MUSE Spectroscopic Identifications of Ultra-faint Emission Line Galaxies with MUV ∼ −15
MUSE Spectroscopic Identifications of Ultra-faint Emission Line Galaxies with MUV ∼ −15
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DOI：
10.3847/2041-8213/aade4b
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发表时间：
2018-09
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通讯作者：
M. Maseda;R. Bacon;M. Franx;J. Brinchmann;J. Schaye;L. Boogaard;N. Bouché;R. Bouwens;S. Cantalupo;T. Contini;T. Hashimoto;H. Inami;R. Marino;S. Muzahid;T. Nanayakkara;J. Richard;K. Schmidt;A. Verhamme;L. Wisotzki
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作者：
M. Maseda;R. Bacon;M. Franx;J. Brinchmann;J. Schaye;L. Boogaard;N. Bouché;R. Bouwens;S. Cantalupo;T. Contini;T. Hashimoto;H. Inami;R. Marino;S. Muzahid;T. Nanayakkara;J. Richard;K. Schmidt;A. Verhamme;L. Wisotzki
使用欧洲南方天文台甚大望远镜上的MUSE积分场摄谱仪进行超深盲测，我们获得了以前从未探索过的光谱红移深度：观测到的星系星等为mAB 30-32。具体来说，我们通过Lyα发射在2.9 < z < 6.7处检测物体，而在哈勃太空望远镜拍摄的最深光学/近红外成像所覆盖的区域中没有单独的连续对应物，哈勃超深场。在这些红移中，我们总共在9平方角分内发现了102个这样的天体。详细的叠加分析证实了Lyα发射以及1216个λ的破裂和微弱的紫外连续谱（MUV λ −15）。这使它们成为在这些红移下光谱确认的最微弱的物体，类似于被认为是宇宙的来源。一个简单的模型可以预测被探测到的和未被探测到的Lyα发射体的比例与光度的关系，这个模型与这些天体是正常Lyα发射体在这些红移处的高等效宽度尾部相一致。
Using an ultra-deep blind survey with the MUSE integral field spectrograph on the European Southern Observatory Very Large Telescope, we obtain spectroscopic redshifts to a depth never before explored: galaxies with observed magnitudes mAB ≳ 30–32. Specifically, we detect objects via Lyα emission at 2.9 < z < 6.7 without individual continuum counterparts in areas covered by the deepest optical/near-infrared imaging taken by the Hubble Space Telescope, the Hubble Ultra Deep Field. In total, we find 102 such objects in 9 square arcminutes at these redshifts. Detailed stacking analyses confirm the Lyα emission as well as the 1216 Å breaks and faint ultraviolet continua (MUV ∼ −15). This makes them the faintest spectroscopically confirmed objects at these redshifts, similar to the sources believed to reionize the universe. A simple model for the expected fraction of detected/undetected Lyα emitters as a function of luminosity is consistent with these objects being the high-equivalent width tail of the normal Lyα-emitter population at these redshifts.