A REVIEW OF PARTICLE ASTROPHYSICS WITH ICECUBE

2012 ◽  
Vol 27 (39) ◽  
pp. 1230042 ◽  
Author(s):  
IGNACIO TABOADA
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Point Sources ◽  
Cherenkov Light ◽  
Atmospheric Neutrinos ◽  
Neutrino Detector ◽  
Secondary Particles ◽  
Particle Astrophysics

IceCube is a neutrino detector sensitive to energies above 10 GeV. IceCube operates by sensing the Cherenkov light from secondary particles produced in neutrino-matter interactions. One gigaton of highly transparent Antarctic ice is instrumented to achieve this goal. Designed to be modular, IceCube has been collecting data since construction began in 2005. Construction was completed in December 2010. The primary goal of IceCube is to observe astrophysical sources of neutrinos. We present here a summary of IceCube's recent results in atmospheric neutrinos, point sources, diffuse fluxes of neutrinos, cosmogenic neutrinos, a lack of correlation between neutrinos and Gamma Ray Bursts and the search for dark matter.

scholarly journals The response of an autonomous underwater telescope to high energy neutrinos for the observation of Gamma-ray bursts (GRBs)

2019 ◽  
Vol 22 ◽  
pp. 88
Author(s):  
K. Balasi ◽  
C. Markou ◽  
K. Tzamarioudaki ◽  
P. Rapidis ◽  
E. Drakopoulou ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Simulation Program ◽  
Neutrino Detector ◽  
High Energies ◽  
Analytical Studies ◽  
High Energy Neutrinos ◽  
Detector Simulation ◽  
Fast Detector

The response of an underwater neutrino detector is discussed for investigating its performance to the detection of muons and high energy neutrinos. The afformentioned telescope consists of an autonomous battery operated detector string to a central 4-floor tower. In this aim, we utilised a fast detector simulation program, SIRENE, to simulate the hits from Cherenkov photons at ultra high energies (as high as 1020 eV). In order to optimize the detector, analytical studies for different configurations and characteristics of the photo-multiplier tubes inside the optical modules of the telescope was also examined.

scholarly journals Gamma-Ray Sensitivity to Dark Matter Subhalo Modelling at High Latitudes

Galaxies ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 90 ◽  
Author(s):  
Francesca Calore ◽  
Moritz Hütten ◽  
Martin Stref
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Detection Threshold ◽  
Point Sources ◽  
Large Set ◽  
Case Scenario ◽  
Tidal Disruption ◽  
Dwarf Spheroidal Galaxies ◽  
Dark Matter Mass ◽  
The One

Searches for “dark” subhaloes in gamma-ray point-like source catalogues are among promising strategies for indirect dark matter detection. Such a search is nevertheless affected by uncertainties related, on the one hand, to the modelling of the dark matter subhalo distribution in Milky-Way-like galaxies, and, on the other hand, to the sensitivity of gamma-ray instruments to the dark matter subhalo signals. In the present work, we assess the detectability of dark matter subhaloes in Fermi-LAT catalogues, taking into accounts uncertainties associated with the modelling of the galactic subhalo population. We use four different halo models bracketing a large set of uncertainties. For each model, adopting an accurate detection threshold of the LAT to dark matter subhalo signals and comparing model predictions with the number of unassociated point-sources in Fermi-LAT catalogues, we derive upper limits on the annihilation cross section as a function of dark matter mass. Our results show that, even in the best-case scenario (i.e., DMonly subhalo model), which does not include tidal disruption from baryons, the limits on the dark matter parameter space are less stringent than current gamma-ray limits from dwarf spheroidal galaxies. Comparing the results obtained with the different subhalo models, we find that baryonic effects on the subhalo population are significant and lead to dark matter constraints that are less stringent by a factor of ∼2 to ∼5. This uncertainty comes from the unknown resilience of dark matter subhaloes to tidal disruption.

On the gamma-ray signals from UCMH/mini-spike accompanying the DAMPE 1.4 TeV e+e− excess

2020 ◽  
Vol 497 (2) ◽  
pp. 2486-2492
Author(s):  
Ji-Gui Cheng ◽  
Shang Li ◽  
Ying-Ying Gan ◽  
Yun-Feng Liang ◽  
Rui-Jing Lu ◽  
...  
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Point Sources ◽  
Statistical Fluctuation

ABSTRACT The tentative 1.4 TeV e+e− excess observed by DAMPE, if not a statistical fluctuation, may be explained by dark matter (DM) annihilation within a nearby subhalo with a distance of <0.3 kpc. The process of DM annihilating to e+e− is accompanied by the production of gamma-ray photons, which could lead to detectable signals of Fermi-LAT. In this work, we focus on the model that the tentative 1.4 TeV signal is from a nearby ultracompact mini halo (UCMH). Due to the small angular extension, the counterpart gamma-ray signal would be hidden among Fermi-LAT unassociated point sources. We examine the point sources in 4FGL systematically by analyzing the Fermi-LAT data, aiming to investigate whether there exist sources with gamma-ray properties consistent with the UCMH model of the 1.4 TeV excess. We find more than 10 sources could be the candidates. Furthermore, we test the possibility that the excess signal is from a DM mini-spike around the nearest BH, but our result does not favour such a scenario.

scholarly journals Strong lensing of gamma ray bursts as a probe of compact dark matter

2018 ◽  
Vol 98 (12) ◽  
Author(s):  
Lingyuan Ji ◽  
Ely D. Kovetz ◽  
Marc Kamionkowski
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Strong Lensing

Searching gamma-ray bursts for gravitational lensing echoes - Implications for compact dark matter

1993 ◽  
Vol 414 ◽  
pp. 36 ◽  
Author(s):  
R. J. Nemiroff ◽  
J. P. Norris ◽  
W. A. D. T. Wickramasinghe ◽  
J. M. Horack ◽  
C. Kouveliotou ◽  
...  
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Gamma Ray ◽  
Gamma Ray Bursts

scholarly journals GRB ASTROPHYSICS IN THE SWIFT ERA AND BEYOND

2009 ◽  
Vol 18 (10) ◽  
pp. 1567-1570
Author(s):  
MICHAEL STAMATIKOS
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Electromagnetic Spectrum ◽  
The Novel ◽  
Fundamental Physics ◽  
High Energy Radiation ◽  
Discovery Potential ◽  
Particle Astrophysics ◽  
Scientific Theme

Gamma-ray Bursts (GRBs) are relativistic cosmological beacons of transient high energy radiation whose afterglows span the electromagnetic spectrum. Theoretical expectations of correlated neutrino emission position GRBs at an astrophysical nexus for a metamorphosis in our understanding of the Cosmos. This new dawn in the era of experimental (particle) astrophysics and cosmology is afforded by current facilities enabling the novel astronomy of high energy neutrinos, in concert with unprecedented electromagnetic coverage. In that regard, GRBs represent a compelling scientific theme that may facilitate fundamental breakthroughs in the context of Swift, Fermi and IceCube. Scientific synergy will be achieved by leveraging the combined sensitivity of contemporaneous ground-based and satellite observatories, thus optimizing their collective discovery potential. Hence, the advent of GRB multi-messenger astronomy may cement an explicit connection to fundamental physics, via nascent cosmic windows, throughout the next decade.

scholarly journals The ALEXIS Point Source Detection Effort

1996 ◽  
Vol 152 ◽  
pp. 485-489
Author(s):  
Diane Roussel-Dupré ◽  
Jeff Bloch ◽  
Sean Ryan ◽  
Bradley Edwards ◽  
Timothy Pfafman ◽  
...  
Keyword(s):  
Point Source ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Point Sources ◽  
Cataclysmic Variable ◽  
Spacecraft Attitude ◽  
Source Detection ◽  
Euv Emission ◽  
New Methods ◽  
Better Than

Los Alamos National Laboratory’s ALEXIS satellite (a wide area EUV monitoring instrument) was launched April 25, 1993. Due to the damage sustained at launch by the satellite, the ALEXIS project team has had to spend over a year devising new methods to determine spacecraft attitude knowledge, essential for putting photons back on the sky correctly. These efforts have been successful and currently the ALEXIS attitude solutions are precise to better than 0.5 degree close to the original 0.25 degree pre-flight specification. This paper will discuss the number and types of point sources that have been revealed in the ALEXIS data to date. We will also discuss ALEXIS observations of the June, 1994 super outburst of the Cataclysmic Variable VW Hyi, a program to look for simultaneous EUV emission from Gamma Ray Bursts, as well as an effort to detect EUV transients with a 12 – 24 hour response time.

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