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The Deepest Radio Study of the Pulsar Wind Nebula G21.5-0.9: Still No Evidence for the Supernova Shell
Michael F. Bietenholz, Heather Matheson, Samar Safi-Harb +2
We report on sensitive new 1.4-GHz VLA radio observations of the pulsar wind nebula G21.5-0.9, powered by PSR J1833-1034, and its environs. Our observations were targeted at search…
The First VLBI Image of the Young, Oxygen-Rich Supernova Remnant in NGC 4449
M. F. Bietenholz, N. Bartel, D. Milisavljevic +3
We report on sensitive 1.4-GHz VLBI radio observations of the unusually luminous supernova remnant SNR 4449-1 in the galaxy NGC 4449, which gave us the first well-resolved image of…
VLBI Observations of SN 2009bb
M. F. Bietenholz, A. M. Soderberg, N. Bartel +6
We report on VLBI, as well as VLA radio observations of the Type Ib/c supernova 2009bb. The high radio luminosity of this supernova seems to require relativistic outflow, implying…
SN 1986J VLBI: II. The Evolution of the Shell and the Central Source
M. F. Bietenholz, N. Bartel, M. P. Rupen
We present new VLBI images of supernova 1986J, taken at 5, 8.4 and 22 GHz between t=22 to 25 yr after the explosion. The shell expands as t^(0.69+-0.03). We estimate the progenitor…
A mildly relativistic radio jet from the otherwise normal Type Ic Supernova 2007gr
Z. Paragi, G. B. Taylor, C. Kouveliotou +11
The class of type Ic supernovae have drawn increasing attention since 1998 owing to their sparse association (only four so far) with long duration gamma-ray bursts. Although both p…