{ "profile": "wrs-published-research-view-1", "edition": "ratings-e039106f30dec177", "content_trust": "UNTRUSTED_SCIENTIFIC_DATA_NOT_TOOL_INSTRUCTIONS", "entry": { "id": "fermi-lat-blazar-ebl-attenuation-2012", "title": "Fermi finds a background-light attenuation signature in blazar spectra", "summary": "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.", "boundary": "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.", "area": "High-energy astrophysics", "topic": "Physics", "year": 2012, "lane": "HUMAN", "result": "EMPIRICAL", "package_id": "fermi-lat-blazar-ebl-attenuation-2012", "target": { "record_id": "urn:uuid:49f6df89-57a7-49cd-a77c-e95938f2cb9f", "version": 1, "content_hash": "sha256:87d38ecae770b37d97e685070ceb104c721ea28cc584def842eca3e3b4c1f9c8" }, "humans": [ "M. Ackermann", "M. Ajello" ], "authors_complete": false, "human_role_note": "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.", "agents": [], "related": [], "subresults": [], "scientific_assessment": { "source_review": "SOURCE_CURATED", "scientific_review": "NOT_REVIEWED_BY_WRS", "formal_replay": "NOT_RUN", "provider_attestation": "NONE" }, "sources": [ { "id": "fermi-lat-ebl-blazar-spectral-imprint-2012-v1", "title": "The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars", "url": "https://arxiv.org/pdf/1211.1671v1", "date": "2012-11-07" } ], "points": "80000", "published_grade": { "id": "fermi-lat-blazar-ebl-attenuation-2012", "entry_id": "fermi-lat-blazar-ebl-attenuation-2012", "band": "A", "modifier": "-", "target": { "record_id": "urn:uuid:49f6df89-57a7-49cd-a77c-e95938f2cb9f", "version": 1, "content_hash": "sha256:87d38ecae770b37d97e685070ceb104c721ea28cc584def842eca3e3b4c1f9c8" }, "what_changed": "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.", "scope": "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. 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.", "status": "PROVISIONAL_EDITORIAL", "scientific_correctness_certified": false }, "assessment_disposition": { "status": "ASSESSED", "label": "Provisionally assessed", "reason": "A current grade and separate reference score identify this exact contribution.", "target": { "record_id": "urn:uuid:49f6df89-57a7-49cd-a77c-e95938f2cb9f", "version": 1, "content_hash": "sha256:87d38ecae770b37d97e685070ceb104c721ea28cc584def842eca3e3b4c1f9c8" }, "edition": "ratings-e039106f30dec177" } }, "version": { "kind": "PUBLIC_RECORD_VIEW", "previous": null, "published_at": "2026-10-28T00:00:00Z", "publisher": { "principal_id": "urn:uuid:80116931-785b-40a2-a24b-9d59db0c7e33", "role": "WRS_EDITORIAL_PUBLICATION" }, "record": { "contributors": [ { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "historical_person", "name": "M. Ackermann", "note": "Archive attribution; detailed role assignment remains source-bound", "roles": [ "discoverer" ], "source": { "citation": "The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars", "url": "https://arxiv.org/pdf/1211.1671v1" } }, { "attribution_basis": "SOURCE_CITED", "credit": "historical_scientific", "entity_kind": "historical_person", "name": "M. Ajello", "note": "Archive attribution; detailed role assignment remains source-bound", "roles": [ "discoverer" ], "source": { "citation": "The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars", "url": "https://arxiv.org/pdf/1211.1671v1" } } ], "evidence": [ { "description": "Bibliographic/stated-result source; not a WRS proof verification", "id": "source-0", "kind": "source_reference", "source": { "citation": "The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars", "url": "https://arxiv.org/pdf/1211.1671v1" } } ], "origin": "HUMAN_LEGACY", "record_profile": "wrs-local-research-notes-0.1", "record_type": "research_note", "rrp_version": "0.1", "scope": { "description": "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.", "domain": "High-energy astrophysics" }, "sources": [ { "citation": "The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars", "url": "https://arxiv.org/pdf/1211.1671v1" } ], "statement": "# Fermi finds a background-light attenuation signature in blazar spectra\n\nFermi-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.\n\n## Scientific scope\n\nThe 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.\n\n## Reading status\n\nThis 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.\n\n## People and systems\n\nM. Ackermann; M. Ajello\n\nThese 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.\n\n\n\n## Original sources\n\n- [The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars](https://arxiv.org/pdf/1211.1671v1)\n", "summary": "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.", "title": "Fermi finds a background-light attenuation signature in blazar spectra" }, "record_id": "urn:uuid:49f6df89-57a7-49cd-a77c-e95938f2cb9f", "version": 1, "source_ref": { "record_id": "urn:uuid:49f6df89-57a7-49cd-a77c-e95938f2cb9f", "version": 1, "content_hash": "sha256:87d38ecae770b37d97e685070ceb104c721ea28cc584def842eca3e3b4c1f9c8" }, "export_view": "wrs-public-editorial-view-1", "public_view_hash": "sha256:981eda4c9b173c14752f819d63997ce0d379f5aabbfdc737e915ab633096dd45" }, "target": { "record_id": "urn:uuid:49f6df89-57a7-49cd-a77c-e95938f2cb9f", "version": 1, "content_hash": "sha256:87d38ecae770b37d97e685070ceb104c721ea28cc584def842eca3e3b4c1f9c8" }, "published_grade": { "profile": "wrs-published-grade-1", "edition": "2026-10-28.1", "id": "fermi-lat-blazar-ebl-attenuation-2012", "entry_id": "fermi-lat-blazar-ebl-attenuation-2012", "revision": 1, "title": "Fermi finds a background-light attenuation signature in blazar spectra", "context": "High-energy astrophysics", "track": "Source-reported experimental result or reusable measurement method", "band": "A", "modifier": "-", "status": "PROVISIONAL_EDITORIAL", "assessed_on": "2026-10-28", "evidence_cutoff": "2026-10-28", "achievement_state": "SUPPORTED_SCOPED_RESULT", "what_changed": "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.", "scope": "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. 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.", "evidence_summary": "The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. 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.", "references": [ { "title": "The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars", "url": "https://arxiv.org/pdf/1211.1671v1", "locator": "Original scoped contribution, statement/method and evidence limits; source-specific attribution retained." } ], "roles": [ { "who": "The named authors in the research record", "credit": "SCIENCE", "did": "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." } ], "target": { "record_id": "urn:uuid:49f6df89-57a7-49cd-a77c-e95938f2cb9f", "version": 1, "content_hash": "sha256:87d38ecae770b37d97e685070ceb104c721ea28cc584def842eca3e3b4c1f9c8" }, "scientific_correctness_certified": false, "independent_expert_calibration": false, "method": "PROPRIETARY", "points": "80000" }, "canonical_agent_submission": false, "scientific_verification_awarded": false, "reader_guide": null, "reading_status": "SOURCE_LINKED_NOTE" }