论文标题
猛mm象：确认两个巨大的星系过重，$ z = 2.24 $，h $α$ emitters
MAMMOTH: Confirmation of Two Massive Galaxy Overdensities at $z=2.24$ with H$α$ Emitters
论文作者
论文摘要
宇宙恒星形成峰值时期的巨大星系过度繁殖为星系和大规模结构的地层理论提供了理想的测试床。我们报告了$ z = 2.24 $，boss1244和boss1542的两个大型星系过重的确认，这些质量是从猛mm象项目中选择的，它使用ly $α$吸收了15 $ - $ 30 $ h^{-1} $ mpc mpc mpc在quasar spectra上的15 $ - $ 30 $ - $ 30 $ - $ 30 $ - $ 30 $ - $α$吸收。我们将H $α$发射器（HAE）用作密度示踪剂，并使用深窄带$ H_2S1 $和宽带$ k _ {\ rm s} $成像数据使用CFHT/WIRCAM获得的数据。在这两个字段中总共检测到244和223条发射器，预计$ 196 \ pm 2 $和$ 175 \ pm 2 $将是HAE，其H $α$ flux $> 2.5 \ times 10^{ - 17} $ ERG S $^{ - 1} $^{ - 1} $ CM $ cm $ cm $^{ - 2} $ $ $ $ $ $ $ $> $> $} yr $^{ - 1} $）。 HAE候选者的检测率表明，过度密度系数为$δ_{\ rm gal} = 5.6 \ pm0.3 $和$ 4.9 \ pm0.3 $，$ 54 \ times32 \ times32 $ cmpc $ cmpc $^3 $。当关注量表的高密度区域$ 10-15 $ CMPC时，过度密度因子增加了$ 2-3 $倍。有趣的是，HAE密度图显示Boss1244包含一个主导结构，而Boss1542则表现为巨型丝状结构。我们测量了H $α$光度功能（HLF），发现Boss1244的HLF与同一时期的一般场的HLF几乎相同，而Boss1542显示出过量的H $α$亮度高的HAE，表明存在增强的星形形成或AGN活性。我们得出的结论是，这两个巨大的猛mm象过度正在经历一个快速的星系质量组件。
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$α$ absorption from the intergalactic medium over the scales of 15$-$30 $h^{-1}$ Mpc imprinted on the quasar spectra. We use H$α$ 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$α$ 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 $δ_{\rm gal}=5.6\pm0.3$ 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$α$ 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$α$ 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.
