Collisions between globular clusters

来源 :国际天文学联合会第312次专题会议 | 被引量 : 0次 | 上传用户:Seasonbaby
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
  The study of globular clusters plays an important role on our understanding of the Universe since these systems are true laboratories for theories of stellar dynamics and evolution.Although the common,traditional astronomical knowledge about these systems picture them as homogeneous polytropes,made of single stellar populations,the detailed photometrical study and chemical tagging of their constituent stars suggest that some are far from being homogeneous systems.The discrepancies from the canonical picture include double(or even triple)main sequences and/or red giant branches,larger than expected internal chemical abundance scatter and unusual horizontal branch showing simultaneously extremely blue and red stars.Some of these non-canonical clusters are now being seen as remmants of the nuclei of former satellite galaxies of the Milky Way.A similar awkward extragallactic globular cluster(Scl-dE1 GC1)in the Sculptor Group dwarf elliptical galaxy Scl-dE1(Sc22),studied by Da Costa et al.has a half-light radius of 21.8 pc,an absolute magnitude of MV=-6.7 and the cluster stellar population appears indistinguishable from that of the parent galaxy.Da Costa et.al suggest that this object might have formed through the merging of star clusters.This scenario for the formation of Scl-dE1 GC1 was succesfully reproduced by Assmann et al.with a particle-mesh code.Since the globular cluster configuration correspond to a relatively small,relaxed gass-free stellar system supported by velocity dispersion,it is likely that a number of different objects,by means of their formation path,could end up as globular-like systems,including some globulars formed by early collisions of other globulars.We here study the outcomes of collisions between globular clusters under the gravitational influence of a larger disk galaxy.We use the NBODY6 direct N-body code by Aarseth to check under which conditions a close encounter of two globulars could disrupt them or lead to a merged,larger globular.We check whether merged globulars have a peculiar luminosity profile right after the merger and how much time it takes for a new relaxation.
其他文献
  The main aim of this article is to verify the structure of advection-dominated accretion flows(ADAFs)along the θ direction when bathed in a toroidal magnet
会议
  Based on the biobehavioral framework of psychoneuroimmunology(PNI),we outline mechanisms underlying health benefits of Tai Chi.The mind-body practices of me
卵泡刺激素受体(follicle-stimulating hormone receptor,FSHR)是一种跨膜糖蛋白,属于G蛋白偶联受体家族成员。在成年人和动物中,FSHR仅在睾丸支持细胞(testicular sertoli cells)和
本研究以泥鳅和大鳞副泥鳅为受试生物,从两种泥鳅的急性毒性、血清生化指标(GPT、GOT酶活)、DNA损伤水平、胚胎孵化率及畸形率等五个方面综合研究了四种除草剂(草威特、百草枯、
  AIM: We investigated the effect of curcumin on depressive-like behaviors in mice with mononeuropathy,and explored the mechanism(s).METHODES: Chronic constri
会议
1 Magnet Hourglass创意玻璃磁力沙漏沙漏象征友谊、爱情和幸福。时间在流逝,事物在变迁,回忆在消失。当思念已无,回忆便成了奢望,所有的美好记忆便尘封在了心底。沙子洒落的
本实验采用稀释平板法研究了褐环乳牛肝菌对油松幼苗根围土壤中微生物数量的影响,并从中分离和筛选出优良的解磷钾细菌对其进行显微观察、生物学鉴定和16SrDNA序列分析;通过
鸡球虫病是由艾美耳球虫寄生于肠道所引起的一种危害极其严重的寄生虫病,严重影响家禽的生长发育,全世界每年因球虫病造成巨大的经济损失。目前,鸡球虫病的防治主要以药物防
  在哺乳动物早期神经发育过程中,假复层结构的神经上皮是进化上高度保守的一个重要特征.具有高度增殖能力的神经上皮细胞的细胞核随着细胞周期时相的不同沿着apical-basal
会议