SMA observations of Haro 2: molecular gas around a hot superbubble

SMA observations of Haro 2: molecular gas around a hot superbubble
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Haro 2 的 SMA 观测:热超级气泡周围的分子气体

DOI:
10.1093/mnras/staa660
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发表时间:
2020
影响因子:
4.8
通讯作者:
Turner, Jean
Turner, Jean
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Beck, Sara C;Hsieh, Pei-Ying;Turner, Jean

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哈洛2是附近的一个矮星暴矮星系,具有强烈的Ly α发射,它的星暴产生了外流和细丝。星系外流的明确证据使其成为研究矮星系中分子气体在反馈过程中的作用的理想候选者。我们在亚毫米波阵上观测了哈洛2中的CO(2 - 1),并绘制了速度分辨率为4.1 km s-1、空间分辨率为2.0 × 1.6 arcsec 2的分子辐射图。与以前的测量相比,随着分辨率的显著增加,我们看到分子气体包括两个成分:与星爆的嵌入星星团相关的明亮团块,以及星爆区域以东较暗的扩展发射。扩展发射与X射线气泡重合,并具有流出锥体或膨胀壳或气泡的运动学特征;速度范围为35 km s-1。我们认为,产生X射线泡的星暴风夹带了分子气体,与测光轴成一定角度的表观速度梯度是外流造成的假象。分子和X射线活动在星系的东面,电离外流和光学细丝在西面,它们之间的关系尚不清楚。
Haro 2, a nearby dwarf starburst dwarf galaxy with strong Ly α emission, hosts a starburst that has created outflows and filaments. The clear evidence for galactic outflow makes it an ideal candidate for studying the role of molecular gas in feedback processes in a dwarf galaxy. We observed CO(2–1) in Haro 2 at the Submillimeter Array in the compact and extended configurations, and have mapped the molecular emission with velocity resolution 4.1 km s−1and spatial resolution 2.0 × 1.6 arcsec2. With this significant increase of resolution over previous measurements, we see that the molecular gas comprises two components: bright clumps associated with the embedded star clusters of the starburst, and fainter extended emission east of the starburst region. The extended emission coincides with an X-ray bubble and has the kinematic signatures of an outflowing cone or of an expanding shell or bubble; the velocity range is ∼35 km s−1. We suggest that the starburst winds that created the X-ray bubble have entrained the molecular gas, and that the apparent velocity gradient at an angle to the photometric axis is an artefact caused by the outflow. The molecular and X-ray activity is on the east of the galaxy and the ionized outflow and optical filaments are west; their relationship is not clear.
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