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The UVJ Selection of Quiescent and Star Forming Galaxies: Separating Early and Late-Type Galaxies and Isolating Edge-on Spirals
Star Forming Galaxies: Separating Early Late-Type Galaxies Isolating Edge-on Spirals
2011/10/10
We utilize for the first time HST ACS imaging to examine the structural properties of galaxies in the rest-frame U-V versus V-J diagram (i.e., the UVJ diagram) using a sample at 0.6
A hidden radio halo in A1682?
galaxies: clusters: general – galaxies: clusters: individual: A1682 – radio continuum: general
2011/10/8
High sensitivity observations of radio halos in galaxy clusters at frequencies lower than 330 MHz are still relatively rare, and very little is known compared to the classical 1.4 GHz images. The few ...
New Method for Exploring Super-Eddington AGNs by Near-infrared Observations
accretion: accretion disc—black hole physics— galaxies:active
2011/10/8
We propose a new method to explore the candidate super-Eddington active galactic nuclei (AGNs). We examine the properties of infrared (IR) emission from the inner edge of the dusty torus in AGNs, whic...
Dual-Frequency Observations of 140 Compact, Flat-Spectrum Active Galactic Nuclei for Scintillation-Induced Variability
Flat-Spectrum Active Galactic Nuclei Variability
2011/10/8
The 4.9 GHz Micro-Arcsecond Scintillation-Induced Variability (MASIV) Survey detected a drop in Interstellar Scintillation (ISS) for sources at redshifts z > 2, indicating an apparent increase in angu...
AGN Unification at z ~ 1: u - R Colors and Gradients in X-ray AGN Hosts
Unification Colors Gradients Hosts
2011/10/8
We present uncontaminated rest-frame u - R colors of 78 X-ray-selected AGN hosts at 0.5 < z < 1.5 in the Chandra Deep Fields measured with HST/ACS/NICMOS and VLT/ISAAC imaging. We also present spatial...
Black Hole growth and AGN obscuration by instability-driven inflows in high-redshift disk galaxies fed by cold streams
instability-driven inflows high-redshift disk galaxies cold streams
2011/9/29
Disk galaxies at high redshift have been predicted to maintain high gas surface densities due to continuous feeding by intense cold streams leading to violent gravitational instability, transient feat...
Spectroscopic confirmation of z~7 LBGs: probing the earliest galaxies and the epoch of reionization
Spectroscopic confirmation earliest galaxies epoch reionization
2011/9/29
We present the final results from our ultra-deep spectroscopic campaign with FORS2 at the ESO/VLT for the confirmation of z~7 "z--band dropout" candidates selected from our VLT/Hawk-I imaging survey o...
A non-ideal MHD Gadget: Simulating massive galaxy clusters
MHD - magnetic fi elds - methods: numerical - galax- ies: clusters
2011/9/28
Magnetic fields in the intra-cluster medium of galaxy clusters have been studied in the past years through different methods. In the next years the up-coming generation of radio telescopes is going to...
星系际弥散恒星成分研究进展
星系团 弥散恒星 星系形成与演化
2012/9/12
对于星系际弥散恒星的研究是分别从观测、数值模拟和半解析模型这三个方面进行的。现在已经在邻近星系团及中低红移处观测到弥散恒星,甚至在Virgo及Coma星系团中观测到了单个的弥散恒星。观测数据的积累使得人们能够从统计上了解星系际弥散恒星的性质。研究表明星系际弥散恒星围绕着星系团势阱中心呈椭球状对称分布,其在星系团恒星总质量中所占比例在10%～30%的范围内,和星系团总质量的关系不大,但是和星系团的富...
Star Formation Properties in Barred Galaxies(SFB). I. Ultraviolet-to-Infrared Imaging and Spectroscopic Studies of NGC 7479
Formation Properties Spectroscopic Studies
2011/9/26
Large-scale bars and minor mergers are important drivers for the secular evolution of galaxies. Based on ground-based optical images and spectra as well as ultraviolet data from the Galaxy Evolution E...
Subaru weak-lensing study of A2163: bimodal mass structure
Subaru weak-lensing bimodal structure
2011/9/26
We present a weak-lensing analysis of the merging cluster A2163 using Subaru/Suprime-Cam and CFHT/Mega-Cam data and discuss the dynamics of this cluster merger, based on complementary weak-lensing, X-...
美国宇航局称将公布天体生物学新发现
美国 宇航局 天体生物学 新发现
2010/12/2
据美国国家航空航天局(NASA)官网2010年11月29日发布的新闻稿，NASA将于当地时间12月2日下午2点(北京时间3日凌晨3点左右)在其华盛顿总部演播大厅召开新闻发布会，内容将涉及NASA在天体生物学方面的一些新发现。
《科学》：土卫五首次发现稀薄大气含氧七成（图）
科学 土卫五 稀薄大气 含氧七成
2010/11/29
美国研究人员发现，土星第二大卫星土卫五上存在稀薄大气，其中氧气含量占大约70%，二氧化碳占30%。这是研究人员首次在土星的卫星上发现富含氧气的大气。上述研究结果2010年11月25日由美国《科学》杂志网站发布。
哈勃拍到“星光”缓慢吞噬蓝色气体灰尘云（图）
哈勃 星光 蓝色气体 灰尘云
2010/11/15
据国外媒体报道，日前，美国宇航局哈勃太空望远镜拍摄到一张壮观的照片——星光正在缓慢地摧毁漫游的气体灰尘云。
研究认为火星大峡谷形成或与水有关（图）
火星大峡谷 与水有关
2010/11/11
地质学家认为，水手谷大约在35亿年前沿地质断层开始形成。断层是由地质构造变化以及位于西部的塔希斯（Tharsis）巨型火山的不断增长所造成的。当熔化的岩浆从地壳涌入塔希斯山后，整个地区开始抬升，这时周边的地壳岩石不断被拉伸，直至断裂形成断层和裂纹。当裂缝展开后，地面就会下沉。同时，断层也为地下水的流动打开了通道，它破坏了地表，并且扩大了断裂区域。在水手谷的无数地方，险峻而且较新暴露的崖壁变得很不牢...