An Unexpectedly Low-redshift Excess of Swift Gamma-ray Burst Rate
TLDR
In this article, the authors used the Lynden-Bell method to study the luminosity function and rate of Swift long GRBs without any assumptions and found that the luminosities of GRBs evolve with redshift as with.Abstract:
Gamma-ray bursts (GRBs) are the most violent explosions in the universe and can be used to explore the properties of the high-redshift universe. It is believed that long GRBs are associated with the deaths of massive stars. Therefore, it is possible to use GRBs to investigate the star formation rate (SFR). In this paper, we use Lynden-Bell?s method to study the luminosity function and rate of Swift long GRBs without any assumptions. We find that the luminosities of GRBs evolve with redshift as with . After correcting the redshift evolution through , the luminosity function can be expressed as for dim GRBs and for bright GRBs, with the break point . We also find that the formation rate of GRBs is almost constant at for the first time, which is remarkably different from the SFR. At , the formation rate of GRBs is consistent with the SFR. Our results are dramatically different from previous studies. We discuss a few possible reasons for this low-redshift excess. We also test the robustness of our results using Monte Carlo simulations. The distributions of mock data (i.e., luminosity?redshift distribution, luminosity function, cumulative distribution, and log N?log S distribution) are in good agreement with observations. Also, we find that there are remarkable differences between the mock data and the observations if long GRBs are unbiased tracers of SFR at .read more
Citations
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UniverseMachine: The Correlation between Galaxy Growth and Dark Matter Halo Assembly from z=0-10
TL;DR: Giacconi Fellowship from the Space Telescope Science Institute; NASA through a Hubble Fellowship grant from NASA's HST-HF2-51353.001-A; NASANational Aeronautics & Space Administration (NAS5-26555); NSFNational Science Foundation (NSF) [1066293]; National Science Foundation(NSF)'s National Research Foundation (NRF) [PHY11-25915]; Munich Institute for Astro-and Particle Physics (MIAPP) of the DFG cluster of excellence 'Origin and Structure of the Universe'
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The Swift Gamma-Ray Burst Host Galaxy Legacy Survey. I. Sample Selection and Redshift Distribution
Daniel A. Perley,Daniel A. Perley,Thomas Krühler,Thomas Krühler,Steve Schulze,Steve Schulze,A. de Ugarte Postigo,Jens Hjorth,Edo Berger,S. B. Cenko,S. B. Cenko,Ranga-Ram Chary,Antonino Cucchiara,Richard S. Ellis,Wen-fai Fong,Johan P. U. Fynbo,Javier Gorosabel,Jochen Greiner,Pall Jakobsson,S. Kim,S. Kim,Tanmoy Laskar,Andrew J. Levan,Michał J. Michałowski,Bo Milvang-Jensen,Nial R. Tanvir,Christina C. Thöne,Klaas Wiersema +27 more
TL;DR: The Swift Gamma-Ray Burst Host Galaxy Legacy Survey (SHOALS) as mentioned in this paper is a multi-observatory high-redshift galaxy survey targeting the largest unbiased sample of long-duration gamma-ray burst (GRB) hosts yet assembled (119 in total).
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TL;DR: In this paper, the authors apply a unified method to systematically study the redshift-dependent event rate densities and the global luminosity functions (GLFs; ignoring redshift evolution) of extragalactic high-energy transients.
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A comprehensive statistical study on gamma-ray bursts
TL;DR: In this paper, the authors collected 6289 gamma-ray bursts (GRBs) from the literature, including prompt emission, afterglow and host galaxy properties, and used this large sample to reveal the intrinsic properties of GRBs.
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Extra-galactic high-energy transients: event rate densities and luminosity functions
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TL;DR: In this paper, a unified method was applied to systematically study the redshift-dependent event rate densities and the global luminosity functions (ignoring redshift evolution) of these transients.
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