The Fermi-LAT GeV excess as a tracer of stellar mass in the Galactic bulge - INSPIRE

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The Fermi-LAT GeV excess as a tracer of stellar mass in the Galactic bulge

Richard Bartels
(
- U. Amsterdam, GRAPPA
)
,
Emma Storm
(
- U. Amsterdam, GRAPPA
)
,
Christoph Weniger
(
- U. Amsterdam, GRAPPA
)
,
Francesca Calore
(
- Annecy, LAPTH
)

Nov 13, 2017

10 pages

Published in:

Nature Astron. 2 (2018) 10, 819-828

Published: Aug 6, 2018

e-Print:

1711.04778 [astro-ph.HE]

DOI:

10.1038/s41550-018-0531-z (publication)

View in:

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Abstract: (Springer)

An anomalous emission component at energies of a few gigaelectronvolts and located towards the inner Galaxy is present in the Fermi-LAT data. At present, the two most promising explanations are the annihilation of dark matter particles or the presence of a large population of unresolved point sources, most probably millisecond pulsars, at the Galactic Centre. Here, we report an analysis of the excess characteristics using almost eight years of Pass 8 ULTRACLEAN Fermi-LAT data with SkyFACT—a tool that combines image reconstruction with template-fitting techniques. We find that an emission profile that traces stellar mass in the boxy and nuclear bulge is preferred over conventional dark matter profiles. A model including the bulge is favoured over a model with dark matter at 16σ.

Note:

7 pages, 4 figures, 1 table + supplemental material

galaxy
GLAST
nucleus
dark matter: relic density
statistical
mass ratio
numerical calculations

References(89)

Figures(8)

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Lisa Goodenough
(
- New York U., CCPP
)
,
Dan Hooper
(
- Fermilab and
- Chicago U., Astron. Astrophys. Ctr.
)

e-Print:
- 0910.2998

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Francesca Calore
(
- U. Amsterdam, GRAPPA
)
,
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(
- Fermilab
)
,
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(
- U. Amsterdam, GRAPPA
)

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)

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- 1511.02938
•
DOI:
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Francesca Calore
(
- U. Amsterdam, GRAPPA
)
,
Ilias Cholis
(
- Fermilab
)
,
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(
- U. Amsterdam, GRAPPA
)
,
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(
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)

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Eric Carlson
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)
,
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)
,
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(
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)

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Tim Linden
(
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)
,
Nicholas L. Rodd
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- MIT, Cambridge, CTP
)
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)
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Daniele Gaggero
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- INFN, Pisa and
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)
,
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)
,
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)
,
Mauro Valli
(
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)
,
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(
- INFN, Trieste and
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)

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Kevork N. Abazajian
(
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)

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•
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Samuel K. Lee
(
- Princeton U., CTP and
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)
,
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(
- Princeton U.
)
,
Benjamin R. Safdi
(
- MIT
)
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)
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(
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)

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M. Ajello
(
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)

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e-Print:
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M. Ajello
(
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)

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e-Print:
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Sascha Caron
(
- Nijmegen U., IMAPP and
- NIKHEF, Amsterdam
)
,
Germán A. Gómez-Vargas
(
- Chile U., Catolica
)
,
Luc Hendriks
(
- Nijmegen U., IMAPP
)
,
Roberto Ruiz de Austri
(
- Valencia U., IFIC
)

- JCAP 05 (2018) 058
•
e-Print:
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•
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Francesca Calore
(
- U. Amsterdam, GRAPPA
)
,
Mattia Di Mauro
(
- SLAC and
- Stanford U., Phys. Dept.
)
,
Fiorenza Donato
(
- INFN, Turin and
- Turin U.
)
,
Jason W. T. Hessels
(
- ASTRON, Dwingeloo and
- Amsterdam U., Astron. Inst.
)
,
Christoph Weniger
(
- U. Amsterdam, GRAPPA
)

- Astrophys.J. 827 (2016) 2, 143
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e-Print:
- 1512.06825
•
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