HIGH-VELOCITY GAS DRIZZLE INTO THE DISK OF NGC-4258

被引：25

作者：

RUBIN, VC

GRAHAM, JA

机构：

[1] Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, 5241 Broad Branch Road, NW

来源：

ASTROPHYSICAL JOURNAL | 1990年 / 362卷 / 01期

关键词：

Galaxies: individual (NGC 4258); Galaxies: internal motions; Galaxies: jets;

D O I：

10.1086/185834

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Spectra in three position angles in NGC 4258 reveal a complex pattern of ionized gas velocities. Along the major axis the spectrum has a feathery appearance, with multiple velocity structures at many radii. At 25° to the major axis, on the approaching far side, gas velocities span the range from the disk rotation velocity to 300 km s-1 more positive. It is likely that we are observing high-velocity gas drizzling to the plane. On the near side we observe (r = 73″, θ = 305°) a galactic chimney, with gas velocities ranging from + 250 km s-1 to -250 km s-1 with respect to the disk velocity. Our spectral coverage is incomplete and cannot constrain a model, but we relate the observed features to the known jets and anomalous arms in NGC 4258.

引用

页码：L5 / &

共 18 条

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