Subaru/Hyper Suprime-Cam z-Broadband Excess Selection of Extreme Emission Line Galaxies at z < 1
Subaru/Hyper Suprime-Cam z-Broadband Excess Selection of Extreme Emission Line Galaxies at z < 1
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DOI：
10.3847/1538-4357/ac5117
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
B. Rosenwasser;A. Taylor;A. Barger;L. Cowie;E. Hu;L. Jones;A. Songaila
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文献类型：
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作者：
B. Rosenwasser;A. Taylor;A. Barger;L. Cowie;E. Hu;L. Jones;A. Songaila
我们提出了一种在宇宙和北黄道极(NEP)区域的z<；1处的极端发射线星系(EELG)的搜索方法，该方法由Subaru/Hyper SuPrime-Cam(HSC)成像，并结合新的和现有的光谱技术。我们根据z宽带的大量过剩通量来选择eELG，它对0.3≲z≲0.42时的Hλ和0.7≲z≲0.86时的[O III]λ5007敏感。我们在COSMOS数据集中识别了10,470个具有零余辉的星系，在NEP场中识别出91,385个星系。我们将宇宙EELG样本与zCOSMOS和Deimos 10k光谱星表交叉参考，发现了1395个光谱匹配。我们使用WIYN 3.5米望远镜上的HYDRA多目标光谱仪与Y<；23进行了另外71次(46次独特)的光谱测量，并使用Keck II望远镜上的Deimos光谱仪进行了204次光谱测量，为宇宙中的EELG样本提供了总计1441/10,470次光谱红移(∼14%)。我们确认1418(∼98%)是上述红移范围内的Hα或[O III]λ5007发射体。我们还利用WIYN/Hydra和Keck/Deimos获得的光谱识别了NEP中的240个红移Hα和[O III]λ5007发射体。使用g−r−I颜色空间中的宽带选择技术，我们区分Hα和[O III]λ5007发射体的准确率为98.6%。我们通过构造Hα和[O III]λ5007光度函数并与最近的文献结果进行比较来检验我们的脑电地形图选择。我们的结论是，来自HSC、维拉·C·鲁宾天文台和其他深度光学多波段调查的宽带星等可以用一种直接的方式来选择鳗鱼。
We present a search for extreme emission line galaxies (EELGs) at z < 1 in the COSMOS and North Ecliptic Pole (NEP) fields with imaging from Subaru/Hyper Suprime-Cam (HSC) and a combination of new and existing spectroscopy. We select EELGs on the basis of substantial excess flux in the z broad band, which is sensitive to Hα at 0.3 ≲ z ≲ 0.42 and [O iii]λ5007 at 0.7 ≲ z ≲ 0.86. We identify 10,470 galaxies with zexcesses in the COSMOS data set and 91,385 in the NEP field. We cross-reference the COSMOS EELG sample with the zCOSMOS and DEIMOS 10k spectral catalogs, finding 1395 spectroscopic matches. We made an additional 71 (46 unique) spectroscopic measurements with Y < 23 using the HYDRA multiobject spectrograph on the WIYN 3.5 m telescope, and 204 spectroscopic measurements from the DEIMOS spectrograph on the Keck II telescope, providing a total of 1441/10,470 spectroscopic redshifts for the EELG sample in COSMOS (∼14%). We confirm that 1418 (∼98%) are Hα or [O iii]λ5007 emitters in the above stated redshift ranges. We also identify 240 redshifted Hα and [O iii]λ5007 emitters in the NEP using spectra taken with WIYN/HYDRA and Keck/DEIMOS. Using broadband-selection techniques in the g − r − i color space, we distinguish between Hα and [O iii]λ5007 emitters with 98.6% accuracy. We test our EELG selection by constructing Hα and [O iii]λ5007 luminosity functions and comparing to recent literature results. We conclude that broadband magnitudes from HSC, the Vera C. Rubin Observatory, and other deep optical multiband surveys can be used to select EELGs in a straightforward manner.