The Fermi Galactic Center GeV Excess and Implications for Dark Matter

M. Ackermann; M. Ajello; A. Albert; W. B. Atwood; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; R. Bellazzini; E. Bissaldi; R. D. Blandford; E. D. Bloom; R. Bonino; E. Bottacini; T. J. Brandt; J. Bregeon; P. Bruel; R. Buehler; T. H. Burnett; R. A. Cameron; R. Caputo; M. Caragiulo; P. A. Caraveo; E. Cavazzuti; C. Cecchi; E. Charles; A. Chekhtman; J. Chiang; A. Chiappo; G. Chiaro; S. Ciprini; J. Conrad; F. Costanza; A. Cuoco; S. Cutini; F. D'Ammando; F. De Palma; R. Desiante; S. W. Digel; N. Di Lalla; M. Di Mauro; L. Di Venere; P. S. Drell; C. Favuzzi; S. J. Fegan; E. C. Ferrara; W. B. Focke; A. Franckowiak; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; F. Giordano; M. Giroletti; T. Glanzman; G. A. Gomez-Vargas; D. Green; I. A. Grenier; J. E. Grove; L. Guillemot; S. Guiriec; M. Gustafsson; A. K. Harding; E. Hays; J. W. Hewitt; D. Horan; T. Jogler; A. S. Johnson; T. Kamae; D. Kocevski; M. Kuss; G. La Mura; S. Larsson; L. Latronico; J. Li; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; J. D. Magill; S. Maldera; D. Malyshev; A. Manfreda; P. Martin; M. N. Mazziotta; P. F. Michelson; N. Mirabal; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; M. E. Monzani; A. Morselli; M. Negro; E. Nuss; T. Ohsugi; M. Orienti; E. Orlando; J. F. Ormes; D. Paneque; J. S. Perkins; M. Persic; M. Pesce-Rollins; F. Piron; G. Principe; S. Rainò; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; M. Sánchez-Conde; C. Sgrò; D. Simone; E. J. Siskind; F. Spada; G. Spandre; P. Spinelli; D. J. Suson; H. Tajima; K. Tanaka; J. B. Thayer; L. Tibaldo; D. F. Torres; E. Troja; Y. Uchiyama; G. Vianello; K. S. Wood; M. Wood; G. Zaharijas; S. Zimmer

doi:10.3847/1538-4357/aa6cab

The Fermi Galactic Center GeV Excess and Implications for Dark Matter

M. Ackermann, M. Ajello, A. Albert, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, R. Bellazzini, E. Bissaldi, R. D. Blandford, E. D. Bloom, R. Bonino, E. Bottacini, T. J. Brandt, J. Bregeon, P. Bruel, R. Buehler, T. H. Burnett, R. A. CameronR. Caputo, M. Caragiulo, P. A. Caraveo, E. Cavazzuti, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, A. Chiappo, G. Chiaro, S. Ciprini, J. Conrad, F. Costanza, A. Cuoco, S. Cutini, F. D'Ammando, F. De Palma, R. Desiante, S. W. Digel, N. Di Lalla, M. Di Mauro, L. Di Venere, P. S. Drell, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, A. Franckowiak, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. A. Gomez-Vargas, D. Green, I. A. Grenier, J. E. Grove, L. Guillemot, S. Guiriec, M. Gustafsson, A. K. Harding, E. Hays, J. W. Hewitt, D. Horan, T. Jogler, A. S. Johnson, T. Kamae, D. Kocevski, M. Kuss, G. La Mura, S. Larsson, L. Latronico, J. Li, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, J. D. Magill, S. Maldera, D. Malyshev, A. Manfreda, P. Martin, M. N. Mazziotta, P. F. Michelson, N. Mirabal, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, M. E. Monzani, A. Morselli, M. Negro, E. Nuss, T. Ohsugi, M. Orienti, E. Orlando, J. F. Ormes, D. Paneque, J. S. Perkins, M. Persic, M. Pesce-Rollins, F. Piron, G. Principe, S. Rainò, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, M. Sánchez-Conde, C. Sgrò, D. Simone, E. J. Siskind, F. Spada, G. Spandre, P. Spinelli, D. J. Suson, H. Tajima, K. Tanaka, J. B. Thayer, L. Tibaldo, D. F. Torres, E. Troja, Y. Uchiyama, G. Vianello, K. S. Wood, M. Wood, G. Zaharijas, S. Zimmer

Physics

Research output: Contribution to journal › Article › peer-review

306 Citations (Scopus)

Abstract

The region around the Galactic Center (GC) is now well established to be brighter at energies of a few GeV than what is expected from conventional models of diffuse gamma-ray emission and catalogs of known gamma-ray sources. We study the GeV excess using 6.5 yr of data from the Fermi Large Area Telescope. We characterize the uncertainty of the GC excess spectrum and morphology due to uncertainties in cosmic-ray source distributions and propagation, uncertainties in the distribution of interstellar gas in the Milky Way, and uncertainties due to a potential contribution from the Fermi bubbles. We also evaluate uncertainties in the excess properties due to resolved point sources of gamma rays. The GC is of particular interest, as it would be expected to have the brightest signal from annihilation of weakly interacting massive dark matter (DM) particles. However, control regions along the Galactic plane, where a DM signal is not expected, show excesses of similar amplitude relative to the local background. Based on the magnitude of the systematic uncertainties, we conservatively report upper limits for the annihilation cross-section as a function of particle mass and annihilation channel.

Original language	English
Article number	43
Journal	Astrophysical Journal
Volume	840
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aa6cab
Publication status	Published - 1 May 2017

Keywords

Galaxy: bulge
Galaxy: center
Galaxy: halo
ISM: general
cosmic rays
gamma rays: general

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-4357/aa6cab

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Ackermann, M., Ajello, M., Albert, A., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bregeon, J., Bruel, P., Buehler, R., Burnett, T. H., ... Zimmer, S. (2017). The Fermi Galactic Center GeV Excess and Implications for Dark Matter. Astrophysical Journal, 840(1), Article 43. https://doi.org/10.3847/1538-4357/aa6cab

@article{10aa190222504d1295e3a046cf48ca2a,

title = "The Fermi Galactic Center GeV Excess and Implications for Dark Matter",

abstract = "The region around the Galactic Center (GC) is now well established to be brighter at energies of a few GeV than what is expected from conventional models of diffuse gamma-ray emission and catalogs of known gamma-ray sources. We study the GeV excess using 6.5 yr of data from the Fermi Large Area Telescope. We characterize the uncertainty of the GC excess spectrum and morphology due to uncertainties in cosmic-ray source distributions and propagation, uncertainties in the distribution of interstellar gas in the Milky Way, and uncertainties due to a potential contribution from the Fermi bubbles. We also evaluate uncertainties in the excess properties due to resolved point sources of gamma rays. The GC is of particular interest, as it would be expected to have the brightest signal from annihilation of weakly interacting massive dark matter (DM) particles. However, control regions along the Galactic plane, where a DM signal is not expected, show excesses of similar amplitude relative to the local background. Based on the magnitude of the systematic uncertainties, we conservatively report upper limits for the annihilation cross-section as a function of particle mass and annihilation channel.",

keywords = "Galaxy: bulge, Galaxy: center, Galaxy: halo, ISM: general, cosmic rays, gamma rays: general",

author = "M. Ackermann and M. Ajello and A. Albert and Atwood, {W. B.} and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and R. Bellazzini and E. Bissaldi and Blandford, {R. D.} and Bloom, {E. D.} and R. Bonino and E. Bottacini and Brandt, {T. J.} and J. Bregeon and P. Bruel and R. Buehler and Burnett, {T. H.} and Cameron, {R. A.} and R. Caputo and M. Caragiulo and Caraveo, {P. A.} and E. Cavazzuti and C. Cecchi and E. Charles and A. Chekhtman and J. Chiang and A. Chiappo and G. Chiaro and S. Ciprini and J. Conrad and F. Costanza and A. Cuoco and S. Cutini and F. D'Ammando and {De Palma}, F. and R. Desiante and Digel, {S. W.} and {Di Lalla}, N. and {Di Mauro}, M. and {Di Venere}, L. and Drell, {P. S.} and C. Favuzzi and Fegan, {S. J.} and Ferrara, {E. C.} and Focke, {W. B.} and A. Franckowiak and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and D. Gasparrini and N. Giglietto and F. Giordano and M. Giroletti and T. Glanzman and Gomez-Vargas, {G. A.} and D. Green and Grenier, {I. A.} and Grove, {J. E.} and L. Guillemot and S. Guiriec and M. Gustafsson and Harding, {A. K.} and E. Hays and Hewitt, {J. W.} and D. Horan and T. Jogler and Johnson, {A. S.} and T. Kamae and D. Kocevski and M. Kuss and {La Mura}, G. and S. Larsson and L. Latronico and J. Li and F. Longo and F. Loparco and Lovellette, {M. N.} and P. Lubrano and Magill, {J. D.} and S. Maldera and D. Malyshev and A. Manfreda and P. Martin and Mazziotta, {M. N.} and Michelson, {P. F.} and N. Mirabal and W. Mitthumsiri and T. Mizuno and Moiseev, {A. A.} and Monzani, {M. E.} and A. Morselli and M. Negro and E. Nuss and T. Ohsugi and M. Orienti and E. Orlando and Ormes, {J. F.} and D. Paneque and Perkins, {J. S.} and M. Persic and M. Pesce-Rollins and F. Piron and G. Principe and S. Rain{\`o} and R. Rando and M. Razzano and S. Razzaque and A. Reimer and O. Reimer and M. S{\'a}nchez-Conde and C. Sgr{\`o} and D. Simone and Siskind, {E. J.} and F. Spada and G. Spandre and P. Spinelli and Suson, {D. J.} and H. Tajima and K. Tanaka and Thayer, {J. B.} and L. Tibaldo and Torres, {D. F.} and E. Troja and Y. Uchiyama and G. Vianello and Wood, {K. S.} and M. Wood and G. Zaharijas and S. Zimmer",

year = "2017",

month = may,

day = "1",

doi = "10.3847/1538-4357/aa6cab",

language = "English",

volume = "840",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Ackermann, M, Ajello, M, Albert, A, Atwood, WB, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Bellazzini, R, Bissaldi, E, Blandford, RD, Bloom, ED, Bonino, R, Bottacini, E, Brandt, TJ, Bregeon, J, Bruel, P, Buehler, R, Burnett, TH, Cameron, RA, Caputo, R, Caragiulo, M, Caraveo, PA, Cavazzuti, E, Cecchi, C, Charles, E, Chekhtman, A, Chiang, J, Chiappo, A, Chiaro, G, Ciprini, S, Conrad, J, Costanza, F, Cuoco, A, Cutini, S, D'Ammando, F, De Palma, F, Desiante, R, Digel, SW, Di Lalla, N, Di Mauro, M, Di Venere, L, Drell, PS, Favuzzi, C, Fegan, SJ, Ferrara, EC, Focke, WB, Franckowiak, A, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Giglietto, N, Giordano, F, Giroletti, M, Glanzman, T, Gomez-Vargas, GA, Green, D, Grenier, IA, Grove, JE, Guillemot, L, Guiriec, S, Gustafsson, M, Harding, AK, Hays, E, Hewitt, JW, Horan, D, Jogler, T, Johnson, AS, Kamae, T, Kocevski, D, Kuss, M, La Mura, G, Larsson, S, Latronico, L, Li, J, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Magill, JD, Maldera, S, Malyshev, D, Manfreda, A, Martin, P, Mazziotta, MN, Michelson, PF, Mirabal, N, Mitthumsiri, W, Mizuno, T, Moiseev, AA, Monzani, ME, Morselli, A, Negro, M, Nuss, E, Ohsugi, T, Orienti, M, Orlando, E, Ormes, JF, Paneque, D, Perkins, JS, Persic, M, Pesce-Rollins, M, Piron, F, Principe, G, Rainò, S, Rando, R, Razzano, M, Razzaque, S, Reimer, A, Reimer, O, Sánchez-Conde, M, Sgrò, C, Simone, D, Siskind, EJ, Spada, F, Spandre, G, Spinelli, P, Suson, DJ, Tajima, H, Tanaka, K, Thayer, JB, Tibaldo, L, Torres, DF, Troja, E, Uchiyama, Y, Vianello, G, Wood, KS, Wood, M, Zaharijas, G & Zimmer, S 2017, 'The Fermi Galactic Center GeV Excess and Implications for Dark Matter', Astrophysical Journal, vol. 840, no. 1, 43. https://doi.org/10.3847/1538-4357/aa6cab

TY - JOUR

T1 - The Fermi Galactic Center GeV Excess and Implications for Dark Matter

AU - Ackermann, M.

AU - Ajello, M.

AU - Albert, A.

AU - Atwood, W. B.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - Bellazzini, R.

AU - Bissaldi, E.

AU - Blandford, R. D.

AU - Bloom, E. D.

AU - Bonino, R.

AU - Bottacini, E.

AU - Brandt, T. J.

AU - Bregeon, J.

AU - Bruel, P.

AU - Buehler, R.

AU - Burnett, T. H.

AU - Cameron, R. A.

AU - Caputo, R.

AU - Caragiulo, M.

AU - Caraveo, P. A.

AU - Cavazzuti, E.

AU - Cecchi, C.

AU - Charles, E.

AU - Chekhtman, A.

AU - Chiang, J.

AU - Chiappo, A.

AU - Chiaro, G.

AU - Ciprini, S.

AU - Conrad, J.

AU - Costanza, F.

AU - Cuoco, A.

AU - Cutini, S.

AU - D'Ammando, F.

AU - De Palma, F.

AU - Desiante, R.

AU - Digel, S. W.

AU - Di Lalla, N.

AU - Di Mauro, M.

AU - Di Venere, L.

AU - Drell, P. S.

AU - Favuzzi, C.

AU - Fegan, S. J.

AU - Ferrara, E. C.

AU - Focke, W. B.

AU - Franckowiak, A.

AU - Fukazawa, Y.

AU - Funk, S.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Giglietto, N.

AU - Giordano, F.

AU - Giroletti, M.

AU - Glanzman, T.

AU - Gomez-Vargas, G. A.

AU - Green, D.

AU - Grenier, I. A.

AU - Grove, J. E.

AU - Guillemot, L.

AU - Guiriec, S.

AU - Gustafsson, M.

AU - Harding, A. K.

AU - Hays, E.

AU - Hewitt, J. W.

AU - Horan, D.

AU - Jogler, T.

AU - Johnson, A. S.

AU - Kamae, T.

AU - Kocevski, D.

AU - Kuss, M.

AU - La Mura, G.

AU - Larsson, S.

AU - Latronico, L.

AU - Li, J.

AU - Longo, F.

AU - Loparco, F.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Magill, J. D.

AU - Maldera, S.

AU - Malyshev, D.

AU - Manfreda, A.

AU - Martin, P.

AU - Mazziotta, M. N.

AU - Michelson, P. F.

AU - Mirabal, N.

AU - Mitthumsiri, W.

AU - Mizuno, T.

AU - Moiseev, A. A.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Negro, M.

AU - Nuss, E.

AU - Ohsugi, T.

AU - Orienti, M.

AU - Orlando, E.

AU - Ormes, J. F.

AU - Paneque, D.

AU - Perkins, J. S.

AU - Persic, M.

AU - Pesce-Rollins, M.

AU - Piron, F.

AU - Principe, G.

AU - Rainò, S.

AU - Rando, R.

AU - Razzano, M.

AU - Razzaque, S.

AU - Reimer, A.

AU - Reimer, O.

AU - Sánchez-Conde, M.

AU - Sgrò, C.

AU - Simone, D.

AU - Siskind, E. J.

AU - Spada, F.

AU - Spandre, G.

AU - Spinelli, P.

AU - Suson, D. J.

AU - Tajima, H.

AU - Tanaka, K.

AU - Thayer, J. B.

AU - Tibaldo, L.

AU - Torres, D. F.

AU - Troja, E.

AU - Uchiyama, Y.

AU - Vianello, G.

AU - Wood, K. S.

AU - Wood, M.

AU - Zaharijas, G.

AU - Zimmer, S.

PY - 2017/5/1

Y1 - 2017/5/1

N2 - The region around the Galactic Center (GC) is now well established to be brighter at energies of a few GeV than what is expected from conventional models of diffuse gamma-ray emission and catalogs of known gamma-ray sources. We study the GeV excess using 6.5 yr of data from the Fermi Large Area Telescope. We characterize the uncertainty of the GC excess spectrum and morphology due to uncertainties in cosmic-ray source distributions and propagation, uncertainties in the distribution of interstellar gas in the Milky Way, and uncertainties due to a potential contribution from the Fermi bubbles. We also evaluate uncertainties in the excess properties due to resolved point sources of gamma rays. The GC is of particular interest, as it would be expected to have the brightest signal from annihilation of weakly interacting massive dark matter (DM) particles. However, control regions along the Galactic plane, where a DM signal is not expected, show excesses of similar amplitude relative to the local background. Based on the magnitude of the systematic uncertainties, we conservatively report upper limits for the annihilation cross-section as a function of particle mass and annihilation channel.

AB - The region around the Galactic Center (GC) is now well established to be brighter at energies of a few GeV than what is expected from conventional models of diffuse gamma-ray emission and catalogs of known gamma-ray sources. We study the GeV excess using 6.5 yr of data from the Fermi Large Area Telescope. We characterize the uncertainty of the GC excess spectrum and morphology due to uncertainties in cosmic-ray source distributions and propagation, uncertainties in the distribution of interstellar gas in the Milky Way, and uncertainties due to a potential contribution from the Fermi bubbles. We also evaluate uncertainties in the excess properties due to resolved point sources of gamma rays. The GC is of particular interest, as it would be expected to have the brightest signal from annihilation of weakly interacting massive dark matter (DM) particles. However, control regions along the Galactic plane, where a DM signal is not expected, show excesses of similar amplitude relative to the local background. Based on the magnitude of the systematic uncertainties, we conservatively report upper limits for the annihilation cross-section as a function of particle mass and annihilation channel.

KW - Galaxy: bulge

KW - Galaxy: center

KW - Galaxy: halo

KW - ISM: general

KW - cosmic rays

KW - gamma rays: general

UR - http://www.scopus.com/inward/record.url?scp=85019104376&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aa6cab

DO - 10.3847/1538-4357/aa6cab

M3 - Article

AN - SCOPUS:85019104376

SN - 0004-637X

VL - 840

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 43

ER -

The Fermi Galactic Center GeV Excess and Implications for Dark Matter

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Keywords

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