Abstract
We use 413 weeks of publicly available Fermi Pass 8 gamma-ray data combined with recently developed galaxy group catalogs to search for evidence of dark matter annihilation in extragalactic halos. In our study, we use luminosity-based mass estimates and mass-to-concentration relations to infer the J factors and associated uncertainties for hundreds of galaxy groups within a redshift range z≲0.03. We employ a conservative substructure boost factor model, which only enhances the sensitivity by an O(1) factor. No significant evidence for dark matter annihilation is found, and we exclude thermal relic cross sections for dark matter masses below ∼30 GeV to 95% confidence in the bb annihilation channel. These bounds are comparable to those from Milky Way dwarf spheroidal satellite galaxies. The results of our analysis increase the tension but do not rule out the dark matter interpretation of the Galactic Center excess. We provide a catalog of the galaxy groups used in this study and their inferred properties, which can be broadly applied to searches for extragalactic dark matter.
Original language | English (US) |
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Article number | 101101 |
Journal | Physical review letters |
Volume | 120 |
Issue number | 10 |
DOIs | |
State | Published - Mar 9 2018 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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In: Physical review letters, Vol. 120, No. 10, 101101, 09.03.2018.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Search for Dark Matter Annihilation in Galaxy Groups
AU - Lisanti, Mariangela
AU - Mishra-Sharma, Siddharth
AU - Rodd, Nicholas L.
AU - Safdi, Benjamin R.
N1 - Funding Information: This Letter presented the results of the first systematic search for annihilating DM in nearby galaxy groups. We introduced and validated a prescription to infer properties of DM halos associated with these groups, thereby allowing us to build a map of DM annihilation in the local Universe. Using this map, we performed a stacked analysis of several hundred galaxy groups and obtained bounds that exclude thermal cross sections for DM annihilating to b b ¯ with mass below ∼ 30 GeV , assuming a conservative boost factor model. These limits are competitive with those obtained from the Fermi dSph analyses and are in tension with the range of parameter space that can explain the GCE. Moving forward, we plan to investigate the objects with gamma-ray excesses to see if they can be interpreted in the context of astrophysical emission. In so doing, we can also develop more refined metrics for selecting the optimal galaxy groups for DM studies. We thank S. Ando, N. Bahcall, R. Bartels, J. Beacom, P. Behroozi, F. Calore, W. Coulton, A. Drlica-Wagner, D. Hooper, S. Horiuchi, A. Kravtsov, T. Linden, Y. Mao, K. Murase, L. Necib, J. Ostriker, A. Peter, T. Slatyer, B. Tully, R. Wechsler, C. Weniger, and S. Zimmer for helpful conversations. This research made use of the a stropy [66] , ip ython [67] , m inuit [68] , and nptf it [47] software packages. M. L. is supported by the Department of Energy under Contract No. DESC0007968, the Alfred P. Sloan Foundation, and the Cottrell Scholar Program through the Research Corporation for Science Advancement. N. L. R. is supported by the Department of Energy under Contracts No. DESC00012567 and No. DESC0013999. B. R. S. is supported by a Pappalardo Fellowship in Physics at Massachusetts Institute of Technology. This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611. [1] 1 M. Ackermann ( Fermi-LAT Collaboration ) , Phys. Rev. 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Phys. Commun. 10 , 343 ( 1975 ). CPHCBZ 0010-4655 10.1016/0010-4655(75)90039-9 Publisher Copyright: © 2018 American Physical Society.
PY - 2018/3/9
Y1 - 2018/3/9
N2 - We use 413 weeks of publicly available Fermi Pass 8 gamma-ray data combined with recently developed galaxy group catalogs to search for evidence of dark matter annihilation in extragalactic halos. In our study, we use luminosity-based mass estimates and mass-to-concentration relations to infer the J factors and associated uncertainties for hundreds of galaxy groups within a redshift range z≲0.03. We employ a conservative substructure boost factor model, which only enhances the sensitivity by an O(1) factor. No significant evidence for dark matter annihilation is found, and we exclude thermal relic cross sections for dark matter masses below ∼30 GeV to 95% confidence in the bb annihilation channel. These bounds are comparable to those from Milky Way dwarf spheroidal satellite galaxies. The results of our analysis increase the tension but do not rule out the dark matter interpretation of the Galactic Center excess. We provide a catalog of the galaxy groups used in this study and their inferred properties, which can be broadly applied to searches for extragalactic dark matter.
AB - We use 413 weeks of publicly available Fermi Pass 8 gamma-ray data combined with recently developed galaxy group catalogs to search for evidence of dark matter annihilation in extragalactic halos. In our study, we use luminosity-based mass estimates and mass-to-concentration relations to infer the J factors and associated uncertainties for hundreds of galaxy groups within a redshift range z≲0.03. We employ a conservative substructure boost factor model, which only enhances the sensitivity by an O(1) factor. No significant evidence for dark matter annihilation is found, and we exclude thermal relic cross sections for dark matter masses below ∼30 GeV to 95% confidence in the bb annihilation channel. These bounds are comparable to those from Milky Way dwarf spheroidal satellite galaxies. The results of our analysis increase the tension but do not rule out the dark matter interpretation of the Galactic Center excess. We provide a catalog of the galaxy groups used in this study and their inferred properties, which can be broadly applied to searches for extragalactic dark matter.
UR - http://www.scopus.com/inward/record.url?scp=85043697429&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85043697429&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.120.101101
DO - 10.1103/PhysRevLett.120.101101
M3 - Article
C2 - 29570342
AN - SCOPUS:85043697429
SN - 0031-9007
VL - 120
JO - Physical review letters
JF - Physical review letters
IS - 10
M1 - 101101
ER -