期刊
ASTROPHYSICAL JOURNAL
卷 774, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0004-637X/774/2/130
关键词
galaxies: abundances; galaxies: clusters: general; galaxies: evolution; galaxies: formation; galaxies: high-redshift
资金
- National Science Foundation's Telescope System Instrumentation Program
- David and Lucile Packard Foundation
- NSF [1106171]
We present Keck/MOSFIRE observations of the role of environment in the formation of galaxies at z similar to 2. Using K-band spectroscopy of H alpha and [N II] emission lines, we have analyzed the metallicities of galaxies within and around a z = 2.3 protocluster discovered in the HS1700+643 field. Our main sample consists of 23 protocluster and 20 field galaxies with estimates of stellar masses and gas-phase metallicities based on the N2 strong-line metallicity indicator. With these data we have examined the mass-metallicity relation with respect to environment at z similar to 2. We find that field galaxies follow the well-established trend between stellar mass and metallicity, such that more massive galaxies have larger metallicities. The protocluster galaxies, however, do not exhibit a dependence of metallicity on mass, with the low-mass protocluster galaxies showing an enhancement in metallicity compared to field galaxies spanning the same mass range. A comparison with galaxy formation models suggests that the mass-dependent environmental trend we observed can be qualitatively explained in the context of the recycling of momentum-driven galaxy wind material. Accordingly, winds are recycled on a shorter timescale in denser environments, leading to an enhancement in metallicity at fixed mass for all but the most massive galaxies. Future hydrodynamical simulations of z similar to 2 overdensities matching the one in the HS1700 field will be crucial for understanding the origin of the observed environmental trend in detail.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据