WALLABY -- An SKA Pathfinder HI Survey
| Autor: | 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. |
|---|---|
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Ap&SS 365, 118 (2020) - https://rdcu.be/b5Bfg |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/s10509-020-03831-4 |
| Popis: | 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). Comment: Accepted for publication in ApSS (38 pages, 14 figures), see also https://www.atnf.csiro.au/research/WALLABY/ - Contact email: Baerbel.Koribalski@csiro.au |
| Databáze: | arXiv |
| Externí odkaz: |
|