364 citations
- P. Jakobsson2 profiles17 · h 57
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- University of CopenhagenDK25 papers
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- National Center for Theoretical SciencesTW10 papers
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20 papers · 1 filter
Fermi Large Area Telescope observations of Local Group galaxies: Detection of M31 and search for M33
LAT collaboration
Cosmic rays (CRs) can be studied through the galaxy-wide gamma-ray emission that they generate when propagating in the interstellar medium. The comparison of the diffuse signals fr…
Locally-finite connected-homogeneous digraphs
Robert Gray, Rognvaldur G. Moller
A digraph is connected-homogeneous if any isomorphism between finite connected induced subdigraphs extends to an automorphism of the digraph. We consider locally-finite connected-h…
Probing GRB environments with time variability: ULTRASPEC fast imaging of GRB 080210
A. De Cia, P. Jakobsson, G. Björnsson +12
We present high time resolution (1.09 s) photometry of GRB 080210 obtained with ULTRASPEC mounted on the ESO/3.6-m telescope, starting 68.22 min after the burst and lasting for 26.…
A High Signal-to-Noise Ratio Composite Spectrum of Gamma-ray Burst Afterglows
L. Christensen, J. P. U. Fynbo, J. X. Prochaska +3
We present a composite spectrum of 60 long duration gamma-ray burst (GRB) afterglows with redshifts in the range 0.35<z<6.7 observed with low resolution optical spectra. The compos…
Gamma-ray flares from the Crab Nebula
LAT Collaboration
A young and energetic pulsar powers the well-known Crab Nebula. Here we describe two separate gamma-ray (photon energy >100 MeV) flares from this source detected by the Large Area…
Stimulated emission of terahertz radiation by semiconductor microcavities
K. V. Kavokin, M. A. Kaliteevski, R. A. Abram +3
We show that planar semiconductor microcavities in the strong coupling regime can be used as sources of stimulated terahertz (THz) radiation. Emitted THz photons would have a frequ…