Robust inference of the Galactic Centre gamma-ray excess spatial properties

被引：10

作者：

Song, Deheng ^{[1
]}

Eckner, Christopher ^{[2
,3
,4
]}

Gordon, Chris ^{[5
]}

Calore, Francesca ^{[3
]}

Macias, Oscar ^{[6
,7
]}

Abazajian, Kevork N. ^{[8
]}

Horiuchi, Shunsaku ^{[9
,10
]}

Kaplinghat, Manoj ^{[8
]}

Pohl, Martin ^{[11
,12
]}

机构：

[1] Kyoto Univ, Yukawa Inst Theoret Phys, Ctr Gravitat Phys & Quantum Informat, Kyoto 6068502, Japan

[2] Univ Nova Gorica, Ctr Astrophys & Cosmol, Vipavska 11c, Ajdovscina 5270, Slovenia

[3] CNRS, USMB, LAPTh, F-74940 Annecy, France

[4] CNRS, USMB, LAPP, F-74940 Annecy, France

[5] Univ Canterbury, Sch Phys & Chem Sci, Christchurch 8041, New Zealand

[6] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA

[7] Univ Amsterdam, GRAPPA Inst, NL-1098 XH Amsterdam, Netherlands

[8] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[9] Virginia Tech, Ctr Neutrino Phys, Dept Phys, Blacksburg, VA 24061 USA

[10] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Chiba 2778583, Japan

[11] Deutsch Elektronen Synchrotron DESY, Platanenallee 6, D-15738 Zeuthen, Germany

[12] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 530卷 / 04期

关键词：

astroparticle physics; pulsars: general; Galaxy: bulge; local interstellar matter; dark matter; gamma-rays: diffuse background; FERMI-LAT OBSERVATIONS; LARGE-AREA TELESCOPE; DARK-MATTER; MILKY-WAY; BAYESIAN-INFERENCE; NUCLEAR BULGE; COSMIC-RAY; MODEL; EMISSION; CONSTRAINTS;

D O I：

10.1093/mnras/stae923

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The gamma-ray Fermi-LAT Galactic Centre excess (GCE) has puzzled scientists for over 15 yr. Despite ongoing debates about its properties, and especially its spatial distribution, its nature remains elusive. We scrutinize how the estimated spatial morphology of this excess depends on models for the Galactic diffuse emission, focusing particularly on the extent to which the Galactic plane and point sources are masked. Our main aim is to compare a spherically symmetric morphology - potentially arising from the annihilation of dark matter (DM) particles - with a boxy morphology - expected if faint unresolved sources in the Galactic bulge dominate the excess emission. Recent claims favouring a DM-motivated template for the GCE are shown to rely on a specific Galactic bulge template, which performs worse than other templates for the Galactic bulge. We find that a non-parametric model of the Galactic bulge derived from the VISTA Variables in the Via Lactea survey results in a significantly better fit for the GCE than DM-motivated templates. This result is independent of whether a galprop-based model or a more non-parametric ring-based model is used to describe the diffuse Galactic emission. This conclusion remains true even when additional freedom is added in the background models, allowing for non-parametric modulation of the model components and substantially improving the fit quality. When adopted, optimized background models provide robust results in terms of preference for a boxy bulge morphology for the GCE, regardless of the mask applied to the Galactic plane.

引用

页码：4395 / 4411

页数：17

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