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arXiv 0904.4276astro-ph.HE
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超高能宇宙射线与红光星系的相关

Correlations between Ultrahigh Energy Cosmic Rays and Infrared-Luminous Galaxies

Andreas A. Berlind, Glennys R. Farrar, Ingyin Zaw

摘要:

通过对红外光度大于10 ^{10} L_sun的PSCz星系进行红移角-红外光度扫描,证实了Pierre Auger天文台利用活动星系核的非均匀Veron-Cetty Veron(VCV)星表建立的UHECR视界。最强的相关性-对于z <0.016,psi = 2.1 deg,并且L_ir> 10 ^{10.5} L_sun-出现在小于0.3%的具有各向同性源方向的扫描中。当我们对使用UHECR能量阈值施加惩罚时,该阈值被调整为最大化与VCV的相关性,显著性降低至1.1%。由于PSCz星表是完整的,并且这些参数的体积有限,这表明皮埃尔·俄歇天文台发现的UHECR视界不是VCV星表的不完整性和其他特性的产物。UHECR和附近最高红外光度的PSCz星系之间的相关性的强度比大约90%的PSCz星系的光度分配混乱的试验更强。如果未来的数据证实,这一结果将表明,UHECR的来源更强烈地与明亮的红外星系比普通的,低红外光度星系。

英文摘要:

We confirm the UHECR horizon established by the Pierre Auger Observatory using the heterogeneous Veron-Cetty Veron (VCV) catalog of AGNs, by performing a redshift-angle-IR luminosity scan using PSCz galaxies having infrared luminosity greater than 10^{10}L_sun. The strongest correlation -- for z < 0.016, psi = 2.1 deg, and L_ir > 10^{10.5}L_sun -- arises in fewer than 0.3% of scans with isotropic source directions. When we apply a penalty for using the UHECR energy threshold that was tuned to maximize the correlation with VCV, the significance degrades to 1.1%. Since the PSCz catalog is complete and volume-limited for these parameters, this suggests that the UHECR horizon discovered by the Pierre Auger Observatory is not an artifact of the incompleteness and other idiosyncrasies of the VCV catalog. The strength of the correlation between UHECRs and the nearby highest-IR-luminosity PSCz galaxies is stronger than in about 90% percent of trials with scrambled luminosity assignments for the PSCz galaxies. If confirmed by future data, this result would indicate that the sources of UHECRs are more strongly associated with luminous IR galaxies than with ordinary, lower IR luminosity galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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