Journal
SCIENCE
Volume 346, Issue 6210, Pages 732-735Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1258168
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Funding
- NASA APRA [NNX07AI54G, NNG05WC18G, NNX07AG43G, NNX07AJ24G, NNX10AE12G]
- Jet Propulsion Laboratory's Director's Research and Development Fund
- KAKENHI from Japan Society for the Promotion of Science (JSPS) [20.34, 18204018, 19540250, 21340047, 21111004]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Pioneer Project from Korea Astronomy and Space Science Institute (KASI)
- NASA Postdoctoral Program
- NSF CAREER [AST-0645427]
- NSF [AST-1313319]
- JSPS Research Fellowship for Young Scientists
- National Aeronautics and Space Administration
- National Science Foundation
- NASA [NNX10AE12G, 134474] Funding Source: Federal RePORTER
- Grants-in-Aid for Scientific Research [26800112, 13J10283] Funding Source: KAKEN
- National Research Council of Science & Technology (NST), Republic of Korea [2014180000] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1313319] Funding Source: National Science Foundation
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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.
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