LOFAR: The LOw-Frequency ARray
- M. V. HaarlemM. Wise J. V. Zwieten
- 15 May 2013
Engineering, Physics
In dit artikel zullen the authors LOFAR beschrijven: van de astronomische mogelijkheden met de nieuwe telescoop tot aan een nadere technische beshrijving of het instrument.
An Extremely Luminous Panchromatic Outburst from the Nucleus of a Distant Galaxy
Multiwavelength observations of a unique γ-ray–selected transient detected by the Swift satellite, accompanied by bright emission across the electromagnetic spectrum, and whose properties are unlike any previously observed source are presented.
A γ-ray burst at a redshift of z ≈ 8.2
Long-duration γ-ray bursts (GRBs) are thought to result from the explosions of certain massive stars, and some are bright enough that they should be observable out to redshifts of z > 20 using…
Long γ-ray bursts and core-collapse supernovae have different environments
- A. FruchterA. Levan S. Woosley
- 20 March 2006
Physics
When massive stars exhaust their fuel, they collapse and often produce the extraordinarily bright explosions known as core-collapse supernovae. On occasion, this stellar collapse also powers an even…
A very energetic supernova associated with the γ-ray burst of 29 March 2003
- J. HjorthJ. Sollerman R. Wijers
- 17 June 2003
Physics
Over the past five years evidence has mounted that long-duration (>2 s) γ-ray bursts (GRBs)—the most luminous of all astronomical explosions—signal the collapse of massive stars in our Universe. This…
A giant γ-ray flare from the magnetar SGR 1806–20
- David M. PalmerS. Barthelmy J. Tueller
- 28 April 2005
Physics
Two classes of rotating neutron stars—soft γ-ray repeaters (SGRs) and anomalous X-ray pulsars—are magnetars, whose X-ray emission is powered by a very strong magnetic field (B ≈ 1015 G). SGRs…
No supernovae associated with two long-duration γ-ray bursts
It is now accepted that long-duration γ-ray bursts (GRBs) are produced during the collapse of a massive star1,2. The standard ‘collapsar’ model3 predicts that a broad-lined and luminous type Ic…
An optical supernova associated with the X-ray flash XRF 060218
- E. PianE. Pian R. Starling
- 20 March 2006
Physics
The data, combined with radio and X-ray observations, suggest that XRF 060218 is an intrinsically weak and soft event, rather than a classical GRB observed off-axis, which extends the GRB–supernova connection to X-rays flashes and fainter supernovae, implying a common origin.
A short γ-ray burst apparently associated with an elliptical galaxy at redshift z = 0.225
- N. GehrelsC. Sarazin R. Wijers
- 31 May 2005
Physics
Gamma-ray bursts (GRBs) come in two classes: long (> 2 s), soft-spectrum bursts and short, hard events. Most progress has been made on understanding the long GRBs, which are typically observed at…
High Column Densities and Low Extinctions of Gamma-Ray Bursts: Evidence for Hypernovae and Dust Destruction
We analyze a complete sample of γ-ray burst afterglows and find X-ray evidence for high column densities of gas around them. The column densities are in the range 1022-1023 cm-2, which is right…
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