2016A&A...591A..76A


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET09:25:43

2016A&A...591A..76A - Astronomy and Astrophysics, volume 591A, 76-76 (2016/7-1)

Super-orbital variability of LS I +61 303 at TeV energies.

AHNEN M.L., ANSOLDI S., ANTONELLI L.A., ANTORANZ P., BABIC A., BANERJEE B., BANGALE P., BARRES DE ALMEIDA U., BARRIO J.A., BECERRA GONZALEZ 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 S., DA VELA P., DAZZI F., DE ANGELIS A., DE LOTTO B., DE ONA WILHELMI E., DELGADO MENDEZ C., DI PIERRO F., DOMINGUEZ A., DOMINIS PRESTER D., DORNER D., DORO M., EINECKE S., EISENACHER GLAWION D., ELSAESSER D., FERNANDEZ-BARRAL A., FIDALGO D., FONSECA M.V., FONT L., FRANTZEN K., FRUCK C., GALINDO D., GARCIA LOPEZ R.J., GARCZARCZYK M., GARRIDO TERRATS D., GAUG M., GIAMMARIA P., GODINOVIC N., GONZALEZ MUNOZ 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 A., LELAS D., LINDFORS E., LOMBARDI S., LONGO F., LOPEZ M., LOPEZ-COTO R., LOPEZ-ORAMAS A., MAJUMDAR P., MAKARIEV M., MALLOT K., MANEVA G., MANGANARO M., MANNHEIM K., MARASCHI L., MARCOTE B., MARIOTTI M., MARTINEZ 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 M., POUTANEN J., PRADA MORONI P.G., PRANDINI E., PULJAK I., RHODE W., RIBO M., RICO J., RODRIGUEZ GARCIA J., SAITO T., SATALECKA K., SCHULTZ C., SCHWEIZER T., SHORE S.N., SILLANPAA A., SITAREK J., SNIDARIC I., SOBCZYNSKA D., STAMERRA A., STEINBRING T., STRZYS M., TAKALO L., TAKAMI H., TAVECCHIO F., TEMNIKOV P., TERZIC 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., CASARES J. and HERRERO A.

Abstract (from CDS):

Context. The gamma-ray binary LS I +61°303 is a well-established source from centimeter radio up to very high energy (VHE; E>100GeV). 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>100MeV) 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.

Abstract Copyright: © ESO, 2016

Journal keyword(s): astroparticle physics - binaries: general - gamma rays: general - stars: individual: LS I +61 303 - X-rays: binaries - X-rays: individuals: LS I +61 303

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 LS I +61 303 HXB 02 40 31.6641883136 +61 13 45.591138110 11.27 11.61 10.75 10.19 9.55 B0Ve 775 2
2 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5704 4

    Equat.    Gal    SGal    Ecl

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