The lag-luminosity relation in the GRB source frame: an investigation withSwiftBAT bursts
ABSTRACT Spectral lag, which is defined as the difference in time of arrival of high- and low-energy photons, is a common feature in gamma-ray bursts (GRBs). Previous investigations have shown a correlation between this lag and the isotropic peak luminosity for long duration bursts. However, most of...
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| Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2012-01, Vol.419 (1), p.614-623 |
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| creator | Ukwatta, T. N Dhuga, K. S Stamatikos, M Dermer, C. D Sakamoto, T Sonbas, E Parke, W. C Maximon, L. C Linnemann, J. T Bhat, P. N Eskandarian, A Gehrels, N Abeysekara, A. U Tollefson, K Norris, J. P |
| description | ABSTRACT Spectral lag, which is defined as the difference in time of arrival of high- and low-energy photons, is a common feature in gamma-ray bursts (GRBs). Previous investigations have shown a correlation between this lag and the isotropic peak luminosity for long duration bursts. However, most of the previous investigations used lags extracted in the observer frame only. In this work (based on a sample of 43Swift long GRBs with known redshifts), we present an analysis of the lag-luminosity relation in the GRB source frame. Our analysis indicates a higher degree of correlation -0.82 ± 0.05 (chance probability of 5.5 × 10-5) between the spectral lag and the isotropic peak luminosity,L iso, with a best-fitting power-law index of -1.2 ± 0.2, such thatL isolag-1.2. In addition, there is an anticorrelation between the source-frame spectral lag and the source-frame peak energy of the burst spectrum,E pk(1 +z ). [PUBLICATION ABSTRACT] |
| doi_str_mv | 10.1111/j.1365-2966.2011.19723.x |
| format | Article |
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N ; Dhuga, K. S ; Stamatikos, M ; Dermer, C. D ; Sakamoto, T ; Sonbas, E ; Parke, W. C ; Maximon, L. C ; Linnemann, J. T ; Bhat, P. N ; Eskandarian, A ; Gehrels, N ; Abeysekara, A. U ; Tollefson, K ; Norris, J. P</creator><creatorcontrib>Ukwatta, T. N ; Dhuga, K. S ; Stamatikos, M ; Dermer, C. D ; Sakamoto, T ; Sonbas, E ; Parke, W. C ; Maximon, L. C ; Linnemann, J. T ; Bhat, P. N ; Eskandarian, A ; Gehrels, N ; Abeysekara, A. U ; Tollefson, K ; Norris, J. P</creatorcontrib><description>ABSTRACT Spectral lag, which is defined as the difference in time of arrival of high- and low-energy photons, is a common feature in gamma-ray bursts (GRBs). Previous investigations have shown a correlation between this lag and the isotropic peak luminosity for long duration bursts. However, most of the previous investigations used lags extracted in the observer frame only. In this work (based on a sample of 43Swift long GRBs with known redshifts), we present an analysis of the lag-luminosity relation in the GRB source frame. Our analysis indicates a higher degree of correlation -0.82 ± 0.05 (chance probability of 5.5 × 10-5) between the spectral lag and the isotropic peak luminosity,L iso, with a best-fitting power-law index of -1.2 ± 0.2, such thatL isolag-1.2. In addition, there is an anticorrelation between the source-frame spectral lag and the source-frame peak energy of the burst spectrum,E pk(1 +z ). 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| source | Oxford Journals Open Access Collection; Wiley Online Library Journals Frontfile Complete |
| subjects | Atoms & subatomic particles Gamma ray astronomy Luminosity Starbursts |
| title | The lag-luminosity relation in the GRB source frame: an investigation withSwiftBAT bursts |
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