近红外河外背景光各向异性的起源。

On the origin of near-infrared extragalactic background light anisotropy.

机构信息

Department of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA. Jet Propulsion Laboratory (JPL), National Aeronautics and Space Administration (NASA), Pasadena, CA 91109, USA.

Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.

出版信息

Science. 2014 Nov 7;346(6210):732-5. doi: 10.1126/science.1258168.

DOI:10.1126/science.1258168

PMID:25378620

Abstract

Extragalactic background light (EBL) anisotropy traces variations in the total production of photons over cosmic history and may contain faint, extended components missed in galaxy point-source surveys. Infrared EBL fluctuations have been attributed to primordial galaxies and black holes at the epoch of reionization (EOR) or, alternately, intrahalo light (IHL) from stars tidally stripped from their parent galaxies at low redshift. We report new EBL anisotropy measurements from a specialized sounding rocket experiment at 1.1 and 1.6 micrometers. The observed fluctuations exceed the amplitude from known galaxy populations, are inconsistent with EOR galaxies and black holes, and are largely explained by IHL emission. The measured fluctuations are associated with an EBL intensity that is comparable to the background from known galaxies measured through number counts and therefore a substantial contribution to the energy contained in photons in the cosmos.

摘要

河外背景光（EBL）各向异性追踪了宇宙历史上光子总产量的变化，并且可能包含在星系点源调查中错过的微弱扩展成分。红外 EBL 涨落归因于原初星系和再电离时代（EOR）的黑洞，或者，交替地，来自于在低红移时被其母星系潮汐撕裂的恒星的内晕光（IHL）。我们报告了在 1.1 和 1.6 微米处的专门 sounding 火箭实验的新 EBL 各向异性测量结果。观测到的涨落超过了已知星系群的幅度，与 EOR 星系和黑洞不一致，并且主要由 IHL 发射解释。测量到的涨落与通过计数测量到的已知星系的背景光强相当，因此对宇宙中光子所包含的能量有很大的贡献。