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arXiv 1702.06953astro-ph.GA
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UVUDF:UV在宇宙正午的光度函数

UVUDF: UV Luminosity Functions at the cosmic high-noon

Vihang Mehta, Claudia Scarlata, Marc Rafelski, Timothy Gburek, Harry I. Teplitz, Anahita Alavi, Michael Boylan-Kolchin, Steven Finkelstein, Jonathan P. Gardner,… 展开作者

Vihang Mehta, Claudia Scarlata, Marc Rafelski, Timothy Gburek, Harry I. Teplitz, Anahita Alavi, Michael Boylan-Kolchin, Steven Finkelstein, Jonathan P. Gardner, Norman Grogin, Anton Koekemoer, Peter Kurczynski, Brian Siana, Alex Codoreanu, Duilia F. de Mello, Kyoung-Soo Lee, Emmaris Soto

摘要:

本文给出了宇宙恒星形成率的峰值--\textit{high noon}期间恒星形成星系的剩余1500光年紫外光度函数(LF)。我们使用深NUV成像数据作为\textit{Hubble}紫外超深场(UVUDF)计划的一部分,以及现有的深光学和近红外覆盖的HUDF。我们选择F225 W,F275 W和F336 W脱落样本使用莱曼中断技术,以及在相应的红移范围内使用光度红移选择的样本和测量静止帧UV LF分别在$z\sim1.7,2.2,3.0$,使用修改的最大似然估计。我们进行模拟,以量化调查和样本的不完整性UVUDF样本,以纠正有效体积计算的LF。我们选择的星系下降到$M_{UV}=-15.9,-16.3,-16.8$和适合的$α=-1.20^{+0.10}_{-0.13}, -1.32^{+0.10}_{-0.14}, -1.39^{+0.08}_{-0.12}$在$1.4<z<1.9$,$1.8<z<2.6$和$2.4<z<3.6$,分别在昏暗端的斜率。我们比较了这些紫外观测的$z\sim2$星系的恒星形成性质与Hα和紫外$+$红外观测的结果。我们发现,与Hα和UV $+$ IR相比,UV LF中缺乏高SFR源,这可能是由于用于校正尘埃的通用$IRX-β$关系没有正确解释尘埃SFG。我们通过\textit{abundance matching}、静止帧UV LF和Hα LF计算体积平均UV与Hα的比值。我们发现,朝向低质量星系($M_\star \lesssim 5\times10^9$ M $_\odot$)的UV/Hα比值增加。我们的结论是,这可能是由于一个更大的贡献,从星爆星系相比,高质量的结束。

英文摘要:

We present the rest-1500Å UV luminosity functions (LF) for star-forming galaxies during the cosmic \textit{high noon} -- the peak of cosmic star formation rate at $1.5<z<3$. We use deep NUV imaging data obtained as part of the \textit{Hubble} Ultra-Violet Ultra Deep Field (UVUDF) program, along with existing deep optical and NIR coverage on the HUDF. We select F225W, F275W and F336W dropout samples using the Lyman break technique, along with samples in the corresponding redshift ranges selected using photometric redshifts and measure the rest-frame UV LF at $z\sim1.7,2.2,3.0$ respectively, using the modified maximum likelihood estimator. We perform simulations to quantify the survey and sample incompleteness for the UVUDF samples to correct the effective volume calculations for the LF. We select galaxies down to $M_{UV}=-15.9,-16.3,-16.8$ and fit a faint-end slope of $α=-1.20^{+0.10}_{-0.13}, -1.32^{+0.10}_{-0.14}, -1.39^{+0.08}_{-0.12}$ at $1.4<z<1.9$, $1.8<z<2.6$, and $2.4<z<3.6$, respectively. We compare the star formation properties of $z\sim2$ galaxies from these UV observations with results from Hα and UV$+$IR observations. We find a lack of high SFR sources in the UV LF compared to the Hα and UV$+$IR, likely due to dusty SFGs not being properly accounted for by the generic $IRX-β$ relation used to correct for dust. We compute a volume-averaged UV-to-Hα ratio by \textit{abundance matching} the rest-frame UV LF and Hα LF. We find an increasing UV-to-Hα ratio towards low mass galaxies ($M_\star \lesssim 5\times10^9$ M$_\odot$). We conclude that this could be due to a larger contribution from starbursting galaxies compared to the high-mass end.

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