The Galactic Centre (GC) is a unique place to study the extreme dynamical processes occurring near a super-massive black hole (SMBH). Here we investigate the role of supernova (SN) explosions occurring in massive binary systems lying in a disc-like structure within the innermost parsec. We use a regularized algorithm to simulate 30,000 isolated three-body systems composed of a stellar binary orbiting the SMBH. We start the integration when the primary member undergoes a SN explosion, and we analyze the impact of SN kicks on the orbits of stars and compact remnants. We find that SN explosions scatter the lighter stars in the pair on completely different orbits, with higher eccentricity and inclination. In contrast, stellar-mass black holes (BHs) and massive stars retain memory of the orbit of their progenitor star. Our results suggest that SN kicks are not sufficient to eject BHs from the GC. We thus predict that all BHs that form in situ in the central parsec of our Galaxy remain in the GC, building up a cluster of dark remnants. In addition, the change of NS orbits induced by SNe may partially account for the observed dearth of NSs in the GC. About 40 per cent of remnants stay bound to the stellar companion after the kick; we expect up to 70 per cent of them might become X-ray binaries through Roche-lobe filling. Finally, the eccentricity of some light stars becomes > 0.7 as an effect of the SN kick, producing orbits similar to those of the G1 and G2 dusty objects.
Implications of recoil kicks for black hole mergers from LIGO/Virgo catalogs
LIGO/Virgo合作的第一和第二个引力波瞬态目录包括$50$确认的合并事件,来自第一,第二和第三次观测运行的前半部分。我们计算反冲踢的分布赋予合并残余物和估计其保留概率在各种天体物理环境中的最大祖自旋($χ_{\rm max}$)的函数,假设LIGO/处女座二进制黑洞(BBH)合并催化的动态组装在一个致密的星团。我们发现,对于$0.1$,$0.3$,$0.5$,$0.8$的最大祖自旋,平均反冲分布分别在$150$ km s $^{-1}$,$250$ km s $^{-1}$,$350$ km s $^{-1}$,$600$ km s $^{-1}$附近达到峰值.只有逃逸速度为$\gtrsim 100$ km s $^{-1}$的环境,如在银河系核星团以及最大质量的球状星团和超级星团中发现的那样,才能有效地保留LIGO/室女座BBH人口的合并残余,即使是低祖先自旋($χ_{\rm max}=0.1$)。在高祖先自旋($χ_{\rm max}\gtrsim 0.5$)的情况下,只有质量最大的核星团才能保留合并产物。我们还发现,如果GW 170729,GW 190412,GW 190519和GW 190620的祖先是中等自旋($χ_{\rm max}\gtrsim 0.3$),而GW 190517的祖先是快速自旋($χ_{\rm max}\gtrsim 0.8$),则可以再现有效自…
A hyper-runaway white dwarf in Gaia DR2 as a Type Iax supernova primary remnant candidate
观测与Ia型和Iax型超新星有关的恒星残骸对于充分了解它们的祖先是必要的。多个祖先的情况下预测人口踢供体残留物和部分燃烧的初级残留物,都以相对较高的速度移动。但只有少数的例子符合这两个预测的人口已被观察到。在这里,我们报告了可能是第一个已知的例子,一个未绑定的白矮星,这是一致的完全冷却的主要遗迹,以Iax型超新星。候选天体LP 93-21以银河系中心速度v $_{gal}$ $\simeq$ 605 km s $^{-1}$运行,并且引力与银河系无关。我们排除了银河系外的起源。Iax型超新星喷发的情况与其独特的未绑定轨迹是一致的,因为通过光谱跟踪在其光球层中检测到异常元素丰度。这一发现反映了最近的模型,该模型表明恒星喷射可能经常发生。不幸的是,由于白矮星本身的微弱性,以及与它们的直接祖先系统相关的不确定性,使得探测和确认这样的供体变得困难。
How to create Sgr A East: Where did the supernova explode?
Sgr A East是距离银河系中心最近的超新星遗迹。它的年龄估计是非常年轻的,大约1-2 kyr,或大约10 kyr,其确切的起源仍然不清楚。我们渴望创建一个简单的超新星爆炸模型,重现Sgr A East的形状,大小和位置。使用简化的流体动力学代码,我们模拟了银河系中心周围介质中超新星遗迹的演化。后者由附近的大质量分子云和来自核星团的风组成,已知Sgr A East与之相互作用。我们首选的Sgr A东遗迹模型与大约10 kyr的年龄相一致。我们也为老年人找到合适的解决方案,但不适用于5岁以下的人。我们的模拟预测,超新星爆炸距离银河系中心约3.5 pc,低于银河系平面,略向东从中心和3 pc背后。
Detection of knots in the supernova type Iax remnant Pa 30
Center for Astrophysics — Harvard & Smithsonian(哈佛-史密森尼天体物理中心);Department of Physics, University of Warwick(华威大学物理系);Institute of Science and Technology Austria(奥地利科学与技术研究所)
The Nearest Galactic Nucleus: Studying the Galactic Centre with SKA-Mid
Northwestern University(西北大学);Max-Planck-Institute for Radio Astronomy(马克斯·普朗克射电天文研究所);University of California Los Angeles(加州大学洛杉矶分校);University of Oxford(牛津大学);University of Hertfordshire(赫特福德大学);Astrophysics Research Institute, Liverpool John Moores University(利物浦约翰摩尔斯大学天体物理研究所);Cosmic Origins Of Life (COOL) Research DAO(宇宙生命起源(COOL)研究去中心化自治组织);Rhodes University(罗德岛大学);Institute for Research in Fundamental Sciences (IPM)(基础科学研究所);Tata Institute of Fundamental Research(塔塔基础研究所);Masaryk University(马萨里克大学);Charles University(查理大学)
Revisiting the missing mass problem in MOND for nearby galaxy clusters
Helmholtz-Institut für Strahlen-und Kernphysik (HISKP), Universität Bonn(波恩大学亥姆霍兹辐射与核物理研究所);Department of Physics, Institute for Advanced Studies in Basic Sciences (IASBS)(基础科学高等研究院物理系);Charles University in Prague, Faculty of Mathematics and Physics, Astronomical Institute(布拉格查理大学数学物理学院天文研究所)