Dr Anthony Brown anthony.brown@durham.ac.uk
Assistant Professor
Very high energy γ-ray emission from RBS 0679
Brown, Anthony M.; Chadwick, Paula M.; Landt, Hermine
Authors
Professor Paula Chadwick p.m.chadwick@durham.ac.uk
Head Of Department
Hermine Landt
Abstract
In this paper, we report the Fermi Large Area Telescope (LAT) detection of Very High Energy (VHE; Eγ > 100 GeV) γ-ray emission from the BL Lac object RBS 0679. 5.3 years of LAT observations revealed the presence of three VHE photon events within 0 ∘.1 of RBS 0679, with a subsequent unbinned likelihood analysis finding RBS 0679 to be a source of VHE photons at 6.9 standard deviations (σ). An unbinned likelihood analysis of the 0.1–100 GeV data, binned in 28-d periods, finds both the flux and spectral index to be variable, with a ‘softer-when-brighter’ trend in the global γ-ray characteristics. On the other hand, the 28-d periods in which the VHE photons were detected have spectral indices that are consistent with the 5.3 year average suggesting that the observed VHE emission is not associated with a spectral hardening event. The discovery of RBS 0679 in the 100–300 GeV energy range, combined with the non-detection above 390 GeV with the H.E.S.S. telescope array, suggest RBS 0679 to be an intriguing source that requires further follow-up observations with ground-based γ-ray observatories.
Citation
Brown, A. M., Chadwick, P. M., & Landt, H. (2014). Very high energy γ-ray emission from RBS 0679. Monthly Notices of the Royal Astronomical Society, 445(4), 4345-4350. https://doi.org/10.1093/mnras/stu2321
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 25, 2015 |
Publication Date | Dec 21, 2014 |
Deposit Date | Apr 10, 2015 |
Publicly Available Date | Apr 10, 2015 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 445 |
Issue | 4 |
Pages | 4345-4350 |
DOI | https://doi.org/10.1093/mnras/stu2321 |
Keywords | Radiation mechanisms: non-thermal galaxies: Active BL Lacertae objects: Individual: RBS 0679 galaxies: Jets gamma rays: galaxies |
Public URL | https://durham-repository.worktribe.com/output/1434406 |
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Copyright Statement
This article has been published in Monthly Notices of the Royal Astronomical Society © 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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