO
Keyword(s):  
High Energy ◽  
Ultrahigh Energy ◽  
Tau Neutrino ◽  
Tau Neutrinos ◽  
The Earth ◽  
Very High Energy ◽  
Charged Leptons ◽  
Neutrino Fluxes ◽  
In Transit ◽  
Very High

Astrophysical sources of ultrahigh energy neutrinos yield tau neutrino fluxes due to neutrino oscillations. We study in detail the contribution of tau neutrinos with energies above 106 GeV relative to the contribution of the other flavors. We consider several different initial neutrino fluxes and include tau neutrino regeneration in transit through the Earth and energy loss of charged leptons. We discuss signals of tau neutrinos in detectors such as IceCube, RICE and ANITA.

WHAT DO WE MEAN BY DETECTING EARTH-SKIMMING NEUTRINOS?

2004 ◽  
Vol 19 (13n16) ◽  
pp. 1125-1132
Author(s):  
GUEY-LIN LIN
Keyword(s):  
Neutrino Flux ◽  
Tau Lepton ◽  
Tau Neutrino ◽  
Flavor Oscillations ◽  
Tau Neutrinos ◽  
Detection Strategy ◽  
The Earth ◽  
Neutrino Flavor ◽  
Neutrino Fluxes

In this talk, we elaborate the strategy for detecting the Earth-skimming tau neutrinos. We first show that there are non-negligible astrophysical tau neutrino fluxes due to neutrino flavor oscillations. We then illustrate the idea of detecting Earth-skimming tau neutrinos. In particular, we point out that the tau-lepton flux resulting from neutrino-nucleon scatterings inside the earth is controlled by the tau-lepton range. We demonstrate this observation by showing the tau-lepton flux induced by the GZK tau-neutrino flux. The question on the energy resolutions of tau neutrinos in this detection strategy is briefly discussed.

scholarly journals Co-existence of two plasma phases in solar and AGN coronas

1998 ◽  
pp. 43-53
Author(s):  
A. Kubicela ◽  
J. Arsenijevic ◽  
L.C. Popovic ◽  
N. Trajkovic ◽  
E. Bon
Keyword(s):  
Solar Corona ◽  
Active Galactic Nuclei ◽  
Research Work ◽  
Neutral Hydrogen ◽  
Galactic Nuclei ◽  
Theoretical Explanation ◽  
The Other ◽  
Solar Photosphere ◽  
Hydrogen Lines ◽  
Hot Corona

Here we have juxtaposed two distant cosmic locations of the Sun and AGN where neutral hydrogen appears in a close connection with hot coronas. Besides the solar photosphere, chromosphere and prominences where the presence of neutral hydrogen is well established, its emission quite high in hot solar corona is still puzzling. Some of earlier observations where H? emission in solar corona was detected in eclipse and in daily coronagraphic observations are reviewed. A proper theoretical explanation of this cold chromospheric-type emission in the hot corona does not exist yet. On the other side, a similar emission of hydrogen lines is present in Active Galactic Nuclei (AGNs). Much research work is currently being done in this field. We outline some of the concepts of the AGN structure prevailing in the astrophysics today.

scholarly journals Multifrequency Variability of AGN's: Continuum Variations from the Near IR to the X-rays

1994 ◽  
Vol 159 ◽  
pp. 131-143
Author(s):  
J. Clavel
Keyword(s):  
Active Galactic Nuclei ◽  
Temporal Evolution ◽  
Line Emission ◽  
Galactic Nuclei ◽  
The Other ◽  
X Rays ◽  
Optical Telescope ◽  
Emission Process ◽  
Near Ir ◽  
The Continuum

Because they emit copiously over more than 10 decades in frequency, Active Galactic Nuclei (AGN) cannot be understood without the help of multiwavelength observations. On the other hand, variability monitoring has also proven to be invaluable in understanding the continuum and line emission process as well as the geometry of the innermost regions in these objects. Indeed, at the heart of AGN's lies an object which is so compact that the only way to probe its structure is the study of the temporal evolution of its spectrum. The equivalent resolution which can be achieved in this way is of the order of 10 microarcsecs, far beyond the capability of any UV or optical telescope.

High energy neutrino sources

1994 ◽  
Vol 346 (1678) ◽  
pp. 93-98 ◽  
Keyword(s):  
Active Galactic Nuclei ◽  
Galaxy Evolution ◽  
Cosmic Strings ◽  
Galactic Nuclei ◽  
High Energy ◽  
Big Bang ◽  
The Past ◽  
The Earth ◽  
The Big Bang ◽  
Bright Phase

High energy cosmic neutrinos can be produced by protons and nuclei accelerated in cosmic sources (‘acceleration neutrinos) as well as by relic Big Bang particles, cosmic strings, etc. (neutrinos of non-acceleration origin). The most promising ‘acceleration’ sources of neutrinos are supernovae in our Galaxy and active galactic nuclei (AGN). Detectable diffuse fluxes of ‘ acceleration ’ neutrinos can be produced by AGN and during the ‘bright phase’ of galaxy evolution. During the past few years it has been realized that the detectable flux of high energy neutrinos can be also produced by the relic Big Bang particles. The possible sources are annihilation of the neutralinos accumulated inside the Earth and the Sun, decay of neutralinos (due to the weak breaking of R-parity), and the decay of exotic long-lived particles from the Big Bang.

scholarly journals Light Echoes

2011 ◽  
Vol 7 (S285) ◽  
pp. 215-220
Author(s):  
Howard E. Bond ◽  
Misty C. Bentz ◽  
Geoffrey C. Clayton ◽  
Armin Rest
Keyword(s):  
Active Galactic Nuclei ◽  
Milky Way ◽  
Scattered Light ◽  
Galactic Nuclei ◽  
Large Magellanic Cloud ◽  
Reverberation Mapping ◽  
The Earth ◽  
Direct Light ◽  
Light Echoes ◽  
Light And Shadow

AbstractThe first “light echo”—scattered light from a stellar outburst arriving at the Earth months or years after the direct light from the event—was detected more than 100 years ago, around Nova Persei 1901. Renewed interest in light echoes has come from the spectacular echo around V838 Monocerotis, and from discoveries of light echoes from historical and prehistorical supernovæ in the Milky Way and Large Magellanic Cloud as well as from the 19th-century Great Eruption of η Carinae. A related technique is reverberation mapping of active galactic nuclei. This report of a workshop on Light Echoes gives an introduction to light echoes, and summarizes presentations on discoveries of light echoes from historical and prehistorical events, light and shadow echoes around R CrB stars, and reverberation mapping.

Sign in / Sign up

Export Citation Format

Share Document