arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.01505astro-ph.GA
收藏

作为高红移恒星形成星系类似物的低红移致密恒星形成星系

Low-redshift compact star-forming galaxies as analogues of high-redshift star-forming galaxies

Y. I. Izotov, N. G. Guseva, K. J. Fricke, C. Henkel, D. Schaerer, T. X. Thuan

摘要:

比较了~ 25,000低红移的各种积分特性之间的关系来自斯隆数字巡天(SDSS)数据发布16(DR 16)和高红移的(z<1.0)致密恒星形成星系(CSFGs)(z>1.5)恒星形成星系(SFG)的氧丰度、恒星质量M*、远紫外绝对星等M(FUV),恒星形成率SFR和比恒星形成率sSFR、莱曼连续谱光子产生效率(xi_ion)、紫外连续谱斜率β、[OIII]5007/[OII]3727和[NeIII]3868/[OII]3727比值,以及发射线等效宽度EW([OII]3727)、EW([OIII]5007)和EW(Hα)。我们发现,Hβ发射线的高等效宽度(EW(Hβ)> 100 A)的低z CSFG与高z SFG的关系非常相似,这意味着这两类星系的物理性质非常接近。因此,CSFG很可能是高z宇宙中SFG的极好替代物。它们还延伸到恒星质量较低的星系,低至~10^6 Msun,绝对FUV星等弱至-14 mag.由于它们的接近,CSFG可以比遥远的SFG更详细地研究。因此,这里研究的大样本CSFG的综合特征之间的关系可以证明是非常有用的,我们的理解高Z矮星系在未来的观测与大型地面和空间望远镜。

英文摘要:

We compare the relations among various integrated characteristics of ~25,000 low-redshift (z<1.0) compact star-forming galaxies (CSFGs) from Data Release 16 (DR16) of the Sloan Digital Sky Survey (SDSS) and of high-redshift (z>1.5) star-forming galaxies (SFGs) with respect to oxygen abundances, stellar masses M*, far-UV absolute magnitudes M(FUV), star-formation rates SFR and specific star-formation rates sSFR, Lyman-continuum photon production efficiencies (xi_ion), UV continuum slopes β, [OIII]5007/[OII]3727 and [NeIII]3868/[OII]3727 ratios, and emission-line equivalent widths EW([OII]3727), EW([OIII]5007), and EW(Hα). We find that the relations for low-z CSFGs with high equivalent widths of the Hβemission line, EW(Hβ)>100A, and high-z SFGs are very similar, implying close physical properties in these two categories of galaxies. Thus, CSFGs are likely excellent proxies for the SFGs in the high-z Universe. They also extend to galaxies with lower stellar masses, down to ~10^6 Msun, and to absolute FUV magnitudes as faint as -14 mag. Thanks to their proximity, CSFGs can be studied in much greater detail than distant SFGs. Therefore, the relations between the integrated characteristics of the large sample of CSFGs studied here can prove very useful for our understanding of high-z dwarf galaxies in future observations with large ground-based and space telescopes.

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。

↑