搜索结果: 76-90 共查到“理学 disk”相关记录140条 . 查询时间(0.235 秒)
Unusually Luminous Giant Molecular Clouds in the Outer Disk of M33
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2011/1/4
We use high spatial resolution (~7pc) CARMA observations to derive detailed properties for 8 giant molecular clouds (GMCs) at a galactocentric radius corresponding to approximately two CO scale length...
Properties of Bulgeless Disk Galaxies: I. Atomic Gas
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2010/12/29
We study the neutral hydrogen properties of a sample of twenty bulgeless disk galaxies (Sd - Sdm Hubble types), an interesting class because their morphological simplicity implies that they have evolv...
Averting the magnetic braking catastrophe on small scales: disk formation due to Ohmic dissipation
Solar and Stellar Astrophysics (astro-ph.SR)
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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...
Kinematics of the Ammonia Disk around the Protostar NGC 1333 IRAS 4A2
Galaxy Astrophysics (astro-ph.GA)
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2010/12/28
The NGC 1333 IRAS 4A protobinary was observed in the ammonia (2, 2) and (3, 3) lines with an angular resolution of 0.3 arcsec. The ammonia emission source of IRAS 4A2 is elongated in the direction per...
Extremely large and hot multilayer Keplerian disk around the O-type protostar W51N: The precursors of the HCHII regions?
Galaxy Astrophysics (astro-ph.GA)
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2010/12/28
We present sensitive high angular resolution (0.57$''$-0.78$''$) SO, SO$_2$, CO, C$_2$H$_5$OH, HC$_3$N, and HCOCH$_2$OH line observations at millimeter and submillimeter wavelengths of the young O-typ...
Residence Times of Particles in Diffusive Protoplanetary Disk Environments I. Vertical Motions
Earth and Planetary Astrophysics (astro-ph.EP)
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2010/12/27
The chemical and physical evolution of primitive materials in protoplanetary disks are determined by the types of environments they are exposed to and their residence times within each environment.
An Inner Gaseous Disk around the Herbig Be Star MWC 147
Earth and Planetary Astrophysics (astro-ph.EP)
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2010/12/27
We present high-spectral-resolution, optical spectra of the Herbig Be star MWC 147, in which we spectrally resolve several emission lines, including the [O I] lines at 6300 and 6363\deg.
A Change of Rotation Profile in the Envelope in the HH 111 Protostellar System: A Transition to a Disk?
Galaxy Astrophysics (astro-ph.GA)
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2010/12/27
The HH 111 protostellar system consists of two Class I sources (VLA 1 and 2) with putative disks deeply embedded in a flattened envelope at a distance of 400 pc.
Detection of a Molecular Disk Orbiting the Nearby,
Solar and Stellar Astrophysics (astro-ph.SR)
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2010/12/24
We have used the Atacama Pathfinder Experiment 12 m telescope to detect circumstellar CO emission from MP Mus (K1 IVe), a nearby (D ~ 100 pc), actively accreting, ~7 Myr-old pre-main sequence (pre-MS)...
High star formation rates as the origin of turbulence in early and modern disk galaxies
Galaxy Astrophysics (astro-ph.GA) Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2010/12/27
High spatial and spectral resolution observations of star formation and kinematics in early galaxies have shown that two-thirds are massive rotating disk galaxies with the remainder being less massive...
Probing the accretion disk - jet connection via instabilities in the inner accretion flow. From microquasars to quasars
High Energy Astrophysical Phenomena (astro-ph.HE)
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2010/12/24
We present various instability mechanisms in the accreting black hole systems which might indicate at the connection between the accretion disk and jet. The jets observed in microquasars can have a pe...
The Structure of the β Leonis Debris Disk
Earth and Planetary Astrophysics (astro-ph.EP) Solar and Stellar Astrophysics (astro-ph.SR)
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2010/12/22
We combine nulling interferometry at 10 {\mu}m using the MMT and Keck Telescopes with spectroscopy, imaging, and photometry from 3 to 100 {\mu}m using Spitzer to study the debris disk around {\beta} L...
On quasiconformal selfmappings of the unit disk and elliptic PDE in the plane
Quasiconformal maps Beltrami equation Elliptic PDE Lipschitz condition
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2010/11/30
In this paper we prove the following theorem: if w is a quasiconformal mapping of the unit disk onto itself satisfying elliptic partial differential inequality |L[w]| ≤ B|∇w|2 + , then...
Boundary value problems for the stationary axisymmetric Einstein equations: a disk rotating around a black hole
Boundary value problems black hole axisymmetric Einstein equations
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2010/4/2
We solve a class of boundary value problems for the stationary axisymmetric Einstein equations corresponding to a disk of dust rotating uniformly around a central black hole. The solutions are given e...
Evidence of a thick disk rotation-metallicity correlation
thick disk rotation-metallicity correlation galactic disks
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2010/3/8
We analyze a new kinematic survey that includes accurate proper motions derived from SDSS DR7 positions, combined with multi-epoch measurements from the GSC-II database. By means of the SDSS spectro-p...