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arXiv 2304.00515astro-ph.GA
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环星系中性氢巡天(HI-RINGS)——棒旋结构对环星系中HI气体的影响

The HI in Ring Galaxies Survey (HI-RINGS) -- Effects of the bar on the HI gas in ring galaxies

Chandrashekar Murugeshan, Robert Dzudzar, Ryan Bagge, Tamsyn O'Beirne, Ivy Wong, Virginia Kilborn, Michelle Cluver, Katharina Lutz, Ahmed Elagali

AI总结:

本研究利用ATCA对24个南环星系开展高分辨率HI巡天,发现棒旋星系多存在HI缺失,验证了林德布拉德共振理论对棒旋环星系共振环位置的预测,并测得棒旋图案速度范围与前人研究一致。

摘要:

我们利用澳大利亚望远镜致密阵列(ATCA)开展了一项新的高分辨率中性原子氢(HI)环星系巡天。我们选取了来自Buta(1995)《南环星系巡星星表》的24个环星系作为样本,旨在研究共振驱动、碰撞驱动和相互作用驱动的环星系的起源。在本工作中,我们概述了样本情况,并研究了它们的整体和空间分辨HI性质。此外,我们还通过测量恒星形成率(SFR)及其空间分辨的SFR面密度剖面,探究了它们的恒星形成性质。我们发现样本中大多数棒旋星系存在HI缺失现象,这暗示了棒旋结构是导致其HI缺失的原因。此外,对于样本中通过长期演化形成的棒旋环星系,我们应用林德布拉德(Lindblad)共振理论预测共振环的位置,发现预测结果与观测结果高度吻合。我们识别出位于某一主共振处的HI气体环和/或恒星形成环。最后,我们测量了子样本星系的棒旋图案速度($Ω_{\textrm{bar}}$),发现其取值范围为10–90 km s$^{-1}$ kpc$^{-1}$,与以往研究结果高度一致。

英文摘要:

We present a new high-resolution neutral atomic hydrogen (HI) survey of ring galaxies using the Australia Telescope Compact Array (ATCA). We target a sample of 24 ring galaxies from the Buta (1995) Southern Ring Galaxy Survey Catalogue in order to study the origin of resonance-, collisional- and interaction-driven ring galaxies. In this work, we present an overview of the sample and study their global and resolved HI properties. In addition, we also probe their star formation properties by measuring their star formation rates (SFR) and their resolved SFR surface density profiles. We find that a majority of the barred galaxies in our sample are HI deficient, alluding to the effects of the bar in driving their HI deficiency. Furthermore, for the secularly evolving barred ring galaxies in our sample, we apply Lindblad's resonance theory to predict the location of the resonance rings and find very good agreement between predictions and observations. We identify rings of HI gas and/or star formation co-located at one or the other major resonances. Lastly, we measure the bar pattern speed ($Ω_{\textrm{bar}}$) for a sub-sample of our galaxies and find that the values range from 10 -- 90 km s$^{-1}$ kpc$^{-1}$, in good agreement with previous studies.

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