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arXiv 1108.0669astro-ph.CO
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2 MASS红移巡天-描述和数据发布

The 2MASS Redshift Survey - Description and Data Release

John P. Huchra, Lucas M. Macri, Karen L. Masters, Thomas H. Jarrett, Perry Berlind, Michael Calkins, Aidan C. Crook, Roc Cutri, Pirin Erdogdu, Emilio Falco, Ted… 展开作者

John P. Huchra, Lucas M. Macri, Karen L. Masters, Thomas H. Jarrett, Perry Berlind, Michael Calkins, Aidan C. Crook, Roc Cutri, Pirin Erdogdu, Emilio Falco, Teddy George, Conrad M. Hutcheson, Ofer Lahav, Jeff Mader, Jessica D. Mink, Nathalie Martimbeau, Stephen Schneider, Michael Skrutskie, Susan Tokarz, Michael Westover

摘要:

我们介绍了2 MASS红移巡天(2 MRS)的结果,这是一个为期十年的项目,旨在绘制附近宇宙中星系的完整三维分布。2微米全天巡天计划(2 MASS)于2003年完成,其最终数据产品,包括扩展源目录(XSC),可在线获得。2 MASS XSC包含近一百万个Ks <= 13.5等的星系,基本上是完整的,并且大部分不受星际灭绝和恒星混淆的影响,对于明亮的星系来说,银河系纬度为|b| =5度。近红外波长对主导星系质量的古老恒星星族很敏感,这使得2 MASS成为研究附近宇宙物质分布的绝佳起点。我们选择了44,599个Ks <= 11.75等和|b| >=5度(朝向银河系凸起>= 8度)的2质量星系作为我们调查的输入目录。我们获得了11,000个星系的光谱观测结果,并使用先前获得的样本其余部分的速度来生成一个红移目录,该目录在明确定义的范围内完成了97.6%,覆盖了91%的天空。这提供了一个前所未有的普查星系(重子质量)浓度在300 Mpc。我们巡天的早期版本已被用于许多出版物中,这些出版物研究了本星系群的整体运动,绘制了50 Mpc的密度和特殊速度场,检测了星系群,并估计了几个宇宙学参数的值。此外,我们提出了一个几乎完整的子样本20,860星系Ks < 11.25 mag and |b| >= 10度的形态类型。

英文摘要:

We present the results of the 2MASS Redshift Survey (2MRS), a ten-year project to map the full three-dimensional distribution of galaxies in the nearby Universe. The 2 Micron All-Sky Survey (2MASS) was completed in 2003 and its final data products, including an extended source catalog (XSC), are available on-line. The 2MASS XSC contains nearly a million galaxies with Ks <= 13.5 mag and is essentially complete and mostly unaffected by interstellar extinction and stellar confusion down to a galactic latitude of |b|=5 deg for bright galaxies. Near-infrared wavelengths are sensitive to the old stellar populations that dominate galaxy masses, making 2MASS an excellent starting point to study the distribution of matter in the nearby Universe. We selected a sample of 44,599 2MASS galaxies with Ks <= 11.75 mag and |b|>=5 deg (>= 8 deg towards the Galactic bulge) as the input catalog for our survey. We obtained spectroscopic observations for 11,000 galaxies and used previously-obtained velocities for the remainder of the sample to generate a redshift catalog that is 97.6% complete to well-defined limits and covers 91% of the sky. This provides an unprecedented census of galaxy (baryonic mass) concentrations within 300 Mpc. Earlier versions of our survey have been used in a number of publications that have studied the bulk motion of the Local Group, mapped the density and peculiar velocity fields out to 50 Mpc, detected galaxy groups, and estimated the values of several cosmological parameters. Additionally, we present morphological types for a nearly-complete sub-sample of 20,860 galaxies with Ks < 11.25 mag and |b|>= 10 deg.

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