arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1909.05094astro-ph.GA
收藏

VIMOS公开河外红移巡天(VIPERS)--0.5 < z < 0.8时大质量被动星系的环境-尺寸关系

The VIMOS Public Extragalactic Redshift Survey (VIPERS) -- Environment-size relation of massive passive galaxies at 0.5 < z < 0.8

A. Gargiulo, O. Cucciati, B. Garilli, M. Scodeggio, M. Bolzonella, G. Zamorani, G. De Lucia, J. Krywult, L. Guzzo, B. R. Granett, S. de la Torre, U. Abbas, C. A… 展开作者

A. Gargiulo, O. Cucciati, B. Garilli, M. Scodeggio, M. Bolzonella, G. Zamorani, G. De Lucia, J. Krywult, L. Guzzo, B. R. Granett, S. de la Torre, U. Abbas, C. Adami, S. Arnouts, D. Bottini, A. Cappi, P. Franzetti, A. Fritz, C. Haines, A. J. Hawken, A. Iovino, V. Le Brun, O. Le Fèvre, D. Maccagni, K. Małek, F. Marulli, T. Moutard, M. Polletta, A. Pollo, L. A. M. Tasca, R. Tojeiro, D. Vergani, A. Zanichelli, J. Bel, E. Branchini, J. Coupon, O. Ilbert, L. Moscardini, J. A. Peacock

摘要:

利用VIPERS巡天的统计数据,在红移0.5<z<0.8的范围内,研究了大质量被动星系(Mstar>10^11 Msun)的表面平均恒星质量密度Sigma=Mstar/(2*pi* Re ^2)与其周围环境的关系。被动星系是根据它们的NUVrK颜色(约900个天体)选择的,环境被定义为星系密度对比度,三角洲,使用第五近邻方法。在两个恒星质量箱中进行了Sigma与Delta的分析。在Mstar<2*10^11 Msun的星系中,没有观察到Sigma和Delta之间的相关性。这意味着卫星星系的吸积,这是更频繁地在密集的环境和有效地减少星系西格玛,是不相关的形成和演化这些系统。相反,在Mstar>2*10^11 Msun的星系中,我们发现相对于其他环境,在致密区中具有低Sigma的MPG过剩,而高Sigma的MPG不足。我们将这一结果解释为由于一些高Sigma MPG(<MPG总人口的1%)迁移到低Sigma MPG,可能是通过合并或小卫星的同类相食。总之,我们的研究结果意味着卫星星系的吸积在大多数MPG的大规模组装历史中具有边缘作用。我们以前发现,VIPERS大质量恒星形成星系(MSFG)的数密度从z=0.8到z=0.5迅速下降,这反映了MPG数密度的快速增加。这表明z>0.8的MSFG迁移到MPG群体。在这里,我们研究了z>0.8时MSFG的Sigma-Delta关系,发现它与z<0.8时的低Sigma MPG的Sigma-Delta关系在1 sigma内一致。因此,这篇论文和我们之前的论文的结果表明,z>0.8的MSFG在数量和环境方面与z<0.8的低σ MPG的祖先一致。

英文摘要:

We use the statistics of the VIPERS survey to investigate the relation between the surface mean stellar mass density Sigma=Mstar/(2*pi*Re^2) of massive passive galaxies (MPGs, Mstar>10^11 Msun) and their environment in the redshift range 0.5<z<0.8. Passive galaxies were selected on the basis of their NUVrK colors (~900 objects), and the environment was defined as the galaxy density contrast, delta, using the fifth nearest-neighbor approach. The analysis of Sigma vs. delta was carried out in two stellar mass bins. In galaxies with Mstar<2*10^11 Msun, no correlation between Sigma and delta is observed. This implies that the accretion of satellite galaxies, which is more frequent in denser environments and efficient in reducing the galaxy Sigma, is not relevant in the formation and evolution of these systems. Conversely, in galaxies with Mstar>2*10^11 Msun, we find an excess of MPGs with low Sigma and a deficit of high-Sigma MPGs in the densest regions wrt other environments. We interpret this result as due to the migration of some high-Sigma MPGs (<1% of the total population of MPGs) into low-Sigma MPGs, probably through mergers or cannibalism of small satellites. In summary, our results imply that the accretion of satellite galaxies has a marginal role in the mass-assembly history of most MPGs. We have previously found that the number density of VIPERS massive star-forming galaxies (MSFGs) declines rapidily from z=0.8 to z=0.5, which mirrors the rapid increase in the number density of MPGs. This indicates that the MSFGs at z>0.8 migrate to the MPG population. Here, we investigate the Sigma-delta relation of MSFGs at z>0.8 and find that it is consistent within 1 sigma with that of low-Sigma MPGs at z<0.8. Thus, the results of this and our previous paper show that MSFGs at z>0.8 are consistent in terms of number and environment with being the progenitors of low-Sigma MPGs at z<0.8.

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。

↑