Back to Search
Start Over
Peak energy–isotropic luminosity correlation and jet opening angle evolution in Swift-BAT short GRBs with soft-tail emission.
- Source :
-
Publications of the Astronomical Society of Japan . Jun2024, Vol. 76 Issue 3, p365-373. 9p. - Publication Year :
- 2024
-
Abstract
- Some short gamma-ray bursts (SGRBs) exhibit a short-duration and spectral hard emission (referred to as a "hard spike") followed by a slightly longer soft emission (known as a "soft tail"). We identified nine SGRBs with the known redshift in the Swift/BAT gamma-ray burst catalog by specifically searching for the soft tail. We found that the spectra of these SGRBs can be described as a cutoff power-law model for the hard spike and the soft tail, and both show a time variation keeping the E peak– L iso correlation. This suggests that the emission mechanisms of both phenomena are identical. Furthermore, we found a trend of luminosity evolution as a function of redshift. This phenomenon suggests that these bursts originate from sources that are intrinsically bright and/or energy-density-concentrated within a narrower jet at higher redshift. We demonstrate that the average jet opening angle, derived from the jet break, can be explained by considering a model based on a strongly redshift-dependent jet opening angle. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GAMMA ray bursts
*LUMINOSITY
*ANGLES
*TIMEKEEPING
*GRAVITATIONAL waves
*REDSHIFT
Subjects
Details
- Language :
- English
- ISSN :
- 00046264
- Volume :
- 76
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Publications of the Astronomical Society of Japan
- Publication Type :
- Academic Journal
- Accession number :
- 177947895
- Full Text :
- https://doi.org/10.1093/pasj/psae018