The SARAO MeerKAT Galactic Plane Survey extended source catalogue
We present a catalogue of extended radio sources from the SARAO MeerKAT Galactic Plane Survey (SMGPS). Compiled from 56 survey tiles and covering approximately 500 deg 2 across the first, third, and fourth Galactic quadrants, the catalogue includes 16 534 extended and diffuse sources with areas larger than 5 synthesised beams. Of them, 3891 (24% of the total) are confidently associated with known Galactic radio-emitting objects in the literature, such as H II regions, supernova remnants, planetary nebulae, luminous blue variables, and Wolf-Rayet stars. A significant fraction of the remaining sources, 5462 (33%), are candidate extragalactic sources, while 7181 (43%) remain unclassified. Isolated radio filaments are excluded from the catalogue. The diversity of extended sources underscores MeerKAT’s contribution to the completeness of censuses of Galactic radio emitters, and its potential for new scientific discoveries. For the catalogued sources, we derived basic positional and morphological parameters, as well as flux density estimates, using standard aperture photometry. This paper describes the methods followed to generate the catalogue from the original SMGPS tiles, detailing the source extraction, characterisation, and crossmatching procedures. Additionally, we analyse the statistical properties of the catalogued populations.
Authors
- S. Goedhart (ORCID: https://orcid.org/0000-0003-3636-8731)
- F. Bufano (ORCID: https://orcid.org/0000-0002-3429-2481)
- S. Riggi (ORCID: https://orcid.org/0000-0001-6368-8330)
- M. A. Thompson (ORCID: https://orcid.org/0000-0001-5392-909X)
- F. Camilo (ORCID: https://orcid.org/0000-0002-1873-3718)
- A. J. Rigby (ORCID: https://orcid.org/0000-0002-3351-2200)
- Thomas Cecconello
- S. Loru (ORCID: https://orcid.org/0000-0001-5126-1719)
- C. S. Buemi (ORCID: https://orcid.org/0000-0002-7288-4613)
- W. D. Cotton (ORCID: https://orcid.org/0000-0001-7363-6489)
- G. Umana
- P. Leto (ORCID: https://orcid.org/0000-0003-4864-2806)
- M. F. Bietenholz
- C. Trigilio (ORCID: https://orcid.org/0000-0002-1216-7831)
- Cristóbal Bordiú (ORCID: https://orcid.org/0000-0002-7703-0692)
- F. Cavallaro (ORCID: https://orcid.org/0000-0003-1856-6806)
- A. Ingallinera (ORCID: https://orcid.org/0000-0002-3137-473X)
- James O. Chibueze (ORCID: https://orcid.org/0000-0002-9875-7436)
- L. D. Anderson (ORCID: https://orcid.org/0000-0001-8800-1793)
- M. Mutale
- G. M. Williams
Publication Details
- Journal
- Astronomy and Astrophysics
- Published
- 2025-02-20
- DOI
- https://doi.org/10.1051/0004-6361/202450356
- Citations
- 5
- Primary Topic
- Astronomical Observations and Instrumentation
- Type
- article
- Field-Weighted Citation Impact
- 6.67
Funders
- National Science Foundation
- European Commission
- University of Hertfordshire
- National Research Foundation
- Ministero degli Affari Esteri e della Cooperazione Internazionale
- Institut sur la Nutrition et les Aliments Fonctionnels
- Science and Technology Facilities Council