76 citations · 154 across the 8 of their papers we have counts for
9 papers
The initial evolution of SN 2011dh: The importance of inhomogeneities
Claes-Ingvar Bjornsson
SN 2011dh is rather unique in that it offered detailed observations of the initial phase in the radio as well as optical regimes. This makes possible a comparison between models us…
The initial evolution of SN 1993J: Piston phase versus standard model
C. -I. Bjornsson
The evolution of SN 1993J is unlikely to be self-similar. Spatially resolved VLBI-observations show that the velocity of the outer rim of the radio emission region brakes at a few…
Atacama Compact Array Observations of the Pulsar-Wind Nebula of SNR 0540-69.3
P. Lundqvist, N. Lundqvist, C. Vlahakis +6
We present observations of the pulsar-wind nebula (PWN) region ofSNR 0540-69.3. The observations were made with the Atacama Compact Array (ACA) in Bands 4 and 6. We also add radio…
Circular polarisation from inhomogeneous synchrotron sources
C. -I. Bjornsson
Inhomogeneities can influence the polarisation emerging from a synchrotron source. However, it is shown that the frequency distribution of circular polarisation is only marginally…
The Deepest Radio Observations of Nearby Type IA Supernovae: Constraining Progenitor Types and Optimizing Future Surveys
Peter Lundqvist, Esha Kundu, Miguel A. Perez-Torres +7
We report deep radio observations of nearby Type Ia Supernovae (SNe Ia) with the electronic Multi-Element Radio Linked Interferometer Net-work (e-MERLIN), and the Australia Telesco…
Circular polarisation in compact radio sources: Constraints on particle acceleration and electron-positron pairs
Claes-I. Bjornsson
It is shown that the frequency distribution of the degree of circular polarisation for a homogeneous source is sensitive to the properties of the synchrotron emitting plasma. Most…
Statistical analysis of BATSE gamma-ray bursts: Self-similarity and the Amati-relation
L. Borgonovo, C. -I. Bjornsson
The statistical properties of a complete, flux limited sample of 197 long gamma--ray bursts (GRBs) detected by BATSE are studied. In order to bring forth their main characteristics…
The X-ray and radio emission from SN 2002ap: The importance of Compton scattering
C. -I. Bjornsson, C. Fransson
The radio and X-ray observations of the Type Ic supernova SN 2002ap are modeled. We find that inverse Compton cooling by photospheric photons explains the observed steep radio spec…
Compton cooling in the afterglow of gamma-ray bursts: Application to GRB 980923 and GRB 971214
C. -I. Bjornsson
The role of Compton cooling in the standard model for the afterglows of gamma-ray bursts is considered. When electrons cool by scattering off their own synchrotron photons, three c…