Strong Support for the Millisecond Pulsar Origin of the Galactic Center GeV Excess

被引：254

作者：

Bartels, Richard ^{[1
]}

Krishnamurthy, Suraj ^{[1
]}

Weniger, Christoph ^{[1
]}

机构：

[1] Univ Amsterdam, GRAPPA Inst, Sci Pk 904, NL-1090 GL Amsterdam, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 05期

基金：

美国国家科学基金会;

关键词：

LARGE-AREA TELESCOPE; GAMMA-RAY EMISSION; POPULATION; BUBBLES; CATALOG; GALAXY; SIGNAL;

D O I：

10.1103/PhysRevLett.116.051102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using gamma-ray data from the Fermi Large Area Telescope, various groups have identified a clear excess emission in the Inner Galaxy, at energies around a few GeV. This excess resembles remarkably well a signal from dark-matter annihilation. One of the most compelling astrophysical interpretations is that the excess is caused by the combined effect of a previously undetected population of dim gamma-ray sources. Because of their spectral similarity, the best candidates are millisecond pulsars. Here, we search for this hypothetical source population, using a novel approach based on wavelet decomposition of the gamma-ray sky and the statistics of Gaussian random fields. Using almost seven years of Fermi-LAT data, we detect a clustering of photons as predicted for the hypothetical population of millisecond pulsar, with a statistical significance of 10.0 sigma. For plausible values of the luminosity function, this population explains 100% of the observed excess emission. We argue that other extragalactic or Galactic sources, a mismodeling of Galactic diffuse emission, or the thick-disk population of pulsars are unlikely to account for this observation.

引用

页数：5

共 44 条

[1] A COMBINED MAXIMUM-LIKELIHOOD ANALYSIS OF THE HIGH-ENERGY ASTROPHYSICAL NEUTRINO FLUX MEASURED WITH ICECUBE [J].

Aartsen, M. G. ;

Abraham, K. ;

Ackermann, M. ;

Adams, J. ;

Aguilar, J. A. ;

Ahlers, M. ;

Ahrens, M. ;

Altmann, D. ;

Anderson, T. ;

Archinger, M. ;

Arguelles, C. ;

Arlen, T. C. ;

Auffenberg, J. ;

Bai, X. ;

Barwick, S. W. ;

Baum, V. ;

Bay, R. ;

Beatty, J. J. ;

Tjus, J. Becker ;

Becker, K. -H. ;

Beiser, E. ;

BenZvi, S. ;

Berghaus, P. ;

Berley, D. ;

Bernardini, E. ;

Bernhard, A. ;

Besson, D. Z. ;

Binder, G. ;

Bindig, D. ;

Bissok, M. ;

Blaufuss, E. ;

Blumenthal, J. ;

Boersma, D. J. ;

Bohm, C. ;

Boerner, M. ;

Bos, F. ;

Bose, D. ;

Boeser, S. ;

Botner, O. ;

Braun, J. ;

Brayeur, L. ;

Bretz, H. -P. ;

Brown, A. M. ;

Buzinsky, N. ;

Casey, J. ;

Casier, M. ;

Cheung, E. ;

Chirkin, D. ;

Christov, A. ;

Christy, B. .

ASTROPHYSICAL JOURNAL, 2015, 809 (01)

[2] Astrophysical and dark matter interpretations of extended gamma-ray emission from the Galactic Center [J].

Abazajian, Kevork N. ;

Canac, Nicolas ;

Horiuchi, Shunsaku ;

Kaplinghat, Manoj .

PHYSICAL REVIEW D, 2014, 90 (02)

[3] Detection of a gamma-ray source in the Galactic Center consistent with extended emission from dark matter annihilation and concentrated astrophysical emission [J].

Abazajian, Kevork N. ;

Kaplinghat, Manoj .

PHYSICAL REVIEW D, 2012, 86 (08)

[4] The consistency of Fermi-LAT observations of the galactic center with a millisecond pulsar population in the central stellar cluster [J].

Abazajian, Kevork N. .

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2011, (03)

[5] THE SECOND FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS [J].

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. .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2013, 208 (02)

[6]

Acero F., 2003, ASTROPHYS S IN PRESS

[7] Planck 2013 results. XXVIII. The Planck Catalogue of Compact Sources [J].

Ade, P. A. R. ;

Aghanim, N. ;

Argueeso, F. ;

Armitage-Caplan, C. ;

Arnaud, M. ;

Ashdown, M. ;

Atrio-Barandela, F. ;

Aumont, J. ;

Baccigalupi, C. ;

Banday, A. J. ;

Barreiro, R. B. ;

Bartlett, J. G. ;

Battaner, E. ;

Beelen, A. ;

Benabed, K. ;

Benoit, A. ;

Benoit-Levy, A. ;

Bernard, J. -P. ;

Bersanelli, M. ;

Bielewicz, P. ;

Bobin, J. ;

Bock, J. J. ;

Bonaldi, A. ;

Bonavera, L. ;

Bond, J. R. ;

Borrill, J. ;

Bouchet, F. R. ;

Bridges, M. ;

Bucher, M. ;

Burigana, C. ;

Butler, R. C. ;

Cardoso, J. -F. ;

Carvalho, P. ;

Catalano, A. ;

Challinor, A. ;

Chamballu, A. ;

Chen, X. ;

Chiang, H. C. ;

Chiang, L. -Y ;

Christensen, P. R. ;

Church, S. ;

Clemens, M. ;

Clements, D. L. ;

Colombi, S. ;

Colombo, L. P. L. ;

Couchot, F. ;

Coulais, A. ;

Crill, B. P. ;

Curto, A. ;

Cuttaia, F. .

ASTRONOMY & ASTROPHYSICS, 2014, 571

[8]

Ajello M., ARXIV151102938 FERM

[9]

[Anonymous], ARXIV13076862

[10] Gamma-rays from millisecond pulsar population within the central stellar cluster in the Galactic Centre [J].

Bednarek, W. ;

Sobczak, T. .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2013, 435 (01) :L14-L18

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