EMU: Evolutionary Map of the Universe

Abstract

EMU is a wide-field radio continuum survey planned for the new Australian Square Kilometre Array Pathfinder (ASKAP) telescope. The primary goal of EMU is to make a deep (rms ,10 mJy/beam) radio continuum survey of the entire Southern sky at 1.3 GHz, extending as far North as þ308 declination, with a resolution of 10 arcsec. EMU is expected to detect and catalogue about 70 million galaxies, including typical star-forming galaxies up to z , 1, powerful starbursts to even greater redshifts, and active galactic nuclei to the edge of the visible Universe. It will undoubtedly discover new classes of object. This paper defines the science goals and parameters of the survey, and describes the development of techniques necessary to maximise the science return from EMU.

duchamp: a 3D source finder for spectral-line data

“…This will be a survey telescope, built in the radioquiet SKA candidate site of Western Australia, that will be able E-mail: Matthew.Whiting@csiro.au to do, amongst other things, H I surveys over large areas of sky and a wide redshift range (due to its 30 deg 2 field of view and 300-MHz bandwidth). 10 'Survey Science Projects' (SSPs) have been identified as the major projects to consume at least 75 per cent of ASKAP's initial 5 years, and two of these are extragalactic H I surveys: the 'Widefield ASKAP L-band Legacy All-sky Blind surveY' (WALLABY; Koribalski & Staveley-Smith 2009), an allsky survey to z ∼ 0.26 that is one of two top-ranked projects [along with the 'Evolutionary Map of the Universe' (EMU; Norris et al 2011) all-sky continuum survey], and 'Deep Investigations into Neutral Gas Origins' (DINGO; Meyer 2009), a deeper survey over a smaller area to z ∼ 0.5. (Note that these are not the only SSPs with source finding requirements, they are simply the two surveys for extragalactic H I emission.)…”

Unsupervised self-organized mapping: a versatile empirical tool for object selection, classification and redshift estimation in large surveys

“…LOw Frequency ARray (LOFAR) and Square Kilometre Array pathfinders (e.g. Norris et al 2011)]. We are certainly entering exciting times in terms of our capability to survey the Universe across most of the electromagnetic spectrum, but these large surveys pose a common challenge: how does one efficiently mine the parameter volume when we move into the petabyte regime of information content?…”

Cosmic X-ray surveys of distant active galaxies

“…These data are sufficient to detect radio-bright X-ray sources, although the majority of the X-ray source population is ≈ 1-2 orders of magnitude fainter than the sensitivity of NVSS and FIRST. However, substantially deeper radio surveys are now being undertaken over > ∼ 1,000 deg 2 and many aim to cover the majority of the visible sky (e.g., at low < ∼ 200 MHz frequencies: GMRT-TGSS; LOFAR; MWA; at mid ≈ 1 GHz frequencies: Apertif-WODAN; ASKAP-EMU; MeerKAT-MIGHTEE; VLA-VLASS; see Norris et al 2011Norris et al , 2013Lazio et al 2014 for a recent summary). Many of these surveys are pre-cursors and pathfinders to the Square Kilometer Array (SKA; e.g., Dewdney et al 2009;Carilli 2014), an international project to build the world's largest radio telescope, planned to start operations over the next ≈ 10-20 yr.…”