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arXiv 2001.10544astro-ph.GA
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在DAWN调查中在$z \sim$ 0.62处H $α$发射体的综合研究:需要深宽区域

A comprehensive study of H$α$ emitters at $z \sim$ 0.62 in the DAWN survey: the need for deep and wide regions

Santosh Harish, Alicia Coughlin, James E. Rhoads, Sangeeta Malhotra, Steven L. Finkelstein, Matthew Stevans, Vithal S. Tilvi, Ali Ahmad Khostovan, Sylvain Veill… 展开作者

Santosh Harish, Alicia Coughlin, James E. Rhoads, Sangeeta Malhotra, Steven L. Finkelstein, Matthew Stevans, Vithal S. Tilvi, Ali Ahmad Khostovan, Sylvain Veilleux, Junxian Wang, Pascale Hibon, Johnnes Zabl, Bhavin Joshi, John Pharo, Isak Wold, Lucia A. Perez, Zhen-Ya Zheng, Ronald Probst, Rob Swaters, Bahram Mobasher, Tianxing Jiang, Huan Yang

摘要:

我们提出了新的估计的光度函数(LF)和恒星形成率密度(SFRD)的H $α$选择的样品在$z\sim0.62$从深宽窄波段(DAWN)调查。我们的结果基于扩展COSMOS区域中的新H $α$样本(与Coughlin等人2018年相比),包含侧翼字段,导致$\sim$ 1.5 deg $^2$的总面积覆盖。共有241 H $α$发射器选择了强大的选择标准的基础上,使用分光光度红移和宽带颜色颜色分类。我们探索不同的尘埃修正处方的影响,通过计算LF和SFRD使用恒定的尘埃消光校正,A{ $_{\textrm{H}α}=1$ } mag,亮度相关的校正,和恒星质量相关的校正。由此产生的H $α$ LF很好地拟合使用Schechter函数与最佳拟合参数:L $^*=10^{42.24}$ erg s $^{-1}$,$ϕ^*=10^{-2.85}$ Mpc $^{-3}$,$α= -1.62$为常数尘埃校正,L $^*=10^{42.31}$ erg s $^{-1}$,$ϕ^*=10^{-2.8}$ Mpc $^{-3}$,$α=-1.39$为光度依赖的尘埃校正,和L $^*=10^{42.36}$ erg s $^{-1}$,$ϕ^*=10^{-2.91}$ Mpc $^{-3}$,$α= -1.48$,恒星质量依赖的尘埃校正。DAWN巡天的深度和广度可以有效地对H $α$发射体在很宽的光度范围内进行采样,从而对LF的暗端和亮端提供更好的约束。此外,SFRD估算的$ρ_{\textrm{SFR}}=10^{-1.39}$ M $_{\odot}$ yr $^{-1}$ Mpc $^{-3}$(常数尘埃修正)、$ρ_{\textrm{SFR}}=10^{-1.47}$ M $_{\odot}$ yr $^{-1}$ Mpc $^{-3}$(光度相关尘埃修正)和$ρ_{\textrm{SFR}}=10^{-1.49}$ M $_{\odot}$ yr $^{-1}$ Mpc $^{-3}$(恒星质量相关尘埃修正)与从以前的H $α$巡天中看到的SFRD随红移的演化($0 < z < 2$)非常一致。

英文摘要:

We present new estimates of the luminosity function (LF) and star formation rate density (SFRD) for an H$α$ selected sample at $z\sim0.62$ from the Deep And Wide Narrow-band (DAWN) survey. Our results are based on a new H$α$ sample in the extended COSMOS region (compared to Coughlin et al. 2018) with the inclusion of flanking fields, resulting in a total area coverage of $\sim$1.5 deg$^2$. A total of 241 H$α$ emitters were selected based on robust selection criteria using spectro-photometric redshifts and broadband color-color classification. We explore the effect of different dust correction prescriptions by calculating the LF and SFRD using a constant dust extinction correction, A{$_{\textrm{H}α}=1$} mag, a luminosity-dependent correction, and a stellar-mass dependent correction. The resulting H$α$ LFs are well fitted using Schechter functions with best-fit parameters: L$^*=10^{42.24}$ erg s$^{-1}$, $ϕ^*=10^{-2.85}$ Mpc$^{-3}$, $α= -1.62$ for constant dust correction, L$^*=10^{42.31}$ erg s$^{-1}$, $ϕ^*=10^{-2.8}$ Mpc$^{-3}$, $α=-1.39$ for luminosity-dependent dust correction, and L$^*=10^{42.36}$ erg s$^{-1}$, $ϕ^*=10^{-2.91}$ Mpc$^{-3}$, $α= -1.48$, for stellar mass-dependent dust correction. The deep and wide nature of the DAWN survey effectively samples H$α$ emitters over a wide range of luminosities, thereby providing better constraints on both the faint and bright end of the LF. Also, the SFRD estimates $ρ_{\textrm{SFR}}=10^{-1.39}$ M$_{\odot}$yr$^{-1}$Mpc$^{-3}$ (constant dust correction), $ρ_{\textrm{SFR}}=10^{-1.47}$ M$_{\odot}$yr$^{-1}$Mpc$^{-3}$ (luminosity-dependent dust correction), and $ρ_{\textrm{SFR}}=10^{-1.49}$ M$_{\odot}$yr$^{-1}$Mpc$^{-3}$ (stellar mass-dependent dust correction) are in good agreement with the evolution of SFRD across redshifts ($0 < z < 2$) seen from previous H$α$ surveys.

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