Observational Characteristics of Giant Pulses and Related Phenomena
| Autor: | Haydon S. Knight |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Physics
Brightness Single process Crab Pulsar Astrophysics::High Energy Astrophysical Phenomena Astrophysics::Instrumentation and Methods for Astrophysics Astronomy Astronomy and Astrophysics Astrophysics Pulse (physics) Microsecond Pulsar Space and Planetary Science Millisecond pulsar Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Chinese Journal of Astronomy and Astrophysics. 6:41-47 |
| ISSN: | 1009-9271 |
| DOI: | 10.1088/1009-9271/6/s2/9 |
| Popis: | Evidence now exists that at least 14 pulsars emit distinctive pulses that are stronger and narrower than the average pulse. I review observations of these pulses in an effort to determine which sources share a common emission-mechanism. All of the giant pulses emitted by millisecond pulsars have power-law energy-statistics and occur in narrow phase-windows that coincide with those of X-ray emission. The giant pulses of millisecond pulsars therefore probably originate from a single process. They are always unresolved at microsecond timescales, and therefore the emission is likely to arise from the superposition of a small number of nano-shots. Most are actually very weak when compared to the average pulse. They are only ``giant'' when examined in terms of their ultra-high brightness temperatures. Giant pulses from other sources have a variety of widths, shapes, and energy distributions. The giant pulses from the Crab pulsar have intrinsic sub-microsecond timescales like the giant pulses of the millisecond pulsars, and therefore probably originate from the same mechanism. Other phenomena, such as giant micro-pulses from young pulsars and giant pulses from slow pulsars have not been shown to have such short timescales. These phenomena likely arise from other mechanisms. |
| Databáze: | OpenAIRE |
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