搜索结果: 76-90 共查到“天文学 Dust”相关记录114条 . 查询时间(0.015 秒)
Determining the forsterite abundance of the dust around AGB stars
forsterite abundance of the dust AGB stars
2010/11/11
We present a diagnostic tool to determine the forsterite abundance of the dust ejected by AGB stars. Our method is based on a comparison between the observed strength of spectral bands of forsterite a...
Origin of Molecular Outflow Determined from Thermal Dust Polarization
formation ISM jets and outflows magnetic fields polarization methods numerical
2010/11/9
The observational expectation of polarization measurements of thermal dust ra-diation is investigated to find information on molecular outflows based on magne-tohydrodynamical (MHD) and radiation tran...
The thesis deals with the first stage of planet formation, namely dust coagulation from
micron to millimeter sizes in circumstellar disks. For the first time, we collect and compile
the recent labor...
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...
Statistical study of dust properties in LMC molecular clouds
Galaxy Astrophysics (astro-ph.GA)
2011/1/5
The objective of this paper is to construct a catalog providing the dust properties and the star formation efficiency (SFE) of the molecular clouds in the Large Magellanic Cloud (LMC). We use the infr...
Dust in the diffuse emission of the galactic plane - The Herschel/Spitzer SED fitting
Galaxy Astrophysics (astro-ph.GA)
2011/1/4
The first Herschel Hi-Gal images of the galactic plane unveil the far-infrared diffuse emission of the interstellar medium with an unprecedented angular resolution and sensitivity. In this paper, we p...
The global dust SED: Tracing the nature and evolution of dust with DustEM
Galaxy Astrophysics (astro-ph.GA)
2011/1/4
The Planck and Herschel missions are currently measuring the farIR-mm emission of dust, which combined with existing IR data, will for the first time provide the full SED of the galactic ISM dust emis...
Dust-correlated centimetre-wave radiation from the M 78 reflection nebula
Galaxy Astrophysics (astro-ph.GA)
2010/12/29
An anomalous radio continuum component at cm-wavelengths has been observed in various sources, including dark clouds. This continuum component represents a new property of the ISM. In this work we foc...
WINGS-SPE II: A catalog of stellar ages and star formation histories, stellar masses and dust extinction values for local clusters galaxies
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/28
The WIde-field Nearby Galaxy clusters Survey (WINGS) is a project whose primary goal is to study the galaxy populations in clusters in the local universe (z<0.07) and of the influence of environment o...
Dust emission and star formation in Stephan's Quintet
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/27
We analyse a comprehensive set of MIR/FIR observations of Stephan's Quintet (SQ), taken with the Spitzer Space Observatory. Our study reveals the presence of a luminous (L_{IR}\approx 4.6x10^43 erg/s)...
Large Scale Traces of Solar System Cold Dust on CMB Anisotropies
Cosmology and Extragalactic Astrophysics (astro-ph.CO) Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/24
We explore the microwave anisotropies at large angular scales produced by the emission from cold and large dust grains, expected to exist in the outer parts of the Solar System, using a simple toy mod...
Forming Planetesimals by Gravitational Instability: II. How Dust Settles to its Marginally Stable State
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/23
Dust at the midplane of a circumstellar disk can become gravitationally unstable and fragment into planetesimals if the local dust-to-gas density ratio mu is sufficiently high. We simulate how dust se...
Relaxing the Small Particle Approximation for Dust-grain opacities in Carbon-star Wind Models
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/23
We have computed wind models with time-dependent dust formation and grain-size dependent opacities, where (1) the problem is simplified by assuming a fixed dust-grain size, and where (2) the radiation...
Three-Component Dust Models for Interstellar Extinction
Dust extinction—ISM abundances—ISM
2010/9/15
Interstellar extinction curves obtained from the ‘extinction without standard’ method were used to constrain the dust characteristics in the mean ISM (RV = 3.1), along the lines of sight through a hig...
On saturation of betatron acceleration of dust particles behind shock fronts
betatron acceleration dust particles shock fronts
2010/3/9
Possible saturation of betatron acceleration of dust particles behind strong shock fronts from supernovae is considered. It is argued that the efficiency of the nonthermal dust destruction should be s...