obscuration

n.

昏暗，暗淡，朦胧；

Heavy obscuration in X-ray weak AGNs
Obscuration and the various kinds of Seyfert galaxies
Obscuration of quasars by dust in damped Lyman-alpha systems
X-ray obscuration and obscured AGN in the local universe
Energy Recovery of Secondary Obscuration
The obscuration by dust of most of the growth of supermassive black holes.
Star formation and dust obscuration at z~2: galaxies at the dawn of downsizing
Early CT finding in cerebral infarction: obscuration of the lentiform nucleus
Mid-IR Galaxy Classification Based on Silicate Obscuration and PAH Equivalent Width
UV Continuum Slope and Dust Obscuration from z ~ 6 to z ~ 2: The Star Formation Rate Density at High Redshift