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

Research output: Contribution to journalArticle

174 Citations (Scopus)

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.

Original languageEnglish (US)
Article number110
JournalAstrophysical Journal
Volume834
Issue number2
DOIs
StatePublished - Jan 10 2017
Externally publishedYes

Fingerprint

dwarf galaxies
stellar systems
rays
telescopes
dark matter
blanks
sky
kinematics
cross section
galaxies
scaling
analysis
sensitivity
cross sections

Keywords

  • dark matter
  • galaxies: dwarf
  • gamma rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Albert, A., Anderson, B., Bechtol, K., Drlica-Wagner, A., Meyer, M., Sánchez-Conde, M., ... Wechsler, R. H. (2017). SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT. Astrophysical Journal, 834(2), [110]. https://doi.org/10.3847/1538-4357/834/2/110

SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT. / 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. Carnero; Kind, M. Carrasco; Carretero, J.; Crocce, M.; Cunha, C. E.; D'Andrea, C. B.; Da Costa, L. N.; Desai, S.; Diehl, H. T.; Dietrich, J. P.; Doel, P.; Eifler, T. F.; Evrard, A. E.; Neto, A. Fausti; Finley, D. A.; Flaugher, B.; Fosalba, P.; Frieman, J.; Gerdes, D. W.; Goldstein, D. A.; Gruen, D.; Gruendl, R. A.; Honscheid, K.; James, D. J.; Kent, S.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Li, T. S.; Maia, M. A.G.; March, M.; Marshall, J. L.; Martini, P.; Miller, C. J.; Miquel, R.; Neilsen, E.; Nord, B.; Ogando, R.; Plazas, A. A.; Reil, K.; Romer, A. K.; Rykoff, E. S.; Sanchez, E.; Santiago, B.; Schubnell, M.; Sevilla-Noarbe, I.; Smith, R. C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Swanson, M. E.C.; Tarle, G.; Vikram, V.; Walker, A. R.; Wechsler, R. H.

In: Astrophysical Journal, Vol. 834, No. 2, 110, 10.01.2017.

Research output: Contribution to journalArticle

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
Albert A, Anderson B, Bechtol K, Drlica-Wagner A, Meyer M, Sánchez-Conde M et al. SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT. Astrophysical Journal. 2017 Jan 10;834(2). 110. https://doi.org/10.3847/1538-4357/834/2/110
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. Carnero ; Kind, M. Carrasco ; Carretero, J. ; Crocce, M. ; Cunha, C. E. ; D'Andrea, C. B. ; Da Costa, L. N. ; Desai, S. ; Diehl, H. T. ; Dietrich, J. P. ; Doel, P. ; Eifler, T. F. ; Evrard, A. E. ; Neto, A. Fausti ; Finley, D. A. ; Flaugher, B. ; Fosalba, P. ; Frieman, J. ; Gerdes, D. W. ; Goldstein, D. A. ; Gruen, D. ; Gruendl, R. A. ; Honscheid, K. ; James, D. J. ; Kent, S. ; Kuehn, K. ; Kuropatkin, N. ; Lahav, O. ; Li, T. S. ; Maia, M. A.G. ; March, M. ; Marshall, J. L. ; Martini, P. ; Miller, C. J. ; Miquel, R. ; Neilsen, E. ; Nord, B. ; Ogando, R. ; Plazas, A. A. ; Reil, K. ; Romer, A. K. ; Rykoff, E. S. ; Sanchez, E. ; Santiago, B. ; Schubnell, M. ; Sevilla-Noarbe, I. ; Smith, R. C. ; Soares-Santos, M. ; Sobreira, F. ; Suchyta, E. ; Swanson, M. E.C. ; Tarle, G. ; Vikram, V. ; Walker, A. R. ; Wechsler, R. H. / SEARCHING for DARK MATTER ANNIHILATION in RECENTLY DISCOVERED MILKY WAY SATELLITES with FERMI-LAT. In: Astrophysical Journal. 2017 ; Vol. 834, No. 2.
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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 (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.",
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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

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