The DEIMOS 10K Spectroscopic Survey Catalog of the COSMOS Field
The DEIMOS 10K Spectroscopic Survey Catalog of the COSMOS Field
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DOI：
10.3847/1538-4357/aabacf
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发表时间：
2018-03
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通讯作者：
G. Hasinger;P. Capak;M. Salvato;A. Barger;L. Cowie;A. Faisst;S. Hemmati;Y. Kakazu;J. Kartaltepe;D. Masters;B. Mobasher;H. Nayyeri;D. Sanders;N. Scoville;H. Suh;C. Steinhardt;F. Yang
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作者：
G. Hasinger;P. Capak;M. Salvato;A. Barger;L. Cowie;A. Faisst;S. Hemmati;Y. Kakazu;J. Kartaltepe;D. Masters;B. Mobasher;H. Nayyeri;D. Sanders;N. Scoville;H. Suh;C. Steinhardt;F. Yang
我们提出了一份宇宙领域10,718个天体的目录，这些天体是通过Keck II望远镜上的深度成像多目标光谱仪（DEIMOS）在波长范围~ 5500-9800 Å上通过多缝光谱观测到的。该星表包含6617个具有高质量光谱（两个或更多光谱特征）的天体，1798个具有通过光度红移确认的单一光谱特征的天体。对于2024年典型的微弱天体，我们无法获得可靠的红移。这些天体是从基于多波长观测的各种输入星表中选择出来的，因此具有多样化的选择功能，这使得研究星系群的多样性成为可能。我们的天体的星等分布在IAB ~ 23和KAB ~ 21处达到峰值，在KAB ~ 24处有第二个峰值。我们在0.65范围内采样一个广泛的红移分布，概率为10mpc。与同一领域的众多其他光谱样品进行的对象对对象比较表明，我们的DEIMOS样品在光谱失效的比例和相对红移精度方面是最好的。我们测定了样品中光谱混合物的比例约为0.8%。这可能是一个下限，无论如何都远低于最悲观的预期。有趣的是，我们在12个目标星系的狭缝中发现了Lyα背景发射器的强透镜效应的证据，使它们的表观密度增加了大约4倍。
We present a catalog of 10,718 objects in the COSMOS field, observed through multi-slit spectroscopy with the Deep Imaging Multi-Object Spectrograph (DEIMOS) on the Keck II telescope in the wavelength range ∼5500–9800 Å. The catalog contains 6617 objects with high-quality spectra (two or more spectral features), and 1798 objects with a single spectroscopic feature confirmed by the photometric redshift. For 2024 typically faint objects, we could not obtain reliable redshifts. The objects have been selected from a variety of input catalogs based on multi-wavelength observations in the field, and thus have a diverse selection function, which enables the study of the diversity in the galaxy population. The magnitude distribution of our objects is peaked at IAB ∼ 23 and KAB ∼ 21, with a secondary peak at KAB ∼ 24. We sample a broad redshift distribution in the range 0 0.65 with chance probabilities 10 Mpc. An object-to-object comparison with a multitude of other spectroscopic samples in the same field shows that our DEIMOS sample is among the best in terms of fraction of spectroscopic failures and relative redshift accuracy. We have determined the fraction of spectroscopic blends to about 0.8% in our sample. This is likely a lower limit and at any rate well below the most pessimistic expectations. Interestingly, we find evidence for strong lensing of Lyα background emitters within the slits of 12 of our target galaxies, increasing their apparent density by about a factor of 4.