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研究人类居住的太阳系附近的银河系环境、构成银河系生态系统的多种组份之间的相互作用、超新星爆发等星际活动对地球乃至人类演化的影响等等是天文学领域里的重要话题。这些都依赖于准确绘制银河系的三维物质分布。近日,国家天文台宇宙暗物质与暗能量研究团组提出一种利用超长波观测(在射电天文学领域,超长波或者超低频指频率在30MHz以下的电磁波)来构建银河系电子分布的新方法。这个方法无需对银河系的电子分布做任何先验...
银河系中的泡结构     银河系    壳层  恒星形成       2012/9/12
观测表明银河系内存在为数众多的星际泡,泡壁的二维投影亦称壳层,太阳系便位于称之为本地泡的一个泡结构之内。随着越来越多星际泡的发现和确认,人们对泡的研究渐趋深入,包括泡结构的多种统计性质,星际泡的若干可能的形成机制,以及泡与恒星形成和演化的关系等。从上述诸方面介绍了银河系泡结构的多波段研究进展。
A logarithmic spiral is a prominent feature appearing in a majority of observed galaxies. This feature has long been associated with the traditional Hubble classification scheme, but historical quotes...
I show that, in the context of MOND, non-isothermal models, approximated by high order polytropic spheres, are consistent with the observations of the radial distribution of the line-of-sight velocity...
We present a novel and flexible tensor approach to computing the effect of a time-dependent tidal field acting on a stellar system. The tidal forces are recovered from the tensor by polynomial interpo...
In order to understand which process (e.g. galactic winds, cold accretion) is responsible for the cool (T~10^4 K) halo gas around galaxies, we embarked on a program to study the star-formation propert...
Although the rapid neutron-capture process, or r-process, is fundamentally important for explaining the origin of approximately half of the stable nuclei with A > 60, the astrophysical site of this pr...
Encoded within the morphological structure of galaxies are clues related to their formation and evolutionary history. Recent advances pertaining to the statistics of galaxy morphology include sophisti...
The metallicity and dust-to-metals ratio of the Galaxy are fundamental parameters in understanding the ISM, but there is still uncertainty surrounding these parameters. In this paper, the dust-to-meta...
The problem of (non-)existence of a typical size of the stellar associations is revisited by use of deep UBVRI stellar CCD photometry in M 33 from the Local Group Survey (Massey et al. 2006). We compa...
Massive stellar content of stellar complexes and associations in M 33 is studied combining deep UBV photometry from the Local Group Survey (Massey et al. 2006) and JHK photometry from the 2MASS. Two b...
We report Hubble Space Telescope observations of 6 gravitational lenses with the Advanced Camera for Surveys. We measured the flux ratios between the lensed images in 6 filters from 8140\AA\ to 2200\A...
A new Monte Carlo method has been developed in order to derive ages of young embedded clusters within massive star forming regions where there is strong differential reddening. After foreground and in...
Ices regulate much of the chemistry during star formation and account for up to 80% of the available oxygen and carbon. In this paper, we use the Spitzer c2d ice survey, complimented with data sets on...
Gas-phase complex organic molecules are commonly detected toward high-mass protostellar hot cores. Detections toward low-mass protostars and outflows are comparatively rare, and a larger sample is key...

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