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arXiv 1003.2903astro-ph.CO
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星暴/LINER星系NGC1614中央kpc的恒星形成

Star-formation in the central kpc of the starburst/LINER galaxy NGC1614

E. Olsson, S. Aalto, M. Thomasson, R. Beswick

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Accepted by Astronomy and Astrophysics, 12 pages, 10 figures
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摘要：

对LINER星系NGC 1614进行了高角分辨率、多波长的研究。OVRO CO 1-0观测与VLA和MERLIN的广泛的多频无线电连续谱和HI吸收观测一起提出。在NGC 1614的中心，我们探测到一个半径为300 pc的射电连续辐射环。这个环与以前的射电和帕邢-阿尔法观测结果一致。根据HI吸收，环的动力学质量为3.1 x 10 E9 Msun。CO 1-0排放的峰值向环中心的西北方向移动了1”，其中很大一部分CO排放与穿越尘埃带有关。环区的分子气体质量上限为1.7 x 10 E9 Msun。在环内，有一个从北向南延伸的1.4GHz无线电连续特征，并有一个核峰。这个峰值也被认为是在5GHz的无线电连续和CO。我们建议，R=300 pc的恒星形成环代表的半径的动态共振-作为替代方案，星爆是从中心向外传播到一个分子环。环状外观可能是螺旋结构的一部分。大量的分子气体已经通过了环的半径并到达了核区域。在5GHz无线电连续谱和CO中看到的核峰值可能与之前的恒星形成有关，其中所有分子气体都没有消耗。在NGC 1614中观察到的类似LINER的光谱可能是由于核星暴活动造成的，而不是由于活动星系核（AGN）造成的。尽管不能排除活动星系核的存在。

英文摘要：

A high angular resolution, multi-wavelength study of the LINER galaxy NGC1614 has been carried out. OVRO CO 1-0 observations are presented together with extensive multi-frequency radio continuum and HI absorption observations with the VLA and MERLIN. Toward the center of NGC1614, we have detected a ring of radio continuum emission with a radius of 300 pc. This ring is coincident with previous radio and Paschen-alpha observations. The dynamical mass of the ring based on HI absorption is 3.1 x 10E9 Msun. The peak of the integrated CO 1-0 emission is shifted by 1" to the north-west of the ring center and a significant fraction of the CO emission is associated with a crossing dust lane. An upper limit to the molecular gas mass in the ring region is 1.7 x 10E9 Msun. Inside the ring, there is a north to south elongated 1.4GHz radio continuum feature with a nuclear peak. This peak is also seen in the 5GHz radio continuum and in the CO. We suggest that the R=300 pc star forming ring represents the radius of a dynamical resonance - as an alternative to the scenario that the starburst is propagating outwards from the center into a molecular ring. The ring-like appearance probably part of a spiral structure. Substantial amounts of molecular gas have passed the radius of the ring and reached the nuclear region. The nuclear peak seen in 5GHz radio continuum and CO is likely related to previous star formation, where all molecular gas was not consumed. The LINER-like optical spectrum observed in NGC1614 may be due to nuclear starburst activity, and not to an Active Galactic Nucleus (AGN). Although the presence of an AGN cannot be excluded.

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