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首页> 外文期刊>The Astrophysical journal >AN EXTENDED MOLECULAR GAS DISTRIBUTION IN MARKARIAN 273 AND MERGER-LUMINOSITY EVOLUTION
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AN EXTENDED MOLECULAR GAS DISTRIBUTION IN MARKARIAN 273 AND MERGER-LUMINOSITY EVOLUTION

机译：MARKARIAN 273中的扩展分子气体分布和并发发光度演化

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摘要

We present the first interferometric measurement of CO emission (θ ～ 2″) from the ultraluminous infrared galaxy Mrk 273. A total H_2 mass of 3.6 X 10~(10) solar mass is inferred from the CO observations, half of which belongs to an extended component with deconvolved size 5.1 X 2.5 kpc. In addition, an unresolved molecular gas complex is found to be coincident with the optical nucleus. The inferred H_2 mass, size (R ～ 380 pc), and mean surface mass density (∑_(H_2) ≥ 4 X 10~4 solar mass pc~(-3)) of this complex, as well as the IR luminosity, are very similar to those of Arp 220. The gas in the extended component shows a rotational velocity gradient with the kinematic major axis aligned with the position angle of the two nuclei seen in the near-infrared. The extended molecular gas distribution and separation of the two nuclei suggest that Mrk 273 is a young merger system. The CO emission appears confined to the edge-on system, and the second merger progenitor may have been gas-poor or may have had its gas transferred to the companion during the merger. The comparison of the physical properties of Mrk 273 with two other similarly gas-rich IR luminous systems, VV 114 and Arp 220, finds a monotonic increase in average gas surface density and IR luminosity efficiency (L_(IR)/M_(H_2)) with decreasing projected separation of the stellar nuclei. We find that now all four nearest ultraluminous systems observed at high spatial resolution (Arp 220, Arp 299, Mrk 231, and Mrk 273) are associated with central mass surface density in excess of 10~4 solar mas pc~(-2).
机译：我们提出了来自超发光红外星系Mrk 273的CO辐射的首次干涉测量（θ〜2“）。从CO观测值推断出H_2总质量为3.6 X 10〜（10）太阳质量，其中一半属于解卷积大小为5.1 X 2.5 kpc的扩展组件。另外，发现未解析的分子气体络合物与光核重合。推算出该配合物的H_2质量，大小（R〜380 pc）和平均表面质量密度（∑_（H_2）≥4 X 10〜4太阳质量pc〜（-3））以及红外发光度，与Arp 220的气体非常相似。扩展分量中的气体显示出旋转速度梯度，其运动主轴与在近红外中看到的两个原子核的位置角对齐。扩展的分子气体分布和两个原子核的分离表明Mrk 273是一个年轻的合并系统。 CO的排放似乎仅限于边缘系统，并且第二个合并祖先可能是汽油不足或在合并过程中将其气体转移到了同伴。将Mrk 273与其他两个类似的富含气体的IR发光系统VV 114和Arp 220的物理性质进行比较，发现平均气体表面密度和IR发光效率（L_（IR）/ M_（H_2））单调增加。随着星状核预计分离的减少。我们发现，现在在高空间分辨率下观察到的所有四个最接近的超发光系统（Arp 220，Arp 299，Mrk 231和Mrk 273）都与中心质量表面密度超过10〜4个太阳质量pc〜（-2）有关。

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