A. Eungwanichayapant

A. Eungwanichayapant
Mae Fah Luang University | MFU · School of Science

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9
Publications
850
Reads
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30
Citations

Publications

Publications (9)
Article
Full-text available
Background Low-coverage sequencing is a cost-effective way to obtain reads spanning an entire genome. However, read depth at each locus is low, making sequencing error difficult to separate from actual variation. Prior to variant calling, sequencer reads are aligned to a reference genome, with alignments stored in Sequence Alignment/Map (SAM) files...
Article
Full-text available
Electron/positron pair halo is a physical phenomenon in which the very high energy gamma rays emitted from Blazar interact with cosmic infrared background (CIB) so that produce the electron/positron pairs; the produced electron/positron pairs could up-scatter the cosmic microwave background (CMB) reproducing the gamma-rays, thus these form the casc...
Article
Full-text available
It was previously suggested that e± pair halos could be observed in γ-rays. Searching for pair halos is a challenging topic in γ-ray astronomy that has not yet yielded a convincing detection for an individual object. Here we propose that X-ray observations could reveal the existence of e± pair halos. To support our suggestion, we computed the obser...
Article
Full-text available
An electron/positron pair halo is formed by electromagnetic cascades that initiate when high energy gamma-rays from extragalactic sources - i.e. Blazar AGN - interact with the cosmic infrared background (CIB), and are then absorbed via the electron/positron pair production process. The high energy electron/positron pairs produced could up-scatter t...
Conference Paper
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A giant e+/- pair halo is formed by electromagnetic cascades developing around an AGN under the intergalactic magnetic field (1nG - 1μG). Many studies have been focussed on the pair halos in the gamma band because it has been predicted that the e+/-s in the pair halos up-scatter the Cosmic Microwave Background (CMB) to be gamma-rays. However, the p...
Article
Full-text available
In this paper we study the formation of giant electrons-positron pair halos around the powerful high energy extragalactic sources. We investigate the dependence of radiation of pair halos, in particular the spectral and angular distributions on the energy spectrum of the primary gamma-rays, the redshift of the source, and the flux of the extragalac...
Article
Full-text available
We study the formation of giant electron-positron pair halos around the powerful high energy extragalactic sources. We investigate the dependence of radiation of pair halos, in particular the spectral and angular distributions on the energy spectrum of the primary gamma rays, the redshift of the source, and the flux of the extragalactic background...
Article
Full-text available
Hochenergetische (E>100 GeV) Gammastrahlen aus extragalaktischen Quellen werden infolge der gamma-gamma-Paarbildung (PP) von der kosmischen Infrarot-Hintergrund-strahlung (CIB) absorbiert und loesen elektromagnetische Schauer durch Paarbildung und inverse Comptonstreuung aus. Dies fuehrt zur Ausbildung eines Elektron-Positron-Paarhalos, dessen Teil...
Article
Thesis (M.Sc.)--Chulalongkorn University, 1999 We consider prospects for cosmic ray acceleration at superluminal shocks and examine in detail the example of the pulsar wind termination shock. We study various models of the shock and acceleration mechanisms. Not only did we modify a transport equation for use in this case but we also wrote a compute...

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