ANOMALOUS KINEMATICS AND THE IONIZATION OF THE H-ALPHA ARM IN NGC-4258

被引：0
作者：
DETTMAR, RJ [1 ]
KORIBALSKI, B [1 ]
机构：
[1] MAX PLANCK INST RADIOASTRON, W-5300 BONN 1, GERMANY
来源：
ASTRONOMY & ASTROPHYSICS | 1990年 / 240卷 / 02期
关键词：
GALAXIES; INDIVIDUAL NGC-4258; ACTIVE; JETS OF; NUCLEI OF;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the detection of an high-velocity component of the diffuse ionized gas in the anomalous H-alpha-arm of NGC 4258 from new long-slit spectra in the H-alpha-regime. This gas component deviates by up to 250 km s-1 from the undisturbed velocity field. The nuclear emission lines are found to be asymmetric in the NW-SE direction. The emission lines in the "jet"-like structure are broad, with FWHM up to 350 km s-1, and the ionization within this structure changes to lower excitation with increasing distance from the nucleus.
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页码：L15 / L18
页数：4
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