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.

引用

页码：507 / &

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