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EXTRAPLANAR IONIZED-GAS AND KINEMATICS IN THE EDGE-ON GALAXY NGC-891

被引：50
作者：
KEPPEL, JW
DETTMAR, RJ
GALLAGHER, JS
ROBERTS, MS
机构：
[1] NATL OPT ASTRON OBSERV,TUCSON,AZ 85726
[2] SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218
[3] NATL RADIO ASTRON OBSERV,CHARLOTTESVILLE,VA 22903
[4] UNIV BONN,INST RADIOASTRON,W-5300 BONN 1,GERMANY
[5] LOWELL OBSERV,FLAGSTAFF,AZ 86002
来源：
ASTROPHYSICAL JOURNAL | 1991年 / 374卷 / 02期
关键词：
GALAXIES; INDIVIDUAL; (NGC-891); INTERNAL MOTIONS; STRUCTURE;
D O I：
10.1086/170139
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Spectroscopic observations of the edge-on spiral galaxy NGC 891 confirm the existence of ionized gas well above its central plane. H-alpha can be traced to z > 30" corresponding to z > 1.4 kpc. Alternative situations - an incorrect aspect ratio, a warp in the plane, or scattering from extraplanar dust - are considered and rejected. Eleven spectrograms positioned parallel and perpendicular to the plane show that this gas is in cylindrical rotation to at least z = 0.7 kpc, to within the accuracy of measurement, 25 km s-1. Corotation is most readily understood if this high-z gas originates within the disk. The structure and physical state of this extraplanar ionized gas are discussed.
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页码：507 / &
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