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Discovery of transient high-energy gamma-ray emission from the BL Lacertae object 5C 3.178
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
2013 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 552, A134- p.Article in journal (Refereed) Published
Abstract [en]

We report the serendipitous discovery of transient, point-like high energy gamma-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 similar to 8 sigma during a 200 day period which began on November 17th 2011 (MJD 55 882). The observed gamma-ray emission is characterised by a moderate 0.2-300 GeV flux F0.2-300 (GeV) = (8.22 +/- 2.04) x 10(-9) ph cm(-2) s(-1) and a hard power law spectrum with spectral index Gamma = 1.76 +/- 0.09. These properties appear consistent with the known sub-population of TeV gamma-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 similar to 200 day timescales may represent a rewarding strategy.

Place, publisher, year, edition, pages
2013. Vol. 552, A134- p.
Keyword [en]
astroparticle physics, BL Lacertae objects: individual: 5C 3.178, gamma rays: galaxies
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-90374DOI: 10.1051/0004-6361/201321287ISI: 000317912000133OAI: oai:DiVA.org:su-90374DiVA: diva2:627684
Note

AuthorCount:2;

Available from: 2013-06-12 Created: 2013-06-03 Last updated: 2017-12-06Bibliographically approved

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Dickinson, HughFarnier, Christian
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