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Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look
Eckner, Christopher1; Hou X(侯贤)2,3,4; Serpico, Pasquale D.5; Winter, Miles6; Zaharijas, Gabrijela1,7; Martin, Pierrick8; di Mauro, Mattia9; Mirabal, Nestor10,11; Petrovic, Jovana12; Prodanovic, Tijana12; Vandenbroucke, Justin5; Eckner, Christopher, Email: christopher.eckner@ung.si; Hou X(侯贤), Email: xianhou.astro@gmail.com; Serpico, Pasquale D., Email: serpico@lapth.cnrs.fr; Zaharijas, Gabrijela, Email: gabrijela.zaharijas@ung.si
发表期刊ASTROPHYSICAL JOURNAL
2018-07-20
卷号862期号:1
DOI10.3847/1538-4357/aac029
产权排序第2完成单位
收录类别SCI
关键词Gamma Rays: Galaxies Local Group Pulsars: General
摘要A new measurement of a spatially extended gamma-ray signal from the center of the Andromeda galaxy (M31) has recently been published by the Fermi-LAT collaboration, reporting that the emission broadly resembles the so-called Galactic center excess (GCE) of the Milky Way (MW). The weight of the evidence is steadily accumulating on a millisecond pulsar (MSPs) origin for the GCE. These elements prompt us to compare these observations with what is, perhaps, the simplest model for an MSP population, which is solely obtained by rescaling of the MSP luminosity function that is determined in the local MW disk via the respective stellar mass of the systems. Remarkably, we find that without free fitting parameters, this model can account for both the energetics and the morphology of the GCE within uncertainties. For M31, the estimated luminosity due to primordial MSPs is expected to only contribute about a quarter of the detected emission, although a stronger contribution cannot be excluded given the large uncertainties. If correct, the model predicts that the M31 disk emission due to MSPs is not far below the present upper bound. We also discuss additional refinements of this simple model. Using the correlation between globular cluster gamma-ray luminosity and stellar encounter rate, we gauge the dynamical MSP formation in the bulge. This component is expected to contribute to the GCE only at a level of less than or similar to 5%, it could affect the signal's morphology. We also comment on the limitations of our model and on future perspectives for improved diagnostics.
项目资助者NASA(81303) ; National Natural Science Foundation of China(11503078, 11661161010, 11673060) ; Centre National dEtudes Spatiales ; Agence Nationale de la Recherche(ANR-15-IDEX-02)
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000439959500003
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ANNIHILATING DARK-MATTER ; LARGE-AREA TELESCOPE ; GLOBULAR-CLUSTERS ; MILKY-WAY ; DYNAMICAL FORMATION ; BULGE ; M31 ; STELLAR ; POPULATION ; NUCLEUS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/17388
专题高能天体物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Eckner, Christopher, Email: christopher.eckner@ung.si; Hou X(侯贤), Email: xianhou.astro@gmail.com; Serpico, Pasquale D., Email: serpico@lapth.cnrs.fr; Zaharijas, Gabrijela, Email: gabrijela.zaharijas@ung.si
作者单位1.Laboratory for Astroparticle Physics, University of Nova Gorica, Vipavska 13, SI-5000 Nova Gorica, Slovenia
2.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, People's Republic of China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, People's Republic of China
4.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, People's Republic of China
5.LAPTh, Université Savoie Mont Blanc & CNRS, F-74941 Annecy Cedex, France
6.University of Wisconsin, Madison, 500 Lincoln Drive, Madison, WI 53706, USA
7.Istituto Nazionale di Fisica Nucleare—Sezione Trieste, Padriciano 99, I-34149 Trieste, Italy
8.Institut de Recherche en Astrophysique et Planétologie, CNRS-INSU, Université Paul Sabatier, 9 avenue Colonel Roche, BP 44346, F-31028 Toulouse Cedex 4, France
9.W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA
10.CRESST/CSST/Department of Physics, UMBC, Baltimore, MD 21250, USA
11.NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
12.Department of Physics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 4, 21000 Novi Sad, Serbia
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Eckner, Christopher,Hou X,Serpico, Pasquale D.,et al. Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look[J]. ASTROPHYSICAL JOURNAL,2018,862(1).
APA Eckner, Christopher.,Hou X.,Serpico, Pasquale D..,Winter, Miles.,Zaharijas, Gabrijela.,...&Zaharijas, Gabrijela, Email: gabrijela.zaharijas@ung.si.(2018).Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look.ASTROPHYSICAL JOURNAL,862(1).
MLA Eckner, Christopher,et al."Millisecond Pulsar Origin of the Galactic Center Excess and Extended Gamma-Ray Emission from Andromeda: A Closer Look".ASTROPHYSICAL JOURNAL 862.1(2018).
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