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The Astrophysical Journal Letters Volume 667 Number 1 Create an alert RSS this journal

J. Albert et al 2007 ApJ 667 L21 doi:10.1086/521982

Discovery of Very High Energy γ-Rays from 1ES 1011+496 at z = 0.212

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J. Albert1, E. Aliu2, H. Anderhub3, P. Antoranz4, A. Armada2, C. Baixeras5, J. A. Barrio4, H. Bartko6, D. Bastieri7, J. K. Becker8, W. Bednarek9, K. Berger1, C. Bigongiari7, A. Biland3, R. K. Bock6,7, P. Bordas10, V. Bosch-Ramon10, T. Bretz1, I. Britvitch3, M. Camara4, E. Carmona6, A. Chilingarian11, J. A. Coarasa6, S. Commichau3, J. L. Contreras4, J. Cortina2, M. T. Costado12,13, V. Curtef8, V. Danielyan11, F. Dazzi7, A. De Angelis14, C. Delgado12, R. de los Reyes4, B. De Lotto14, E. Domingo-Santamaría2, D. Dorner1, M. Doro7, M. Errando2, M. Fagiolini15, D. Ferenc16, E. Fernández2, R. Firpo2, J. Flix2, M. V. Fonseca4, L. Font5, M. Fuchs6, N. Galante6, R. J. García-López12,13, M. Garczarczyk6, M. Gaug12, M. Giller9, F. Goebel6, D. Hakobyan11, M. Hayashida6, T. Hengstebeck17, A. Herrero12,13, D. Höhne1, J. Hose6, C. C. Hsu6, P. Jacon9, T. Jogler6, R. Kosyra6, D. Kranich3, R. Kritzer1, A. Laille16, E. Lindfors18,19, S. Lombardi7, F. Longo14, J. López2, M. López4, E. Lorenz3,6, P. Majumdar6, G. Maneva20, K. Mannheim1, O. Mansutti14, M. Mariotti7, M. Martínez2, D. Mazin2,19, C. Merck6, M. Meucci15, M. Meyer1, J. M. Miranda4, R. Mirzoyan6, S. Mizobuchi6, A. Moralejo2, D. Nieto4, K. Nilsson18, J. Ninkovic6, E. Oña-Wilhelmi2, N. Otte6,17, I. Oya4, D. Paneque6, M. Panniello12,21, R. Paoletti15, J. M. Paredes10, M. Pasanen18, D. Pascoli7, F. Pauss3, R. Pegna15, E. Perlman22, M. Persic14,23, L. Peruzzo7, A. Piccioli15, E. Prandini7, N. Puchades2, A. Raymers11, W. Rhode8, M. Ribó10, J. Rico2, M. Rissi3, A. Robert5, S. Rügamer1, A. Saggion7, T. Saito6, A. Sánchez5, P. Sartori7, V. Scalzotto7, V. Scapin14, R. Schmitt1, T. Schweizer6, M. Shayduk6,17, K. Shinozaki6, S. N. Shore24, N. Sidro2, A. Sillanpää18, D. Sobczynska9, A. Stamerra15, L. S. Stark3, L. Takalo18, F. Tavecchio25, P. Temnikov20, D. Tescaro2, M. Teshima6, D. F. Torres26, N. Turini15, H. Vankov20, V. Vitale14, R. M. Wagner6, T. Wibig9, W. Wittek6, F. Zandanel7, R. Zanin2 and J. Zapatero5

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Abstract References Cited By

We report on the discovery of very high energy (VHE) γ-ray emission from the BL Lacertae object 1ES 1011+496. The observation was triggered by an optical outburst in 2007 March and the source was observed with the MAGIC telescope from 2007 March to May. Observing for 18.7 hr, we find an excess of 6.2 σ with an integrated flux above 200 GeV of (1.58 ± 0.32) × 10-11 photons cm-2 s-1. The VHE γ-ray flux is >40% higher than in 2006 March-April (reported elsewhere), indicating that the VHE emission state may be related to the optical emission state. We have also determined the redshift of 1ES 1011+496 based on an optical spectrum that reveals the absorption lines of the host galaxy. The redshift of z = 0.212 makes 1ES 1011+496 the most distant source observed to emit VHE γ-rays to date.


Subject headings

gamma rays: observations; quasars: individual (1ES 1011+496)


Dates

Issue 1 (2007 September 20)

Received 2007 June 29, accepted for publication 2007 July 30

Published 2007 September 4



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