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WALLABY – an SKA Pathfinder H i survey
Astrophysics and Space Science ( IF 1.9 ) Pub Date : 2020-07-01 , DOI: 10.1007/s10509-020-03831-4
Bärbel S. Koribalski , L. Staveley-Smith , T. Westmeier , P. Serra , K. Spekkens , O. I. Wong , K. Lee-Waddell , C. D. P. Lagos , D. Obreschkow , E. V. Ryan-Weber , M. Zwaan , V. Kilborn , G. Bekiaris , K. Bekki , F. Bigiel , A. Boselli , A. Bosma , B. Catinella , G. Chauhan , M. E. Cluver , M. Colless , H. M. Courtois , R. A. Crain , W. J. G. de Blok , H. Dénes , A. R. Duffy , A. Elagali , C. J. Fluke , B.-Q. For , G. Heald , P. A. Henning , K. M. Hess , B. W. Holwerda , C. Howlett , T. Jarrett , D. H. Jones , M. G. Jones , G. I. G. Józsa , R. Jurek , E. Jütte , P. Kamphuis , I. Karachentsev , J. Kerp , D. Kleiner , R. C. Kraan-Korteweg , Á. R. López-Sánchez , J. Madrid , M. Meyer , J. Mould , C. Murugeshan , R. P. Norris , S.-H. Oh , T. A. Oosterloo , A. Popping , M. Putman , T. N. Reynolds , J. Rhee , A. S. G. Robotham , S. Ryder , A. C. Schröder , Li Shao , A. R. H. Stevens , E. N. Taylor , J. M. van der Hulst , L. Verdes-Montenegro , B. P. Wakker , J. Wang , M. Whiting , B. Winkel , C. Wolf

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).

中文翻译:

WALLABY – SKA Pathfinder Hi 调查

Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) 是对本地宇宙中中性氢 (HI) 的下一代调查。它利用了澳大利亚平方公里阵列探路者 (ASKAP) 的宽场、高分辨率功能,这是一种无线电干涉仪,由配备相控阵馈源 (PAF) 的 36 x 12 米碟形天线组成,位于澳大利亚极其无线电静默的区域。澳洲西部。WALLABY 的目标是将四分之三的天空(-90 degr < Dec < +30 degr)测量到 z < 0.26 的红移,并以约 30 弧秒的分辨率和约 1.6 mJy/beam/beam/4 km/ 生成谱线图像立方体s 通道灵敏度。ASKAP 的 1.4 GHz 瞬时视场由 PAF 的 36 条光束提供,约为 30 平方度。在综合信噪比为 5 时,WALLABY 预计将探测到超过 50 万个平均红移为 z ~ 0.05 (~200 Mpc) 的星系。WALLABY 的科学目标包括: (a) 对本地组附近富含气体的星系进行普查;(b) 研究星系、群和星团的 HI 特性,特别是环境对星系演化的影响;(c) 使用低偏差富含气体的星系的空间和红移分布来细化宇宙学参数。对于上下文,我们提供了以前大规模 HI 调查的概述。结合现有的和新的多波长天空调查,WALLABY 将使令人兴奋的新一代本地宇宙全色研究成为可能。- WALLABY 试点调查的初步结果公布,初步数据产品可在 CSIRO ASKAP 科学数据档案 (CASDA) 中公开获取。
更新日期:2020-07-01
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