scholarly journals High-Energy, Short-Duration Bursts of Coherent Terahertz Radiation from an Embedded Plasma Dipole

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Kyu Been Kwon ◽  
Teyoun Kang ◽  
Hyung Seon Song ◽  
Young-Kuk Kim ◽  
Bernhard Ersfeld ◽  
...  
Keyword(s):  
Short Duration ◽  
Terahertz Radiation ◽  
High Energy

scholarly journals High-energy astrophysics and the search for sources of gravitational waves

2018 ◽  
Vol 376 (2120) ◽  
pp. 20170294 ◽  
Author(s):  
P. T. O'Brien ◽  
P. Evans
Keyword(s):  
Gravitational Wave ◽  
Short Duration ◽  
Gamma Ray ◽  
New Technology ◽  
High Energy ◽  
Compact Objects ◽  
Wide Field ◽  
High Energy Radiation ◽  
Energy Radiation ◽  
Binary Mergers

The dawn of the gravitational-wave (GW) era has sparked a greatly renewed interest into possible links between sources of high-energy radiation and GWs. The most luminous high-energy sources—gamma-ray bursts (GRBs)—have long been considered as very likely sources of GWs, particularly from short-duration GRBs, which are thought to originate from the merger of two compact objects such as binary neutron stars and a neutron star–black hole binary. In this paper, we discuss: (i) the high-energy emission from short-duration GRBs; (ii) what other sources of high-energy radiation may be observed from binary mergers; and (iii) how searches for high-energy electromagnetic counterparts to GW events are performed with current space facilities. While current high-energy facilities, such as Swift and Fermi, play a crucial role in the search for electromagnetic counterparts, new space missions will greatly enhance our capabilities for joint observations. We discuss why such facilities, which incorporate new technology that enables very wide-field X-ray imaging, are required if we are to truly exploit the multi-messenger era. This article is part of a discussion meeting issue ‘The promises of gravitational-wave astronomy’.

Spectral and Intensity Control of High Energy Terahertz Radiation from Bulk Liquids

2021 ◽  
Author(s):  
Rakesh Kumar Vaddapally ◽  
Kamalesh Jana ◽  
Indranuj Dey ◽  
Chandra Vardhan Kotyada ◽  
Amit Dattatraya Lad ◽  
...  
Keyword(s):  
Terahertz Radiation ◽  
High Energy ◽  
Intensity Control

scholarly journals Towards an anagraphical picture of high-energy Galactic neutrinos

2019 ◽  
Vol 209 ◽  
pp. 01003
Author(s):  
Antonio Marinelli ◽  
Dario Grasso ◽  
Sofia Ventura
Keyword(s):  
Short Duration ◽  
Molecular Clouds ◽  
Supernova Remnants ◽  
Cosmic Ray ◽  
High Energy ◽  
The Other ◽  
Molecular Gas ◽  
High Energy Neutrino ◽  
Neutrino Telescopes ◽  
Upper Limits

The TeV/PeV neutrino emission from our Galaxy is related to the distribution of cosmic-ray accelerators, their maximal energy of injection as well as the propagation of injected particles and their interaction with molecular gas. In the last years Interesting upper limits on the diffuse hadronic emission from the whole Galaxy, massive molecular clouds and Fermi Bubbles were set by the IceCube and ANTARES as well as HAWC and Fermi-LAT observations. On the other hand no evidence of Galactic point-like excess has been observed up to now by high-energy neutrino telescopes. This result can be related to the short duration of the PeV hadronic activity of the sources responsible for the acceleration of primary protons, possibly including supernova remnants. All these aspects will be discussed in this work.

scholarly journals Spectral properties of gamma-ray bursts observed by the Suzaku wide-band all-sky monitor

2019 ◽  
Vol 71 (4) ◽  
Author(s):  
Norisuke Ohmori ◽  
Kazutaka Yamaoka ◽  
Makoto Yamauchi ◽  
Yuji Urata ◽  
Masanori Ohno ◽  
...  
Keyword(s):  
Short Duration ◽  
Power Law ◽  
Spectral Properties ◽  
Gamma Ray ◽  
Wide Band ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Sky Monitor ◽  
S Peak ◽  
Single Power

Abstract We have systematically studied the spectral properties of 302 localized gamma-ray bursts (GRBs) observed by the Suzaku wide-band all-sky monitor (WAM) from 2005 August to 2010 December. The energy spectra in the 100–5000 keV range integrated over the entire emission and the 1 s peak were fitted by three models: a single power law, a power law with an exponential cutoff (CPL), and the GRB Band function (GRB). Most of the burst spectra were well fitted by a single power law. The average photon index α was −2.11 and −1.73 for long and short bursts, respectively. For the CPL and GRB models, the low-energy and high-energy photon indices (α and β) for the entire emission spectra were consistent with previous measurements. The averages of the α and β were −0.90 and −2.65 for long-duration GRBs, while the average α was −0.55 and the β was not well constrained for short-duration GRBs. However, the average peak energy Epeak was 645 and 1286 keV for long- and short-duration GRBs respectively, which are higher than previous Fermi/GBM measurements (285 keV and 736 keV). The α and Epeak of the 1 s peak spectra were larger, i.e., the spectra were harder, than the total fluence spectra. Spectral simulations based on Fermi-GBM results suggest that the higher Epeaks measured by the Suzaku WAM could be due to detector selection bias, mainly caused by the limited energy range above 100 keV.

scholarly journals Nano-HNS Particles: Mechanochemical Preparation and Properties Investigation

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Chongwei An ◽  
Shuai Xu ◽  
Yuruo Zhang ◽  
Baoyun Ye ◽  
Xiaoheng Geng ◽  
...  
Keyword(s):  
Short Duration ◽  
Three Dimensional ◽  
Specific Area ◽  
High Energy ◽  
Milling Process ◽  
Green Technology ◽  
Impact Sensitivity ◽  
Safety Properties ◽  
Shock Initiation ◽  
Decomposition Properties

Nano-2,2′,4,4′,6,6′-hexanitrostilbene (HNS) particles were successfully prepared by a mechanochemical (i.e., high energy milling) process without an organic solvent, which can be viewed as a green technology. The particle size, morphology, specific area, crystal phase, thermal decomposition properties, impact sensitivity, and short duration shock initiation sensitivity were characterized and tested. The diameter of milling HNS is about 89.2 nm with a narrow size distribution and without agglomeration of particles. The formation mechanism of nano-HNS can be viewed as the transformation from thin HNS sheets with a one-dimensional nanostructure to three-dimensional nanoparticles. The nano-HNS particles present a much higher Ea and lower impact sensitivity than purified HNS, revealing the outstanding safety properties. From the results of the short duration shock initiation sensitivity, 50% and 100% initiation voltages are decreased compared with those of HNS-IV, indicating the higher initiation sensitivity.

scholarly journals A multiwavelength analysis of a collection of short-duration GRBs observed between 2012 and 2015

2019 ◽  
Vol 485 (4) ◽  
pp. 5294-5318 ◽  
Author(s):  
S B Pandey ◽  
Y Hu ◽  
Ao J Castro-Tirado ◽  
A S Pozanenko ◽  
R Sánchez-Ramírez ◽  
...  
Keyword(s):  
Short Duration ◽  
Gamma Ray ◽  
High Energy ◽  
Photometric Data ◽  
Host Galaxy ◽  
Late Time ◽  
Time Data ◽  
Emission Data ◽  
Temporal Decay ◽  
Prompt Emission

Abstract We investigate the prompt emission and the afterglow properties of short-duration gamma-ray burst (sGRB) 130603B and another eight sGRB events during 2012–2015, observed by several multiwavelength facilities including the Gran Canarias Telescope 10.4 m telescope. Prompt emission high energy data of the events were obtained by INTEGRAL-SPI-ACS, Swift-BAT, and Fermi-GBM satellites. The prompt emission data by INTEGRAL in the energy range of 0.1–10 MeV for sGRB 130603B, sGRB 140606A, sGRB 140930B, sGRB 141212A, and sGRB 151228A do not show any signature of the extended emission or precursor activity and their spectral and temporal properties are similar to those seen in case of other short bursts. For sGRB 130603B, our new afterglow photometric data constrain the pre-jet-break temporal decay due to denser temporal coverage. For sGRB 130603B, the afterglow light curve, containing both our new and previously published photometric data is broadly consistent with the ISM afterglow model. Modeling of the host galaxies of sGRB 130603B and sGRB 141212A using the LePHARE software supports a scenario in which the environment of the burst is undergoing moderate star formation activity. From the inclusion of our late-time data for eight other sGRBs we are able to: place tight constraints on the non-detection of the afterglow, host galaxy, or any underlying ‘kilonova’ emission. Our late-time afterglow observations of the sGRB 170817A/GW170817 are also discussed and compared with the sub-set of sGRBs.

Responses of Barnacle Photoreceptors to High Energy Flashes of Short Duration

1978 ◽  
Vol 33 (7-8) ◽  
pp. 600-604
Author(s):  
Christof C. Krischer ◽  
R. D. Dahl ◽  
M. Körfer
Keyword(s):  
Kinetic Model ◽  
Short Duration ◽  
Receptor Potential ◽  
High Energy ◽  
Ringer Solution ◽  
Time Span ◽  
Stable States ◽  
Early Receptor Potential ◽  
Late Receptor Potential ◽  
Light Flashes

Abstract In chromatic adapted barnacle median and lateral photo­receptors the two stable states of the photopigment (rhodopsin R and metarhodopsin M) were interconverted with intense, colored light flashes of 1 ms duration. Only after conversion of the red adapted photoreceptor in K+-Ringer solution with an intense flash the negative early receptor potential, ERP (of R) gradually appeared detected with an indicator flash. For the opposite conversion (blue adapted, R→M) the gradual appearence of the positive ERP (M) was not measurable in the same time span. In artificial seawater all flash stimuli yielded - irrespective of color - the transient component of the late receptor potential (LRP). ERP results for the lateral photoreceptor are dis­cussed in view of an existing kinetic model and an attempt is made to give an explanation which covers the new LRP transient and ERP results for both types of photoreceptor (appendix).

Characterization of short-duration high-energy ball milled WC–Co powders and subsequent consolidations

2014 ◽  
Vol 615 ◽  
pp. S564-S568 ◽  
Author(s):  
Rumman Md Raihanuzzaman ◽  
Tae Sik Jeong ◽  
Reza Ghomashchi ◽  
Zonghan Xie ◽  
Soon-Jik Hong
Keyword(s):  
Short Duration ◽  
High Energy ◽  
Energy Ball

SEARCH FOR STEADY AND TRANSIENT POINT-LIKE SOURCES OF NEUTRINOS WITH ANTARES

2009 ◽  
Vol 18 (10) ◽  
pp. 1505-1509
Author(s):  
◽  
CIRO BIGONGIARI
Keyword(s):  
Short Duration ◽  
Angular Resolution ◽  
Signal To Noise Ratio ◽  
High Energy ◽  
Neutrino Telescope ◽  
Signal To Noise ◽  
Transient Sources ◽  
High Energy Neutrinos ◽  
Noise Ratio ◽  
Better Than

The ANTARES underwater neutrino telescope has been completed in May 2008 and is now taking data continuously. Thanks to its very good angular resolution (better than 0.3° for neutrinos with energy above 10 TeV) ANTARES is especially suited for the search of astrophysical point-like sources of high energy neutrinos. Data taken with a limited detector (5 out of 12 lines) between January and December 2007 have been analyzed to look for a possible neutrino excess from a list of prospective neutrino sources. In the case of transient sources, like GRBs, the short duration of the expected neutrino signal can be exploited to enhance the signal to noise ratio. ANTARES strategy for both steady and transient point-like sources is discussed. The methodology adopted and the results obtained are shown.

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