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ASSOCIATING LONG-TERM gamma-RAY VARIABILITY WITH THE SUPERORBITAL PERIOD OF LS I+61 degrees 303
Ackermann, M; Ajello, M; Ballet, J; Barbiellini, G; Bastieri, D; Bellazzini, R; Bonamente, E; Brandt, TJ; Bregeon, J; Brigida, M; Bruel, P; Buehler, R; Buson, S; Caliandro, GA; Cameron, RA; Caraveo, PA; Casandjian, JM; Cavazzuti, E; Cecchi, C; Chekhtman, A; Chiang, J; Chiaro, G; Ciprini, S; Claus, R; Cohen-Tanugi, J; Cominsky, LR; Conrad, J; Cutini, S; Dalton, M; D'Ammando, F; de Angelis, A; Den Hartog, PR; de Palma, F; Dermer, CD; Digel, SW; Di Venere, L; Drell, PS; Dubois, R; Favuzzi, C; Fegan, SJ; Ferrara, EC; Focke, WB; Franckowiak, A; Funk, S; Fusco, P; Gargano, F; Gasparrini, D; Germani, S; Giglietto, N; Giordano, F; Giroletti, M; Glanzman, T; Godfrey, G; Grenier, IA; Guiriec, S; Hadasch, D; Hanabata, Y; Harding, AK; Hayashida, M; Hays, E; Hill, AB; Horan, D; Hughes, RE; Jogler, T; Johannesson, G; Johnson, AS; Johnson, TJ; Kawano, T; Kerr, M; Knodlseder, J; Kuss, M; Lande, J; Larsson, S; Latronico, L; Lemoine-Goumard, M; Li, J; Longo, F; Lovellette, MN; Lubrano, P; Mayer, M; Mazziotta, MN; McEnery, JE; Michelson, PF; Mizuno, T; Monzani, ME; Morselli, A; Moskalenko, IV; Murgia, S; Nemmen, R; Nuss, E; Ohsugi, T; Okumura, A; Orienti, M; Orlando, E; Ormes, JF; Paneque, D; Papitto, A; Perkins, JS; Pesce-Rollins, M; Piron, F; Pivato, G; Raino, S; Rando, R; Razzano, M; Rea, N; Reimer, A; Reimer, O; Scargle, JD; Schulz, A; Sgro, C; Siskind, EJ; Spandre, G; Spinelli, P; Takahashi, H; Thayer, JG; Thayer, JB; Tinivella, M; Torres, DF; Tosti, G; Troja, E; Uchiyama, Y; Usher, TL; Vandenbroucke, J; Vasileiou, V; Vianello, G; Vitale, V; Werner, M; Winer, BL; Wood, KS; Li J(李剑)
2013
发表期刊ASTROPHYSICAL JOURNAL LETTERS
卷号773期号:2页码:L35
摘要Gamma-ray binaries are stellar systems for which the spectral energy distribution (discounting the thermal stellar emission) peaks at high energies. Detected from radio to TeV gamma rays, the gamma-ray binary LS I + 61 degrees 303 is highly variable across all frequencies. One aspect of this system's variability is the modulation of its emission with the timescale set by the similar to 26.4960 day orbital period. Here we show that, during the time of our observations, the gamma-ray emission of LS I + 61 degrees 303 also presents a sinusoidal variability consistent with the previously known superorbital period of 1667 days. This modulation is more prominently seen at orbital phases around apastron, whereas it does not introduce a visible change close to periastron. It is also found in the appearance and disappearance of variability at the orbital period in the power spectrum of the data. This behavior could be explained by a quasi-cyclical evolution of the equatorial outflow of the Be companion star, whose features influence the conditions for generating gamma rays. These findings open the possibility to use gamma-ray observations to study the outflows of massive stars in eccentric binary systems.
关键词gamma rays: general gamma rays: stars stars: emission-line, Be
学科领域Astronomy & Astrophysics
DOI10.1088/2041-8205/773/2/L35
收录类别SCI
WOS记录号WOS:000322899600018
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被引频次:20[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224739
专题粒子天体物理中心
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Ackermann, M,Ajello, M,Ballet, J,et al. ASSOCIATING LONG-TERM gamma-RAY VARIABILITY WITH THE SUPERORBITAL PERIOD OF LS I+61 degrees 303[J]. ASTROPHYSICAL JOURNAL LETTERS,2013,773(2):L35.
APA Ackermann, M.,Ajello, M.,Ballet, J.,Barbiellini, G.,Bastieri, D.,...&李剑.(2013).ASSOCIATING LONG-TERM gamma-RAY VARIABILITY WITH THE SUPERORBITAL PERIOD OF LS I+61 degrees 303.ASTROPHYSICAL JOURNAL LETTERS,773(2),L35.
MLA Ackermann, M,et al."ASSOCIATING LONG-TERM gamma-RAY VARIABILITY WITH THE SUPERORBITAL PERIOD OF LS I+61 degrees 303".ASTROPHYSICAL JOURNAL LETTERS 773.2(2013):L35.
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