FERMI LARGE AREA TELESCOPE CONSTRAINTS ON THE GAMMA-RAY OPACITY OF THE UNIVERSE
FERMI LARGE AREA TELESCOPE CONSTRAINTS ON THE GAMMA-RAY OPACITY OF THE UNIVERSE
复制标题
费米大面积望远镜对宇宙伽马射线不透明度的限制
DOI:
10.1088/0004-637x/723/2/1082
复制
发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Abdo A
中科院分区:
文献类型:
--
作者:
Abdo A
The extragalactic background light (EBL) includes photons with wavelengths from ultraviolet to infrared, which are effective at attenuating gamma rays with energy above∼ 10 GeV during propagation from sources at cosmological distances. This results in a redshift-and energy-dependent attenuation of the γ-ray flux of extragalactic sources such as blazars and gamma-ray bursts (GRBs). The Large Area Telescope on board Fermi detects a sample of γ-ray blazars with redshift up to z∼ 3, and GRBs with redshift up to z∼ 4.3. Using photons above 10 GeV collected by Fermi over more than one year of observations for these sources, we investigate the effect of γ-ray flux attenuation by the EBL. We place upper limits on the γ-ray opacity of the universe at various energies and redshifts and compare this with predictions from well-known EBL models. We find that an EBL intensity in the optical–ultraviolet wavelengths as great as predicted by the" baseline" model of Stecker et al. can be ruled out with high confidence.
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DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
P. Serpico
通讯作者:
P. Serpico
影响因子:
4.9
作者:
Atwood, W. B.;Abdo, A. A.;Ziegler, M.
通讯作者:
Ziegler, M.
DOI:
--
发表时间:
1991
期刊:
影响因子:
--
作者:
J. Stocke;J. Case;M. Donahue;J. Shull;T. Snow
通讯作者:
T. Snow
DOI:
--
发表时间:
2002
期刊:
影响因子:
--
作者:
H. C. Aharonian;E. al.
通讯作者:
E. al.
DOI:
10.1088/0004-637x/715/1/429
发表时间:
2010-01
期刊:
The Astrophysical Journal
影响因子:
--
作者:
A. Abdo;A. Abdo;M. Ackermann;M. Ajello;A. Allafort;E. Antolini;E. Antolini;W. Atwood;M. Axelss
通讯作者:
A. Abdo;A. Abdo;M. Ackermann;M. Ajello;A. Allafort;E. Antolini;E. Antolini;W. Atwood;M. Axelss