Zobrazeno 1 - 10
of 64
pro vyhledávání: '"BECKER, JULIA K."'
Low Luminosity Active Galactic Nuclei (LLAGNs) possess the characteristic features of more luminous Active Galactic Nuclei (AGNs) but exhibit a much lower nuclear Halpha luminosity than their more luminous counterparts. M87 (NGC 4486) and Centaurus A
Externí odkaz:
http://arxiv.org/abs/1103.5552
Autor:
Biermann, Peter L., Becker, Julia K., Dreyer, Jens, Meli, Athina, Seo, Eun-Suk, Stanev, Todor
Publikováno v:
Astrophys.J.725:184-187,2010
One prediction of particle acceleration in the supernova remnants in the magnetic wind of exploding Wolf Rayet and Red Super Giant stars is that the final spectrum is a composition of a spectrum $E^{-7/3}$ and a polar cap component of $E^{-2}$ at the
Externí odkaz:
http://arxiv.org/abs/1009.5592
Gamma-ray bursts have the potential to produce the particle energies (up to $10^{21}$\,eV) and the energy budget ($10^{44}\, \rm{erg\, yr^{-1}\, Mpc^{-3}}$) to accommodate the spectrum of the highest energy cosmic rays; on the other hand, there is no
Externí odkaz:
http://arxiv.org/abs/1003.4710
Autor:
Biermann, Peter L., Becker, Julia K., Caceres, Gabriel, Meli, Athina, Seo, Eun-Suk, Stanev, Todor
One important prediction of acceleration of particles in the supernova caused shock in the magnetic wind of exploding Wolf Rayet and Red Super Giant stars is the production of an energetic particle component with an E^-2 spectrum, at a level of a few
Externí odkaz:
http://arxiv.org/abs/0910.1197
As starburst galaxies show a star formation rate up to several hundred times larger than the one in a typical galaxy, the expected supernova rate is higher than average. This in turn implies a high rate of long gamma ray bursts (GRBs), which are extr
Externí odkaz:
http://arxiv.org/abs/0909.0158
The high-peaked BL Lac object Pks2155-304 shows high variability at multiwavelengths, i.e. from optical up to TeV energies. A giant flare of around 1 hour at X-ray and TeV energies was observed in 2006. In this context, it is essential to understand
Externí odkaz:
http://arxiv.org/abs/0907.4284
In the mass range of 1e15 g up to 1e26 g, primordial black holes (PBHs) as a possible contribution to the dark matter are still unexplored. In this contribution, we investigate the possibility of an electromagnetic signal from PBH interactions with a
Externí odkaz:
http://arxiv.org/abs/0905.3078
We propose an explanation for the far-infrared/radio correlation of galaxies in terms of the energy balance of the interstellar medium and determine the flux from high-energy photons and neutrinos from starburst galaxies. We present a catalog of the
Externí odkaz:
http://arxiv.org/abs/0901.1775
Autor:
Becker, Julia K.
Publikováno v:
J.Phys.Conf.Ser.136:022055,2008
Astrophysical neutrinos can be produced in proton interactions of charged cosmic rays with ambient photon or baryonic fields. Cosmic rays are observed in balloon, satellite and air shower experiments every day, from below 1e9 eV up to macroscopic ene
Externí odkaz:
http://arxiv.org/abs/0811.0696
Autor:
Abramowicz, Marek A., Becker, Julia K., Biermann, Peter L., Garzilli, Antonella, Johansson, Fredrik, Qian, Lei
Publikováno v:
Astrophys.J.705:659-669,2009
It was suggested by several authors that hypothetical primordial black holes (PBHs) may contribute to the dark matter in our Galaxy. There are strong constraints based on the Hawking evaporation that practically exclude PBHs with masses m~1e15-1e16g
Externí odkaz:
http://arxiv.org/abs/0810.3140