New Method for Investigating the Presence of Extragalactic Magnetic Fields.
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| Title: | New Method for Investigating the Presence of Extragalactic Magnetic Fields. |
|---|---|
| Authors: | Stern, B.1 (AUTHOR) stern@inr.ru, Tkachev, I.1,2 (AUTHOR) |
| Source: | JETP Letters. Feb2026, Vol. 123 Issue 4, p224-230. 7p. |
| Subjects: | Cosmic magnetic fields, Gamma rays, Gamma ray astronomy, Active galactic nuclei, Astrophysics |
| Abstract: | The extragalactic magnetic field could be detected by searching for signatures of the electromagnetic cascade initiated by high-energy photons on the intergalactic radiation and deflected by the field. This process produces a time delay and an extended gamma-ray halo around the source, which are looked for. We propose a new signature of electromagnetic echoes: the asymmetry of the gamma-ray distribution around blazars. As a measure of asymmetry, we use the offset of the gamma-ray distribution to the location of the blazar. This offset is due to the tilt of the jet of the blazar relative to the line of sight. Using a subsample of the ten brightest BL Lacs, we exclude the range of extragalactic magnetic fields from 10–16 to 10–14 G, assuming that these objects have maintained a constant average luminosity over hundreds of thousands of years. [ABSTRACT FROM AUTHOR] |
| Copyright of JETP Letters is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 192617885 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: New Method for Investigating the Presence of Extragalactic Magnetic Fields. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Stern%2C+B%2E%22">Stern, B.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> stern@inr.ru</i><br /><searchLink fieldCode="AR" term="%22Tkachev%2C+I%2E%22">Tkachev, I.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22JETP+Letters%22">JETP Letters</searchLink>. Feb2026, Vol. 123 Issue 4, p224-230. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Cosmic+magnetic+fields%22">Cosmic magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Gamma+rays%22">Gamma rays</searchLink><br /><searchLink fieldCode="DE" term="%22Gamma+ray+astronomy%22">Gamma ray astronomy</searchLink><br /><searchLink fieldCode="DE" term="%22Active+galactic+nuclei%22">Active galactic nuclei</searchLink><br /><searchLink fieldCode="DE" term="%22Astrophysics%22">Astrophysics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The extragalactic magnetic field could be detected by searching for signatures of the electromagnetic cascade initiated by high-energy photons on the intergalactic radiation and deflected by the field. This process produces a time delay and an extended gamma-ray halo around the source, which are looked for. We propose a new signature of electromagnetic echoes: the asymmetry of the gamma-ray distribution around blazars. As a measure of asymmetry, we use the offset of the gamma-ray distribution to the location of the blazar. This offset is due to the tilt of the jet of the blazar relative to the line of sight. Using a subsample of the ten brightest BL Lacs, we exclude the range of extragalactic magnetic fields from 10–16 to 10–14 G, assuming that these objects have maintained a constant average luminosity over hundreds of thousands of years. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of JETP Letters is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1134/S0021364025609820 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 224 Subjects: – SubjectFull: Cosmic magnetic fields Type: general – SubjectFull: Gamma rays Type: general – SubjectFull: Gamma ray astronomy Type: general – SubjectFull: Active galactic nuclei Type: general – SubjectFull: Astrophysics Type: general Titles: – TitleFull: New Method for Investigating the Presence of Extragalactic Magnetic Fields. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Stern, B. – PersonEntity: Name: NameFull: Tkachev, I. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 02 Text: Feb2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00213640 Numbering: – Type: volume Value: 123 – Type: issue Value: 4 Titles: – TitleFull: JETP Letters Type: main |
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