No evidence for dust extinction in GRB 050904 at z ~ 6.3

@article{Zafar2010NoEF,
  title={No evidence for dust extinction in GRB 050904 at z ~ 6.3},
  author={Tayyaba Zafar and Darach Watson and Daniele B. Malesani and Paul M. Vreeswijk and Johan P. U. Fynbo and Jens Hjorth and Andrew J. Levan and Michal J. Michalowski Dark and University of Warwick and University of Edinburgh},
  journal={Astronomy and Astrophysics},
  year={2010},
  volume={515},
  pages={1-6}
}
Context. Gamma-ray burst (GRB) afterglows are excellent and sensitive probes of gas and dust in star-forming galaxies at all epochs. It has been posited that dust in the early Universe must be different from dust at lower redshifts. To date two reports in the literature directly support this contention, one of which is based on the spectral shape of the afterglow spectrum of GRB050904 at z = 6.295. Aims. Here we reinvestigate the afterglow of GRB050904 to understand cosmic dust at high… Expand

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References

SHOWING 1-10 OF 63 REFERENCES
Dust Properties at z = 6.3 in the Host Galaxy of GRB 050904
We investigate the dust extinction properties in the host galaxy of GRB 050904 at z = 6.29 by analyzing simultaneous broadband observations of the optical and UV afterglow at three different epochs.Expand
Evidence for supernova-synthesized dust from the rising afterglow of GRB 071025 at z∼ 5
We present observations and analysis of the broad-band afterglow of Swift GRB 071025. Using optical and infrared (RIYJHK) photometry, we derive a photometric redshift of 4.4 < z < 5.2; at thisExpand
Dust Extinction in High-z Galaxies with GRB Afterglow Spectroscopy - The 2175{\AA} Feature at z=2.45
We report the clear detection of the 2175A dust absorption feature in the optical afterglow spectrum of the gamma-ray burst (GRB) GRB070802 at a redshift of z=2.45. This is the highest redshift for aExpand
A photometric redshift of z = 6.39 ± 0.12 for GRB 050904
TLDR
The discovery of the bright near-infrared afterglow of GRB 050904 is reported, and it is demonstrated that GRBs can be used to trace the star formation, metallicity, and reionization histories of the early Universe. Expand
Implications for Cosmic Reionization from the Optical Afterglow Spectrum of the Gamma-Ray Burst 050904 at z = 6.3
The gamma-ray burst (GRB) 050904 at z =6 .3 provides the first opportunity to probe the intergalactic medium (IGM) by GRBs at the epoch of reionization. Here, we present a spectral modeling analysisExpand
An optical spectrum of the afterglow of a γ-ray burst at a redshift of z = 6.295
The prompt γ-ray emission from γ-ray bursts (GRBs) should be detectable out to distances of z > 10 (ref. 1), and should therefore provide an excellent probe of the evolution of cosmic star formation,Expand
A Metal-rich Molecular Cloud Surrounds GRB 050904 at Redshift 6.3
GRB 050904 is the gamma-ray burst with the highest measured redshift. We performed time resolved X-ray spectroscopy of the late GRB and early afterglow emission. We find robust evidence for aExpand
Modeling GRB 050904: Autopsy of a Massive Stellar Explosion at z = 6.29
GRB 050904, at redshift z = 6.29, was discovered and observed by Swift, and, with a spectroscopic redshift from the Subaru Telescope, is the first gamma-ray burst to be identified from beyond theExpand
GRB 080913 AT REDSHIFT 6.7
We report on the detection by Swift of GRB 080913, and subsequent optical/near-infrared follow-up observations by GROND, which led to the discovery of its optical/NIR afterglow and the recognition ofExpand
Outshining the quasars at reionization: the X-ray spectrum and light curveof the redshift 6.29 gamma-ray burst GRB 050904
Gamma-ray burst (GRB) 050904 is the most distant X-ray source known, at z = 6.295, comparable to the farthest AGNs and galaxies. Its X-ray flux decays, but not as a power law; it is dominated byExpand
...
1
2
3
4
5
...