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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2022

The MAVERIC survey: a catalogue of radio sources in southern globular clusters from the Australia Telescope Compact Array

Vlad Tudor
  • Fonction : Auteur
James C.A. Miller-Jones
  • Fonction : Auteur
Jay Strader
Arash Bahramian
  • Fonction : Auteur
Laura Shishkovsky
  • Fonction : Auteur
Richard M. Plotkin
  • Fonction : Auteur
Laura Chomiuk
  • Fonction : Auteur
Craig O. Heinke
  • Fonction : Auteur
Thomas J. Maccarone
  • Fonction : Auteur
Gregory R. Sivakoff
  • Fonction : Auteur
Gemma E. Anderson
  • Fonction : Auteur
Thomas D. Russell
  • Fonction : Auteur
Anastasios K. Tzioumis
  • Fonction : Auteur

Résumé

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.
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Dates et versions

hal-03657137 , version 1 (13-04-2023)

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Vlad Tudor, James C.A. Miller-Jones, Jay Strader, Arash Bahramian, Laura Shishkovsky, et al.. The MAVERIC survey: a catalogue of radio sources in southern globular clusters from the Australia Telescope Compact Array. Monthly Notices of the Royal Astronomical Society, 2022, 513 (3), pp.3818-3835. ⟨10.1093/mnras/stac1034⟩. ⟨hal-03657137⟩
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