NGC3079原子核中中性氢的吸收

Vistas in Astronomy Pub Date : 1996-01-01 DOI:10.1016/0083-6656(95)00108-5

A. Pedlar , C.G. Mundell , J.F. Gallimore , S.A. Baum , C.P. O'Dea

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引用次数: 9

摘要

我们用亚弧秒MERLIN 21cm中性氢吸收谱线测量了与Sc星系NGC3079活动核相关的一个4 × 3弧秒(300 × 200pc)区域。宽吸收(200-400 km s - 1)和深吸收(τ ~ 0.5-1)覆盖了该区域的大部分区域，对应于高达3 × 1022原子cm - 2的柱密度。吸收显示出速度梯度，这可能与围绕中心质量(~ 109 M⊙)的旋转一致，但是也存在显著的非圆运动，这可能是由于气体在非轴对称势中的运动。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Neutral hydrogen absorption in the nucleus of NGC3079

We present subarcsecond MERLIN 21cm neutral hydrogen absorption line measurements of a 4 × 3 arcseconds (300 × 200 pc) region associated with the active nucleus of the Sc galaxy NGC3079. Broad (200–400 km s⁻¹) and deep (τ ∼ 0.5–1) absorption is seen over much of the region, corresponding to column densities as high as 3 × 10²² atoms cm⁻². The absorption shows a velocity gradient which could be consistent with rotation about a central mass of ∼ 10⁹ M_⊙, however significant non-circular motions are also present which may be due to gas motions in a non-axisymetric potential.

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