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PreprintarXiv licencearXiv

GAMA-23 deep field with uGMRT Band-2: source catalogue and source count

  • Rashmi Sagar
  • Abhirup Datta
  • Aishrila Mazumder
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Abstract

We present the low-frequency GAMA-23 field of the Galaxy and Mass Assembly (GAMA) survey with upgraded Giant Meterwave Radio Telescope (uGMRT) observations in Band-2 (120−250 MHz). The on-source observation was conducted for ∼5 hours. The final image achieved an off-source RMS noise of 320 μJy beam−1, covering an area of 5.86 deg2 with restoring beam size of 15.4''×8.2'' at the central frequency of 183 MHz. The catalogue derived from the radio image includes 569 sources with a flux density limit of ≥ 5σ. The flux density measurements and the positional accuracy are cross-verified and compared with other radio catalogues available in the literature. The spectral indices derived from fitting a power law are -0.68+0.18−0.23 for the ASKAP EMU catalogue and -0.72+0.19−0.24 for the NVSS catalogue. The normalised source count derived from this catalogue is consistent with models and observations with a nominal catalogue threshold of 1.7 mJy, while the sensitivity varies across the image.

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Cite

BibTeXRIS
BibTeX
@misc{sagar2026gama23,
  title = {{GAMA-23 deep field with uGMRT Band-2: source catalogue and source count}},
  author = {Rashmi Sagar and Abhirup Datta and Aishrila Mazumder},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.04905},
  eprint = {2611.04905},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.04905},
}
RIS
TY  - UNPB
TI  - GAMA-23 deep field with uGMRT Band-2: source catalogue and source count
AU  - Rashmi Sagar
AU  - Abhirup Datta
AU  - Aishrila Mazumder
PY  - 2026
DA  - 2026/11/03
PB  - arXiv
DO  - 10.48550/arxiv.2611.04905
UR  - https://arxiv.org/abs/2611.04905
AB  - We present the low-frequency GAMA-23 field of the Galaxy and Mass Assembly (GAMA) survey with upgraded Giant Meterwave Radio Telescope (uGMRT) observations in Band-2 (120−250 MHz). The on-source observation was conducted for ∼5 hours. The final image achieved an off-source RMS noise of 320 μJy beam^−1, covering an area of 5.86 deg^2 with restoring beam size of 15.4''×8.2'' at the central frequency of 183 MHz. The catalogue derived from the radio image includes 569 sources with a flux density limit of ≥ 5σ. The flux density measurements and the positional accuracy are cross-verified and compared with other radio catalogues available in the literature. The spectral indices derived from fitting a power law are -0.68^+0.18_−0.23 for the ASKAP EMU catalogue and -0.72^+0.19_−0.24 for the NVSS catalogue. The normalised source count derived from this catalogue is consistent with models and observations with a nominal catalogue threshold of 1.7 mJy, while the sensitivity varies across the image.
ER  -