搜索结果: 1-14 共查到“知识库 天体演化学”相关记录14条 . 查询时间(2.734 秒)
【前沿论坛】惠鹤九：月球的形成和早期演化（图）
惠鹤九 月球 形成 早期演化
2023/1/14
摘要：对于月球的形成和早期演化，目前被普遍接受的是大撞击成因假说和岩浆洋假说。这些观点认为，在太阳系演化的早期，一个火星大小的星球（Theia）与原始地球发生撞击，造成二者的熔融，溅射出来的物质经过约100年左右的时间吸积形成月球。月球形成初期具有全球规模的岩浆洋，之后岩浆洋结晶分异，橄榄石、辉石等矿物先结晶，堆积在岩浆洋底部，形成原始月幔；而后低密度的钙长石结晶上浮，形成原始斜长岩月壳；后期高密...
The dynamics of satellite and dark matter halo interactions on galaxy formation and evolution
Satellite Dark matter halos. Dynamic Galaxy formation. The evolution of
2014/12/9
In my thesis, I research four consequences of satellite and dark matter halo interaction on galaxy formation. ^ First, I investigate detailed physical processes in interaction between satellites and d...
Galaxy evolution at high-redshift: Millimeter-wavelength surveys with the AzTEC camera
Pure sciences Dust Galaxy evolution Galaxies Star formation Submillimeter
2014/12/9
Galaxies detected by their thermal dust emission at submillimeter (submm) and millimeter (mm) wavelengths comprise a population of massive, intensely star-forming systems in the early Universe. These ...
The Role Of Stellar Feedback In Galaxy Evolution
Pure sciences Galaxies X-ray Stellar feedback Galaxy evolution
2014/12/9
Aiming at understanding the role of stellar feedback in galaxy evolution, I present a study of the hot interstellar medium in several representative galaxies, based primarily on X-ray observations as ...
星球物质层次包压论认为，黑洞不是恒星燃料耗尽冷却后自身的引力坍缩而成，而是热星云团中高速旋转的气体物质因离心力的作用向四周扩张膨胀旋转运动，云团被旋转挤压成亮度高的云环盘并在中间形成星云稀少、光线相对黑暗的空洞，称之为黑洞。黑洞的存在不具有普遍性，只是极个别热星云演变生成新星球过程的特殊形式。
"Revealing a Population of Heavily Obscured Active Galactic Nuclei at z=0.5-1 in the Chandra Deep Field-South
Revealing Population Heavily Obscured Active Galactic Nuclei
2011/10/10
We identify a numerically significant population of heavily obscured AGNs at z~0.5-1 in the Chandra Deep Field-South (CDF-S) and Extended Chandra Deep Field-South by selecting 242 X-ray undetected obj...
Photometric SN Ia Candidates from the Three-Year SDSS-II SN Survey Data
Photometric Candidates Three-Year SDSS-II SN Survey Data
2011/10/21
We analyze the three-year SDSS-II Superernova (SN) Survey data and identify a sample of 1070 photometric SN Ia candidates based on their multi-band light curve data. This sample consists of SN candida...
Formation and Evolution of the Dust in Galaxies. III. The Disk of the Milky Way
Galaxies - Dust Galaxies – Spirals Galaxies – Milky Way
2011/10/13
Models of chemical evolution of galaxies including the dust are nowadays required to decipher the high-z universe. In a series of three papers we have tackled the problem and set a modern chemical evo...
The Solar Neighborhood XXVII: Discovery of New Proper Motion Stars with mu > 0.18 "/yr in the Southern Sky with 16.5 > R_59F > 18.0
Solar Neighborhood Discovery Proper Motion Stars Southern Sky
2011/10/13
Here we present 1584 new southern proper motion systems with mu > 0.18 "/yr and 16.5 > R_59F > 18.0. This search complements the six previous SuperCOSMOS-RECONS (SCR) proper motion searches of the sou...
An AMR Study of the Common Envelope Phase of Binary Evolution
AMR Study Common Envelope Phase Binary Evolution
2011/10/12
The hydrodynamic evolution of the common envelope phase of a low mass binary composed of a 1.05 Msun red giant and a 0.6 Msun companion has been followed for five orbits of the system using a high res...
Modeling blue stragglers in young clusters
stars: blue stragglers— stars: binaries: close
2011/10/12
In this paper, a grid of the binary evolution models are calculated for the study of blue straggler (BS) population in intermediate age ($\log Age$=7.85-8.95) star clusters. The BS formation via mass ...
Delta Scorpii 2011 periastron: worldwide observational campaign and preliminary photometric analysis
Delta Scorpii Diff erential Photometry
2011/9/28
Delta Scorpii is a double giant Be star in the forefront of the Scorpio, well visible to the naked eye, being normally of magnitude 2.3. In the year 2000 its luminosity rose up suddenly to the magnitu...
Radio Properties of Rotating Radio Transients I: searches for periodicities and randomness in pulse arrival times
stars:neutron – pulsars: general – Galaxy: stellar content
2011/9/28
We have analysed the long- and short-term time dependence of the pulse arrival times and the pulse detection rates for eight Rotating Radio Transient (RRAT) sources from the Parkes Multi-beam Pulsar S...
Report on the Dynamical Evolution of an Axially Symmetric Quasar Model
Galaxies: orbits regular and chaotic motion
2010/9/16
The role of the angular momentum in the regular or chaotic character of motion in an axially symmetric quasar model is examined.It is found that, for a given value of the critical angular momentum Lzc...