Hydrodynamical simulations of Galactic fountains – II. Evolution of multiple fountains     

C. Melioli  F. Brighenti  A. D'Ercole  E. M. de Gouveia Dal Pino 《Monthly notices of the Royal Astronomical Society》2009,399(3):1089-1105

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大气重力波触发的Rayleigh－Taylor不稳定性的时空演变     

黄朝松  李钧 《地球物理学报》1995,38(3):286-295

对大气重力波触发的赤道电离层Ｒａｙｌｅｉｇｈ－Ｔａｙｌｏｒ不稳定性的时空演变进行了数值模拟．结果表明，重力波能在Ｆ区底部触发Ｒａｙｌｅｉｇｈ－Ｔａｙｌｏｒ不稳定性，这种等离子体不稳定扰动穿过Ｆ峰，到达Ｆ区顶部，形成等离子体泡结构．等离子体泡出现向西倾斜和分岔等特征．当夜Ｆ区较高时，产生等离子体泡的时间仅１９００ｓ．数值模拟结果证实了重力波触发．Ｒａｙｌｅｉｇｈ－Ｔａｙｌｏｒ不稳定性的理论，解释了大量电离层观测现象．  相似文献   

Evolution of the X-ray luminosity and metallicity of starburst blown superbubbles     

Sergey A. Silich  †  Guillermo Tenorio-Tagle  ‡  Roberto Terlevich  §  Elena Terlevich †¶  Hagai Netzer 《Monthly notices of the Royal Astronomical Society》2001,324(1):191-200

We have modelled the evolution of hot superbubbles in starbursts, taking into account the rapid changes in the chemical composition of the interior of the superbubbles resulting from the large stellar mass loss, i.e. stellar winds from massive young stars and type II supernovae. We have followed in detail the time-dependent production and mixing of oxygen and iron in the interior of the hot superbubbles and showed that while the oxygen abundance rapidly climbs to over solar values in less than 10 Myr, iron abundance remains always under solar. This highly enhanced oxygen metallicity boosts the early X-ray luminosity of superbubbles while keeping the iron abundance subsolar. This brings theory and X-ray observations of the luminosity and metal content of young starbursts closer together.  相似文献   

Erratum: A census of the Carina Nebula – I. Cumulative energy input from massive stars     

《Monthly notices of the Royal Astronomical Society》2006,368(4):1983-1984

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Starburst-driven galactic winds – I. Energetics and intrinsic X-ray emission     

David K. Strickland †  Ian R. Stevens 《Monthly notices of the Royal Astronomical Society》2000,314(3):511-545

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Simulating cosmic reionization at large scales – I. The geometry of reionization     

I. T. Iliev  G. Mellema  U.-L. Pen  H. Merz  P. R. Shapiro  M. A. Alvarez 《Monthly notices of the Royal Astronomical Society》2006,369(4):1625-1638

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On the destruction of star-forming clouds     

Pierluigi Monaco 《Monthly notices of the Royal Astronomical Society》2004,354(1):151-160

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Extended Galactic emission at l=312°: a comparison of mid-infrared and radio continuum (843 MHz) images     

Martin Cohen  Anne J. Green 《Monthly notices of the Royal Astronomical Society》2001,325(2):531-544

We report on the comparison of images of a region of the Galactic plane (centred on l =312°) as seen by the Midcourse Space Experiment (MSX) at 8.3 μm and by the Molonglo Observatory Synthesis Telescope (MOST) at 843 MHz in the radio continuum. We note that the survey from each telescope is without peer and occupies a niche in panoramic coverage with high spatial resolution. Using independent classification of sources in the selected region, a detailed comparison of the two surveys was made. The aim of the project was to seek global characteristics for different types of source, with a view to establishing predictive criteria for identification and hence emission mechanisms. Several strong trends were found. There is a complete absence in this field of any detected MSX counterparts to non-thermal radio sources. Almost every H  ii region in the radio image has its MSX counterpart, in the form of a polycyclic aromatic hydrocarbon halo in the neutral zone surrounding the ionized gas. Both surveys show large-scale 'braided' filamentary structures, extending over 1°, which appear to be produced by thermal processes. These filaments may be structures in the warm ionized phase of the interstellar medium or extended haloes around H  ii regions. The comparisons in this paper were made using both preliminary MSX 8.3-μm results with 46-arcsec resolution and final MSX images with the intrinsic 20-arcsec resolution of the instruments.  相似文献   

A local void and the accelerating Universe   总被引：1，自引：0，他引：1  

K. Tomita 《Monthly notices of the Royal Astronomical Society》2001,326(1):287-292

RCW 114 is a filamentary nebula of about 250 arcmin diameter. Based on its large diameter-to-filament-width ratio, the expansion velocity, distance and size of the shell, it has been suggested that RCW 114 is a supernova remnant in its momentum-conserving phase. Confirmation of this identification is important, as the large angular size and extensive optical emission of this object will allow for detailed study to improve our knowledge of supernova remnants and their interaction with the interstellar medium.
We have used the FLAIR instrument on the UK Schmidt Telescope to obtain optical spectra of several filaments in RCW 114. These confirm that the emission is being produced by the interaction of the shock wave of a supernova remnant with the surrounding interstellar medium. We also obtained narrow-band H α +[N  ii ] and [S  ii ] images to examine the spatial variation in ionization structure.  相似文献   

Dynamical and pressure structures in winds with multiple embedded evaporating clumps – I. Two-dimensional numerical simulations     

J. M. Pittard  J. E. Dyson  S. A. E. G. Falle  T. W. Hartquist 《Monthly notices of the Royal Astronomical Society》2005,361(3):1077-1090

Because of its key role in feedback in star formation and galaxy formation, we examine the nature of the interaction of a flow with discrete sources of mass injection. We show the results of two-dimensional numerical simulations in which we explore a range of configurations for the mass sources and study the effects of their proximity on the downstream flow. The mass sources act effectively as a single source of mass injection if they are so close together that the ratio of their combined mass injection rate is comparable to or exceeds the mass flux of the incident flow into the volume that they occupy. The simulations are relevant to many diffuse sources, such as planetary nebulae and starburst superwinds, in which a global flow interacts with material evaporating or being ablated from the surface of globules of cool, dense gas.  相似文献