SAX J1808.4-3658, an accreting millisecond pulsar shining in gamma rays?

被引：9
作者：
de Ona Wilhelmi, E. [1 ]
Papitto, A. [1 ]
Li, J. [1 ]
Rea, N. [1 ,2 ]
Torres, D. F. [1 ,3 ]
Burderi, L. [4 ]
Di Salvo, T. [5 ]
Iaria, R. [5 ]
Riggio, A. [4 ]
Sanna, A. [4 ]
机构：
[1] Inst Space Sci CSIC IEEC, Campus UAB,Carrer Can Magrans S-N, Barcelona 08193, Spain
[2] Univ Amsterdam, Anton Pannekoek Inst Astron, Postbus 94249, NL-1090 GE Amsterdam, Netherlands
[3] ICREA, Barcelona 08010, Spain
[4] Univ Cagliari, Dipartimento Fis, KM 0-7, I-09042 Monserrato, Italy
[5] Univ Palermo, Dipartimento Fis & Chim, Via Archirafi 36, I-90123 Palermo, Italy
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 456卷 / 03期
基金：
中国国家自然科学基金;
关键词：
stars: individual: SAX J1808.4-3658; stars: neutron; gamma-rays: stars; LARGE-AREA TELESCOPE; BINARY PSR J1023+0038; XSS J12270-4859; OPTICAL COUNTERPART; ORBITAL EVOLUTION; RADIO PULSARS; STATE CHANGE; SKY SURVEY; EMISSION; SAX-J1808.4-3658;
D O I：
10.1093/mnras/stv2695
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the detection of a possible gamma-ray counterpart of the accreting millisecond pulsar SAX J1808.4-3658. The analysis of similar to 6 yr of data from the Large Area Telescope on board the Fermi gamma-ray Space Telescope (Fermi-LAT) within a region of 15. radius around the position of the pulsar reveals a point gamma-ray source detected at a significance of similar to 6 sigma (test statistic TS = 32), with a position compatible with that of SAX J1808.4-3658 within the 95 per cent confidence level. The energy flux in the energy range between 0.6 and 10 GeV amounts to (2.1 +/- 0.5) x 10(-12) erg cm(-2) s(-1) and the spectrum is represented well by a power-law function with photon index 2.1 +/- 0.1. We searched for significant variation of the flux at the spin frequency of the pulsar and for orbital modulation, taking into account the trials due to the uncertainties in the position, the orbital motion of the pulsar and the intrinsic evolution of the pulsar spin. No significant deviation from a constant flux at any time-scale was found, preventing a firm identification via time variability. Nonetheless, the association of the LAT source as the gamma-ray counterpart of SAX J1808.4-3658 would match the emission expected from the millisecond pulsar, if it switches on as a rotation-powered source during X-ray quiescence.
引用
收藏
页码：2647 / 2653
页数：7
相关论文
共 53 条
  • [1] THE SECOND FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS
    Abdo, A. A.
    Ajello, M.
    Allafort, A.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Baring, M. G.
    Bastieri, D.
    Belfiore, A.
    Bellazzini, R.
    Bhattacharyya, B.
    Bissaldi, E.
    Bloom, E. D.
    Bonamente, E.
    Bottacini, E.
    Brandt, T. J.
    Bregeon, J.
    Brigida, M.
    Bruel, P.
    Buehler, R.
    Burgay, M.
    Burnett, T. H.
    Busetto, G.
    Buson, S.
    Caliandro, G. A.
    Cameron, R. A.
    Camilo, F.
    Caraveo, P. A.
    Casandjian, J. M.
    Cecchi, C.
    Celik, Oe .
    Charles, E.
    Chaty, S.
    Chaves, R. C. G.
    Chekhtman, A.
    Chen, A. W.
    Chiang, J.
    Chiaro, G.
    Ciprini, S.
    Claus, R.
    Cognard, I.
    Cohen-Tanugi, J.
    Cominsky, L. R.
    Conrad, J.
    Cutini, S.
    D'Ammando, F.
    De Angelis, A.
    DeCesar, M. E.
    De Luca, A.
    Den Hartog, P. R.
    [J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2013, 208 (02)
  • [2] The on-orbit calibration of the Fermi Large Area Telescope
    Abdo, A. A.
    Ackermann, M.
    Ajello, M.
    Ampe, J.
    Anderson, B.
    Atwood, W. B.
    Axelsson, M.
    Bagagli, R.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bartelt, J.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bederede, D.
    Bellardi, F.
    Bellazzini, R.
    Belli, F.
    Berenji, B.
    Bisello, D.
    Bissaldi, E.
    Bloom, E. D.
    Bogaert, G.
    Bogart, J. R.
    Bonamente, E.
    Borgland, A. W.
    Bourgeois, P.
    Bouvier, A.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Busetto, G.
    Caliandro, G. A.
    Cameron, R. A.
    Campell, M.
    Caraveo, P. A.
    Carius, S.
    Carlson, P.
    Casandjian, J. M.
    Cavazzuti, E.
    Ceccanti, M.
    Cecchi, C.
    Charles, E.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Chipaux, R.
    [J]. ASTROPARTICLE PHYSICS, 2009, 32 (3-4) : 193 - 219
  • [3] FERMI LARGE AREA TELESCOPE THIRD SOURCE CATALOG
    Acero, F.
    Ackermann, M.
    Ajello, M.
    Albert, A.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Belfiore, A.
    Bellazzini, R.
    Bissaldi, E.
    Blandford, R. D.
    Bloom, E. D.
    Bogart, J. R.
    Bonino, R.
    Bottacini, E.
    Bregeon, J.
    Britto, R. J.
    Bruel, P.
    Buehler, R.
    Burnett, T. H.
    Buson, S.
    Caliandro, G. A.
    Cameron, R. A.
    Caputo, R.
    Caragiulo, M.
    Caraveo, P. A.
    Casandjian, J. M.
    Cavazzuti, E.
    Charles, E.
    Chaves, R. C. G.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Chiaro, G.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Cominsky, L. R.
    Conrad, J.
    Cutini, S.
    D'Ammando, F.
    de Angelis, A.
    DeKlotz, M.
    de Palma, F.
    Desiante, R.
    Digel, S. W.
    Di Venere, L.
    [J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2015, 218 (02)
  • [4] A NEW CLASS OF RADIO PULSARS
    ALPAR, MA
    CHENG, AF
    RUDERMAN, MA
    SHAHAM, J
    [J]. NATURE, 1982, 300 (5894) : 728 - 730
  • [5] [Anonymous], 2010, THESIS U WASHINGTON
  • [6] Archibald A. M., 2014, APJ, V807, P62
  • [7] A Radio Pulsar/X-ray Binary Link
    Archibald, Anne M.
    Stairs, Ingrid H.
    Ransom, Scott M.
    Kaspi, Victoria M.
    Kondratiev, Vladislav I.
    Lorimer, Duncan R.
    McLaughlin, Maura A.
    Boyles, Jason
    Hessels, Jason W. T.
    Lynch, Ryan
    van Leeuwen, Joeri
    Roberts, Mallory S. E.
    Jenet, Frederick
    Champion, David J.
    Rosen, Rachel
    Barlow, Brad N.
    Dunlap, Bart H.
    Remillard, Ronald A.
    [J]. SCIENCE, 2009, 324 (5933) : 1411 - 1414
  • [8] THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
    Atwood, W. B.
    Abdo, A. A.
    Ackermann, M.
    Althouse, W.
    Anderson, B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Band, D. L.
    Barbiellini, G.
    Bartelt, J.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bederede, D.
    Bellardi, F.
    Bellazzini, R.
    Berenji, B.
    Bignami, G. F.
    Bisello, D.
    Bissaldi, E.
    Blandford, R. D.
    Bloom, E. D.
    Bogart, J. R.
    Bonamente, E.
    Bonnell, J.
    Borgland, A. W.
    Bouvier, A.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Busetto, G.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Carius, S.
    Carlson, P.
    Casandjian, J. M.
    Cavazzuti, E.
    Ceccanti, M.
    Cecchi, C.
    Charles, E.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Chipaux, R.
    Cillis, A. N.
    Ciprini, S.
    [J]. ASTROPHYSICAL JOURNAL, 2009, 697 (02) : 1071 - 1102
  • [9] A state change in the low-mass X-ray binary XSS J12270-4859
    Bassa, C. G.
    Patruno, A.
    Hessels, J. W. T.
    Keane, E. F.
    Monard, B.
    Mahony, E. K.
    Bogdanov, S.
    Corbel, S.
    Edwards, P. G.
    Archibald, A. M.
    Janssen, G. H.
    Stappers, B. W.
    Tendulkar, S.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 441 (02) : 1825 - 1830
  • [10] Beckmann V., 2014, 40 COSPAR SCI ASS MO, P239
123456