Discovery of transient high-energy γ-ray emission from the BL Lacertae object 5C 3.178

H. Dickinson, C. Farnier

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We report the serendipitous discovery of transient, point-like high energy γ-ray emission coincident with the position of the suspected BL Lac object 5C 3.178. The source was detected using the Fermi Large Area Telescope (LAT) at a significance level of ~8σ during a 200 day period which began on November 17th 2011 (MJD 55 882). The observed γ-ray emission is characterised by a moderate 0.2-300 GeV flux F0.2-300 GeV = (8.22 ± 2.04) × 10-9 ph cm-2 s-1 and a hard power law spectrum with spectral index Γ = 1.76 ± 0.09. These properties appear consistent with the known sub-population of TeV γ-ray-emitting BL Lac objects, implying that the source may be detectable using atmospheric Cherenkov telescope arrays. Moreover, the temporal variability of the source suggests that real-time searches of the Fermi-LAT all-sky dataset for weak emission on ∼200 day timescales may represent a rewarding strategy.

Original languageEnglish (US)
Article numberA134
JournalAstronomy and Astrophysics
Volume552
DOIs
StatePublished - 2013

Bibliographical note

Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.

Keywords

  • Astroparticle physics
  • BL Lacertae objects: individual: 5C 3.178
  • Gamma rays: galaxies

Fingerprint Dive into the research topics of 'Discovery of transient high-energy γ-ray emission from the BL Lacertae object 5C 3.178'. Together they form a unique fingerprint.

Cite this