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arXiv 1903.04729astro-ph.GA
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OH超脉泽星系IRAS17526 +3253的双子座IFU、VLA和HST观测

Gemini IFU, VLA, and HST observation of the OH Megamaser Galaxy IRAS17526+3253

Dinalva A. Sales, A. Robinson, R. A. Riffel, T. Storchi-Bergmann, J. F. Gallimore, P. Kharb, S. Baum, C. O'Dea, C. Hekatelyne, F. Ferrari

摘要:

本文利用双子座多目标摄谱仪积分场单元(GMOS/IFU)观测数据、哈勃空间望远镜F814 W和H $α$ +[N{ \sc ii}]图像以及2 MASS和1.49GHz VLA数据,对OH超脉泽星系IRAS 17526 +3253进行了多波长研究。HST的影像清楚地显示了一个中期到晚期的合并,其西北和东南部的核心预计分离为$\sim$ 8.5kpc。我们的HST/H $α$ +[N{ \sc ii}]图像显示了在$\sim$ 10 kpc尺度上正在进行的恒星形成区域,这些区域与射电特征一致,支持射电辐射起源于恒星形成区域的解释。测量的H $α$光度值表明,恒星的形成速率为$\sim$ 10- 30 μ M $_{\odot}$ yr $^{-1}$ . GMOS/IFU数据揭示了西北部的两个结构,它们之间相隔850\,pc,并且$\sim$ ~200 km~s $^{-1}$速度场存在不连续性。我们关联的蓝移和红移组件,分别与西北和潮汐碎片,可能是一个尾巴起源于东南部的扭曲盘。恒星形成是两个组分的主要电离源,其SFR分别为$\sim$ 2.6- 7.9\,M $_{\odot}$ yr $^{-1}$和$\sim$ 1.5- 4.5\,M $_{\odot}$ yr $^{-1}$。与这些主要成分交界的较弱的谱线发射与速度为$\sim$ 200 km~s $^{-1}$的激波电离一致,可能是潮汐尾与西北星系盘相互作用的结果。IRAS 17526 +3253是少数几个同时拥有发光OH和H $_{2}$ O脉泽的系统之一。OH和H $_{2}$ O脉泽谱线的速度表明,它们分别与西北和东南星系有关。

英文摘要:

We present a multiwavelength study of the OH megamaser galaxy (OHMG) IRAS17526+3253, based on new Gemini Multi-Object Spectrograph Integral Field Unit (GMOS/IFU) observations, Hubble Space Telescope F814W and H$α$+[N{\sc ii}] images, and archival 2MASS and 1.49GHz VLA data. The HST images clearly reveal a mid-to-advanced stage major merger whose northwestern and southeastern nuclei have a projected separation of $\sim$8.5kpc. Our HST/H$α$+[N{\sc ii}] image shows regions of ongoing star-formation across the envelope on $\sim$10kpc scales, which are aligned with radio features, supporting the interpretation that the radio emission originates from star-forming regions. The measured H$α$ luminosities imply that the unobscured star-formation rate is $\sim$10-30\,M$_{\odot}$yr$^{-1}$. The GMOS/IFU data reveal two structures in northwestern separated by 850\,pc and by a discontinuity in the velocity field of $\sim$~200~km~s$^{-1}$. We associate the blue-shifted and red-shifted components with, respectively, the distorted disk of northwestern and tidal debris, possibly a tail originating in southeastern. Star-formation is the main ionization source in both components, which have SFRs of $\sim$2.6-7.9\,M$_{\odot}$yr$^{-1}$ and $\sim$1.5-4.5\,M$_{\odot}$yr$^{-1}$, respectively. Fainter line emission bordering these main components is consistent with shock ionization at a velocity $\sim$200~km~s$^{-1}$ and may be the result of an interaction between the tidal tail and the northwestern galaxy's disk. IRAS17526+3253 is one of only a few systems known to host both luminous OH and H$_{2}$O masers. The velocities of the OH and H$_{2}$O maser lines suggest that they are associated with the northwestern and southeastern galaxies, respectively.

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