Spatially Resolved Energetic Electron Properties for the 21 May 2004 Flare from Radio Observations and 3D Simulations

Spatially Resolved Observations of the Galactic Center Source , IRS 21

We present diffraction-limited 2-25 µm images obtained with the W. M. Keck 10-m telescopes that spatially resolve the cool source, IRS 21, one of a small group of enigmatic objects in the central parsec of our Galaxy that have eluded classification. Modeled as a Gaussian, the azimuthally-averaged intensity profile of IRS 21 has a half-width half-maximum (HWHM) size of 650±80 AU at 2.2 µm and an...

3D MHD Simulations of Radio Galaxies Including Nonthermal Electron Transport

A Re - Brightening of the Radio Nebula Associated with the 2004 December 27 Giant Flare From

On 2004 Dec. 27, a giant γ-ray flare was detected from the magnetar SGR 1806–20. A radio observation seven days later revealed an expanding radio nebula at this position. Here we present results from an on-going monitoring campaign of this source with the Australia Telescope Compact Array and Very Large Array. These data indicate that there was an increase in the observed flux ∼25 days after th...

Structure in the radio counterpart to the 2004 Dec 27 giant flare from SGR 1806 - 20

On Dec 27, 2004, the magnetar SGR 1806-20 underwent an enormous outburst resulting in the formation of an expanding, moving, and fading radio source. We report observations of this radio source with the Multi-Element Radio-Linked Interferometer Network (MERLIN) and the Very Long Baseline Array (VLBA). The observations confirm the elongation and expansion already reported based on observations a...

The radio morphology of a spatially resolved SSC model

One of the main, unresolved questions about the nature of quasars is the position of the acceleration site responsible for the highest energies. The attempt to investigate this question in the energy regime with the highest resolution, the radio band, has the downside that no theoretical model exists that can connect these two regimes. The model in this work tries to shrink this gap by extendin...