搜索结果: 1-9 共查到“天文学 thick”相关记录9条 . 查询时间(0.078 秒)
On the Lx-L6micron ratio as a diagnostic for Compton-thick AGN
X-rays: general X-rays: di use background X-rays: galaxies Infrared: galaxies
2011/10/11
As the mid-IR luminosity represents a good isotropic proxy of the AGN power, a low X-ray to mid-IR luminosity ratio is often claimed to be a reliable indicator for selecting Compton-thick (CT) AGN. We...
Effect of Dust on Lyman-alpha Photon Transfer in Optically Thick Halo
Effect Photon Transfe Optically Thick
2011/9/30
We investigate the effects of dust on Ly{\alpha} photons emergent from an optically thick medium by solving the integro-differential equation of the radiative transfer of resonant photons. To solve th...
The energy budget for X-ray to infrared reprocessing in Compton-thin and Compton-thick active galaxies
The energy budget X-ray Compton-thin
2011/1/13
Heavily obscured active galactic nuclei (AGNs) play an important role in contributing to the cosmic X-ray background (CXRB). However, the AGNs found in deep X-ray surveys are often too weak to allow d...
The kinematic identification of a thick stellar disc in M31
The kinematic identification stellar disc
2011/1/11
Submitted on 25 Oct 2010 (v1), last revised 21 Dec 2010 (this version, v2))
Abstract: We present the first characterization of a thick disc component in the Andromeda galaxy (M31) using kinematic dat...
Suzaku and SWIFT-BAT observations of a newly discovered Compton-thick AGN
Cosmology and Extragalactic Astrophysics (astro-ph.CO) High Energy Astrophysical Phenomena (astro-ph.HE)
2010/12/28
Obscured AGN are fundamental to understand the history of Super Massive Black Hole growth and their influence on galaxy formation. However, the Compton-thick AGN (NH>1e24 cm^-2) population is basicall...
Evidence of a thick disk rotation-metallicity correlation
thick disk rotation-metallicity correlation galactic disks
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...
The Partition Between Terminal Speed and Mass Loss：Thin, Thick, and Rotating Line-Driven Winds
Terminal Speed Rotating Line-Driven Winds Mass Loss
2009/6/16
The Partition Between Terminal Speed and Mass Loss：Thin, Thick, and Rotating Line-Driven Winds。
Optically thick giant H II regions with decreasing density gradients in three barred galaxies
H II regions three barred galaxies density gradients
2009/6/11
Optically thick giant H II regions with decreasing density gradients in three barred galaxies。
Some theoretical consequences of the thick, magnetized galactic disk。