2018MNRAS.475.5313F


Query : 2018MNRAS.475.5313F

2018MNRAS.475.5313F - Mon. Not. R. Astron. Soc., 475, 5313-5321 (2018/April-3)

Disrupted globular clusters and the gamma-ray excess in the Galactic Centre.

FRAGIONE G., ANTONINI F. and GNEDIN O.Y.

Abstract (from CDS):

The Fermi Large Area Telescope has provided the most detailed view towards the Galactic Centre (GC) in high-energy gamma-rays. Besides the interstellar emission and point source contributions, the data suggest a residual diffuse gamma-ray excess. The similarity of its spatial distribution with the expected profile of dark matter has led to claims that this may be evidence for dark matter particle annihilation. Here, we investigate an alternative explanation that the signal originates from millisecond pulsars (MSPs) formed in dense globular clusters and deposited at the GC as a consequence of cluster inspiral and tidal disruption. We use a semi-analytical model to calculate the formation, migration, and disruption of globular clusters in the Galaxy. Our model reproduces the mass of the nuclear star cluster and the present-day radial and mass distribution of globular clusters. For the first time, we calculate the evolution of MSPs from disrupted globular clusters throughout the age of the Galaxy and consistently include the effect of the MSP spin-down due to magnetic-dipole braking. The final gamma-ray amplitude and spatial distribution are in good agreement with the Fermi observations and provide a natural astrophysical explanation for the GC excess.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): pulsars: general - Galaxy: centre - Galaxy: kinematics and dynamics - galaxies: star clusters: general - gamma-rays: diffuse background - gamma-rays: galaxies

Simbad objects: 27

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Number of rows : 27
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3653 0
2 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1296 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3120 0
4 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1829 0
5 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 648 0
6 NGC 6139 GlC 16 27 39.987 -38 50 57.03   11.03 9.68     ~ 186 0
7 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 604 0
8 M 62 GlC 17 01 12.60 -30 06 44.5   8.55 7.39     ~ 540 0
9 NGC 6316 GlC 17 16 37.42 -28 08 24.0   10.33 9.03     ~ 183 0
10 NGC 6342 GlC 17 21 10.14 -19 35 14.7   11.25 10.01     ~ 254 0
11 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 836 1
12 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1844 1
13 ESO 520-21 GlC 17 43 42.20 -26 13 21.0           ~ 154 0
14 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12317 0
15 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 730 1
16 NGC 6440 GlC 17 48 52.67 -20 21 34.5   12.01 10.10     ~ 490 1
17 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 797 0
18 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 338 1
19 NAME 2MASS-GC01 GlC 18 08 21.8 -19 49 47           ~ 42 0
20 NAME 2MASS-GC02 GlC 18 09 36.5 -20 46 44           ~ 39 0
21 GLIMPSE C02 GlC 18 18 30.5 -16 58 38           ~ 13 0
22 NGC 6652 GlC 18 35 45.63 -32 59 26.6   10.64 9.75     ~ 369 0
23 GLIMPSE C01 GlC 18 48 49.7 -01 29 50           ~ 37 0
24 NGC 6717 GlC 18 55 06.04 -22 42 05.3   11.29 10.35     ~ 209 0
25 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1856 0
26 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2969 0
27 NAME Galactic Bulge reg ~ ~           ~ 3635 0

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2021.08.03-12:29:03

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