检索结果-南通市图书馆

An efficient method to identify galaxy clusters by using SuperCOSMOS,2MASS and WISE data

Science China(Physics,Mechanics & Astronomy) 2014年第11期57卷 2168-2173页

作者： XU WeiWei WEN ZhongLue HAN JinLin National Astronomical Observatories Chinese Academy of Sciences University of Chinese Academy of Sciences

The survey data of Wide-field Infrared Survey Explorer(WISE)provide an opportunity for the identification of galaxy *** present an efficient method for detecting galaxy clusters by combining the WISE data with SuperCOSMOS and 2MASS *** performing star-galaxy separation,we calculate the number of companion galaxies around the galaxies with photometric redshifts previously estimated by the SuperCOSMOS,2MASS and WISE data.A scaled richness Rscal 30 is set as a criterion to identify *** a sky area of 275 deg2of the Sloan Digital Sky Survey Stripe 82 region,we identify 302 clusters in the redshift range of 0.1galaxy clusters by using the all sky data of the SuperCOSMOS,2MASS and WISE.

关键词： infrared galaxy clusters redshifts

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Simulation of the Dependence of Tidal Interaction on galaxy Type in Compact Groups

引用

International Journal of Astronomy and Astrophysics 2024年第2期14卷 85-100页

作者： Mark J. Henriksen Mateo Mejia Department of Physics University of Maryland Baltimore USA

We have investigated the role that different galaxy types have in galaxy-galaxy interactions in compact groups. N-body simulations of 6 galaxies consisting of a differing mixture of galaxy types were run to compare the relative importance of galaxy population demographic on evolution. Three different groups with differing galaxy content were tested: all spiral, a single elliptical and 50% elliptical. Tidal interaction strength and duration were recorded to assess the importance of an interaction. A group with an equal number of spiral and elliptical galaxies has some of the longest and strongest interactions with elliptical-elliptical interactions being most significant. These elliptical-elliptical interactions are not dominated by a single large event but consist of multiple interactions. Elliptical galaxies tidally interacting with spiral galaxies, have the next strongest interaction events. For the case when a group only has a single elliptical, the largest magnitude tidal interaction is an elliptical on a spiral. Spirals interact with each other through many small interactions. For a spiral only group, the interactions are the weakest compared to the other group types. These spiral interactions are not dominated by any singular event that might be expected to lead to a merger but are more of an ongoing harassment. These results suggest that within a compact group, early type galaxies will not form via merger out of an assemblage of spiral galaxies but rather that compact groups, in effect form around an early type galaxy.

关键词： galaxy Groups galaxy clusters galaxy Evolution N-Body Simulations

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Conjecture on the Origin of Dark Energy

引用

Chinese Physics Letters 2005年第3期22卷 783-784页

作者：高山 InstituteofElectronics ChineseAcademyofSciencesBeijing100080

A conjecture on the origin of the dark energy in our universe is proposed. The analysis indicates that the dark energy may originate from the quantum fluctuations of space-time limited in our universe. Applying both the uncertainty principle and the holographic principle, the author finds that the density of such quantum fluctuation energy is pv = 3c(4)/32GL(H)(2), where L-H is the size of the event horizon of our universe and G is the gravitational constant. Using this dark energy model which contains no adjustable parameters, we obtain the current fraction Omega(Lambda) &3bond; pv/p(c) approximate to pi/4 and the corresponding equation of state w(z) approximate to -1 + (1 - pi/4)z with p, being the critical energy density. These theoretical results are perfectly consistent with the recent cosmological observations. The striking coincidence implies that the quantum fluctuation energy of space-time may be the only source of dark energy. In addition, the analysis shows that the vacuum fluctuation energy does exist, but it comes from space time rather than matter. This may have some deep implications for discrete space-time and quantum gravity.

关键词： HUBBLE-SPACE-TELESCOPE ACCELERATING UNIVERSE galaxy clusters KEY PROJECT CONSTRAINTS CONSTANT SUPERNOVAE SCALE Hubble Space Telescope Constraint Uncertainty principle Constants EVENT HORIZON galaxy clusters Universe Spacetime Conjecture Dark energy cosmic acceleration scales fluctuations

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Discovery of eight lensing clusters of galaxies

引用

Science China(Physics,Mechanics & Astronomy) 2014年第9期57卷 1809-1815页

作者： LIANG SuMing WEN ZhongLue HAN JinLin JIANG YunYing National Astronomical Observatories Chinese Academy of Sciences The University of Chinese Academy of Sciences

clusters of galaxies have a huge mass which can act as gravitational *** behind clusters can be distorted by the lenses to form arcs in *** a search was done for giant lensed arcs using the SDSS *** visually inspecting SDSS images of newly identified clusters in the SDSS DR8 and Stripe 82 data,we discover 8 strong lensing clusters together with additional 3probable and 6 possible *** lensed arcs show bluer colors than the member galaxies of *** masses and optical luminosities of galaxy clusters interior to the arcs are *** mass-to-light ratios are found to be in the range of a few tens of M⊙/L⊙,consistent with the distribution of previously known lensing clusters.

关键词： galaxy clusters gravitational lenses and luminous arcs photography and photometry

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：