The Sérsic-Pastoriza galaxy NGC 1808 - 1 . Radio-continuum, optical and H I observations
The Sérsic-Pastoriza galaxy NGC 1808 - 1 . Radio-continuum, optical and H I observations
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Sérsic-Pastoriza 星系 NGC 1808 - 1 射电连续谱、光学和 H I 观测。
DOI：
10.1093/mnras/245.3.397
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发表时间：
1990
影响因子：
4.8
通讯作者：
K. Gyldenkerne
中科院分区：
文献类型：
--
作者：
D. Saikia;S. W. Unger;A. Pedlar;G. J. Yates;D. Axon;R. Wolstencroft;K. Taylor;K. Gyldenkerne
我们展示了使用 VIA 在 Sersic-Pastoriza 星系 NGC 1808 中心区域 20、6 和 2 厘米处以高角分辨率进行的射电连续观测。这些观测揭示了一群紧凑的射电源，让人想起在原型星暴星系 M82 和 NGC 253 中发现的那些。这些紧凑特征的大部分与光学热点并不重合，很可能是单独的或单独的。未解决的 SNR 组。我们还使用 VLA（超大型阵列）对 NGC 1808 进行了 Hi 观测。虽然这主要是为了寻找可能使我们了解核活动的异常运动，但我们还获得了有关该系统中气体的大规模分布和动力学的信息。中性氢主要集中在中心棒中，从旋臂中发射出微弱的氢。针对核区域射电发射的吸收曲线显示了跨越系统速度的两个特征。尽管有证据表明条中存在显着的非圆形运动，但星系的速度场在很大程度上与旋转一致。我们讨论这些非圆周运动与 NGC 1808 中心区域的星暴/核活动之间的任何可能关系。
We present radio-continuum observations made at high angular resolution with the VIA at 20, 6 and 2 cm of the central region of the Sersic-Pastoriza galaxy NGC 1808. These observations reveal a population of compact radio sources, reminiscent of those found in the archetypal starburst galaxies M82 and NGC 253. The bulk of these compact features are not coincident with the optical hot-spots and are likely to be individual or unresolved groups of SNRs. We have also made H i observations of NGC 1808 with the VLA (very large array). Although this was primarily to search for unusual motions which may enable us to understand the nuclear activity, we also obtained information on the large-scale distribution and dynamics of gas in this system. The neutral hydrogen is largely concentrated in a central bar, with weak emission from the spiral arms. An absorption profile against the radio emission from the nuclear region shows two features straddling the systemic velocity. The velocity field of the galaxy is largely consistent with rotation although there is evidence of significant non-circular motions in the bar. We discuss any possible relationship between these non-circular motions and the starburst/nuclear activity in the central region of NGC 1808.