A first glimpse at the Galactic plane with the ASKAP: the SCORPIO field

Author:

Umana G1ORCID,Trigilio C1,Ingallinera A1ORCID,Riggi S1,Cavallaro F12ORCID,Marvil J3,Norris R P45ORCID,Hopkins A M6,Buemi C S1,Bufano F1,Leto P1ORCID,Loru S1,Bordiu C1ORCID,Bunton J D4,Collier J D25ORCID,Filipovic M5,Franzen T M O7,Thompson M A8ORCID,Andernach H9ORCID,Carretti E10ORCID,Dai S5ORCID,Kapińska A3,Koribalski B S45ORCID,Kothes R11,Leahy D12ORCID,Mcconnell D4,Tothill N5,Michałowski M J13ORCID

Affiliation:

1. INAF-Osservatorio Astrofisico di Catania, Via Santa Sofia 78, I-95123 Catania, Italy

2. The Inter-University Institute for Data Intensive Astronomy (IDIA), Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa

3. National Radio Astronomy Observatory, Domenici Science Operations Center 1003 Lopezville Rd, Socorro, NM 87801, USA

4. CSIRO Astronomy & Space Science, P.Of. Box 76, Epping, NSW 1710, Australia

5. School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia

6. Australian Astronomical Optics, Macquarie University, 105 Delhi Rd, North Ryde, NSW 2113, Australia

7. ASTRON: The Netherlands Institute for Radio Astronomy, PO Box 2, NL-7990 AA, Dwingeloo, the Netherlands

8. Centre for Astrophysics Research, Department of Physics Astronomy & Mathematics, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB, UK

9. Departamento de Astronomía, DCNE, Universidad de Guanajuato, Callejón de Jalisco s/n, Guanajuato, Mexico

10. INAF, Istituto di Radioastronomia, Via Gobetti 101, Bologna, Italy

11. Dominion Radio Astrophysical Observatory, Herzberg Astronomy and Astrophysics, National Research Council Canada, PO Box 248, Penticton, BC V2A 6J9, Canada

12. Department of Physics and Astronomy, University of Calgary, 2500 University Dr.NW, Calgary, AB T2N 1N4, Canada

13. Astronomical Observatory Institute, Faculty of Physics Adam Mickiewicz University in Poznan, ul. Sloneczna 36, PL-60-286 Poznan, Poland

Abstract

ABSTRACT In the broad context of the Australian Square Kilometer Array Pathfinder (ASKAP) early-science phase and preparation for the related surveys, we report the first radio observations towards the Galactic plane. The targeted field was chosen to encompass the entire SCORPIO survey, one of the several pathfinder projects for the Evolutionary Map of the Universe survey planned with the ASKAP. The observations were carried out in 2018 January at a central frequency of 912 MHz, with 15 operational antennas, and covered a total area of about 40 square degrees in three different pointings. The final image has a resolution of 24.1 × 21.1 arcsec2 and a median rms of $541\ \mu \mathrm{Jy\ beam}^{-1}$. We were able to extract 3545 candidate sources, 75 per cent of them point sources. For a preliminary validation, a comparison with the 843 MHz Molonglo Galactic Plane Survey is presented. Although the present observations were obtained with the ASKAP only partially deployed, its unique capability to map complex sources, such as those inhabiting the Galactic plane, at different angular scales, is highlighted. Within the SCORPIO field all the previously classified H ii regions, Planetary Nebulae (PNe), and supernovae remnants (SNRs), previously known to be radio sources, were detected. We also report new radio detections from several H ii regions previously classified as ‘candidates’ or ‘radio quiet’ and from half of all the PNe in the SCORPIO field with robust classification. Most notably, we find numerous unclassified, extended sources which constitute a promising sample of candidates H ii regions and SNRs.

Funder

Universidad de Guanajuato

National Science Centre

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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