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arXiv 1101.1879astro-ph.GAastro-ph.IM
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GALFA-HI调查:数据发布1

The GALFA-HI Survey: Data Release 1

J. E. G. Peek, Carl Heiles, Kevin A. Douglas, Min-Young Lee, Jana Grcevich, Snezana Stanimirovic, M. E. Putman, Eric J. Korpela, Steven J. Gibson, Ayesha Begum,… 展开作者

J. E. G. Peek, Carl Heiles, Kevin A. Douglas, Min-Young Lee, Jana Grcevich, Snezana Stanimirovic, M. E. Putman, Eric J. Korpela, Steven J. Gibson, Ayesha Begum, Destry Saul, Timothy Robishaw, Marko Krco

摘要:

我们介绍了银河阿雷西博L波段馈源阵列HI(GALFA-HI)调查,及其第一次完整的数据发布(DR 1)。GALFA-HI是一项高分辨率(~ 4 ')、大面积(13000 deg^2)、高光谱分辨率(0.18 km/s)、宽波段(-700 < v_LSR < +700 km/s)的银河系星际介质巡天,在阿雷西博天文台进行,测量中性氢的21厘米线超精细跃迁。在1 km/s的综合信道中,典型噪声水平为80 mK RMS。GALFA-HI是高分辨率,大面积银河系HI调查的一个戏剧性的进步,我们将GALFA-HI与过去,现在和未来的银河系HI调查进行比较。我们详细描述了我们已经开发的新技术,以减少这些数据中存在的固定模式噪声,增益变化,和不一致的波束形状,我们展示了我们如何在很大程度上减轻这些影响。我们提出了我们的第一个完整的数据发布,覆盖7520平方度的天空,代表3046小时的集成时间,并讨论这些数据的细节。

英文摘要:

We present the Galactic Arecibo L-Band Feed Array HI (GALFA-HI) survey, and its first full data release (DR1). GALFA-HI is a high resolution (~ 4'), large area (13000 deg^2), high spectral resolution (0.18 km/s), wide band (-700 < v_LSR < +700 km/s) survey of the Galactic interstellar medium in the 21-cm line hyperfine transition of neutral hydrogen conducted at Arecibo Observatory. Typical noise levels are 80 mK RMS in an integrated 1 km/s channel. GALFA-HI is a dramatic step forward in high-resolution, large-area Galactic HI surveys, and we compare GALFA-HI to past, present, and future Galactic HI surveys. We describe in detail new techniques we have developed to reduce these data in the presence of fixed pattern noise, gain variation, and inconsistent beam shapes, and we show how we have largely mitigated these effects. We present our first full data release, covering 7520 square degrees of sky and representing 3046 hours of integration time, and discuss the details of these data.

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