The most distant, luminous, dusty star-forming galaxies: redshifts from NOEMA and ALMA spectral scans
The most distant, luminous, dusty star-forming galaxies: redshifts from NOEMA and ALMA spectral scans
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DOI：
10.1093/mnras/stx1956
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发表时间：
2017-07
影响因子：
4.8
通讯作者：
Y. Fudamoto;R. Ivison;I. Oteo;M. Krips;Z. Zhang;A. Weiss;H. Dannerbauer;A. Omont;S. Chapman;L. Christensen;V. Arumugam;F. Bertoldi;M. Bremer;D. Clements;L. Dunne;S. Eales;J. Greenslade;S. Maddox;P. Mart́ınez-Navajas;M. Michałowski;I. P'erez-Fournon;D. Riechers;J. Simpson;B. Stalder;E. Valiante;P. Werf
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作者：
Y. Fudamoto;R. Ivison;I. Oteo;M. Krips;Z. Zhang;A. Weiss;H. Dannerbauer;A. Omont;S. Chapman;L. Christensen;V. Arumugam;F. Bertoldi;M. Bremer;D. Clements;L. Dunne;S. Eales;J. Greenslade;S. Maddox;P. Mart́ınez-Navajas;M. Michałowski;I. P'erez-Fournon;D. Riechers;J. Simpson;B. Stalder;E. Valiante;P. Werf
我们展示了使用 NOEMA 和 ALMA 获得的 21 个遥远的尘埃恒星形成星系 (DSFG) 的 1.3 毫米和/或 3 毫米连续谱图像和 3 毫米光谱扫描。我们的样本是 Ivison 等人选择的星系的子集。 (2016) 基于其极红的远红外 (far-IR) 颜色和低赫歇尔通量密度；因此，大多数预计将是 z ≳ 4 处的无透镜、异常明亮的星暴，以它们的红移所暗示的引力透镜效应的相当大的横截面为模。我们通过 3 毫米大气窗口扫描，用 NOEMA 观测到了其中 17 个星系，用 ALMA 观测到了 4 个星系。我们通过检测多条 CO 谱线获得了 7 个星系的可靠红移，其中一个是 z = 6.027 的透镜系统（另外两个也被发现是透镜系统）；在另外四个星系中检测到一条单一的发射线，其中一个已在其他地方显示位于 z = 4.002 处。在我们没有发现光谱红移的地方，星系的亮度通常会降低 0.3-0.4 dex，这在一定程度上解释了我们未能检测到线发射的原因。我们证明该样本包含已知最明亮的恒星形成星系之一。由于其极端的恒星形成活动，这些星系将在 ≲ 100 Myr 的时间内消耗掉它们的分子气体，尽管它们的分子气体质量很高，因此它们可能是 z ≈ 3 处巨大的“红死”椭圆星系的祖先。
We present 1.3- and/or 3-mm continuum images and 3-mm spectral scans, obtained using NOEMA and ALMA, of 21 distant, dusty, star-forming galaxies (DSFGs). Our sample is a subset of the galaxies selected by Ivison et al. (2016) on the basis of their extremely red far-infrared (far-IR) colours and low Herschel flux densities; most are thus expected to be unlensed, extraordinarily luminous starbursts at z ≳ 4, modulo the considerable cross-section to gravitational lensing implied by their redshift. We observed 17 of these galaxies with NOEMA and four with ALMA, scanning through the 3-mm atmospheric window. We have obtained secure redshifts for seven galaxies via detection of multiple CO lines, one of them a lensed system at z = 6.027 (two others are also found to be lensed); a single emission line was detected in another four galaxies, one of which has been shown elsewhere to lie at z = 4.002. Where we find no spectroscopic redshifts, the galaxies are generally less luminous by 0.3–0.4 dex, which goes some way to explaining our failure to detect line emission. We show that this sample contains amongst the most luminous known star-forming galaxies. Due to their extreme star-formation activity, these galaxies will consume their molecular gas in ≲ 100 Myr, despite their high molecular gas masses, and are therefore plausible progenitors of the massive, ‘red-and-dead’ elliptical galaxies at z ≈ 3.