Planck's dusty GEMS: The brightest gravitationally lensed galaxies discovered with the Planck all-sky survey
Planck's dusty GEMS: The brightest gravitationally lensed galaxies discovered with the Planck all-sky survey
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DOI：
10.1051/0004-6361/201425128
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发表时间：
2015-09-01
影响因子：
6.5
通讯作者：
Yan, L.
中科院分区：
文献类型：
--
作者：
Canameras, R.;Nesvadba, N. P. H.;Yan, L.
我们提出了一个分析的CO光谱和红外到毫米尘埃测光的11个非常明亮的远红外（FIR）和亚毫米源发现，通过结合普朗克全天空调查和后续赫歇尔-SPIRE成像-“普朗克的尘埃引力增强亚毫米源”。每个源都有一个安全的光谱红移z = 2.2-3.6从多条线通过盲红移搜索与EMIR在IRAM 30米望远镜。在IRAM和SMA获得了干涉测量，并且沿着在CFHT和VLT获得的光学/近红外成像揭示了与强引力透镜源一致的形态，包括几个巨大的弧。用JCMT/SCUBA-2和IRAM/GISMO分别在850 μ m和2 mm处获得额外的光度测定。我们的源的SEDs峰值附近的350 μ m或500 μ m带的SPIRE与峰值通量密度之间的0.35和1.14焦耳。在250 μ m的18“SPIRE光束中，所有物体都是非常明亮的孤立点源，其明显的FIR光度高达3 x 10（14）L圆点（不校正透镜效应）。它们的形态、大小、CO线宽、CO光度、尘埃温度和远红外光度提供了额外的经验证据，证明它们是亚毫米天空中最明亮的强引力透镜高红移星系。我们的计划将对强引力透镜高红移星系的成功广域搜索（用南极望远镜和赫歇尔进行）扩展到更亮的光源，这些光源非常罕见，以至于它们的系统识别需要像普朗克那样的真正的全天巡天。六个源高于普朗克紧凑源目录（PCCS）在545和857 GHz的类似或等于600 mJy 90%的完整性限制，这意味着这些必须是河外天空中最明亮的高红移FIR和亚毫米源。我们讨论了它们的尘埃质量和温度，并使用额外的WISE 22-μ m测光和模板拟合，以排除活动星系核加热的总红外光度的显着贡献。FIRST在1.4GHz处检测到6个源，其他源具有敏感上限。四个的流量密度比预期的本地FIR无线电相关，但在以前发现的高Z亚毫米星系的范围内，有一个赤字的FIR发射，和6是符合本地相关性，虽然这包括3个星系上限。我们把这归因于这些星系的湍流星际介质，而不是无线电活动星系核的存在。我们的来源的全球尘埃气体比和恒星形成效率主要在大规模，富含金属，强烈，高红移恒星爆发的预期范围内。目前正在进行一项广泛的多波长后续方案，以进一步确定这些光源及其内部密集星星形成的特征。
We present an analysis of CO spectroscopy and infrared-to-millimetre dust photometry of 11 exceptionally bright far-infrared (FIR) and sub-mm sources discovered through a combination of the Planck all-sky survey and follow-up Herschel-SPIRE imaging -"Planck's Dusty Gravitationally Enhanced subMillimetre Sources". Each source has a secure spectroscopic redshift z = 2.2-3.6 from multiple lines obtained through a blind redshift search with EMIR at the IRAM 30-m telescope. Interferometry was obtained at IRAM and the SMA, and along with optical/near-infrared imaging obtained at the CFHT and the VLT reveal morphologies consistent with strongly gravitationally lensed sources, including several giant arcs. Additional photometry was obtained with JCMT/SCUBA-2 and IRAM/GISMO at 850 mu m and 2 mm, respectively. The SEDs of our sources peak near either the 350 mu m or 500 mu m bands of SPIRE with peak flux densities between 0.35 and 1.14 Jy. All objects are extremely bright isolated point sources in the 18 '' beam of SPIRE at 250 mu m, with apparent FIR luminosities of up to 3 x 10(14) L-circle dot (not correcting for the lensing effect). Their morphologies, sizes, CO line widths, CO luminosities, dust temperatures, and FIR luminosities provide additional empirical evidence that these are amongst the brightest strongly gravitationally lensed high-redshift galaxies on the sub-mm sky. Our programme extends the successful wide-area searches for strongly gravitationally lensed high-redshift galaxies (carried out with the South Pole Telescope and Herschel) towards even brighter sources, which are so rare that their systematic identification requires a genuine all-sky survey like Planck. Six sources are above the similar or equal to 600 mJy 90% completeness limit of the Planck catalogue of compact sources (PCCS) at 545 and 857 GHz, which implies that these must literally be amongst the brightest high-redshift FIR and sub-mm sources on the extragalactic sky. We discuss their dust masses and temperatures, and use additional WISE 22-mu m photometry and template fitting to rule out a significant contribution of AGN heating to the total infrared luminosity. Six sources are detected in FIRST at 1.4 GHz, and the others have sensitive upper limits. Four have flux densities brighter than expected from the local FIR-radio correlation, but in the range previously found for high-z sub-mm galaxies, one has a deficit of FIR emission, and 6 are consistent with the local correlation, although this includes 3 galaxies with upper limits. We attribute this to the turbulent interstellar medium of these galaxies, rather than the presence of radio AGN. The global dust-to-gas ratios and star-formation efficiencies of our sources are predominantly in the range expected from massive, metal-rich, intense, high-redshift starbursts. An extensive multi-wavelength follow-up programme is being carried out to further characterize these sources and the intense star formation within them.