Search for Dark Matter signatures with MAGIC-I and prospects for MAGIC Phase-II
S. Lombardi, J. Aleksic, J. A. Barrio, A. Biland, M. Doro, D. Elsaesser, M. Gaug, K. Mannheim, M. Mariotti, M. Martinez, D. Nieto, M. Persic, F. Prada, J. Rico,… 展开作者
S. Lombardi, J. Aleksic, J. A. Barrio, A. Biland, M. Doro, D. Elsaesser, M. Gaug, K. Mannheim, M. Mariotti, M. Martinez, D. Nieto, M. Persic, F. Prada, J. Rico, M. Rissi, M. A. Sanchez-Conde, L. S. Stark, F. Zandanel
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Contribution to the 31st ICRC, Lodz, Poland, July 2009
In many Dark Matter (DM) scenarios, the annihilation of DM particles can produce gamma rays with a continuum spectrum that extends up to very high energies of the order of the electroweak symmetry breaking scale (hundreds of GeV). Astrophysical structures supposed to be dynamically dominated by DM, such as dwarf Spheroidal Galaxies, Galaxy Clusters (the largest ones in the local Universe being mostly observable from the northern hemisphere) and Intermediate Mass Black Holes, can be considered as interesting targets to look for DM annihilation with Imaging Atmospheric Cherenkov Telescopes (IACTs). Instead, the center of our Galaxy seems to be strongly contaminated with astrophysical sources. The 17m Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC-I) Telescope, situated in the Canary island of La Palma (2200 m a.s.l.), is best suited for DM searches, due to its unique combination of high sensitivity and low energy threshold among current IACTs which can potentially allow to provide clues on the high energy end, and possibly peak, of the gamma-ray DM-induced spectrum constrained at lower energies with the Fermi Space Telescope. The recent results achieved by MAGIC-I for some of the best candidates, as well as the DM detection prospects for the MAGIC Phase II, are reported.
The Large High Altitude Air Shower Observatory (LHAASO) is a next-generation observatory for high energy gamma rays and cosmic rays with wide field of view. It will detect gamma rays with high sensitivity in the energy range from 300 GeV to 1 PeV. Therefore, it is promising for LHAASO to search for the high-energy gamma rays induced by dark matter (DM) self-annihilation in dwarf spheroidal satellite galaxies (dSphs), which are ideal objects for the DM indirect detection. In this work, we investigate the LHAASO sensitivity to DM self-annihilation signatures for 19 dSphs and take the uncertainti…
Accretion disk signatures in Type I X-ray Bursts: prospects for future missions
来自吸积中子星的I型X射线爆发和超爆发照亮了吸积盘，并产生了反射信号，随着爆发的减弱而演变。研究光谱中反射特征的演变将使我们深入了解爆发-吸积盘相互作用，这是吸积盘物理学的一个潜在的强有力的探测器。目前，仅在两次异常持续时间的爆发期间观察到反射。我们调查的反射签名的可探测性与四个最新的研究X射线天文台的概念：瞳，NICER，雅典娜，和LOFT。突发光谱建模为不同的值的通量，温度和磁盘电离参数，这是最已知的爆发和源的代表。Hitomi类望远镜的有效面积和吞吐量不足以表征爆发反射特征。NICER和Athena将检测具有峰值通量$\ge 10^{-7.5}$ erg cm $^{-2}$ s $^{-1}$的I型爆发中的反射特征，并且还有效地约束在几秒钟的曝光中具有$10^{-7}$ erg cm $^{-2}$ s $^{-1}$的通量的明亮爆发的反射参数。因此，这些天文台将为吸积流和X射线爆发的相互作用提供至关重要的新见解。对于具有低视线吸收的源，这些仪器的宽带通允许检测软X射线反射特征，其对盘金属丰度和密度敏感。作为LOFT设计一部分的大收集区域将通过在整个短爆发中详细追踪吸积几何形状的演变来彻底改变该领域。
Sensitivity for tau neutrinos at PeV energies and beyond with the MAGIC telescopes
MAGIC望远镜位于Roque de los Muchachos天文台（2200 a.s.l.）。在加那利群岛的拉帕尔马，放置在山顶上，从那里在天顶大约5度和方位角80度的可见度窗口在周围海洋的方向上打开。这允许搜索的签名引起的粒子阵雨地球掠过宇宙τ中微子在PeV到EeV的能量范围内产生的海洋。我们研究了MAGIC对这类事件的响应，采用蒙特卡罗模拟的上行τ中微子簇射。对簇射图像的分析表明，τ中微子引起的空气簇射可以与来自相似方向的强子背景区分开来。我们已经计算了点源的接受和预期的事件率，假设传入的τ中微子通量与IceCube测量一致，并为AGN中的光强子相互作用的一般中微子通量的样本。通过对海洋方向约30小时的数据进行分析，得出了在皮埃尔·俄歇天文台下行点源分析的水平上对τ中微子的点源灵敏度。
We present the first search for signatures of brane-world extra-dimensional dark matter (DM) in the very-high-energy gamma-ray band by scrutinizing observations of the dwarf spheroidal galaxy Segue 1 with the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescope system. Branons are new degrees of freedom that appear within flexible brane-world models: they are weakly interacting massive particles and natural DM candidates. The ground-based gamma-ray telescopes MAGIC could indirectly detect branon DM in the multi-TeV mass range by observing secondary products of DM annihilation into Stand…
We investigate gamma-ray emission in the impulsive phase of solar flares and the detectability of non-thermal signatures from protostellar flares. Energetic solar flares emit high-energy gamma rays of GeV energies, but their production mechanism and emission site are still unknown. Young stellar objects, including protostars, also exhibit luminous X-ray flares, but the triggering mechanism of the flaring activity is still unclear due to the strong obscuration. Non-thermal signatures in mm/sub-mm and gamma-ray bands are useful to probe protostellar flares owing to their strong penetration power…
The afterglow emission from gamma-ray bursts (GRBs) is believed to originate from a relativistic blast wave driven into the circumburst medium. Although the afterglow emission from radio up to X-ray frequencies is thought to originate from synchrotron radiation emitted by relativistic, non-thermal electrons accelerated by the blast wave, the origin of the emission at high energies (HE; $\gtrsim$~GeV) remains uncertain. The recent detection of sub-TeV emission from GRB~190114C by MAGIC raises further debate on what powers the very high-energy (VHE; $\gtrsim 300$GeV) emission. Here, we explore t…
Search for tau neutrinos at PeV energies and beyond with the MAGIC telescopes
MAGIC望远镜位于Roque de los Muchachos天文台（2200 a.s.l.）。在加那利群岛的拉帕尔马，放置在山顶上，从那里在天顶大约5度和方位角80度的可见度窗口在周围海洋的方向上打开。这允许搜索的签名引起的粒子阵雨地球掠过宇宙τ中微子在PeV到EeV的能量范围内产生的海洋。我们研究了MAGIC对这类事件的响应，采用蒙特卡罗模拟的上行τ中微子簇射。对簇射图像的分析表明，τ中微子引起的空气簇射可以与来自相似方向的强子背景区分开来。我们已经计算了点源的接受和预期的事件率，为样本的一般中微子通量的光强子相互作用在活动星系核。如果MAGIC将AUGER观测时间专用于类似的数量，则对向海洋采集的约30小时数据的分析导致了在Pierre Auger天文台的下行点源分析水平上的τ中微子的点源灵敏度。
With the growing interest in indirect detection for dark matter signature, the thesis aims to investigate the signal originating from the self-annihilation of dark matter candidates. The methods for targeting the dark matter signal are two-fold, on one hand, we explore the gamma rays resulting from dark matter particles. On the other hand, we focus on complementary radio properties.
We review the prospects for detecting quark matter in neutron star cores. We survey the proposed signatures and emphasize the importance of data from neutron star mergers, which provide access to dynamical properties that operate on short timescales that are not probed by other neutron star observables.
(also inside: this manuscript introduces the reader to the argument against the existence of magnetic monopoles, which forms an essential part of Staruszkiewicz's Quantum Mechanics of the Electric Charge) Ultra-high energy (UHE) photons with energies exceeding $10^{18}\eV$ can potentially be observed. They are produced in various processes involving electrically charged particles. However, more exotic scenarios are also possible. UHE photons could be emitted in encounters of massive magnetically charged monopole--antimonopole pairs or in processes associated with monopoles accelerated to high …
Gravitational Wave Signatures of Quasi-Periodic Eruptions: LISA Detection Prospects for RX J1301.9+2747
The University of Hong Kong（香港大学）；Beijing Institute of Mathematical Sciences and Applications（北京数学科学研究所）；Tata Institute of Fundamental Research（塔塔基础研究所）
Cosmological and astrophysical observations suggest that 85\% of the total matter of the Universe is made of Dark Matter (DM). However, its nature remains one of the most challenging and fundamental open questions of particle physics. Assuming particle DM, this exotic form of matter cannot consist of Standard Model (SM) particles. Many models have been developed to attempt unraveling the nature of DM such as Weakly Interacting Massive Particles (WIMPs), the most favored particle candidates. WIMP annihilations and decay could produce SM particles which in turn hadronize and decay to give SM sec…
