Discovery of GeV emission from the Circinus galaxy with the Fermi Large Area Telescope [Discovery of GeV emission from the Circinus galaxy with the Fermi-LAT]

Hayashida, Masaaki; Stawarz, Łukasz; Cheung, Chi C.; Bechtol, Keith; Madejski, Greg M.; Ajello, Marco; Massaro, Francesco; Moskalenko, Igor V.; Strong, Andrew; Tibaldo, Luigi

doi:10.1088/0004-637X/779/2/131

Title: Discovery of GeV emission from the Circinus galaxy with the Fermi Large Area Telescope [Discovery of GeV emission from the Circinus galaxy with the Fermi-LAT]

Journal Article · Tue Dec 03 00:00:00 EST 2013 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/779/2/131· OSTI ID:1356548

Hayashida, Masaaki ^[1]; Stawarz, Łukasz ^[2]; Cheung, Chi C. ^[3]; Bechtol, Keith ^[4]; Madejski, Greg M. ^[5]; Ajello, Marco ^[6]; Massaro, Francesco ^[5]; Moskalenko, Igor V. ^[5]; Strong, Andrew ^[7]; Tibaldo, Luigi ^[5]

Univ. of Tokyo, Chiba (Japan); Stanford Univ., Stanford, CA (United States). SLAC National Accelerator Lab.
Institute of Space and Astronomical Science, Kanagawa (Japan); Jagiellonian Univ., Krakow (Poland)
Naval Research Lab., Washington, D.C. (United States)
Univ. of Chicago, Chicago, IL (United States)
Stanford, CA (United States). SLAC National Accelerator Lab
Univ. of California, Berkeley, CA (United States)
Max-Planck Institut fur extraterrestrische Physik, Garching (Germany)

We report the discovery of γ-ray emission from the Circinus galaxy using the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. Circinus is a nearby (~4 Mpc) starburst with a heavily obscured Seyfert-type active nucleus, bipolar radio lobes perpendicular to the spiral disk, and kpc-scale jet-like structures. Our analysis of 0.1-100 GeV events collected during 4 yr of LAT observations reveals a significant (≃ 7.3σ) excess above the background. We find no indications of variability or spatial extension beyond the LAT point-spread function. A power-law model used to describe the 0.1-100 GeV γ-ray spectrum yields a flux of (18.8 ± 5.8) × 10^–9 photon cm^–2 s^–1 and photon index 2.19 ± 0.12, corresponding to an isotropic γ-ray luminosity of 3 × 10⁴⁰ erg s^–1. This observed γ-ray luminosity exceeds the luminosity expected from cosmic-ray interactions in the interstellar medium and inverse Compton radiation from the radio lobes. Furthermore, the origin of the GeV excess requires further investigation.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356548

Journal Information:: The Astrophysical Journal, Vol. 779, Issue 2; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 41 works

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Title: Discovery of GeV emission from the Circinus galaxy with the Fermi Large Area Telescope [Discovery of GeV emission from the Circinus galaxy with the Fermi-LAT]

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