A Foreground Masking Strategy for [C ii] Intensity Mapping Experiments Using Galaxies Selected by Stellar Mass and Redshift
A Foreground Masking Strategy for [C ii] Intensity Mapping Experiments Using Galaxies Selected by Stellar Mass and Redshift
复制标题
使用由恒星质量和红移选择的星系进行 [C ii] 强度映射实验的前景遮蔽策略
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
M. Zemcov
中科院分区：
文献类型：
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作者：
Guochao Sun;L. Moncelsi;M. Viero;Marta B. Silva;J. Bock;C. Bradford;Tzu;Yun;A. Cooray;A. Crites;S. Hailey;J. Hunacek;B. Uzgil;M. Zemcov
强度映射提供了一种独特的方法来探测再电离时代（EoR），当中性星系间介质被第一个星系发射的高能光子电离时。[C ii] 158 μm精细结构线通常是恒星形成星系中最亮的发射线之一，因此是全球EoR恒星形成活动的有希望的示踪剂。然而，在6 > z > 8处的[C ii]强度图受到来自低红移星系的CO旋转线发射（3≤Jupp≤6）的干扰。在这里，我们提出了一种策略，以前景星系CO排放模型为指导，在即将到来的[C ii]强度测绘实验中去除前景污染。该模型基于从COSMOS/UltraVISTA巡天中选取的k波段中z < 3和恒星质量为M * > 10 8 M⊙的星系的红外总光度的平均值和散射值的经验测量，可以转换为CO线强度。模拟场的层析Ionized-carbon映射实验中,我们发现,屏蔽了“压”(spectral-spatial元素)包含前景星系发现使用一个优化公司流量阈值导致z-dependent标准m K AB≲22(或m *≳10 9 m⊙)在z < 1,二[C] / COtot功率比的≳10 K = 0.1 h / Mpc可实现的,代价是一个温和的≲调查总量8%的损失。
Intensity mapping provides a unique means to probe the epoch of reionization (EoR), when the neutral intergalactic medium was ionized by energetic photons emitted from the first galaxies. The [C ii] 158 μm fine-structure line is typically one of the brightest emission lines of star-forming galaxies and thus a promising tracer of the global EoR star formation activity. However, [C ii] intensity maps at 6 ≲ z ≲ 8 are contaminated by interloping CO rotational line emission (3 ≤ Jupp ≤ 6) from lower-redshift galaxies. Here we present a strategy to remove the foreground contamination in upcoming [C ii] intensity mapping experiments, guided by a model of CO emission from foreground galaxies. The model is based on empirical measurements of the mean and scatter of the total infrared luminosities of galaxies at z < 3 and with stellar masses M * > 10 8 M ⊙ selected in the K-band from the COSMOS/UltraVISTA survey, which can be converted to CO line strengths. For a mock field of the Tomographic Ionized-carbon Mapping Experiment, we find that masking out the “voxels” (spectral–spatial elements) containing foreground galaxies identified using an optimized CO flux threshold results in a z-dependent criterion m K AB ≲ 22 (or M * ≳ 10 9 M ⊙ ) at z < 1 and makes a [C ii]/COtot power ratio of ≳10 at k = 0.1 h/Mpc achievable, at the cost of a moderate ≲8% loss of total survey volume.
哈勃超深场中的 ALMA 光谱测量：对毫米波长谱线强度映射和 CMB 光谱畸变的影响
DOI：
10.3847/1538-4357/833/1/73
发表时间：
2016
期刊：
The Astrophysical Journal
影响因子：
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作者：
Carilli, C. L.;Chluba, J.;Decarli, R.;Walter, F.;Aravena, M.;Wagg, J.;Popping, G.;Cortes, P.;Hodge, J.;Weiss, A.
通讯作者：
Weiss, A.