Riggi, S, Umana, G, Trigilio, C, Cavallaro, F, Ingallinera, A, Leto, P, Bufano, F, Norris, RP, Hopkins, AM, Filipović, MD, Andernach, H, van Loon, JT ORCID: https://orcid.org/0000-0002-1272-3017, Michałowski, MJ, Bordiu, C, An, T, Buemi, C, Carretti, E, Collier, JD, Joseph, T, Koribalski, BS, Kothes, R, Loru, S, McConnell, D, Pommier, M, Sciacca, E, Schillirò, F, Vitello, F, Warhurst, K and Whiting, M (2021) Evolutionary map of the Universe (EMU): Compact radio sources in the scorpio field towards the galactic plane. Monthly Notices of the Royal Astronomical Society, 502 (1). 60 - 79.

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Abstract

We present observations of a region of the Galactic plane taken during the Early Science Program of the Australian Square Kilometre Array Pathfinder (ASKAP). In this context, we observed the scorpio field at 912MHz with an uncompleted array consisting of 15 commissioned antennas. The resulting map covers a square region of similar to 40deg(2), centred on (l, b) = (343.5 degrees, 0.75 degrees), with a synthesized beam of 24 x 21arcsec(2) and a background rms noise of 150-200 mu Jy beam(-1), increasing to 500-600 mu Jy beam(-1) close to the Galactic plane. A total of 3963 radio sources were detected and characterized in the field using the caesar source finder. We obtained differential source counts in agreement with previously published data after correction for source extraction and characterization uncertainties, estimated from simulated data. The ASKAP positional and flux density scale accuracy were also investigated through comparison with previous surveys (MGPS, NVSS) and additional observations of the scorpio field, carried out with ATCA at 2.1GHz and 10 arcsec spatial resolution. These allowed us to obtain a measurement of the spectral index for a subset of the catalogued sources and an estimated fraction of (at least) 8 percent of resolved sources in the reported catalogue. We cross-matched our catalogued sources with different astronomical data bases to search for possible counterparts, finding similar to 150 associations to known Galactic objects. Finally, we explored a multiparametric approach for classifying previously unreported Galactic sources based on their radio-infrared colours.

Item Type: Article
Additional Information: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Uncontrolled Keywords: techniques: image processing; techniques: interferometric; catalogues; surveys; Galaxy: general; radio continuum: general
Subjects: Q Science > Q Science (General)
Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 16 Jun 2021 11:23
Last Modified: 30 Jun 2021 15:01
URI: https://eprints.keele.ac.uk/id/eprint/9741

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