SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT

A. Albert; B. Anderson; K. Bechtol; A. Drlica-Wagner; M. Meyer; M. Sánchez-Conde; L. Strigari; M. Wood; T. M.C. Abbott; F. B. Abdalla; A. Benoit-Lévy; G. M. Bernstein; R. A. Bernstein; E. Bertin; D. Brooks; D. L. Burke; A. Carnero Rosell; M. Carrasco Kind; J. Carretero; M. Crocce; C. E. Cunha; C. B. D'Andrea; L. N. Da Costa; S. Desai; H. T. Diehl; J. P. Dietrich; P. Doel; T. F. Eifler; A. E. Evrard; A. Fausti Neto; D. A. Finley; B. Flaugher; P. Fosalba; J. Frieman; D. W. Gerdes; D. A. Goldstein; D. Gruen; R. A. Gruendl; K. Honscheid; D. J. James; S. Kent; K. Kuehn; N. Kuropatkin; O. Lahav; T. S. Li; M. A.G. Maia; M. March; J. L. Marshall; P. Martini; C. J. Miller; R. Miquel; E. Neilsen; B. Nord; R. Ogando; A. A. Plazas; K. Reil; A. K. Romer; E. S. Rykoff; E. Sanchez; B. Santiago; M. Schubnell; I. Sevilla-Noarbe; R. C. Smith; M. Soares-Santos; F. Sobreira; E. Suchyta; M. E.C. Swanson; G. Tarle; V. Vikram; A. R. Walker; R. H. Wechsler

doi:10.3847/1538-4357/834/2/110

SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT

A. Albert, B. Anderson, K. Bechtol, A. Drlica-Wagner, M. Meyer, M. Sánchez-Conde, L. Strigari, M. Wood, T. M.C. Abbott, F. B. Abdalla, A. Benoit-Lévy, G. M. Bernstein, R. A. Bernstein, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, M. CrocceC. E. Cunha, C. B. D'Andrea, L. N. Da Costa, S. Desai, H. T. Diehl, J. P. Dietrich, P. Doel, T. F. Eifler, A. E. Evrard, A. Fausti Neto, D. A. Finley, B. Flaugher, P. Fosalba, J. Frieman, D. W. Gerdes, D. A. Goldstein, D. Gruen, R. A. Gruendl, K. Honscheid, D. J. James, S. Kent, K. Kuehn, N. Kuropatkin, O. Lahav, T. S. Li, M. A.G. Maia, M. March, J. L. Marshall, P. Martini, C. J. Miller, R. Miquel, E. Neilsen, B. Nord, R. Ogando, A. A. Plazas, K. Reil, A. K. Romer, E. S. Rykoff, E. Sanchez, B. Santiago, M. Schubnell, I. Sevilla-Noarbe, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. E.C. Swanson, G. Tarle, V. Vikram, A. R. Walker, R. H. Wechsler

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Abstract

We search for excess γ-ray emission coincident with the positions of confirmed and candidate Milky Way satellite galaxies using six years of data from the Fermi Large Area Telescope (LAT). Our sample of 45 stellar systems includes 28 kinematically confirmed dark-matter-dominated dwarf spheroidal galaxies (dSphs) and 17 recently discovered systems that have photometric characteristics consistent with the population of known dSphs. For each of these targets, the relative predicted γ-ray flux due to dark matter annihilation is taken from kinematic analysis if available, and estimated from a distance-based scaling relation otherwise, assuming that the stellar systems are DM-dominated dSphs. LAT data coincident with four of the newly discovered targets show a slight preference (each ∼2σ local) for γ-ray emission in excess of the background. However, the ensemble of derived γ-ray flux upper limits for individual targets is consistent with the expectation from analyzing random blank-sky regions, and a combined analysis of the population of stellar systems yields no globally significant excess (global significance < 1σ). Our analysis has increased sensitivity compared to the analysis of 15 confirmed dSphs by Ackermann et al. The observed constraints on the DM annihilation cross section are statistically consistent with the background expectation, improving by a factor of ∼2 for large DM masses (m_DM,bb ≳ 1 TeV and m_DM,τ+τ- ≳70 GeV) and weakening by a factor of ∼1.5 at lower masses relative to previously observed limits.

Original language	English
Article number	110
Journal	Astrophysical Journal
Volume	834
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/834/2/110
State	Published - Jan 10 2017

Funding

The DES Projects has been provided by the U.S. Department of Energy, the U.S. National Science Foundation, the Ministry of Science and Education of Spain, the Science and Technology Facilities Council of the United Kingdom, the Higher Education Funding Council for England, the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign, the Kavli Institute of Cosmological Physics at the University of Chicago, the Center for Cosmology and Astro-Particle Physics at the Ohio State University, the Mitchell Institute for Fundamental Physics and Astronomy at Texas A and M University, Financiadora de Estudos e Projetos, Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Cientifico e Tecnologico and the Ministerio da Ciencia, Tecnologia e Inovacao, the Deutsche Forschungsgemeinschaft and the Collaborating Institutions in the DES. The DES data management system is supported by the National Science Foundation under Grant Number AST-1138766. The DES participants from Spanish institutions are partially supported by MINECO under grants AYA2012-39559, ESP2013-48274, FPA2013-47986, and Centro de Excelencia Severo Ochoa SEV-2012-0234, some of which include ERDF funds from the European Union.

Keywords

dark matter
galaxies: dwarf
gamma rays: galaxies

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10.3847/1538-4357/834/2/110

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Albert, A., Anderson, B., Bechtol, K., Drlica-Wagner, A., Meyer, M., Sánchez-Conde, M., Strigari, L., Wood, M., Abbott, T. M. C., Abdalla, F. B., Benoit-Lévy, A., Bernstein, G. M., Bernstein, R. A., Bertin, E., Brooks, D., Burke, D. L., Rosell, A. C., Kind, M. C., Carretero, J., ... Wechsler, R. H. (2017). SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT. Astrophysical Journal, 834(2), Article 110. https://doi.org/10.3847/1538-4357/834/2/110

@article{cf1b9cbdaab54235bcb23367e7eca9a2,

title = "SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT",

abstract = "We search for excess γ-ray emission coincident with the positions of confirmed and candidate Milky Way satellite galaxies using six years of data from the Fermi Large Area Telescope (LAT). Our sample of 45 stellar systems includes 28 kinematically confirmed dark-matter-dominated dwarf spheroidal galaxies (dSphs) and 17 recently discovered systems that have photometric characteristics consistent with the population of known dSphs. For each of these targets, the relative predicted γ-ray flux due to dark matter annihilation is taken from kinematic analysis if available, and estimated from a distance-based scaling relation otherwise, assuming that the stellar systems are DM-dominated dSphs. LAT data coincident with four of the newly discovered targets show a slight preference (each ∼2σ local) for γ-ray emission in excess of the background. However, the ensemble of derived γ-ray flux upper limits for individual targets is consistent with the expectation from analyzing random blank-sky regions, and a combined analysis of the population of stellar systems yields no globally significant excess (global significance < 1σ). Our analysis has increased sensitivity compared to the analysis of 15 confirmed dSphs by Ackermann et al. The observed constraints on the DM annihilation cross section are statistically consistent with the background expectation, improving by a factor of ∼2 for large DM masses (mDM,bb ≳ 1 TeV and mDM,τ+τ- ≳70 GeV) and weakening by a factor of ∼1.5 at lower masses relative to previously observed limits.",

keywords = "dark matter, galaxies: dwarf, gamma rays: galaxies",

author = "A. Albert and B. Anderson and K. Bechtol and A. Drlica-Wagner and M. Meyer and M. S{\'a}nchez-Conde and L. Strigari and M. Wood and Abbott, {T. M.C.} and Abdalla, {F. B.} and A. Benoit-L{\'e}vy and Bernstein, {G. M.} and Bernstein, {R. A.} and E. Bertin and D. Brooks and Burke, {D. L.} and Rosell, {A. Carnero} and Kind, {M. Carrasco} and J. Carretero and M. Crocce and Cunha, {C. E.} and D'Andrea, {C. B.} and {Da Costa}, {L. N.} and S. Desai and Diehl, {H. T.} and Dietrich, {J. P.} and P. Doel and Eifler, {T. F.} and Evrard, {A. E.} and Neto, {A. Fausti} and Finley, {D. A.} and B. Flaugher and P. Fosalba and J. Frieman and Gerdes, {D. W.} and Goldstein, {D. A.} and D. Gruen and Gruendl, {R. A.} and K. Honscheid and James, {D. J.} and S. Kent and K. Kuehn and N. Kuropatkin and O. Lahav and Li, {T. S.} and Maia, {M. A.G.} and M. March and Marshall, {J. L.} and P. Martini and Miller, {C. J.} and R. Miquel and E. Neilsen and B. Nord and R. Ogando and Plazas, {A. A.} and K. Reil and Romer, {A. K.} and Rykoff, {E. S.} and E. Sanchez and B. Santiago and M. Schubnell and I. Sevilla-Noarbe and Smith, {R. C.} and M. Soares-Santos and F. Sobreira and E. Suchyta and Swanson, {M. E.C.} and G. Tarle and V. Vikram and Walker, {A. R.} and Wechsler, {R. H.}",

year = "2017",

month = jan,

day = "10",

doi = "10.3847/1538-4357/834/2/110",

language = "English",

volume = "834",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

}

Albert, A, Anderson, B, Bechtol, K, Drlica-Wagner, A, Meyer, M, Sánchez-Conde, M, Strigari, L, Wood, M, Abbott, TMC, Abdalla, FB, Benoit-Lévy, A, Bernstein, GM, Bernstein, RA, Bertin, E, Brooks, D, Burke, DL, Rosell, AC, Kind, MC, Carretero, J, Crocce, M, Cunha, CE, D'Andrea, CB, Da Costa, LN, Desai, S, Diehl, HT, Dietrich, JP, Doel, P, Eifler, TF, Evrard, AE, Neto, AF, Finley, DA, Flaugher, B, Fosalba, P, Frieman, J, Gerdes, DW, Goldstein, DA, Gruen, D, Gruendl, RA, Honscheid, K, James, DJ, Kent, S, Kuehn, K, Kuropatkin, N, Lahav, O, Li, TS, Maia, MAG, March, M, Marshall, JL, Martini, P, Miller, CJ, Miquel, R, Neilsen, E, Nord, B, Ogando, R, Plazas, AA, Reil, K, Romer, AK, Rykoff, ES, Sanchez, E, Santiago, B, Schubnell, M, Sevilla-Noarbe, I, Smith, RC, Soares-Santos, M, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Vikram, V, Walker, AR & Wechsler, RH 2017, 'SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT', Astrophysical Journal, vol. 834, no. 2, 110. https://doi.org/10.3847/1538-4357/834/2/110

TY - JOUR

T1 - SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT

AU - Albert, A.

AU - Anderson, B.

AU - Bechtol, K.

AU - Drlica-Wagner, A.

AU - Meyer, M.

AU - Sánchez-Conde, M.

AU - Strigari, L.

AU - Wood, M.

AU - Abbott, T. M.C.

AU - Abdalla, F. B.

AU - Benoit-Lévy, A.

AU - Bernstein, G. M.

AU - Bernstein, R. A.

AU - Bertin, E.

AU - Brooks, D.

AU - Burke, D. L.

AU - Rosell, A. Carnero

AU - Kind, M. Carrasco

AU - Carretero, J.

AU - Crocce, M.

AU - Cunha, C. E.

AU - D'Andrea, C. B.

AU - Da Costa, L. N.

AU - Desai, S.

AU - Diehl, H. T.

AU - Dietrich, J. P.

AU - Doel, P.

AU - Eifler, T. F.

AU - Evrard, A. E.

AU - Neto, A. Fausti

AU - Finley, D. A.

AU - Flaugher, B.

AU - Fosalba, P.

AU - Frieman, J.

AU - Gerdes, D. W.

AU - Goldstein, D. A.

AU - Gruen, D.

AU - Gruendl, R. A.

AU - Honscheid, K.

AU - James, D. J.

AU - Kent, S.

AU - Kuehn, K.

AU - Kuropatkin, N.

AU - Lahav, O.

AU - Li, T. S.

AU - Maia, M. A.G.

AU - March, M.

AU - Marshall, J. L.

AU - Martini, P.

AU - Miller, C. J.

AU - Miquel, R.

AU - Neilsen, E.

AU - Nord, B.

AU - Ogando, R.

AU - Plazas, A. A.

AU - Reil, K.

AU - Romer, A. K.

AU - Rykoff, E. S.

AU - Sanchez, E.

AU - Santiago, B.

AU - Schubnell, M.

AU - Sevilla-Noarbe, I.

AU - Smith, R. C.

AU - Soares-Santos, M.

AU - Sobreira, F.

AU - Suchyta, E.

AU - Swanson, M. E.C.

AU - Tarle, G.

AU - Vikram, V.

AU - Walker, A. R.

AU - Wechsler, R. H.

PY - 2017/1/10

Y1 - 2017/1/10

N2 - We search for excess γ-ray emission coincident with the positions of confirmed and candidate Milky Way satellite galaxies using six years of data from the Fermi Large Area Telescope (LAT). Our sample of 45 stellar systems includes 28 kinematically confirmed dark-matter-dominated dwarf spheroidal galaxies (dSphs) and 17 recently discovered systems that have photometric characteristics consistent with the population of known dSphs. For each of these targets, the relative predicted γ-ray flux due to dark matter annihilation is taken from kinematic analysis if available, and estimated from a distance-based scaling relation otherwise, assuming that the stellar systems are DM-dominated dSphs. LAT data coincident with four of the newly discovered targets show a slight preference (each ∼2σ local) for γ-ray emission in excess of the background. However, the ensemble of derived γ-ray flux upper limits for individual targets is consistent with the expectation from analyzing random blank-sky regions, and a combined analysis of the population of stellar systems yields no globally significant excess (global significance < 1σ). Our analysis has increased sensitivity compared to the analysis of 15 confirmed dSphs by Ackermann et al. The observed constraints on the DM annihilation cross section are statistically consistent with the background expectation, improving by a factor of ∼2 for large DM masses (mDM,bb ≳ 1 TeV and mDM,τ+τ- ≳70 GeV) and weakening by a factor of ∼1.5 at lower masses relative to previously observed limits.

AB - We search for excess γ-ray emission coincident with the positions of confirmed and candidate Milky Way satellite galaxies using six years of data from the Fermi Large Area Telescope (LAT). Our sample of 45 stellar systems includes 28 kinematically confirmed dark-matter-dominated dwarf spheroidal galaxies (dSphs) and 17 recently discovered systems that have photometric characteristics consistent with the population of known dSphs. For each of these targets, the relative predicted γ-ray flux due to dark matter annihilation is taken from kinematic analysis if available, and estimated from a distance-based scaling relation otherwise, assuming that the stellar systems are DM-dominated dSphs. LAT data coincident with four of the newly discovered targets show a slight preference (each ∼2σ local) for γ-ray emission in excess of the background. However, the ensemble of derived γ-ray flux upper limits for individual targets is consistent with the expectation from analyzing random blank-sky regions, and a combined analysis of the population of stellar systems yields no globally significant excess (global significance < 1σ). Our analysis has increased sensitivity compared to the analysis of 15 confirmed dSphs by Ackermann et al. The observed constraints on the DM annihilation cross section are statistically consistent with the background expectation, improving by a factor of ∼2 for large DM masses (mDM,bb ≳ 1 TeV and mDM,τ+τ- ≳70 GeV) and weakening by a factor of ∼1.5 at lower masses relative to previously observed limits.

KW - dark matter

KW - galaxies: dwarf

KW - gamma rays: galaxies

UR - http://www.scopus.com/inward/record.url?scp=85010049803&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/834/2/110

DO - 10.3847/1538-4357/834/2/110

M3 - Article

AN - SCOPUS:85010049803

SN - 0004-637X

VL - 834

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 110

ER -

SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT

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