7,252 research outputs found
The Dawn of Multi-Messenger Astronomy
The recent discoveries of high-energy astrophysical neutrinos and
gravitational waves have opened new windows of exploration to the Universe.
Combining neutrino observations with measurements of electromagnetic radiation
and cosmic rays promises to unveil the sources responsible for the neutrino
emission and to help solve long-standing problems in astrophysics such as the
origin of cosmic rays. Neutrino observations may also help localize
gravitational-wave sources, and enable the study of their astrophysical
progenitors. In this work we review the current status and future plans for
multi-messenger searches of neutrino sources.Comment: To appear in "Neutrino Astronomy- Current status, future prospects",
Eds. T. Gaisser & A. Karle (World Scientific
The exceptional TeV flaring activity of the blazar 1ES 1959+650 in 2015 and 2016 as observed with VERITAS
The high-synchrotron-peaked blazar 1ES 1959+650 was among the first
extragalactic sources detected in the very high energy gamma ray band (VHE, E >
100 GeV). In October 2015, the source entered an extended period of activity
that continued through July 2016, during which several strong VHE flares were
observed. This flaring activity in the TeV band was accompanied by a strong
increase in the optical, X-ray, and GeV gamma-ray flux of the source,
surpassing its brightest recorded flux states. The VERITAS telescope array
performed observations of 1ES 1959+650 between October 2015 and June 2016, and
detected the source multiple times at a flux higher than the Crab nebula flux
in the TeV band, representing the brightest flares of this object since 2002.
We here present results from the analysis of 32 hours of VERITAS observations
obtained during this period and as well as a contemporaneous multi-wavelength
observations in the optical, X-ray, and GeV gamma-ray bands.Comment: In Proceedings of the International Cosmic Ray Conference 2017,
Busan, South Kore
Reflection formulas for order derivatives of Bessel functions
From new integral representations of the -th derivative of Bessel
functions with respect to the order, we derive some reflection formulas for the
first and second order derivative of and % Y_{\nu
}\left( t\right) for integral order, and for the -th order derivative of
and for arbitrary real
order. As an application of the reflection formulas obtained for the first
order derivative, we extend some formulas given in the literature to negative
integral order. Also, as a by-product, we calculate an integral which does not
seem to be reported in the literature.Comment: arXiv admin note: text overlap with arXiv:1808.0560
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