赛弗特星系

SAS-2的Υ辐射数据，已被用来测定类星体和赛弗特星系的Υ辐射绝对光度与光学绝对光度间的函数关系，并由此导出它们对河外Υ射线背景辐射的贡献。

The SAS-2 r-ray data have been employed to determine the functional relationships between the absolute y-ray luminosities Ly and the absolute optical luminosities of quasars and Seyfert galaxies . From these , their contribution to the extragalactic y-ray background have been derived .

二个新观测到的红外选赛弗特星系

Two New Infrared Selected Seyfert Galaxies

主角是位于天炉座的赛弗特星系NGC1097，它的小伙伴&矮椭圆星系NGC1097A，位于图像左上。

A comparatively tiny elliptical companion galaxy , NGC1097A , is also visible in the top left .

Ⅰ类赛弗特星系与低红移弱射电类星体哈勃图的比较

The comparison of Hubble diagrams between isy and QSOs with low redshifts and weak radio radiation

赛弗特星系中的分子环

Molecular Torns in Seyfert Galaxies

由此我们得出河外Υ射线背景辐射可能是由类星体和赛弗特星系这类活动星系产生的结论。

We conclude that the extragalactic r-ray background is likely to be generated by active galaxies such as quasars and Seyfert galaxies .

Markarian478是典型的窄线赛弗特I星系之一。

Markarian 478 ( Mrk 478 ) is one of the prototype narrow line Seyfert 1 galaxies .

窄线赛弗特Ⅰ型星系的快速光变观测研究

The observation research of rapid optical variability of narrow-line Seyfert 1s