Anisotropic ionizing radiation in Seyfert galaxies. I - The extended narrow-line region in Markarian 573
Anisotropic ionizing radiation in Seyfert galaxies. I - The extended narrow-line region in Markarian 573
复制标题
塞弗特星系中的各向异性电离辐射。
DOI：
10.1086/171034
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
J. Walsh
中科院分区：
文献类型：
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作者：
Z. Tsvetanov;J. Walsh
利用长缝光谱网格的窄带图像研究了Seyfert 2星系Mrk 573的核扩展窄线区（ENLR）的形态、运动学和电离状态。对整个ENLR进行了光谱映射，并对速度结构进行了研究。速度场图显示了带有一些重要偏差的典型星系旋转图。采用一个简单的几何模型，按照“统一格式”，研究了观测图像的各种参数的影响。最佳匹配是当双锥辐射场照亮宿主星系的ISM时，宿主星系参与正常的星系旋转，但也有靠近核的径向运动。发射在线图像显示，ENLR在西北-东南方向沿射电轴延伸，但通量比禁止O III 5007/（H-alpha +禁止N II）的图显示出不同的结构，最高激发峰沿射电轴向东南偏移约4弧秒。
The morphology, kinematics, and ionization state of the nuclear extended narrow-line region (ENLR) of the Seyfert 2 galaxy Mrk 573 are studied using narrow-band images of a grid of long-slit spectra. The entire ENLR is mapped spectroscopically, and velocity structure is studied. The velocity field map shows a typical galactic rotation picture with some important deviations. A simple geometric model, in accordance with the 'unified schemes', is employed to study the effects of various parameters of the observed picture. The best match is achieved when a biconical radiation field illuminates the ISM of the host galaxy that takes part in a normal galaxy rotation but also has radial motions close to the nucleus. The emission-line images reveal an ENLR elongated along the radio axis in the northwest-southeast direction, but a map of the flux ratio forbidden O III 5007/(H-alpha + forbidden N II) shows a different structure, with the highest excitation peak offset by about 4 arcsec along the radio axis to the southeast.