Probing Intra-Halo Light with Galaxy Stacking in CIBER Images
Probing Intra-Halo Light with Galaxy Stacking in CIBER Images
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DOI：
10.3847/1538-4357/ac0f5b
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发表时间：
2021-03
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影响因子：
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通讯作者：
Yun-Ting Cheng;T. Arai;P. Bangale;J. Bock;Tzu-Ching Chang;A. Cooray;R. Feder;P. Korngut;
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作者：
Yun-Ting Cheng;T. Arai;P. Bangale;J. Bock;Tzu-Ching Chang;A. Cooray;R. Feder;P. Korngut;
我们利用宇宙红外背景实验（CIBER）的成像数据研究了恒星质量从M *<$1010.5到1012 M <$1010.5的0.2 × z <$0.5星系的恒星晕（在此红移处约为L * 星系）。先前的CIBER波动分析表明，内晕光（IHL）贡献了近红外河外背景光（EBL）的重要部分，EBL是整个宇宙历史中所有来源的综合发射。在这项工作中，我们进行了堆叠分析与样本的30，000斯隆数字巡天（SDSS）光度星系从CIBER图像在两个近红外波段（1.1和1.8 μm），以直接探测IHL与这些星系。我们堆叠星系在五个子样本分裂的亮度和检测扩展的星系轮廓超出仪器点扩散函数（PSF）堆叠恒星。我们共同适合的固有的星系光剖面加上大规模的一个和两个晕聚类模型来测量扩展的星系IHL。我们在1.8 μm波段检测到非线性单晕簇，其水平与数值模拟一致。通过外推我们测量到的所有星系质量尺度的扩展星系光的比例，我们发现来自星系的总星系光预算的15%/30%分别位于半径r > 10/20 kpc处。这些结果是新的在近红外波长在L * 质量尺度，并表明，IHL发射和一个晕集群可能有可观的贡献大规模EBL背景波动的幅度。
We study the stellar halos of 0.2 ≲ z ≲ 0.5 galaxies with stellar masses spanning M * ∼ 1010.5 to 1012 M ⊙ (approximately L * galaxies at this redshift) using imaging data from the Cosmic Infrared Background Experiment (CIBER). A previous CIBER fluctuation analysis suggested that intra-halo light (IHL) contributes a significant portion of the near-infrared extragalactic background light (EBL), the integrated emission from all sources throughout cosmic history. In this work, we carry out a stacking analysis with a sample of ∼30,000 Sloan Digital Sky Survey (SDSS) photometric galaxies from CIBER images in two near-infrared bands (1.1 and 1.8 μm) to directly probe the IHL associated with these galaxies. We stack galaxies in five sub-samples split by brightness and detect an extended galaxy profile beyond the instrument point-spread function (PSF) derived by stacking stars. We jointly fit a model for the inherent galaxy light profile plus large-scale one- and two-halo clustering to measure the extended galaxy IHL. We detect nonlinear one-halo clustering in the 1.8 μm band at a level consistent with numerical simulations. By extrapolating the fraction of extended galaxy light we measure to all galaxy mass scales, we find ∼30%/15% of the total galaxy light budget from galaxies is at radius r > 10/20 kpc, respectively. These results are new at near-infrared wavelengths at the L * mass scale and suggest that the IHL emission and one-halo clustering could have appreciable contributions to the amplitude of large-scale EBL background fluctuations.