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arXiv 1809.01142astro-ph.GA
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M $_{\mathrm{UV}}\sim$ -15超微弱发射线镓的MUSE光谱鉴定

MUSE Spectroscopic Identifications of Ultra-Faint Emission Line Galaxies with M$_{\mathrm{UV}}\sim$ -15

Michael V. Maseda, Roland Bacon, Marijn Franx, Jarle Brinchmann, Joop Schaye, Leindert A. Boogaard, Nicolas Bouche, Rychard J. Bouwens, Sebastiano Cantalupo, Th… 展开作者

Michael V. Maseda, Roland Bacon, Marijn Franx, Jarle Brinchmann, Joop Schaye, Leindert A. Boogaard, Nicolas Bouche, Rychard J. Bouwens, Sebastiano Cantalupo, Thierry Contini, Takuya Hashimoto, Hanae Inami, Raffaella A. Marino, Sowgat Muzahid, Themiya Nanayakkara, Johan Richard, Kasper B. Schmidt, Anne Verhamme, Lutz Wisotzki

摘要:

使用ESO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:观测到的星等m > 30 - 32的星系。具体来说,我们通过莱曼α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(哈勃超深场)覆盖的区域中没有单独的连续对应物。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莱曼α发射以及1216埃突变和微弱的紫外连续谱(M_UV ~ -15)。这使它们成为在这些红移中光谱学证实的最微弱的物体,类似于被认为是宇宙的来源。一个简单的模型的预期部分检测到/未检测到的莱曼α发射体作为光度的函数是一致的,这些对象是正常的莱曼α发射体人口在这些红移的高等效宽度的尾巴。

英文摘要:

Using an ultra-deep blind survey with the MUSE integral field spectrograph on the ESO Very Large Telescope, we obtain spectroscopic redshifts to a depth never explored before: galaxies with observed magnitudes m > 30 - 32. Specifically, we detect objects via Lyman-alpha 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 Lyman-alpha emission as well as the 1216 Angstrom-breaks and faint UV continua (M_UV ~ -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 Lyman-alpha emitters as a function of luminosity is consistent with these objects being the high-equivalent width tail of the normal Lyman-alpha-emitter population at these redshifts.

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