Searching for dark matter sub-structure with HAWC-猫眼课题宝

DOI：

10.1088/1475-7516/2019/07/022

发表时间：

2018-11

期刊：

Journal of Cosmology and Astroparticle Physics

影响因子：

6.4

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

A. Abeysekara;A. Albert;R. Alfaro;C. Álvarez;R. Arceo;J. C. Arteaga-Velázquez;D. Rojas;H. Solares;E. Belmont-Moreno;S. BenZvi;C. Brisbois;K. Caballero-Mora;A. Carramiñana;S. Casanova;J. Cotzomi;S. D. de León;C. D. Le'on;E. D. L. Fuente;S. Dichiara;B. Dingus;M. DuVernois;J. C. Díaz-Vélez;K. Engel;C. Espinoza;H. Fleischhack;N. Fraija;A. Galv'an-G'amez;J. García-González;M. González;J. Goodman;J. P. Harding;B. Hona;F. Hueyotl-Zahuantitla;P. Hüntemeyer;A. Iriarte;A. Lara;W.H. Lee;H. L. Vargas;J. Linnemann;A. Longinotti;G. Luis-Raya;J. Lundeen;K. Malone;S. Marinelli;O. Martinez;I. Martinez-Castellanos;J. Mart'inez-Castro;J. Matthews;P. Miranda-Romagnoli;E. Moreno;M. Mostaf'a;A. Nayerhoda;L. Nellen;M. Newbold;M. Nisa;R. Noriega-Papaqui;E. Pérez-Pérez-E.-Pérez-Pérez-1431205495;Z. Ren;C. Rho;C. Rivière;D. Rosa-Gonz'alez;M. Rosenberg;H. Salazar;F. Greus;A. Sandoval;M. Schneider;G. Sinnis;A.J. Smith;R. Springer;K. Tollefson;I. Torres;G. Vianello;T. Weisgarber;J. Wood;T. Yapici;A. Zepeda;H. Zhou;J. Álvarez

数值模拟表明，星系周围的暗物质晕中可能存在许多超密度或亚密度晕。这些次晕中最大的质量可以以矮星系的形式被光学观测到。然而，大多数较低质量的次晕被预测为暗矮星系：次晕像矮星系，没有发光的对应物。从暗物质湮灭产生的伽马射线信号中探测这些看不见的子晕是可能的。高海拔水切伦科夫天文台（HAWC）是一个非常高的能量（500 GeV到>100 TeV）伽马射线探测器，具有宽视场和接近连续的占空比，使HAWC成为无偏天空调查的理想选择。我们用HAWC对银河系晕中的暗矮星进行了γ射线信号的搜寻。我们进行有针对性的搜索HAWC伽马射线源，没有已知的关联与低能量的同行，基于对整个天空的公正调查。由于没有发现强烈倾向于暗物质模型的来源，我们计算了HAWC观察暗矮星的能力。我们还计算了HAWC的灵敏度潜在的未来检测一个给定的模型的暗物质子结构。假设是热暗物质，我们发现对于一组特定的暗物质假设，达到HAWC探测标准所需的暗矮星的J因子为5.79× 1020 GeV 2 cm−5 sr。HAWC被发现能够竞争性地限制暗物质湮灭，从发现的晕与J因子在1019 GeV 2 cm−5 sr或更大的尺度上，与更好的限制获得暗物质模型与>10 TeV的质量和来源，过境开销。

Numerical simulations show that the dark matter halos surrounding galaxies are expected to contain many over-densities or sub-halos. The most massive of these sub-halos can be optically observed in the form of dwarf galaxies. However, most lower mass sub-halos are predicted to exist as dark dwarf galaxies: sub-halos like dwarf galaxies with no luminous counterpart. It may be possible to detect these unseen sub-halos from gamma-ray signals originating from dark matter annihilation. The High Altitude Water Cherenkov Observatory (HAWC) is a very high energy (500 GeV to >100 TeV) gamma ray detector with a wide field-of-view and near continuous duty cycle, making HAWC ideal for unbiased sky surveys. We perform a search for gamma ray signals from dark dwarfs in the Milky Way halo with HAWC. We perform a targeted search of HAWC gamma-ray sources which have no known association with lower-energy counterparts, based on an unbiased survey of the entire sky. With no sources found to strongly prefer dark matter models, we calculate the ability of HAWC to observe dark dwarfs. We also compute the HAWC sensitivity to potential future detections for a given model of dark matter substructure. Assuming thermal dark matter, we find the corresponding J-factor of a dark dwarf required to reach the HAWC detection criterion is 5.79× 1020 GeV2 cm−5 sr for one particular set of dark matter assumptions. HAWC is found to be able to competitively constrain dark matter annihilation from discovered halos with J-factors on the scale of 1019 GeV2 cm−5 sr or greater, with better constraints obtained on dark matter models with >10 TeV masses and sources that transit overhead.

Searching for dark matter sub-structure with HAWC

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