AGILE detects enhanced gamma-ray activity from the radio galaxy NGC 1275 region

ATel #7239; F. Verrecchia, F. Lucarelli (ASDC and INAF/OAR), A. Bulgarelli (INAF/IASF-Bo), C. Pittori (ASDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), V. Fioretti (INAF/IASF-Bo), G. Piano (INAF/IAPS), S. Vercellone (INAF/IASF-Pa), E. Striani (CIFS and INAF/IAPS), I. Donnarumma (INAF/IAPS), M. Cardillo (INAF/OA-Arcetri and INAF/IAPS), F. Gianotti, M. Trifoglio (INAF/IASF-Bo), A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), A. Chen (Wits University), A. Argan, E. Costa, E. Del Monte, Y. Evangelista, M. Feroci, F. Lazzarotto, I. Lapshov, L. Pacciani, P. Soffitta, S. Sabatini, V. Vittorini (INAF/IAPS), G. Pucella, M. Rapisarda (ENEA-Frascati), G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, M. Marisaldi (INAF/IASF-Bo), A. Pellizzoni, A. Trois (INAF/OA-Cagliari), M. Pilia (ASTRON, the Netherlands), G. Barbiellini, E. Vallazza (INFN Trieste), F. Longo (Univ. Trieste and INFN Trieste), A. Morselli, P. Picozza (INFN and Univ. Roma Tor Vergata), M. Prest (Univ. dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), S. Colafrancesco (INAF/OAR and Wits University), N. Parmiggiani (University of Modena and Reggio Emilia), A. Ferrari (Univ. Torino and CIFS), P. Giommi (ASDC), L. Salotti, G. Valentini, and F. D'Amico (ASI)
on 17 Mar 2015; 17:03 UT
Credential Certification: Francesco Verrecchia (francesco.verrecchia@asdc.asi.it)

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The AGILE satellite detects gamma-ray activity from a position consistent with the radio galaxy NGC 1275 (also known as 1AGLR J0321+4137, Verrecchia et al. 2013, A&A, 558, 137, 3FGL J0319.8+4130, Acero et al. 2015, and Perseus A).

A maximum likelihood analysis of the AGILE-GRID data for the integration period between 2015-03-15 04:00 UT and 2015-03-17 07:30 UT, yields a significance above 5 sigma and a flux F=(2.7 +/- 0.9)x 10^-6 ph/cm^-2/s^-1 (E > 100 MeV), at Galactic coordinates (l, b) = (150.57,-12.58) +/- 0.7 deg (95% stat. c.l.) +/- 0.1 deg (syst.) (R.A.: 50.45, Dec: 42.08).

This flux corresponds to an increase of about 10 with respect to the maximum flux for 1AGLR J0321+4137 reported in Verrecchia et al. 2013.

Flaring gamma-ray activity from a position consistent with this source was previously reported by Fermi/LAT (ATel #4753, #2737).

This measurement was obtained with AGILE observing a large portion of the sky in spinning mode.

Multifrequency observations of the source are strongly encouraged.