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arXiv 1104.0698astro-ph.CO
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正常螺旋和禁止螺旋有什么不同?

How Different are Normal and Barred Spirals?

Sidney van den Bergh

摘要:

在哈勃望远镜a - ab - b - bc阶段的范围内,没有发现正常螺旋和棒旋之间的显着颜色差异。此外,在相同的哈勃级数范围内,正常星系和棒星系的光度分布之间没有明显的差异。然而,SBc星系被发现在99%的置信度下系统地比Sc星系暗。观察到正常的和棒旋的哈勃阶段a - ab - b - bc具有难以区分的固有颜色暗示了这样的螺旋星系中的棒可能是短暂的结构。最后指出,S 0和SB 0型透镜星系比其他早型星系的系统性暗,这表明这类星系所处的演化轨道与E-Sa- Sb -Sc和E-SBa- SBb - SBc序列中的星系系统性不同。

英文摘要:

No significant color differences are found between normal and barred spirals over the range of Hubble stages a - ab - b - bc. Furthermore, no significant difference is seen between the luminosity distributions of normal and barred galaxies over the same range of Hubble stages. However, SBc galaxies are found to be systematically fainter than Sc galaxies at 99% confidence. The observation that normal and barred spirals with Hubble stages a - ab - b - bc have indistinguishable intrinsic colors hints at the possibility that the bars in such spiral galaxies might be ephemeral structures. Finally, it is pointed out that lenticular galaxies of types S0 and SB0 are systematically fainter than are other early-type galaxies, suggesting that such galaxies are situated on evolutionary tracks that differ systematically from those of galaxies that lie along the E - Sa - Sb -Sc and E - SBa - SBb - SBc sequences.

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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