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. 2016 Apr 22;116(16):161101.
doi: 10.1103/PhysRevLett.116.161101. Epub 2016 Apr 20.

Search for Spectral Irregularities Due to Photon-Axionlike-Particle Oscillations With the Fermi Large Area Telescope

M Ajello  1 A Albert  2 B Anderson  3   4 L Baldini  2   5 G Barbiellini  6   7 D Bastieri  8   9 R Bellazzini  10 E Bissaldi  11 R D Blandford  2 E D Bloom  2 R Bonino  12   13 E Bottacini  2 J Bregeon  14 P Bruel  15 R Buehler  16 G A Caliandro  2   17 R A Cameron  2 M Caragiulo  11   18 P A Caraveo  19 C Cecchi  20   21 A Chekhtman  22 S Ciprini  20   23 J Cohen-Tanugi  14 J Conrad  3   4 F Costanza  11 F D'Ammando  24   25 A de Angelis  26 F de Palma  11   27 R Desiante  12   28 M Di Mauro  2 L Di Venere  11   18 A Domínguez  1 P S Drell  2 C Favuzzi  11   18 W B Focke  2 A Franckowiak  2 Y Fukazawa  29 S Funk  30 P Fusco  11   18 F Gargano  11 D Gasparrini  20   23 N Giglietto  11   18 T Glanzman  2 G Godfrey  2 S Guiriec  31 D Horan  15 G Jóhannesson  32 M Katsuragawa  33 S Kensei  29 M Kuss  10 S Larsson  4   34 L Latronico  12 J Li  35 L Li  4   34 F Longo  6   7 F Loparco  11   18 P Lubrano  20 G M Madejski  2 S Maldera  12 A Manfreda  10 M Mayer  16 M N Mazziotta  11 M Meyer  3   4 P F Michelson  2 N Mirabal  31 T Mizuno  36 M E Monzani  2 A Morselli  37 I V Moskalenko  2 S Murgia  38 M Negro  12   13 E Nuss  14 C Okada  29 E Orlando  2 J F Ormes  39 D Paneque  2   40 J S Perkins  31 M Pesce-Rollins  2   10 F Piron  14 G Pivato  10 T A Porter  2 S Rainò  11   18 R Rando  8   9 M Razzano  10 A Reimer  2   41 M Sánchez-Conde  3   4 C Sgrò  10 D Simone  11 E J Siskind  42 F Spada  10 G Spandre  10 P Spinelli  11   18 H Takahashi  29 J B Thayer  2 D F Torres  35   43 G Tosti  20   21 E Troja  31   44 Y Uchiyama  45 K S Wood  46 M Wood  2 G Zaharijas  47   48 S Zimmer  3   4 Fermi-LAT Collaboration
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Search for Spectral Irregularities Due to Photon-Axionlike-Particle Oscillations With the Fermi Large Area Telescope

M Ajello et al. Phys Rev Lett. .

Abstract

We report on the search for spectral irregularities induced by oscillations between photons and axionlike-particles (ALPs) in the γ-ray spectrum of NGC 1275, the central galaxy of the Perseus cluster. Using 6 years of Fermi Large Area Telescope data, we find no evidence for ALPs and exclude couplings above 5×10^{-12} GeV^{-1} for ALP masses 0.5≲m_{a}≲5 neV at 95% confidence. The limits are competitive with the sensitivity of planned laboratory experiments, and, together with other bounds, strongly constrain the possibility that ALPs can reduce the γ-ray opacity of the Universe.

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