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arXiv 2309.09293astro-ph.GA
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CALIFA巡天中受扰动星系的恒星形成研究 III. 恒星与电离气体运动学分布

Star formation in CALIFA survey perturbed galaxies.III. Stellar & ionized-gas kinematic distributions

Abdías Morales-Vargas, Juan Pablo Torres-Papaqui, Fernando Fabián Rosales-Ortega, Marcel Chow-Martínez, René Alberto Ortega-Minakata, Aitor Carlos Robleto-Orús,… 展开作者

Abdías Morales-Vargas, Juan Pablo Torres-Papaqui, Fernando Fabián Rosales-Ortega, Marcel Chow-Martínez, René Alberto Ortega-Minakata, Aitor Carlos Robleto-Orús, the CALIFA survey Collaboration

AI总结:

本文通过比较CALIFA巡天中受潮汐扰动与对照星系内恒星形成区的恒星和电离气体速度弥散度分布,发现伴星影响未显著扰动其运动学特征,气体结果受数据统计变异性限制,为系列研究收官。

摘要:

我们获取了CALIFA巡天中受潮汐扰动(扰动)和未受潮汐扰动(对照)星系内恒星形成区的恒星(合成模型谱线吸收)和电离气体(Hα谱线发射)的运动学分布。我们通过测量数据集自身的统计变异性来设定速度弥散度的不确定度。利用这些采用的不确定度,并考虑光栅设备的灵敏度,我们建立了可靠性阈值,从而筛选出可靠的速度弥散度。基于这一筛选,我们将对照星系与扰动星系中的恒星形成spaxel在速度上最接近的平移处(去红移)进行配对。我们比较了它们各自的速度弥散度分布。在扰动星系中,恒星和气体成分的中值速度弥散度分别略高于和等于对照星系中的对应值。速度弥散度的展布以及速度平移-速度弥散度空间均与此结果一致。与强相互作用系统中众所周知的趋势不同,恒星和电离气体的运动并未受到邻近伴星影响的扰动。对于气体成分,这一结果源于其数据较差的统计变异性,这是由高谱线强度导出的速度弥散度分布紧密所致。本分析为系列研究的收官之作,此前的研究表明,拥有邻近伴星的星系中的恒星形成区经历了更显著的气体内流,导致其恒星形成活动及相应的金属含量出现差异。

英文摘要:

We obtain the kinematic distributions of stars (synthetic model line absorption) and ionized gas (H$α$ line emission) for star-forming regions residing in CALIFA survey tidally perturbed (perturbed) and non-tidally perturbed (control) galaxies. We set the uncertainties of the velocity dispersion by measuring the statistical variability of the datasets themselves. Using these adopted uncertainties and considering the sensitivity of the grating device, we establish thresholds of reliability that allow us to select reliable velocity dispersions. From this selection, we pair the star-forming spaxels between control and perturbed galaxies at the closest shifts in velocity (de-redshifting). We compare their respective distributions of velocity dispersion. In perturbed galaxies, median velocity dispersions for the stellar and gaseous components are minimally higher and equal, respectively, than those in control galaxies. The spread in velocity dispersion and the velocity shift - velocity dispersion space agree with this result. Unlike the well-known trend in strongly interacting systems, the stellar and ionized-gas motions are not disturbed by the influence of close companions. For the gaseous component, this result is due to the poor statistical variability of its data, a consequence of the tightness in velocity dispersion derived from high spectral line intensities. This analysis concludes the series, which previously showed star-forming regions in galaxies with close companions undergoing more prominent gas inflows, resulting in differences in their star formation and consequent metal content.

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