Gamma-ray emission from high Galactic latitude globular clusters

被引：15
作者：
Lloyd, Sheridan J. [1 ]
Chadwick, Paula M. [1 ]
Brown, Anthony M. [1 ]
机构：
[1] Univ Durham, Ctr Adv Instrumentat, Dept Phys, South Rd, Durham DH1 3LE, England
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2018年 / 480卷 / 04期
基金：
英国科学技术设施理事会;
关键词：
astroparticle physics; pulsars: general; globular clusters: general; gamma-rays: general; LARGE-AREA TELESCOPE; MILLISECOND PULSARS; 47; TUCANAE; MILKY-WAY; NGC; 6752; FERMI; COUNTERPARTS; POPULATION; ORIGIN; MASSES;
D O I：
10.1093/mnras/sty2150
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We analyse 8 yr of PASS 8 Fermi-LAT data, in the 60 MeV-300 GeV energy range, from 30 high Galactic latitude globular clusters. Six of these globular clusters are detected with a TS > 25, with NGC 6254 being detected as gamma-ray bright for the first time. The most significant detection is of the well-known globular cluster 47 Tuc, and we produce a refined spectral fit for this object with a log parabola model. NGC 6093, NGC 6752, and NGC 6254 are fitted with hard, flat power-law models. NGC 7078 is best fitted with a soft power law, and NGC 6218 is best fitted with a hard, broken power law. This variety of spectral models suggests that there is a variety of gamma-ray source types within globular clusters, in addition to the traditional millisecond pulsar interpretation. We identify a correspondence between diffuse X-ray emission in globular cluster cores and gamma-ray emission. This connection suggests that gamma-ray emission in globular clusters could also arise from unresolved X-ray sources or a relativistic electron population, perhaps generated by the millisecond pulsars. X-ray observations of further gamma-ray bright globular clusters would allow a functional relationship to be determined between diffuse X-ray and gamma-ray emission.
引用
收藏
页码：4782 / 4796
页数：15
相关论文
共 51 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] Gamma-Ray Emission Concurrent with the Nova in the Symbiotic Binary V407 Cygni
    Abdo, A. A.
    Ackermann, M.
    Ajello, M.
    Atwood, W. B.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Blandford, R. D.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bouvier, A.
    Brandt, T. J.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Buehler, R.
    Burnett, T. H.
    Buson, S.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Carrigan, S.
    Casandjian, J. M.
    Cecchi, C.
    Celik, O.
    Charles, E.
    Chaty, S.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Conrad, J.
    Corbel, S.
    Corbet, R.
    DeCesar, M. E.
    den Hartog, P. R.
    Dermer, C. D.
    de Palma, F.
    Digel, S. W.
    Donato, D.
    do Couto e Silva, E.
    Drell, P. S.
    [J]. SCIENCE, 2010, 329 (5993) : 817 - 821
  • [3] Detection of High-Energy Gamma-Ray Emission from the Globular Cluster 47 Tucanae with Fermi
    Abdo, A. A.
    Ackermann, M.
    Ajello, M.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Blandford, R. D.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Caraveo, P. A.
    Casandjian, J. M.
    Cecchi, C.
    Celik, Oe
    Charles, E.
    Chaty, S.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cohen-Tanugi, J.
    Conrad, J.
    Cutini, S.
    Dermer, C. D.
    de Palma, F.
    Digel, S. W.
    Dormody, M.
    do Couto e Silva, E.
    Drell, P. S.
    Dubois, R.
    Dumora, D.
    Farnier, C.
    Favuzzi, C.
    Fegan, S. J.
    Focke, W. B.
    [J]. SCIENCE, 2009, 325 (5942) : 845 - 848
  • [4] A Population of Gamma-Ray Millisecond Pulsars Seen with the Fermi Large Area Telescope
    Abdo, A. A.
    Ackermann, M.
    Ajello, M.
    Atwood, W. B.
    Axelsson, M.
    Baldini, L.
    Ballet, J.
    Barbiellini, G.
    Baring, M. G.
    Bastieri, D.
    Baughman, B. M.
    Bechtol, K.
    Bellazzini, R.
    Berenji, B.
    Bignami, G. F.
    Blandford, R. D.
    Bloom, E. D.
    Bonamente, E.
    Borgland, A. W.
    Bregeon, J.
    Brez, A.
    Brigida, M.
    Bruel, P.
    Burnett, T. H.
    Caliandro, G. A.
    Cameron, R. A.
    Camilo, F.
    Caraveo, P. A.
    Carlson, P.
    Casandjian, J. M.
    Cecchi, C.
    Celik, Oe
    Charles, E.
    Chekhtman, A.
    Cheung, C. C.
    Chiang, J.
    Ciprini, S.
    Claus, R.
    Cognard, I.
    Cohen-Tanugi, J.
    Cominsky, L. R.
    Conrad, J.
    Corbet, R.
    Cutini, S.
    Dermer, C. D.
    Desvignes, G.
    de Angelis, A.
    de Luca, A.
    de Palma, F.
    Digel, S. W.
    [J]. SCIENCE, 2009, 325 (5942) : 848 - 852
  • [5] Abdo A. A, 2010, A A, V524, P11
  • [6] 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)
  • [7] Introducing the CTA concept
    Acharya, B. S.
    Actis, M.
    Aghajani, T.
    Agnetta, G.
    Aguilar, J.
    Aharonian, F.
    Ajello, M.
    Akhperjanian, A.
    Alcubierre, M.
    Aleksic, J.
    Alfaro, R.
    Aliu, E.
    Allafort, A. J.
    Allan, D.
    Allekotte, I.
    Amato, E.
    Anderson, J.
    Anguener, E. O.
    Antonelli, L. A.
    Antoranz, P.
    Aravantinos, A.
    Arlen, T.
    Armstrong, T.
    Arnaldi, H.
    Arrabito, L.
    Asano, K.
    Ashton, T.
    Asorey, H. G.
    Awane, Y.
    Baba, H.
    Babic, A.
    Baby, N.
    Baehr, J.
    Bais, A.
    Baixeras, C.
    Bajtlik, S.
    Balbo, M.
    Balis, D.
    Balkowski, C.
    Bamba, A.
    Bandiera, R.
    Barber, A.
    Barbier, C.
    Barcelo, M.
    Barnacka, A.
    Barnstedt, J.
    Barres de Almeida, U.
    Barrio, J. A.
    Basili, A.
    Basso, S.
    [J]. ASTROPARTICLE PHYSICS, 2013, 43 : 3 - 18
  • [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] STELLAR ENCOUNTER RATE IN GALACTIC GLOBULAR CLUSTERS
    Bahramian, Arash
    Heinke, Craig O.
    Sivakoff, Gregory R.
    Gladstone, Jeanette C.
    [J]. ASTROPHYSICAL JOURNAL, 2013, 766 (02)
  • [10] N-body modelling of globular clusters: masses, mass-to-light ratios and intermediate-mass black holes
    Baumgardt, H.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2017, 464 (02) : 2174 - 2202
123456