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Search for VHE gamma-ray emission from Geminga pulsar and nebula with the MAGIC telescopes | | M. L. Ahnen
; S. Ansoldi
; L. A. Antonelli
; P. Antoranz
; A. Babic
; B. Banerjee
; P. Bangale
; U. Barres de Almeida
; J. A. Barrio
; J. Becerra González
; W. Bednarek
; E. Bernardini
; B. Biasuzzi
; A. Bil
; O. Blanch
; S. Bonnefoy
; G. Bonnoli
; F. Borracci
; T. Bretz
; E. Carmona
; A. Carosi
; A. Chatterjee
; R. Clavero
; P. Colin
; E. Colombo
; J. L. Contreras
; J. Cortina
; S. Covino
; P. Da Vela
; F. Dazzi
; A. De Angelis
; B. De Lotto
; E. de O na Wilhelmi
; C. Delgado Mendez
; F. Di Pierro
; D. Dominis Prester
; D. Dorner
; M. Doro
; S. Einecke
; D. Eisenacher Glawion
; D. Elsaesser
; A. Fernández-Barral
; D. Fidalgo
; M. V. Fonseca
; L. Font
; K. Frantzen
; C. Fruck
; D. Galindo
; R. J. García López
; M. Garczarczyk
; D. Garrido Terrats
; M. Gaug
; P. Giammaria
; N. Godinovic
; A. González Muñoz
; D. Guberman
; A. Hahn
; Y. Hanabata
; M. Hayashida
; J. Herrera
; J. Hose
; D. Hrupec
; G. Hughes
; W. Idec
; K. Kodani
; Y. Konno
; H. Kubo
; J. Kushida
; A. La Barbera
; D. Lelas
; E. Lindfors
; S. Lombardi
; F. Longo
; M. López
; R. López-Coto
; A. López-Oramas
; E. Lorenz
; P. Majumdar
; M. Makariev
; K. Mallot
; G. Maneva
; M. Manganaro
; K. Mannheim
; L. Maraschi
; B. Marcote
; M. Mariotti
; M. Martínez
; D. Mazin
; U. Menzel
; J. M. Mira
; R. Mirzoyan
; A. Moralejo
; E. Moretti
; D. Nakajima
; V. Neustroev
; A. Niedzwiecki
; M. Nievas Rosillo
; K. Nilsson
; K. Nishijima
; K. Noda
; R. Orito
; A. Overkemping
; S. Paiano
; J. Palacio
; M. Palatiello
; D. Paneque
; R. Paoletti
; J. M. Paredes
; X. Paredes-Fortuny
; M. Persic
; J. Poutanen
; P. G. Prada Moroni
; E. Prini
; I. Puljak
; W. Rhode
; M. Ribó
; J. Rico
; J. Rodriguez Garcia
; T. Saito
; K. Satalecka
; C. Schultz
; T. Schweizer
; S. N. Shore
; A. Sillanpaa
; J. Sitarek
; I. Snidaric
; D. Sobczynska
; A. Stamerra
; T. Steinbring
; M. Strzys
; L. Takalo
; H. Takami
; F. Tavecchio
; P. Temnikov
; T. Terzic
; D. Tescaro
; M. Teshima
; J. Thaele
; D. F. Torres
; T. Toyama
; A. Treves
; V. Verguilov
; I. Vovk
; J. E. Ward
; M. Will
; M. H. Wu
; R. Zanin
; | | Date: |
2 Mar 2016 | | Abstract: | The Geminga pulsar, one of the brighest gamma-ray sources, is a promising
candidate for emission of very-high-energy (VHE > 100 GeV) pulsed gamma rays.
Also, detection of a large nebula have been claimed by water Cherenkov
instruments. We performed deep observations of Geminga with the MAGIC
telescopes, yielding 63 hours of good-quality data, and searched for emission
from the pulsar and pulsar wind nebula. We did not find any significant
detection, and derived 95% confidence level upper limits. The resulting upper
limits of 5.3 x 10^{-13} TeV cm^{-2} s^{-1} for the Geminga pulsar and 3.5 x
10^{-12} TeV cm^{-2} s^{-1} for the surrounding nebula at 50 GeV are the most
constraining ones obtained so far at VHE. To complement the VHE observations,
we also analyzed 5 years of Fermi-LAT data from Geminga, finding that the
sub-exponential cut-off is preferred over the exponential cut-off that has been
typically used in the literature. We also find that, above 10 GeV, the
gamma-ray spectra from Geminga can be described with a power law with index
softer than 5. The extrapolation of the power-law Fermi-LAT pulsed spectra to
VHE goes well below the MAGIC upper limits, indicating that the detection of
pulsed emission from Geminga with the current generation of Cherenkov
telescopes is very difficult. | | Source: | arXiv, 1603.0730 | | Services: | Forum | Review | PDF | Favorites | |
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