Results 31 to 40 of about 15,098 (205)

Two-zone model for the broadband Crab nebula spectrum: microscopic interpretation

EPJ Web of Conferences, 2017
We develop a simple two-zone interpretation of the broadband baseline Crab nebula spectrum between 10−5 eV and ~ 100 TeV by using two distinct log-parabola energetic electrons distributions.
Fraschetti F., Pohl M.
doaj   +1 more source

On Possible Reduction of Equilibrium Radius of a Neutron Star Influenced by Superstrong Magnetic Field

Advances in High Energy Physics, Volume 2012, Issue 1, 2012., 2012
Necessary condition for β‐decay suppression of a neutron in degenerate magnetized electron gas is formulated. Based on this, it is shown that, in superstrong magnetic field, equilibrium radius of a neutron star is approximately several times smaller than without the field influence. Therefore, we can make a prediction that in short‐period pulsars, such
Vladimir V. Skobelev, C. Q. Geng
wiley   +1 more source

The Radio - 2 mm Spectral Index of the Crab Nebula Measured with GISMO

, 2011
We present results of 2 mm observations of the Crab Nebula, obtained using the Goddard-IRAM Superconducting 2 Millimeter Observer (GISMO) bolometer camera on the IRAM 30 m telescope.
A. Kovács, A. Sievers, B. S. Mason, Baars, Baars, Bietenholz, Bietenholz, Bietenholz, Bolton, C. A. Jhabvala, D. J. Benford, D. J. Fixsen, Dicker, E. J. Wollack, E. Sharp, Fowler, Greiveldinger, J. G. Staguhn, J. L. Sievers, J. V. George, K. D. Irwin, M. J. Devlin, Macías-Pérez, Mezger, P. M. Korngut, Page, R. G. Arendt, S. F. Maher, S. H. Moseley, S. Navarro, S. R. Dicker, T. M. Miller, Temim, Veron-Cetty, Weiland, Woltjer, Wright   +36 more
core   +1 more source

Pulsar‐Driven Jets in Supernovae, Gamma‐Ray Bursts, and the Universe

Advances in Astronomy, Volume 2012, Issue 1, 2012., 2012
The bipolarity of Supernova 1987A can be understood through its very early light curve from the CTIO 0.4 m telescope and IUE FES and following speckle observations of the “Mystery Spot”. These indicate a beam/jet of light/particles, with initial collimation factors >104 and velocities >0.95 c, involving up to 10−5 M⊙ interacting with circumstellar ...
John Middleditch, Alberto J. Castro-Tirado   +1 more
wiley   +1 more source

The Vela Pulsar and its Synchrotron Nebula

, 2001
(Abridged) We present high-resolution Chandra X-ray observations of PSR B0833-45, the 89 ms pulsar associated with the Vela supernova remnant. We have acquired two observations separated by one month to search for changes in the pulsar and its ...
Alpar A., Arons J., Aschenbach B., Bailes M., Caraveo P. A., D. J. Helfand, DeLuca A., E. V. Gotthelf, Gurkan M. A., J. P. Halpern, Kennel C. F., Leahy D. A., Lu F. J., Lyne A. G., Manchester R. N., Markwardt C. B., Milne D. K., Radhakrishnan V., Rees M. J., Reichley P. E.   +19 more
core   +1 more source

Analysis of Lateral Distribution of Atmospheric Cherenkov Light at High Mountain Altitude Towards Event Reconstruction

International Scholarly Research Notices, Volume 2012, Issue 1, 2012., 2012
Air shower simulations with CORSIKA6.990 code using FLUKA 2011 and QGSJET II hadron generators are performed. The simulations are carried out at high mountain observation level, namely, Chacaltaya cosmic ray station. The lateral distribution of atmospheric Cherenkov light produced by various primary particles, namely, proton, helium, oxygen, and iron ...
Alexander Mishev, S. Alexeyev, L. Marek-Crnjac, O. A. Sampayo, A. S. Tonachini   +4 more
wiley   +1 more source

The Energy Spectrum of TeV Gamma-Rays from the Crab Nebula as measured by the HEGRA system of imaging air Cherenkov telescopes

, 2000
The Crab Nebula has been observed by the HEGRA (High-Energy Gamma-Ray Astronomy) stereoscopic system of imaging air Cherenkov telescopes (IACTs) for a total of about 200 hrs during two observational campaigns: from September 1997 to March 1998 and from ...
A. G. Akhperjanian, A. Heusler, A. Ibarra, A. Kohnle, A. Konopelko, A. Lindner, A. Moralejo, A. Plyasheshnikov, A. Rohring, Aharonian F., Aharonian F., Aharonian F., Aharonian F., Atoyan A. M., B. Wiebel‐Sooth, C. Kohler, C. Wiedner, D. Horns, D. Kranich, D. Schmele, E. Lorenz, F. A. Aharonian, F. Lucarelli, F. Schroder, Frass A., G. Heinzelmann, G. Hermann, G. Puhlhofer, G. Rauterberg, Gillanders G., H. Bojahr, H. J. Volk, H. Kornmeyer, H. Krawczynski, H. Lampeitl, H. Meyer, Hess M., I. Calle, J. A. Barrio, J. C. Gonzalez, J. Cortina, J. Kettler, J. L. Contreras, J. Prahl, K. Bernlohr, L. Padilla, M. Hemberger, M. Kestel, M. Panter, M. Samorski, M. Schilling, M. Tluczykont, M. Willmer, Mahalanobis H. C., N. Gotting, N. Magnussen, O. Mang, Petry D., R. Kankanyan, R. Mirzoyan, R. Plaga, S. Denninghoff, V. Fonseca, V. Sahakian, W. Hofmann, W. Stamm, W. Wittek   +66 more
core   +1 more source

Focusing X‐Ray Optics for Astronomy

X-Ray Optics and Instrumentation, Volume 2010, Issue 1, 2010., 2010
Focusing X‐ray telescopes have been the most important factor in X‐ray astronomy’s ascent to equality with optical and radio astronomy. They are the prime tool for studying thermal emission from very high temperature regions, non‐thermal synchrotron radiation from very high energy particles in magnetic fields and inverse Compton scattering of lower ...
Paul Gorenstein, Stephen L. O′Dell
wiley   +1 more source

The Dark Matter Annihilation Signal from Dwarf Galaxies and Subhalos

Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010
Dark Matter annihilation holds great potential for directly probing the clumpiness of the Galactic halo that is one of the key predictions of the Cold Dark Matter paradigm of hierarchical structure formation. Here we review the γ‐ray signal arising from dark matter annihilation in the centers of Galactic subhalos.
Michael Kuhlen, Andrey V. Kravtsov
wiley   +1 more source

Comparison between the Emission Torus and the Measured Toroidal Magnetic Field for the Crab and Vela Nebulae

The Astrophysical Journal
Polarization measurements provide insight into the magnetic field, a critical aspect of the dynamics and emission properties around the compact object.
Wei Deng, Fei Xie, Kuan Liu, Mingyu Ge, Youli Tuo, Fabio La Monaca, Alessandro Di Marco, En-wei Liang   +7 more
doaj   +1 more source