小袋鼠 - Ska探路者HI调查

论文标题

小袋鼠 - Ska探路者HI调查

WALLABY -- An SKA Pathfinder HI Survey

论文作者

Koribalski, B. S., Staveley-Smith, L., Westmeier, T., Serra, P., Spekkens, K., Wong, O. I., Lagos, C. D. P., Obreschkow, D., Ryan-Weber, E. V., Zwaan, M., Kilborn, V., Bekiaris, G., Bekki, K., Bigiel, F., Boselli, A., Bosma, A., Catinella, B., Chauhan, G., Cluver, M. E., Colless, M., Courtois, H. M., Crain, R. A., de Blok, W. J. G., Dénes, H., Duffy, A. R., Elagali, A., Fluke, C. J., For, B. -Q., Heald, G., Henning, P. A., Hess, K. M., Holwerda, B. W., Howlett, C., Jarrett, T., Jones, D. H., Jones, M. G., Józsa, G. I. G., Jurek, R., Jütte, E., Kamphuis, P., Karachentsev, I., Kerp, J., Keiner, D., Kraan-Korteweg, R. C., Lee-Waddell, K., López-Sánchez, A. R., Madrid, J., Meyer, M., Mould, J., Murugeshan, C., Norris, R. P., Oh, S. -H., Oosterloo, T. A., Popping, A., Putman, M., Reynolds, T. N., Rhee, J., Robotham, A. S. G., Ryder, S., Schröder, A. C., Shao, Li, Stevens, A. R. H., Taylor, E. N., van der Hulst, J. M., Verdes-Montenegro, L., Wakker, B. P., Wang, J., Whiting, M., Winkel, B., Wolf, C.

论文摘要

广阔的Askap L波段遗产全家盲目调查（Wallaby）是当地宇宙中中性氢（HI）的下一代调查。它使用澳大利亚平方公里阵列探路者（ASKAP）的广场高分辨率能力，这是一种无线电干涉仪，该干涉仪由位于澳大利亚西部极为放射线的区域中的36 x 12 m菜肴组成，配备有杆阵饲料（PAFS）。小袋鼠的目的是调查三分之三的天空（-90 dec <+30 degr）对z <0.26的红移，并以〜30 Arcsec分辨率生成光谱线图形群，每4 km/s通道灵敏度〜1.6 mjy/beam/4 km/s。由PAF的36梁传递的1.4 GHz的Askap瞬时视野约为30平方英尺。在综合信号噪声比为五个的情况下，袋鼠有望检测到超过半百万的星系，平均红移为z〜0.05（〜200 mpc）。小袋鼠的科学目标包括：（a）当地集团附近气体富含气的星系的普查；（b）研究星系，组和簇的HI性质，特别是环境对星系进化的影响；（c）使用低偏置气体星系的空间和红移分布对宇宙学参数的完善。对于上下文，我们提供了以前的大型HI调查的概述。结合现有的和新的多波长天空调查，袋鼠将使当地宇宙的新一代全天候研究能够。 - 透露袋鼠试点调查的首先结果，其中最初的数据产品在CSIRO ASKAP科学数据存档（CASDA）中公开可用。

The Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) is a next-generation survey of neutral hydrogen (HI) in the Local Universe. It uses the widefield, high-resolution capability of the Australian Square Kilometer Array Pathfinder (ASKAP), a radio interferometer consisting of 36 x 12-m dishes equipped with Phased-Array Feeds (PAFs), located in an extremely radio-quiet zone in Western Australia. WALLABY aims to survey three-quarters of the sky (-90 degr < Dec < +30 degr) to a redshift of z < 0.26, and generate spectral line image cubes at ~30 arcsec resolution and ~1.6 mJy/beam per 4 km/s channel sensitivity. ASKAP's instantaneous field of view at 1.4 GHz, delivered by the PAF's 36 beams, is about 30 sq deg. At an integrated signal-to-noise ratio of five, WALLABY is expected to detect over half a million galaxies with a mean redshift of z ~ 0.05 (~200 Mpc). The scientific goals of WALLABY include: (a) a census of gas-rich galaxies in the vicinity of the Local Group; (b) a study of the HI properties of galaxies, groups and clusters, in particular the influence of the environment on galaxy evolution; and (c) the refinement of cosmological parameters using the spatial and redshift distribution of low-bias gas-rich galaxies. For context we provide an overview of previous large-scale HI surveys. Combined with existing and new multi-wavelength sky surveys, WALLABY will enable an exciting new generation of panchromatic studies of the Local Universe. - First results from the WALLABY pilot survey are revealed, with initial data products publicly available in the CSIRO ASKAP Science Data Archive (CASDA).

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