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MAVERIC survey: a catalogue of radio sources in southern globular clusters from the Australia Telescope Compact Array.
- Source :
-
Monthly Notices of the Royal Astronomical Society . Jul2022, Vol. 513 Issue 3, p3818-3835. 18p. - Publication Year :
- 2022
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Abstract
- Radio continuum observations offer a new window on compact objects in globular clusters compared to typical X-ray or optical studies. As part of the MAVERIC survey, we have used the Australia Telescope Compact Array to carry out a deep (median central noise level ≈4 |$\mu$| Jy beam-1) radio continuum survey of 26 southern globular clusters at central frequencies of 5.5 and 9.0 GHz. This paper presents a catalogue of 1285 radio continuum sources in the fields of these 26 clusters. Considering the surface density of background sources, we find significant evidence for a population of radio sources in seven of the 26 clusters, and also identify at least 11 previously known compact objects (six pulsars and five X-ray binaries). While the overall density of radio continuum sources with 7.25-GHz flux densities ≳ 20 |$\mu$| Jy in typical globular clusters is relatively low, the survey has already led to the discovery of several exciting compact binaries, including a candidate ultracompact black hole X-ray binary in 47 Tuc. Many of the unclassified radio sources near the centres of the clusters are likely to be true cluster sources, and multiwavelength follow-up will be necessary to classify these objects and better understand the demographics of accreting compact binaries in globular clusters. [ABSTRACT FROM AUTHOR]
- Subjects :
- *X-ray binaries
*BINARY black holes
*GLOBULAR clusters
*TELESCOPES
*ACTINIC flux
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 513
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 157263280
- Full Text :
- https://doi.org/10.1093/mnras/stac1034