Results 61 to 70 of about 2,193 (202)

Generation of Cosmic rays in Historical Supernova Remnants

open access: yesEPJ Web of Conferences, 2013
We present the results of observations of two types of Galactic supernova remnants with the SHALON mirror Cherenkov telescope of Tien-Shan high-mountain Observatory: the shell-type supernova remnants Tycho, Cas A and IC 443; plerions Crab Nebula, 3c58 ...
Sinitsyna V.Y., Sinitsyna V.G.
doaj   +1 more source

Searches for Neutrinos from Large High Altitude Air Shower Observatory Ultra-high-energy γ-Ray Sources Using the IceCube Neutrino Observatory

open access: yesThe Astrophysical Journal Letters, 2023
Galactic PeV cosmic-ray accelerators (PeVatrons) are Galactic sources theorized to accelerate cosmic rays up to PeV in energy. The accelerated cosmic rays are expected to interact hadronically with nearby ambient gas or the interstellar medium, resulting
R. Abbasi   +389 more
doaj   +1 more source

The Surprising Crab Nebula

open access: yes, 2013
2012 Fermi Symposium proceedings - eConf ...
Striani, E., Tavani, M., Vittorini, V.
openaire   +2 more sources

THE DUST AND GAS CONTENT OF THE CRAB NEBULA [PDF]

open access: yesThe Astrophysical Journal, 2015
We have constructed MOCASSIN photoionization plus dust radiative transfer models for the Crab Nebula core-collapse supernova (CCSN) remnant, using either smooth or clumped mass distributions, in order to determine the chemical composition and masses of the nebular gas and dust.
P. J. Owen, M. J. Barlow
openaire   +4 more sources

Impact of H.E.S.S. Lidar profiles on Crab Nebula data

open access: yesEPJ Web of Conferences, 2019
The H.E.S.S. experiment in Namibia is a high-energy gamma-ray telescope sensitive in the energy range from 30 GeV to a several tens of TeV, that uses the atmospheric Cherenkov technique to detect showers developed within the atmosphere. The elastic lidar,
Devin Justine   +3 more
doaj   +1 more source

The Electromagnetic Spectrum of the Crab Nebula [PDF]

open access: yesSymposium - International Astronomical Union, 1970
The electromagnetic spectrum of the Crab Nebula has been determined experimentally in the radio, optical, and X-ray regions [1], in which it follows a power law of the type S(v) = Av−α, where S(v) is the power (in watts/m2 sec Hz), A and α are constants, and v is the frequency in Hz. Recent measurements [2–5], however, show a deviation from a power law
openaire   +2 more sources

Modelling the kinked jet of the Crab nebula [PDF]

open access: yesMonthly Notices of the Royal Astronomical Society, 2013
15 pages, 20 ...
A. Mignone   +3 more
openaire   +4 more sources

MAGIC highlights

open access: yesEPJ Web of Conferences, 2016
The present generation of Imaging Air Cherenkov Telescopes (IACTs) has greatly improved our knowledge on the Very High Energy (VHE) side of our Universe. The MAGIC IACTs operate since 2004 with one telescope and since 2009 as a two telescope stereoscopic
López-Coto Rubén
doaj   +1 more source

Abundances in the Crab Nebula

open access: yesThe Astrophysical Journal, 1973
The bright visual-wavelength emission lines in spectra of filaments in the Crab Nebula cannot be used to derive unique values for the relative abundances of elements there, even under a simplifying assumption that heating is due entirely to photoionization by the Crab's nonthermal continuum. However, a range of possibilities may be estimated. By mass,
openaire   +2 more sources

Dissecting the Crab Nebula with JWST: Pulsar Wind, Dusty Filaments, and Ni/Fe Abundance Constraints on the Explosion Mechanism

open access: yesThe Astrophysical Journal Letters
We present JWST observations of the Crab Nebula, the iconic remnant of the historical SN 1054. The observations include NIRCam and MIRI imaging mosaics plus MIRI/MRS spectra that probe two select locations within the ejecta filaments.
Tea Temim   +21 more
doaj   +1 more source

Home - About - Disclaimer - Privacy