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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/25071
Title: Super-orbital variability of LS I +61°303 at TeV energies
Authors: Ahnen, M. L.
Ansoldi, S.
ANTONELLI, Lucio Angelo 
Antoranz, P.
Babic, A.
Banerjee, B.
Bangale, P.
Barres de Almeida, U.
Barrio, J. A.
Becerra González, J.
Bednarek, W.
Bernardini, E.
Biasuzzi, B.
Biland, A.
Blanch, O.
Bonnefoy, S.
Bonnoli, G.
Borracci, F.
Bretz, T.
Buson, S.
Carosi, A.
Chatterjee, A.
Clavero, R.
Colin, P.
Colombo, E.
Contreras, J. L.
Cortina, J.
COVINO, Stefano 
Da Vela, P.
Dazzi, F.
De Angelis, A.
De Lotto, B.
de Oña Wilhelmi, E.
Delgado Mendez, C.
Di Pierro, F.
Domínguez, A.
Dominis Prester, D.
Dorner, D.
Doro, M.
Einecke, S.
Eisenacher Glawion, D.
Elsaesser, D.
Fernández-Barral, A.
Fidalgo, D.
Fonseca, M. V.
Font, L.
Frantzen, K.
Fruck, C.
Galindo, D.
García López, R. J.
Garczarczyk, M.
Garrido Terrats, D.
Gaug, M.
Giammaria, P.
Godinović, N.
González Muñoz, A.
Gora, D.
Guberman, D.
Hadasch, D.
Hahn, A.
Hanabata, Y.
Hayashida, M.
Herrera, J.
Hose, J.
Hrupec, D.
Hughes, G.
Idec, W.
Kodani, K.
Konno, Y.
Kubo, H.
Kushida, J.
LA BARBERA, ANTONINO 
Lelas, D.
Lindfors, E.
Lombardi, S. 
Longo, F.
López, M.
López-Coto, R.
López-Oramas, A.
Majumdar, P.
Makariev, M.
Mallot, K.
Maneva, G.
Manganaro, M.
Mannheim, K.
Maraschi, L.
Marcote, B.
Mariotti, M.
Martínez, M.
Mazin, D.
Menzel, U.
Miranda, J. M.
Mirzoyan, R.
Moralejo, A.
Moretti, E.
Nakajima, D.
Neustroev, V.
Niedzwiecki, A.
Nievas Rosillo, M.
Nilsson, K.
Nishijima, K.
Noda, K.
Orito, R.
Overkemping, A.
Paiano, S.
Palacio, J.
Palatiello, M.
Paneque, D.
Paoletti, R.
Paredes, J. M.
Paredes-Fortuny, X.
Pedaletti, G.
PERSIC, Massimo 
Poutanen, J.
Prada Moroni, P. G.
PRANDINI, ELISA 
Puljak, I.
Rhode, W.
Ribó, M.
Rico, J.
Rodriguez Garcia, J.
Saito, T.
Satalecka, K.
Schultz, C.
Schweizer, T.
Shore, S. N.
Sillanpää, A.
Sitarek, J.
Snidaric, I.
Sobczynska, D.
STAMERRA, Antonio 
Steinbring, T.
Strzys, M.
Takalo, L.
Takami, H.
TAVECCHIO, Fabrizio 
Temnikov, P.
Terzić, T.
Tescaro, D.
Teshima, M.
Thaele, J.
Torres, D. F.
Toyama, T.
Treves, A.
Verguilov, V.
Vovk, I.
Ward, J. E.
Will, M.
Wu, M. H.
Zanin, R.
MAGIC Collaboration
Casares, J.
Herrero, A.
Issue Date: 2016
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 591
First Page: A76
Abstract: Context. The gamma-ray binary LS I +61°303 is a well-established source from centimeter radio up to very high energy (VHE; E> 100 GeV). The broadband emission shows a periodicity of ~26.5 days, coincident with the orbital period. A longer (super-orbital) period of 1667 ± 8 days was proposed from radio variability and confirmed using optical and high-energy (HE; E> 100 MeV) gamma-ray observations. In this paper, we report on a four-year campaign performed by MAGIC together with archival data concentrating on a search for a long-timescale signature in the VHE emission from LS I +61°303. Aims: We focus on the search for super-orbital modulation of the VHE emission, similar to that observed at other energies, and on the search for correlations between TeV emission and an optical determination of the extension of the circumstellar disk. Methods: A four-year campaign has been carried out using the MAGIC telescopes. The source was observed during the orbital phases when the periodic VHE outbursts have occurred (φ = 0.55-0.75, one orbit = 26.496 days). Additionally, we included archival MAGIC observations and data published by the VERITAS collaboration in these studies. For the correlation studies, LS I +61°303 has also been observed during the orbital phases where sporadic VHE emission had been detected in the past (φ = 0.75-1.0). These MAGIC observations were simultaneous with optical spectroscopy from the LIVERPOOL telescope. Results: The TeV flux of the periodical outburst in orbital phases φ = 0.5-0.75 was found to show yearly variability consistent with the long-term modulation of ~4.5 years found in the radio band. This modulation of the TeV flux can be well described by a sine function with a best-fit period of 1610 ± 58 days. The complete data, including archival observations, span two super-orbital periods. There is no evidence for a correlation between the TeV emission and the mass-loss rate of the Be star, but this may be affected by the strong, short-timescale (as short as intra-day) variation displayed by the Hα fluxes.
URI: http://hdl.handle.net/20.500.12386/25071
URL: https://www.aanda.org/articles/aa/abs/2016/07/aa27964-15/aa27964-15.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201527964
Bibcode ADS: 2016A&A...591A..76A
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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