The MWA Interestingly Deep AStrophysical (MIDAS) Survey: Survey Description and First Data Release
Abstract
We present the deepest MWA survey to date, targeting the GAMA9 and GAMA23 survey fields at 215.68 MHz. With a bandwidth of 30.72 MHz, the two images cover ∼1250 deg2 for the GAMA9 field and ∼850 deg2 for the GAMA23 field, with an angular resolution of ∼60''. The GAMA9 image was formed from 1 282 2-min snapshot observations (42.7 hours) and the GAMA23 image from 1 701 observations (56.7 hours) achieving depths of 0.923 ± 0.003 and 0.331 ± 0.001 mJy/beam at the field centres respectively. We processed the data with an updated version of the GLEAM-X pipeline tuned for deep surveys and make this MWA Deep Imaging Pipeline code public. Updates to the pipeline include automation of the observation downloading, calibration, and imaging along with optimisation of the CLEANing methods and parameters. Above 5σ, we catalogue 53 419 and 80 407 radio components in the GAMA9 and GAMA23 fields respectively. We find that the completeness corrected source counts for both fields are in good agreement down to $25−50$ mJy with those from LOFAR and earlier MWA surveys. We demonstrate the utility of this survey by highlighting a few sources of particular interest and describing future science possible with this survey.
Related
- The LOFAR Decametre Sky Survey (LoDeSS) I. Survey description and first data release
- The MAGPI Survey: Emission Line Products Data Release and the Role of Spectroscopic Aperture Covering Fraction on the Balmer Decrement-Stellar Mass Relation
- CAVITY: Calar Alto Void Integral-field Treasury surveY. II. Second public data release
- Euclid Quick Data Release (Q2) -- The Euclid Galactic Bulge Survey
- Resolved Dust in z≈1 Galaxies with JWST/MIRI MRS: Survey Description and First View on PAHs, Mid-IR Atomic Emission, and Warm H2
BibTeX
@misc{paterson2026interestingly,
title = {{The MWA Interestingly Deep AStrophysical (MIDAS) Survey: Survey Description and First Data Release}},
author = {S. Paterson and N. Seymour and N. Hurley-Walker and T. J. Galvin and S. W. Duchesne and J. Morgan and T. M. O. Franzen},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.01405},
eprint = {2609.01405},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.01405},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - The MWA Interestingly Deep AStrophysical (MIDAS) Survey: Survey Description and First Data Release
AU - S. Paterson
AU - N. Seymour
AU - N. Hurley-Walker
AU - T. J. Galvin
AU - S. W. Duchesne
AU - J. Morgan
AU - T. M. O. Franzen
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.01405
UR - https://arxiv.org/abs/2609.01405
AB - We present the deepest MWA survey to date, targeting the GAMA9 and GAMA23 survey fields at 215.68 MHz. With a bandwidth of 30.72 MHz, the two images cover ∼1250 deg^2 for the GAMA9 field and ∼850 deg^2 for the GAMA23 field, with an angular resolution of ∼60''. The GAMA9 image was formed from 1 282 2-min snapshot observations (42.7 hours) and the GAMA23 image from 1 701 observations (56.7 hours) achieving depths of 0.923 ± 0.003 and 0.331 ± 0.001 mJy/beam at the field centres respectively. We processed the data with an updated version of the GLEAM-X pipeline tuned for deep surveys and make this MWA Deep Imaging Pipeline code public. Updates to the pipeline include automation of the observation downloading, calibration, and imaging along with optimisation of the CLEANing methods and parameters. Above 5σ, we catalogue 53 419 and 80 407 radio components in the GAMA9 and GAMA23 fields respectively. We find that the completeness corrected source counts for both fields are in good agreement down to $25−50$ mJy with those from LOFAR and earlier MWA surveys. We demonstrate the utility of this survey by highlighting a few sources of particular interest and describing future science possible with this survey.
ER -