Investigating radio source population and spatial characteristics of diffuse Galactic synchrotron emission in the GAMA-23 field with uGMRT Band-3
Abstract
We present upgraded Giant Meterwave Radio Telescope (uGMRT) Band-3 observations of the Galaxy and Mass Assembly (GAMA)-23 field. The observations consist of a total of 33 hours spread over 50 pointings, corresponding to ∼56 minutes per pointing at the central frequency of 325 MHz. The final image mosaicked from these pointings has a central off-source RMS noise of 109 μJy/beam and covers an area 65.31 deg2 with a resolution of 15.8''. This wide-area deep-field observation provides a radio source catalog of 5741 sources with flux densities ≥5σ. We present complementary uGMRT observations overlapping with the high-frequency Australian Square Kilometre Array Pathfinder Evolutionary Map of the Universe survey. We derived the spectral index from the matched sources in the GAMA-23 field for the first time. We have studied the statistical properties of diffuse Galactic synchrotron emission (DGSE) in the GAMA-23 field using six different latitude target pointings. We fitted DGSE in the form of power law Cℓ = A(1000/ℓ)β. Our DGSE amplitude range of A = 1−20 mK2 and β varies between $1.5$ and $2.4$. This work presents one of the first characterizations of DGSE in the southern sky at 325 MHz, setting a precedent for foreground modeling required for sensitive radio observations with the upcoming SKA.
Versions
Related
- Synchrotron Emission from Cooled Particle Distributions
- Synchrotron Emission from Cooled Particle Distributions
- Polarization of Synchrotron Emission from Rotation Powered Pulsars
- The Relation between Magnetic-field Intensity and Size of the Emission Region in the High-synchrotron-peaked BL Lacertae Object Mrk 421
- The Impact of a Clumpy Ambient Medium on the Dynamics and Synchrotron Emission of AGN Jets
BibTeX
@misc{sagar2026investigating,
title = {{Investigating radio source population and spatial characteristics of diffuse Galactic synchrotron emission in the GAMA-23 field with uGMRT Band-3}},
author = {Rashmi Sagar and Abhirup Datta and Aishrila Mazumder},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.05854},
eprint = {2608.05854},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.05854},
}
RIS
TY - UNPB
TI - Investigating radio source population and spatial characteristics of diffuse Galactic synchrotron emission in the GAMA-23 field with uGMRT Band-3
AU - Rashmi Sagar
AU - Abhirup Datta
AU - Aishrila Mazumder
PY - 2026
DA - 2026/08/31
PB - arXiv
DO - 10.48550/arxiv.2608.05854
UR - https://arxiv.org/abs/2608.05854
AB - We present upgraded Giant Meterwave Radio Telescope (uGMRT) Band-3 observations of the Galaxy and Mass Assembly (GAMA)-23 field. The observations consist of a total of 33 hours spread over 50 pointings, corresponding to ∼56 minutes per pointing at the central frequency of 325 MHz. The final image mosaicked from these pointings has a central off-source RMS noise of 109 μJy/beam and covers an area 65.31 deg^2 with a resolution of 15.8''. This wide-area deep-field observation provides a radio source catalog of 5741 sources with flux densities ≥5σ. We present complementary uGMRT observations overlapping with the high-frequency Australian Square Kilometre Array Pathfinder Evolutionary Map of the Universe survey. We derived the spectral index from the matched sources in the GAMA-23 field for the first time. We have studied the statistical properties of diffuse Galactic synchrotron emission (DGSE) in the GAMA-23 field using six different latitude target pointings. We fitted DGSE in the form of power law C_ℓ = A(1000/ℓ)^β. Our DGSE amplitude range of A = 1−20 mK^2 and β varies between $1.5$ and $2.4$. This work presents one of the first characterizations of DGSE in the southern sky at 325 MHz, setting a precedent for foreground modeling required for sensitive radio observations with the upcoming SKA.
ER -