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arXiv 1011.0691astro-ph.GA
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Bolocam银道巡天:巡天描述和数据处理

The Bolocam Galactic Plane Survey: Survey Description and Data Reduction

James E. Aguirre, Adam G. Ginsburg, Miranda K. Dunham, Meredith M. Drosback, John Bally, Cara Battersby, Eric Todd Bradley, Claudia Cyganowski, Darren Dowell, N… 展开作者

James E. Aguirre, Adam G. Ginsburg, Miranda K. Dunham, Meredith M. Drosback, John Bally, Cara Battersby, Eric Todd Bradley, Claudia Cyganowski, Darren Dowell, Neal J. Evans, Jason Glenn, Paul Harvey, Erik Rosolowsky, Guy S. Stringfellow, Josh Walawender, Jonathan P. Williams

摘要:

我们提出了Bolocam银河平面调查(BGPS),一个1.1毫米的连续调查,在33”有效分辨率的170平方度的银河平面可见从北半球。该测量在-10.5 <1 < 90.5,|b| < 0.5的范围内是连续的,并且包括133平方度,包括一些扩展区域|b| < 1.5。除了邻近的区域外,还观察到外星系中的四个目标区域:IC 1396,靠近英仙座臂的区域,W3/4/5和Gem OB 1。BGPS在整个区域内探测到了大约8400个团块,在银河系内部的11至53 mJy/束的范围内限制了非均匀的1-sigma噪声水平。BGPS源目录在配套论文中介绍(Rosolowsky等人,2010年)。本文详细介绍了遥感影像的调查观测和数据处理方法。我们详细讨论了天体测量和通量密度校准不确定度的确定,并将我们的结果与文献进行了比较。提出了在数据时间流中将天文信号与时变大气波动分离的数据处理算法。这些算法在有限的角度尺度范围内再现了天文天空的结构,并在明亮的光源附近产生伪影。基于模拟,我们发现在大于约5.9'的尺度上的扩展发射几乎完全衰减(> 90%),并且衰减达到50%的线性尺度为3.8'。与其他毫米波数据集的比较意味着在通量校准中可能存在系统偏移,但尚未发现原因。本演示文稿作为同伴和指南,通过美国宇航局的红外处理和分析中心(IPAC)红外科学档案(IRSA)的公共数据发布。新的数据发布将通过IPAC IRSA提供,并提供未来在减少方面的任何改进。

英文摘要:

We present the Bolocam Galactic Plane Survey (BGPS), a 1.1 mm continuum survey at 33" effective resolution of 170 square degrees of the Galactic Plane visible from the northern hemisphere. The survey is contiguous over the range -10.5 < l < 90.5, |b| < 0.5 and encompasses 133 square degrees, including some extended regions |b| < 1.5. In addition to the contiguous region, four targeted regions in the outer Galaxy were observed: IC1396, a region towards the Perseus Arm, W3/4/5, and Gem OB1. The BGPS has detected approximately 8400 clumps over the entire area to a limiting non-uniform 1-sigma noise level in the range 11 to 53 mJy/beam in the inner Galaxy. The BGPS source catalog is presented in a companion paper (Rosolowsky et al. 2010). This paper details the survey observations and data reduction methods for the images. We discuss in detail the determination of astrometric and flux density calibration uncertainties and compare our results to the literature. Data processing algorithms that separate astronomical signals from time-variable atmospheric fluctuations in the data time-stream are presented. These algorithms reproduce the structure of the astronomical sky over a limited range of angular scales and produce artifacts in the vicinity of bright sources. Based on simulations, we find that extended emission on scales larger than about 5.9' is nearly completely attenuated (> 90%) and the linear scale at which the attenuation reaches 50% is 3.8'. Comparison with other millimeter-wave data sets implies a possible systematic offset in flux calibration, for which no cause has been discovered. This presentation serves as a companion and guide to the public data release through NASA's Infrared Processing and Analysis Center (IPAC) Infrared Science Archive (IRSA). New data releases will be provided through IPAC IRSA with any future improvements in the reduction.

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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