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Title: Searching for Dark Matter annihilation in recently discovered Milky Way satellites with FERMI-LAT

Abstract

Here, 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 $$\sim $$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 $$\lt 1\sigma $$). 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 ($${m}_{\mathrm{DM},b\bar{b}}\gtrsim 1\,\mathrm{TeV}$$ and $${m}_{\mathrm{DM},{\tau }^{+}{\tau }^{-}}\gtrsim 70\,\mathrm{GeV}$$) and weakening by a factor of ~1.5 at lower masses relative to previously observed limits.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
The Fermi-LAT and DES Collaborations
OSTI Identifier:
1353474
Alternate Identifier(s):
OSTI ID: 1355744; OSTI ID: 1565890
Report Number(s):
FERMILAB-PUB-16-073-AE; arXiv:1611.03184; LA-UR-18-29815
Journal ID: ISSN 1538-4357; 1496953
Grant/Contract Number:  
AC02-07CH11359; AC02-76SF00515; 89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 834; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; dwarf gamma rays galaxies; dark matter galaxies; dark matter; galaxies: dwarf; gamma rays: galaxies; Atomic, Nuclear and Particle Physics; Astronomy and Astrophysics

Citation Formats

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., and Wechsler, R. H. Searching for Dark Matter annihilation in recently discovered Milky Way satellites with FERMI-LAT. United States: N. p., 2017. Web. doi: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. United States. doi: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., and Wechsler, R. H. Fri . "Searching for Dark Matter annihilation in recently discovered Milky Way satellites with FERMI-LAT". United States. doi:10.3847/1538-4357/834/2/110. https://www.osti.gov/servlets/purl/1353474.
@article{osti_1353474,
title = {Searching for Dark Matter annihilation in recently discovered Milky Way satellites with FERMI-LAT},
author = {Albert, A. and Anderson, B. and Bechtol, K. and Drlica-Wagner, A. and Meyer, M. and Sánchez-Conde, M. and Strigari, L. and Wood, M. and Abbott, T. M. C. and Abdalla, F. B. and Benoit-Lévy, A. and Bernstein, G. M. and Bernstein, R. A. and Bertin, E. and Brooks, D. and Burke, D. L. and Rosell, A. Carnero and Kind, M. Carrasco and Carretero, J. and Crocce, M. and Cunha, C. E. and D’Andrea, C. B. and da Costa, L. N. and Desai, S. and Diehl, H. T. and Dietrich, J. P. and Doel, P. and Eifler, T. F. and Evrard, A. E. and Neto, A. Fausti and Finley, D. A. and Flaugher, B. and Fosalba, P. and Frieman, J. and Gerdes, D. W. and Goldstein, D. A. and Gruen, D. and Gruendl, R. A. and Honscheid, K. and James, D. J. and Kent, S. and Kuehn, K. and Kuropatkin, N. and Lahav, O. and Li, T. S. and Maia, M. A. G. and March, M. and Marshall, J. L. and Martini, P. and Miller, C. J. and Miquel, R. and Neilsen, E. and Nord, B. and Ogando, R. and Plazas, A. A. and Reil, K. and Romer, A. K. and Rykoff, E. S. and Sanchez, E. and Santiago, B. and Schubnell, M. and Sevilla-Noarbe, I. and Smith, R. C. and Soares-Santos, M. and Sobreira, F. and Suchyta, E. and Swanson, M. E. C. and Tarle, G. and Vikram, V. and Walker, A. R. and Wechsler, R. H.},
abstractNote = {Here, 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 $\sim $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 $\lt 1\sigma $). Our analysis has increased sensitivity compared to the analysis of 15 confirmed dSphs by Ackermann et al. The observed constraints on the DM annihilation cross section are statistically consistent with the background expectation, improving by a factor of ~2 for large DM masses (${m}_{\mathrm{DM},b\bar{b}}\gtrsim 1\,\mathrm{TeV}$ and ${m}_{\mathrm{DM},{\tau }^{+}{\tau }^{-}}\gtrsim 70\,\mathrm{GeV}$) and weakening by a factor of ~1.5 at lower masses relative to previously observed limits.},
doi = {10.3847/1538-4357/834/2/110},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 834,
place = {United States},
year = {2017},
month = {1}
}

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Figures / Tables:

Figure 1 Figure 1: Absolute visual magnitude ($M$$V$ ) versus physical half-light radius ($r$1/2) for dSphs and globular clusters. Globular clusters, which do not contain measurable DM within their visible stellar distribution, are marked with red crosses (Fadely et al. 2011; Harris 1996, 2010 edition). Spectroscopically confirmed DM-dominated dSphs are labeled withmore » filled green squares. Segue 2 (open green square) has the chemical signatures of a dSph, but exhibits a low velocity dispersion (Kirby et al. 2013), and is therefore excluded from our target list. Milky Way satellites lacking spectroscopic observations are labeled with black filled circles. Thick orange lines indicate our target sample selection cuts on objects lacking spectroscopic data (see Section 5): nominal (solid; $r$1/2 > 20 pc) and inclusive (dashed; $r$1/2 > 10 pc). Black dashed lines indicate contours of constant surface brightness ($μ$).« less

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    Scaling relations for dark matter annihilation and decay profiles in dwarf spheroidal galaxies
    journal, October 2018

    • Pace, Andrew B.; Strigari, Louis E.
    • Monthly Notices of the Royal Astronomical Society, Vol. 482, Issue 3
    • DOI: 10.1093/mnras/sty2839

    On the dissection of degenerate cosmologies with machine learning
    journal, April 2019

    • Merten, Julian; Giocoli, Carlo; Baldi, Marco
    • Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 1
    • DOI: 10.1093/mnras/stz972

    Current status and future prospects of the singlet-doublet dark matter model with C P violation
    journal, February 2019


    Search for γ -ray emission from dark matter particle interactions from the Andromeda and Triangulum galaxies with the Fermi Large Area Telescope
    journal, June 2019


    Velocity Dependence from Resonant Self-Interacting Dark Matter
    journal, February 2019


    Scalar dark matter probes the scale of nonlocality
    journal, August 2019