Distribution of Spectral Lags in Gamma‐Ray Bursts | Zendy

Li Chen | Zendy; Yuqing Lou | Zendy; Mei Wu | Zendy; J. L. Qu | Zendy; S. M. Jia | Zendy; Xuejuan Yang | Zendy

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Distribution of Spectral Lags in Gamma‐Ray Bursts

Author(s) -

Li Chen,

Yuqing Lou,

Mei Wu,

J. L. Qu,

S. M. Jia,

Xuejuan Yang

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/426774

Subject(s) - gamma ray burst , physics , astrophysics , observatory , photon , luminosity , spectral energy distribution , lag , spectral properties , pulse (music) , gamma ray , astronomy , optics , galaxy , detector , computer network , computer science

Using the data acquired in the Time To Spill (TTS) mode for long gamma-raybursts (GRBs) collected by the Burst and Transient Source Experiment on boardthe Compton Gamma Ray Observatory (BATSE/CGRO), we have carefully measuredspectral lags in time between the low (25-55 keV) and high (110-320 keV) energybands of individual pulses contained in 64 multi-peak GRBs. We find that thetemporal lead by higher-energy gamma-ray photons (i.e., positive lags) is thenorm in this selected sample set of long GRBs. While relatively few in number,some pulses of several long GRBs do show negative lags. This distribution ofspectral lags in long GRBs is in contrast to that in short GRBs. This apparentdifference poses challenges and constraints on the physical mechanism(s) ofproducing long and short GRBs. The relation between the pulse peak count ratesand the spectral lags is also examined. Observationally, there seems to be noclear evidence for systematic spectral lag-luminosity connection for pulseswithin a given long GRB.Comment: 20 pages, 4 figure

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