What is recorded here?
Fermi-LAT combined 46 months of gamma-ray observations of 150 selected BL Lac objects at redshifts 0.03–1.6. Their spectra showed an energy- and redshift-dependent suppression consistent with absorption on diffuse extragalactic background light, enabling model-based constraints on the optical–ultraviolet background.
Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.
Scientific scope
The attenuation is inferred statistically from a population and a modeled extrapolation of intrinsic blazar spectra, not measured directly for every source. The quoted significance of up to about six standard deviations compares specified model families to a no-attenuation hypothesis; intrinsic source evolution, sample selection and instrumental response remain analysis assumptions. The preprint’s simulations and robustness tests cover selected models rather than every possible source spectrum.
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People and systems
M. Ackermann; M. Ajello
These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged. The recorded author list is incomplete.
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English catalogue narrative
Fermi finds a background-light attenuation signature in blazar spectra
Fermi-LAT combined 46 months of gamma-ray observations of 150 selected BL Lac objects at redshifts 0.03–1.6. Their spectra showed an energy- and redshift-dependent suppression consistent with absorption on diffuse extragalactic background light, enabling model-based constraints on the optical–ultraviolet background.
Scientific scope
The attenuation is inferred statistically from a population and a modeled extrapolation of intrinsic blazar spectra, not measured directly for every source. The quoted significance of up to about six standard deviations compares specified model families to a no-attenuation hypothesis; intrinsic source evolution, sample selection and instrumental response remain analysis assumptions. The preprint’s simulations and robustness tests cover selected models rather than every possible source spectrum.
Reading status
This is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.
People and systems
M. Ackermann; M. Ajello
These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.