搜索结果: 1-15 共查到“等离子体天体物理学 formation”相关记录19条 . 查询时间(0.156 秒)
Accretion-regulated star formation in late-type galaxies
Accretion-regulated star late-type galaxies
2010/11/15
We develop a four-phase galaxy evolution model in order to study the effect of accretion of extra-galactic gas on the star formation rate (SFR) of a galaxy. Pure self-regulated star formation of isola...
Impact of Primordial Ultracompact Minihaloes on the Intergalactic Medium and First Structure Formation
intergalactic medium dark matter cosmology theory early Universe galaxies structure
2010/11/12
The effects of dark matter annihilation on the evolution of intergalactic medium(IGM) in the early Universe can be more important if dark matter structure is more concentrated. Ultracompact Minihaloes...
Fuel Efficient Galaxies: Sustaining Star Formation with Stellar Mass Loss
cosmology theory – galaxies evolution – galaxies formation – stars formation – methods
2010/11/11
We examine the importance of secular stellar mass loss for fueling ongoing star formation in disk galaxies during the late stages of their evolution. For a galaxy of a given stellar mass, we calculate...
The Cluster Birthline and the formation of stellar clusters in M33
Cluster Birthline stellar clusters
2010/11/10
We present a new method to analyze the IMF at its high mass end in young stellar clusters, which rely on two integrated observables: the cluster bolometric and H luminosity.Using several cluster samp...
Magnetic Diffusion in Star Formation
MHD turbulence waves stars formation ISM clouds ISM magnetic fields
2010/11/10
Magnetic diffusion plays a vital role in star formation. We trace its influence from interstellar cloud scales down to star-disk scales. On both scales, we find that magnetic diffusion can be signific...
Interstellar Turbulence and Star Formation
structure ISM clouds ISM magnetic fields turbulence methods numerical
2010/11/12
We provide a brief overview of recent advances and outstanding issues in simulations of interstellar turbulence, including isothermal models for interior structure of molecular clouds
and larger-scal...
Formation of Early Water Oceans on Rocky Planets
ocean magma ocean water planet atmosphere
2010/11/15
Terrestrial planets, with silicate mantles and metallic cores, are likely to obtain water and
carbon compounds during accretion. Here I examine the conditions that allow early formation of a surface ...
Star formation: statistical measure of the correlation between the prestellar core mass function and the stellar initial mass function
stars formation — stars luminosity function mass function — ISM clouds
2010/11/11
We present a simple statistical analysis of recent numerical simulations exploring the correlation between the core mass function obtained from the fragmentation of a molecular cloud and the stellar m...
High-resolution spectroscopic view of planet formation sites
planetary systems protoplanetary disks hydrodynamics line pro les
2010/11/15
Theories of planet formation predict the birth of giant planets in the inner, dense, and
gas-rich regions of the circumstellar disks around young stars. These are the regions from which strong CO emi...
New Panoramic View of $^{12}$CO and 1.1 mm Continuum Emission in the Orion A Molecular Cloud. I. Survey Overview and Possible External Triggers of Star Formation
Galaxy Astrophysics (astro-ph.GA)
2011/1/6
We present new, wide and deep images in the 1.1 mm continuum and the $^{12}$CO ($J$=1-0) emission toward the northern part of the Orion A Giant Molecular Cloud (Orion-A GMC). The 1.1 mm data were take...
Active Disk Building in a local HI-Massive LIRG: The Synergy between Gas, Dust, and Star Formation
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/7
HIZOA J0836-43 is the most HI-massive (M_HI = 7.5x10^10 Msun) galaxy detected in the HIPASS volume and lies optically hidden behind the Milky Way. Markedly different from other extreme HI disks in the...
Formation Efficiencies of Old Globular Clusters - from Dwarf to Giant Galaxies
Cosmology and Extragalactic Astrophysics (astro-ph.CO) Galaxy Astrophysics (astro-ph.GA)
2011/1/6
For the full galaxy mass range, we find that previously observed trends of globular cluster (GC) system scaling parameters (number, luminosity or mass of all GCs in a galaxy normalized to the host gal...
Enhanced Core Formation Rate in a Turbulent Cloud by Self-gravity
Galaxy Astrophysics (astro-ph.GA)
2011/1/5
We performed a numerical experiment designed for core formation in a self-gravitating, magnetically supercritical, supersonically turbulent, isothermal cloud. A density probability distribution functi...
Averting the magnetic braking catastrophe on small scales: disk formation due to Ohmic dissipation
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/29
We perform axisymmetric resistive MHD calculations that demonstrate that centrifugal disks can indeed form around Class 0 objects despite magnetic braking. We follow the evolution of a prestellar core...
Photochemistry in the inner layers of clumpy circumstellar envelopes: formation of water in C-rich objects and of C-bearing molecules in O-rich objects
Galaxy Astrophysics (astro-ph.GA)
2010/12/28
A mechanism based on the penetration of interstellar ultraviolet photons into the inner layers of clumpy circumstellar envelopes around AGB stars is proposed to explain the non-equilibrium chemistry o...