An Hα survey aiming at the detection of extraplanar diffuse ionized gas in halos of edge-on spiral galaxies I. How common are gaseous halos among non-starburst galaxies?
An Hα survey aiming at the detection of extraplanar diffuse ionized gas in halos of edge-on spiral galaxies I. How common are gaseous halos among non-starburst galaxies?
复制标题
旨在探测边缘螺旋星系晕中面外扩散电离气体的 Hα 巡天 I. 非星暴星系中气态晕有多常见？
DOI：
10.1051/0004-6361:20030615
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发表时间：
2003
影响因子：
6.5
通讯作者：
Stsci
中科院分区：
文献类型：
--
作者：
J. Rossa;Ralf;Stsci
在一系列的两篇论文中，我们介绍了一个新的Hα成像调查的结果，旨在检测晚型旋涡星系晕中的面外弥漫电离气体。我们已经调查了74个邻近的边缘上的螺旋样本，覆盖了北方和南半球。在30个星系中，我们探测到平均距离为|z| 101 −2千秒差距。单根细丝可以追溯到|z|在少数情况下≤ 6 kpc。我们发现一个很好的相关性之间的FIR通量比（S60/S100）和每单位面积的SFR（LFIR/D2），基于检测/未检测。这实际上对星暴、正常和静止星系都有效。在最低的S60/S100值下，导出了单位面积的最小SFR，即uEthres =（3.2 ± 0.5）× 1040 erg s −1 kpc −2。有星系的面外发射被检测到在较小的LFIR/D 2值，但是，只有在结合显着增强的尘埃温度。结果证实了一般的观点，即气体晕是一个直接的后果SF活动在下面的星系盘。
In a series of two papers we present results of a new Hα imaging survey, aiming at the detection of extraplanar diffuse ionized gas in halos of late-type spiral galaxies. We have investigated a sample of 74 nearby edge-on spirals, covering the northern and southern hemisphere. In 30 galaxies we detected extraplanar diffuse emission at mean distances of |z |∼ 1−2 kpc. Individual filaments can be traced out to |z |≤ 6 kpc in a few cases. We find a good correlation between the FIR flux ratio (S 60/S 100) and the SFR per unit area (LFIR/D 2), based on the detections/non-detections. This is actually valid for starburst, normal and for quiescent galaxies. A minimal SFR per unit area for the lowest S 60/S 100 values, at which extended emission has been detected, was derived, which amounts to u E thres = (3.2 ± 0.5) × 10 40 erg s −1 kpc −2 . There are galaxies where extraplanar emission was detected at smaller values of LFIR/D 2 , however, only in combination with a significantly enhanced dust temperature. The results corroborate the general view that the gaseous halos are a direct consequence of SF activity in the underlying galactic disk.