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arXiv 1901.01640astro-ph.GA
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银河系和质量组装(GAMA):成组中心和卫星的环境猝灭

Galaxy And Mass Assembly (GAMA): Environmental Quenching of Centrals and Satellites in Groups

L. J. M. Davies, A. S. G. Robotham, C. del P. Lagos, S. P. Driver, A. R. H. Stevens, Y. M. Bahé, M. Alpaslan, M. N. Bremer, M. J. I. Brown, S. Brough, J. Bland-… 展开作者

L. J. M. Davies, A. S. G. Robotham, C. del P. Lagos, S. P. Driver, A. R. H. Stevens, Y. M. Bahé, M. Alpaslan, M. N. Bremer, M. J. I. Brown, S. Brough, J. Bland-Hawthorn, L. Cortese, P. Elahi, M. W. Grootes, B. W. Holwerda, A. D. Ludlow, S. McGee, M. Owers, S. Phillipps

摘要:

最近的一些研究发现,当控制恒星和晕质量时,中心星系和卫星星系的被动部分之间存在相似之处。这些结果表明,影响星系的淬火过程在很大程度上是不可知的中央/卫星的地位,这与传统的图片增加卫星淬火通过环境过程,如剥离,扼杀和饥饿。在这里,我们使用星系和质量大会(GAMA)调查进一步探索这一点,GAMA调查的恒星质量比SDSS低约2倍,对于紧密分离的星系更完整(>95%与>70%相比),并确定了非常本地宇宙之外的低晕质量群(M $_{\mathrm{halo}}\sim10^{12}$ M $_{\odot}$在$0.1<z<0.2$)。尽可能地,我们的目标是复制的选择,完整性校正和中央/卫星司以前的研究之一,但发现中心和卫星的被动分数之间的明显差异。我们还发现,我们的被动分数增加的光环卫星的质量比和中心到第二个秩质量比。这表明,在光环质量较低的卫星中,猝灭更有效(与光环与卫星质量比低的卫星相比,光环与卫星质量比高的卫星中的$i.e$),并且在较老的卫星群中更可能是被动的-形成卫星环境猝灭的一致画面。然后,我们讨论了可能的解释先前观察到的相似性,如依赖于组发现的方法。

英文摘要:

Recently a number of studies have found a similarity between the passive fraction of central and satellite galaxies when controlled for both stellar and halo mass. These results suggest that the quenching processes that affect galaxies are largely agnostic to central/satellite status, which contradicts the traditional picture of increased satellite quenching via environmental processes such as stripping, strangulation and starvation. Here we explore this further using the Galaxy And Mass Assembly (GAMA) survey which extends to ~2dex lower in stellar mass than SDSS, is more complete for closely-separated galaxies (>95% compared to >70%), and identifies lower-halo-mass groups outside of the very local Universe (M$_{\mathrm{halo}}\sim10^{12}$M$_{\odot}$ at $0.1<z<0.2$). As far as possible we aim to replicate the selections, completeness corrections and central/satellite division of one of the previous studies but find clear differences between passive fractions of centrals and satellites. We also find that our passive fractions increase with both halo-to-satellite mass ratio and central-to-second rank mass ratio. This suggests that quenching is more efficient in satellites that are low-mass for their halo ($i.e$ at high halo-to-satellite mass ratio in comparison to low halo-to-satellite mass ratio) and are more likely to be passive in older groups - forming a consistent picture of environmental quenching of satellites. We then discuss potential explanations for the previously observed similarity, such as dependence on the group-finding method.

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