arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1004.5463astro-ph.CO
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棒确实驱动螺旋密度波

Bars do drive spiral density waves

H. Salo, E. Laurikainen, R. Buta, J. H. Knapen

摘要:

最近,Buta et al.(2009)研究了这个问题“做酒吧驱动螺旋密度波?”,这一观点得到了理论研究的支持,也来自于Block et al(2004)的初步观察分析。他们用深AAT K_s波段图像估算了23个星系的最大棒状强度Q_b、最大螺旋强度Q_s和最大m=2臂对比度A_2s。这些数据与先前发表的OSUBSGS样本中147个星系的Q_b和Q_s值以及Block et al(2004)的12个星系的Q_b和Q_s值相结合。对于组合样本,Q_b与Q_s之间的相关性较弱,而AAT子集单独显示Q_b与Q_s之间无显著相关性,Q_b与A_2s之间也无显著相关性。在Durbala等人中获得了类似的阴性结果。(2009)46个星系。根据这些研究,上述问题的答案仍然不确定。在这里,我们使用一种新的方法,并表明,虽然最大酒吧和螺旋参数之间的相关性很弱,这些参数相关时,比较本地。对于OSUBSGS样本的统计学显着的相关性被发现之间的局部螺旋振幅,并迫使由于酒吧的潜力在相同的距离,出1.6酒吧半径(典型的酒吧扰动,然后是百分之几的顺序)。此外,对于23个AAT星系的样本,我们发现一个显着的相关性的本地参数到1.4酒吧半径。我们的新结果证实,至少在统计意义上,酒吧确实驱动螺旋密度波。

英文摘要:

Recently, Buta etal. (2009) examined the question "Do Bars Drive Spiral Density Waves?", an idea supported by theoretical studies and also from a preliminary observational analysis Block etal (2004). They estimated maximum bar strengths Q_b, maximum spiral strengths Q_s, and maximum m=2 arm contrasts A_2s for 23 galaxies with deep AAT K_s-band images. These were combined with previously published Q_b and Q_s values for 147 galaxies from the OSUBSGS sample and with the 12 galaxies from Block etal(2004). Weak correlation between Q_b and Q_s was confirmed for the combined sample, whereas the AAT subset alone showed no significant correlations between Q_b and Q_s, nor between Q_b and A_2s. A similar negative result was obtained in Durbala etal. (2009) for 46 galaxies. Based on these studies, the answer to the above question remains uncertain. Here we use a novel approach, and show that although the correlation between the maximum bar and spiral parameters is weak, these parameters do correlate when compared locally. For the OSUBSGS sample a statistically significant correlation is found between the local spiral amplitude, and the forcing due to the bar's potential at the same distance, out to 1.6 bar radii (the typical bar perturbation is then of the order of a few percent). Also for the sample of 23 AAT galaxies we find a significant correlation between local parameters out to 1.4 bar radii. Our new results confirm that, at least in a statistical sense, bars do indeed drive spiral density waves.

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