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arXiv 1409.0447astro-ph.GA
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FMOS-COSMOS对z~1.6恒星形成星系的巡天III。调查设计、执行和样本特征

The FMOS-COSMOS survey of star-forming galaxies at z~1.6 III. Survey design, performance, and sample characteristics

J. D. Silverman, D. Kashino, D. Sanders, J. Kartaltepe, N. Arimoto, A. Renzini, G. Rodighiero, E. Daddi, J. Zahid, T. Nagao, L. J. Kewley, S. J. Lilly, N. Sugiy… 展开作者

J. D. Silverman, D. Kashino, D. Sanders, J. Kartaltepe, N. Arimoto, A. Renzini, G. Rodighiero, E. Daddi, J. Zahid, T. Nagao, L. J. Kewley, S. J. Lilly, N. Sugiyama, I. Baronchelli, P. Capak, C. M. Carollo, J. Chu, G. Hasinger, O. Ilbert, S. Juneau, M. Kajisawa, A. M. Koekemoer, K. Kovac, O. Le Fevre, D. Masters, H. J. McCracken, M. Onodera, N. Scoville, V. Strazzullo, Y. Taniguchi

摘要:

我们提出了一个光谱调查的星系在宇宙领域使用光纤多目标光谱仪(FMOS),近红外仪器的斯巴鲁望远镜。我们的调查是专门设计来检测H波段(1.6-1.8 μ m)光谱窗口内的H α发射线,该光谱窗口来自1.4 &lt; z < 1.7 and M_stellar>~10^10 M太阳系的恒星形成星系。随着FMOS的高复用能力,现在可以构建超过一千个星系的样本,这些星系在以前具有挑战性的时代具有光谱红移。高分辨率模式(R~2600)有效地分离了Halpha和[NII]6585,从而能够研究星际介质的气相金属性和光电离态。我们计划的主要目的是确定恒星形成如何取决于恒星质量和环境,两者都被认为是较低红移星系演化的驱动因素。除了主要的星系样本外,我们的目标选择优先考虑Herschel/PACS在远红外线中检测到的样本,以评估模糊的恒星形成水平,并详细调查恒星形成率-恒星质量关系的异常值。在探测到Halpha的银河系之后,在较短的波长上使用J长(1.11-1.35微米)光栅进行FMOS观测,以探测Hbeta和[OIII]5008,它提供了测量恒星形成率所需的消光评估,而不受尘埃的阻碍,并指示嵌入的活动银河核。从1153光谱测量460红移,我们评估仪器的性能,以实现我们的目标,讨论固有的偏差在样品中,并详细的发射线的属性。我们的更高级别的数据产品,包括目录和光谱,可供社区使用。

英文摘要:

We present a spectroscopic survey of galaxies in the COSMOS field using the Fiber Multi-Object Spectrograph (FMOS), a near-infrared instrument on the Subaru Telescope. Our survey is specifically designed to detect the Halpha emission line that falls within the H-band (1.6-1.8 um) spectroscopic window from star-forming galaxies with 1.4 < z < 1.7 and M_stellar>~10^10 Msolar. With the high multiplex capability of FMOS, it is now feasible to construct samples of over one thousand galaxies having spectroscopic redshifts at epochs that were previously challenging. The high-resolution mode (R~2600) effectively separates Halpha and [NII]6585 thus enabling studies of the gas-phase metallicity and photoionization state of the interstellar medium. The primary aim of our program is to establish how star formation depends on stellar mass and environment, both recognized as drivers of galaxy evolution at lower redshifts. In addition to the main galaxy sample, our target selection places priority on those detected in the far-infrared by Herschel/PACS to assess the level of obscured star formation and investigate, in detail, outliers from the star formation rate - stellar mass relation. Galaxies with Halpha detections are followed up with FMOS observations at shorter wavelengths using the J-long (1.11-1.35 um) grating to detect Hbeta and [OIII]5008 that provides an assessment of extinction required to measure star formation rates not hampered by dust, and an indication of embedded Active Galactic Nuclei. With 460 redshifts measured from 1153 spectra, we assess the performance of the instrument with respect to achieving our goals, discuss inherent biases in the sample, and detail the emission-line properties. Our higher-level data products, including catalogs and spectra, are available to the community.

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