Fermi large area telescope observations of blazar 3C 279 occultations by the sun
2014 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 784, no 2, 118- p.Article in journal (Refereed) Published
Observations of occultations of bright. gamma-ray sources by the Sun may reveal predicted pair halos around blazars and/or new physics, such as, e.g., hypothetical light dark matter particles-axions. We use Fermi Gamma-Ray Space Telescope (Fermi) data to analyze four occultations of blazar 3C 279 by the Sun on October 8 each year from 2008 to 2011. A combined analysis of the observations of these occultations allows a point-like source at the position of 3C 279 to be detected with significance of approximate to 3 sigma, but does not reveal any significant excess over the flux expected from the quiescent Sun. The likelihood ratio test rules out complete transparency of the Sun to the blazar. gamma-ray emission at a 3s confidence level.
Place, publisher, year, edition, pages
2014. Vol. 784, no 2, 118- p.
astroparticle physics, gamma rays: general, occultations, quasars: individual (3C 279), Sun: X-rays, gamma rays
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-146153DOI: 10.1088/0004-637X/784/2/118ISI: 000335519400033ScopusID: 2-s2.0-84896507688OAI: oai:DiVA.org:kth-146153DiVA: diva2:722962
QC 201406102014-06-102014-06-092014-06-10Bibliographically approved