Redshift Evolution of the Lag Relation for Swift GRBs

Details Redshift Evolution of the Lag Relation for Swift GRBs Redshift Evolution of the Lag Relation for Swift GRBs

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1358..227a&link_type=abstract

GAMMA RAY BURSTS 2010. AIP Conference Proceedings, Volume 1358, pp. 227-230 (2011).

Physics

Redshift, Gamma-Rays, Brightness, Data Acquisition, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Gamma-Ray, Magnitudes And Colors, Luminosities, Data Acquisition: Hardware And Software

Scientific paper

The lag relation for gamma-ray bursts (GRBs) is an anticorrelation between the time lag, τ, which represents the delay between the arrival of hard and soft photons, and the peak isotropic luminosity, Lp. In this study, we investigate the possible redshift evolution of this relation by using a sample of 31 Swift bursts taken from Ukwatta et al. (2010), who extracted the time-lags for all combinations of the Swift energy bands utilizing a modified cross-correlation method. Our analysis consists of binning the data in redshift, z, then applying a fit of the form: log(Lp) = A+Blog(τrest/<τrest>) for each bin, where τrest is the time-lag in the burst's rest frame, and <τrest> is the corresponding mean value for the entire sample. The objective is to see whether the fitting parameters, A and B, evolve in a systematic way with z. Our results indicate that the normalization, A, does vary in a systematic way with redshift, whereas the slope, B, does not. However, it should be noted that although reasonable chi-square values were obtained, the data showed large scatter.

Affiliated with

Also associated with

No associations

Rating

Redshift Evolution of the Lag Relation for Swift GRBs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Redshift Evolution of the Lag Relation for Swift GRBs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Redshift Evolution of the Lag Relation for Swift GRBs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1740079