摘要
Markarian 478是典型的窄线赛弗特I星系之一。本文展示了在 2 0 0 1年 1月利用远紫外光谱探测卫星 (FUSE)观测到的Markarian 478的远紫外光谱。我们的光谱覆盖了 91 5Å ;— 1 1 85Å的波长范围 ,分辨率约为 2 0km/s。我们在连续谱上探测到OⅥλλ1 0 3 2 ,1 0 3 8、NⅢλ989和CⅢλ977强发射线。在高电离双线OⅥ以及Lyβ的蓝端线翼上出现了成协吸收线 ,而在NⅢ和CⅢ发射线上没有出现内禀吸收线。这些吸收线被分解成 5个动力学成分 ,它们相对于系统红移zem=0 .0 774的静止坐标系速度覆盖了从 -2 3 0 0～ 3
Markarian 478 (Mrk 478) is one of the prototype narrow line Seyfert 1 galaxies. We present far ultraviolet spectra of Mrk 478 obtained in 2001 January with the Far Ultraviolet Spectroscopic Explorer . Our data span the observed wavelength range 915-1185 with a resolution of ～ 20 km s -1 . The spectrum shows a blue continuum, and strong emission lines atOⅥλλ1032,1038, NⅢλ989, and CⅢλ977. Associated absorption lines are present on the blue wings of the high ionization emission doublet OⅥλλ1032,1038 and Lyβ, and no intrinsic absorption appears in NⅢ and CⅢ emission profiles. These intrinsic absorption features are resolved into five distinct kinematic components, covering rest frame velocities from-2300 to 370 km s -1 , with respect to the systemic redshift of z em =0.0774.
出处
《天文研究与技术》
CSCD
北大核心
2003年第S1期46-50,共5页
Astronomical Research & Technology
