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arXiv 2404.04555astro-ph.GA
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触须星系并合体云尺度分子气体性质:与 PHANGS-ALMA 星系及 NGC 3256 的比较研究

Cloud-Scale Molecular Gas Properties of the Antennae Merger: A Comparative Study with PHANGS-ALMA Galaxies and NGC 3256

Nathan Brunetti, Christine D. Wilson, Hao He, Jiayi Sun, Adam K. Leroy, Erik Rosolowsky, Ashley Bemis, Frank Bigiel, Brent Groves, Toshiki Saito, Eva Schinnerer

AI总结:

本文利用 ALMA CO 2-1 观测在 55 pc 尺度比较触须星系、70 个 PHANGS 星系与 NGC 3256,揭示并合阶段对分子气体湍流、维里状态及后续星暴的影响。

摘要:

我们展示了利用阿塔卡马大型毫米/亚毫米波阵(ALMA)获得的、在 CO 2-1 谱线中以 55 pc 分辨率对触须星系并合体(NGC 4038/9)中心 9 kpc 区域的观测。我们采用基于像素的分析,将触须星系中的气体性质与来自 PHANGS-ALMA 巡天的 70 个近邻旋涡星系,以及并合星系和最近的亮红外星系 NGC 3256 中的气体性质进行比较。与在匹配空间分辨率下的 PHANGS 星系相比,触须星系中的分子气体表现出一些最高的面密度、速度弥散、峰值亮温及湍流压力。然而,触须星系中的维里参数与许多 PHANGS 星系相符。NGC 3256 具有与触须星系相近的气体面密度,但其核区速度弥散更高,并且全系统范围的峰值亮温和维里参数也更高。NGC 3256 在并合过程中处于比触须星系更晚的阶段,这可能导致更强烈的并合驱动气体流,从而提升气体中的湍流。NGC 3256 中较高的维里参数可能表明,随着 NGC 3256 走出星暴阶段,这种增强的湍流正在抑制未来的恒星形成。相比之下,触须星系中相对正常的维里参数可能意味着它即将经历一次新的恒星形成爆发。

英文摘要:

We present observations of the central 9 kpc of the Antennae merger (NGC 4038/9) at 55 pc resolution in the CO 2-1 line obtained with the Atacama Large Millimeter/submillimeter Array (ALMA). We use a pixel-based analysis to compare the gas properties in the Antennae to those in 70 nearby spiral galaxies from the PHANGS-ALMA survey, as well as the merger and nearest luminous infrared galaxy NGC 3256. Compared to PHANGS galaxies at matched spatial resolution, the molecular gas in the Antennae exhibits some of the highest surface densities, velocity dispersions, peak brightness temperatures, and turbulent pressures. However, the virial parameters in the Antennae are consistent with many of the PHANGS galaxies. NGC 3256 has similar gas surface densities but higher nuclear velocity dispersions than the Antennae, as well as higher system-wide peak brightness temperatures and virial parameters. NGC 3256 is at a later stage in the merging process than the Antennae, which may result in more intense merger-driven gas flows that could drive up the turbulence in the gas. The high virial parameters in NGC 3256 may indicate that this increased turbulence is suppressing future star formation as NGC 3256 moves out of the starburst phase. In comparison, the relatively normal virial parameters in the Antennae may imply that it is about to undergo a new burst of star formation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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