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arXiv 2301.02584astro-ph.GA
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明亮河外ALMA巡天(BEARS)II:引力透镜候选体的毫米波测光

The Bright Extragalactic ALMA Redshift Survey (BEARS) II: Millimetre photometry of gravitational lens candidates

G. J. Bendo, S. A. Urquhart, S. Serjeant, T. Bakx, M. Hagimoto, P. Cox, R. Neri, M. D. Lehnert, H. Dannerbauer, A. Amvrosiadis, P. Andreani, A. J. Baker, A. Bee… 展开作者

G. J. Bendo, S. A. Urquhart, S. Serjeant, T. Bakx, M. Hagimoto, P. Cox, R. Neri, M. D. Lehnert, H. Dannerbauer, A. Amvrosiadis, P. Andreani, A. J. Baker, A. Beelen, S. Berta, E. Borsato, V. Buat, K. M. Butler, A. Cooray, G. De Zotti, L. Dunne, S. Dye, S. Eales, A. Enia, L. Fan, R. Gavazzi, J. González-Nuevo, A. I. Harris, C. N. Herrera, D. H. Hughes, D. Ismail, B. M. Jones, K. Kohno, M. Krips, G. Lagache, L. Marchetti, M. Massardi, H. Messias, M. Negrello, A. Omont, I. Pérez-Fournon, D. A. Riechers, D. Scott, M. W. L. Smith, F. Stanley, Y. Tamura, P. Temi, P. van der Werf, A. Verma, C. Vlahakis, A. Weiß, C. Yang, A. J. Young

AI总结:

本文利用ALMA毫米波观测研究Herschel选源的引力透镜候选体,发现多数亮源对应单个ALMA源,且毫米波数据能显著提高光度红移估算精度。

摘要:

我们展示了101和151 GHz的ALMA连续谱图像,这些图像覆盖了从Herschel观测中选出的85个天区,这些天区的500微米流量密度大于80毫央斯基(mJy),且250-500微米颜色与红移z > 2一致,其中大部分预计是引力透镜星系或超亮红外星系。Herschel 500微米源中约有一半被分解为多个ALMA源,但15个最亮的500微米Herschel源中有11个对应于单个ALMA源。对于包含单个具有光谱红移的源或两个具有相同光谱红移的源的37个天区,我们检查了颜色温度和尘埃发射率指数。颜色温度仅随红移微弱变化,并且在统计上与无红移依赖的温度变化一致,这通常与在远红外、亚毫米或毫米波段选择的其他样本的结果一致,但与在光学或近红外波段选择的样本结果不一致。尘埃发射率指数,除极少数例外,基本与值2一致。我们还将光谱红移与基于为红外明亮高红移星系设计的光谱能量分布模板的光度红移进行了比较。虽然模板系统性地将红移低估约15%,但加入ALMA数据使预测红移的离散度降低了约2倍,这说明了这些毫米波数据在估算光度红移方面的潜在用途。

英文摘要:

We present 101 and 151 GHz ALMA continuum images for 85 fields selected from Herschel observations that have 500 micron flux densities >80 mJy and 250-500 micron colours consistent with z > 2, most of which are expected to be gravitationally lensed or hyperluminous infrared galaxies. Approximately half of the Herschel 500 micron sources were resolved into multiple ALMA sources, but 11 of the 15 brightest 500 micron Herschel sources correspond to individual ALMA sources. For the 37 fields containing either a single source with a spectroscopic redshift or two sources with the same spectroscopic redshift, we examined the colour temperatures and dust emissivity indices. The colour temperatures only vary weakly with redshift and are statistically consistent with no redshift-dependent temperature variations, which generally corresponds to results from other samples selected in far-infrared, submillimetre, or millimetre bands but not to results from samples selected in optical or near-infrared bands. The dust emissivity indices, with very few exceptions, are largely consistent with a value of 2. We also compared spectroscopic redshifts to photometric redshifts based on spectral energy distribution templates designed for infrared-bright high-redshift galaxies. While the templates systematically underestimate the redshifts by ~15%, the inclusion of ALMA data decreases the scatter in the predicted redshifts by a factor of ~2, illustrating the potential usefulness of these millimetre data for estimating photometric redshifts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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