BLAST: THE REDSHIFT SURVEY
BLAST: THE REDSHIFT SURVEY
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爆炸：红移调查
DOI：
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发表时间：
2009
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通讯作者：
M. Viero
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文献类型：
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作者：
S. Eales;E. Chapin;M. Devlin;S. Dye;M. Halpern;D. Hughes;G. Marsden;P. Mauskopf;L. Moncelsi;C. Netterfield;E. Pascale;G. Patanchon;G. Raymond;M. Rex;D. Scott;C. Semisch;B. Siana;M. Truch;M. Viero
气球搭载的大口径亚毫米望远镜(BLAST)最近以大观测站为中心，在250、350和500μm的南方原点深度探测到了8.7°2。在Dye等人中，我们给出了在该领域至少一个波段在5σ探测到的源的目录，以及在其他波段可能与这些源对应的源。在本文中，我们给出了一次红移测量的结果，在该测量中，我们成功地测量了其中82个对应物的红移。光谱显示，与斯隆数字巡天中发现的星系相比，BLAST对应的星系大多是恒星形成星系，但并不极端。大约四分之一的爆炸对应物包含一个活跃的原子核。我们利用光谱红移对光度红移方法估计尘埃星系红移的能力进行了测试，结果表明，即使在星系包含大量尘埃的情况下，标准方法也能很好地工作。我们还调查了两个可能与爆炸源对应的情况，发现在其中至少一半的情况下，有证据表明这两个星系在物理上是相关的，要么是因为它们相互作用，要么是因为它们处于同一大尺度结构中。最后，我们首次直接测量了三个爆炸带的光度函数。我们发现z=1有很强的演化，在这个意义上，最明亮的星系的空间密度有了很大的增加。我们还研究了尘埃质量函数的演化，发现具有最大尘埃质量的星系的空间密度也有类似的强烈演化，表明在许多波段看到的光度演化与星系中星际物质储存库的增加有关。
The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) has recently surveyed ≃8.7 deg2 centered on Great Observatories Origins Deep Survey-South at 250, 350, and 500 μm. In Dye et al., we presented the catalog of sources detected at 5σ in at least one band in this field and the probable counterparts to these sources in other wavebands. In this paper, we present the results of a redshift survey in which we succeeded in measuring redshifts for 82 of these counterparts. The spectra show that the BLAST counterparts are mostly star-forming galaxies but not extreme ones when compared to those found in the Sloan Digital Sky Survey. Roughly one quarter of the BLAST counterparts contain an active nucleus. We have used the spectroscopic redshifts to carry out a test of the ability of photometric redshift methods to estimate the redshifts of dusty galaxies, showing that the standard methods work well even when a galaxy contains a large amount of dust. We have also investigated the cases where there are two possible counterparts to the BLAST source, finding that in at least half of these there is evidence that the two galaxies are physically associated, either because they are interacting or because they are in the same large-scale structure. Finally, we have made the first direct measurements of the luminosity function in the three BLAST bands. We find strong evolution out to z = 1, in the sense that there is a large increase in the space density of the most luminous galaxies. We have also investigated the evolution of the dust-mass function, finding similar strong evolution in the space density of the galaxies with the largest dust masses, showing that the luminosity evolution seen in many wavebands is associated with an increase in the reservoir of interstellar matter in galaxies.