MAMMOTH: confirmation of two massive galaxy overdensities at z = 2.24 with Hα emitters

MAMMOTH: confirmation of two massive galaxy overdensities at z = 2.24 with Hα emitters
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MAMMOTH:用 Hα 发射器确认 z = 2.24 处两个巨大星系的密度过高

DOI:
10.1093/mnras/staa2882
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发表时间:
2020-09
影响因子:
4.8
通讯作者:
Shi Dong Dong
Shi Dong Dong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zheng Xian Zhong;Cai Zheng;An Fang Xia;Fan Xiaohui;Shi Dong Dong

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宇宙恒星形成高峰期的大质量星系超密度为星系形成理论和大尺度结构理论提供了理想的试验台。我们的报告证实了两个大质量星系的超密度,它们分别是BOSS1244和BOSS1542,它们是从这个庞大的项目中挑选出来的,它们是用类星体光谱上15$-$30$h^-1}$MPC尺度上的Ly$\α$吸收来选择的。我们使用H$\α$发射体(HAES)作为密度示踪剂,并利用CFHT/WIRCam获得的深窄带和宽带成像数据对其进行识别。在这两个地区共检测到244和223个谱线发射体,预计其中$196\pM2$和$175\pM2$是H$\α$通量为$>2.5倍10^{-17}$erg S$^{-1}$cm$^-2}$(对应的SFR为$>$5 M$\ODOT$yr$^-1}$)。HAE候选者的发现率表明,在54×32×32$CMPC$^3$的体积上,超密度因子分别为$Delta_{rmGal}=5.6\pm0.3$和$4.9\pm0.3$。当聚焦于标尺的高密度区域$10-15$CMPC时,过密度因子增加$2-3$。有趣的是,HAE密度图显示BOSS1244包含主导结构,而BOSS1542表现为巨大的丝状结构。我们测量了H$\α$发光度函数,发现BOSS1244‘S发光度函数与同一历元的普通场的发光度函数几乎相同,而BOSS1542显示出过剩的HAES,具有高的H$\α$发光度,表明存在恒星形成或活动星系核活动增强的现象。我们的结论是,这两个巨大的巨型超密度星系正在经历一次快速的星系质量聚集。
Massive galaxy overdensities at the peak epoch of cosmic star formation provide ideal testbeds for the formation theories of galaxies and large-scale structure. We report the confirmation of two massive galaxy overdensities at $z=2.24$, BOSS1244 and BOSS1542, selected from the MAMMOTH project using Ly$\alpha$ absorption from the intergalactic medium over the scales of 15$-$30 $h^{-1}$ Mpc imprinted on the quasar spectra. We use H$\alpha$ emitters (HAEs) as the density tracer and identify them using deep narrowband $H_2S1$ and broadband $K_{\rm s}$ imaging data obtained with CFHT/WIRCam. In total, 244 and 223 line emitters are detected in these two fields, and $196\pm 2$ and $175\pm 2$ are expected to be HAEs with an H$\alpha$ flux of $> 2.5\times 10^{-17}$ erg s$^{-1}$ cm$^{-2}$ (corresponding to an SFR of $>$5 M$_\odot$ yr$^{-1}$). The detection rate of HAE candidates suggests an overdensity factor of $\delta_{\rm gal}=5.6\pm0.3$ and $4.9\pm0.3$ over the volume of $54\times32\times32$ cMpc$^3$. The overdensity factor increases $2-3$ times when focusing on the high-density regions of scales $10-15$ cMpc. Interestingly, the HAE density maps reveal that BOSS1244 contains a dominant structure, while BOSS1542 manifests as a giant filamentary structure. We measure the H$\alpha$ luminosity functions (HLF), finding that BOSS1244's HLF is nearly identical to that of the general field at the same epoch, while BOSS1542 shows an excess of HAEs with high H$\alpha$ luminosity, indicating the presence of enhanced star formation or AGN activity. We conclude that the two massive MAMMOTH overdensities are undergoing a rapid galaxy mass assembly.
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