主要内容:
数据太少, 应该还不是很可靠. 还有可能是因为宿主星系的消光更弱一点.
精彩摘抄:
文章信息:
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- · arXiv e-print (arXiv:0908.0410)
- · References in the Article
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| Title: |
| Are GRB optical afterglows relatively brighter at high z? |
| Authors: |
| Imerito, A.; Coward, D. M.; Burman, R. R.; Blair, D. G. |
| Publication: |
| eprint arXiv:0908.0410 |
| Publication Date: |
| 08/2009 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics |
| Comment: |
| 5 pages, 3 figures, 1 table |
| Bibliographic Code: |
| 2009arXiv0908.0410I |
Abstract
The redshift distribution of gamma-ray bursts (GRBs) is strongly biased by selection effects. We investigate, via Monte Carlo simulations, one possible selection effect that may be modifying the Swift GRB redshift distribution. We show how telescope response times to acquire a GRB redshift may, via the Malmquist effect and GRB optical afterglow brightness distribution, introduce a bias into the average of the observed redshift distribution. It is difficult to reconcile a recently reported correlated trend between telescope response time and average redshifts unless we employ a redshift-dependent optical afterglow distribution. Simulations of this selection effect suggest that GRB optical afterglows may have been either intrinsically brighter early in the Universe or suffered less local host galaxy extinction.
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