Cosmic Evolution Survey: LOFAR 144 MHz imaging of the COSMOS field

Abstract

We present the first deep, targeted LOFAR 144 MHz source catalogue of the COSMOS field, together with the first 144 MHz source counts in this field. The data comprise 48 h of observations. Over the 2.6 sq. deg. region adopted for the catalogue analysis, the final Dutch-array image reaches a median rms sensitivity of ~100 uJy/beam at an angular resolution of 15" x 6". The resulting catalogue contains 1984 radio sources; a peak S/N >= 5 selection is adopted for the resolved/unresolved classification and source-count analysis. We characterised the catalogue using Monte Carlo source-injection and recovery simulations, including dedicated simulations of extended sources, to quantify completeness, flux-density redistribution, and morphology-dependent source-recovery effects. The catalogue reaches 90% completeness at 1.48 mJy. The resulting Euclidean-normalised differential source counts are measured down to ~0.4 mJy and show good agreement with LoTSS DR3 144 MHz source counts and with the VLA-COSMOS 3 GHz counts scaled to 144 MHz, with ~5% of catalogue sources having multiple 3 GHz counterparts within a beam-matched search region. Comparison with the VLA-COSMOS 3 GHz catalogue shows good astrometric agreement, with median offsets of Delta_RA = 0.35" (+0.03"/-0.05") and Delta_Dec = -0.83" (+0.02"/-0.03"), approximately 6% of the corresponding synthesised-beam dimensions, and no significant radial dependence across the field. The resulting catalogue provides a low-frequency view of COSMOS and a reference dataset for future deeper LOFAR observations and multiwavelength studies of this extensively characterised extragalactic field.

Evolution of the morphology-density and morphology-mass relations of quiescent galaxies at 0.5 {2}lt;z<$ 2.5 in the COSMOS-Web survey
Guanwen Fang, Yuguo Su, Shiying Lu +2
Astronomy & Astrophysics8 Oct 2026Peer-reviewedPublisher termsGalaxiesCrossref
ALMA Chemical Evolution (ACE) survey: The gas fundamental metallicity relation at cosmic noon
I. Langan, I. Shivaei, G. Popping +11
arXiv7 Oct 2026PreprintarXiv licenceFull textGalaxiesarXiv
The First Blind Survey of Intervening NaI Absorbers: Incidence and Cosmic Evolution with DESI
Abhijeet Anand, Sowgat Muzahid
arXiv22 Sep 2026PreprintCC BY 4.0Full textCosmology GalaxiesarXiv
ALMA Chemical Evolution (ACE) survey: an overview -- extending dust and gas inference to low metallicities at cosmic noon
Irene Shivaei, Gergő Popping, Leindert A. Boogaard +13
arXiv18 Sep 2026PreprintCC BY 4.0Full textGalaxiesarXiv
ALMA Chemical Evolution (ACE) Survey: Molecular gas properties of low-mass, low-metallicity galaxies at cosmic noon
Gergő Popping, Ivanna Langan, Nikki N. Geesink +13
arXiv17 Sep 2026PreprintCC BY 4.0Full textGalaxiesarXiv

Cite

BibTeX RIS

BibTeX

@misc{vardoulaki2026cosmic,
  title = {{Cosmic Evolution Survey: LOFAR 144 MHz imaging of the COSMOS field}},
  author = {E. Vardoulaki and T. Shimwell and M. J. Hardcastle and L. Doukas and L. K. Morabito and C. L. Hale and M. T. Sargent and V. Smolčić and G. Zamorani and G. Gozaliasl and F. An and M. Aravena and A. L. Faisst and M. Vaccari and E. Treister and A. Finoguenov and P. Best and J. S. Kartaltepe and C. Casey and S. Jin and V. Mainieri},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.18648},
  eprint = {2610.18648},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.18648},
}

RIS

TY  - UNPB
TI  - Cosmic Evolution Survey: LOFAR 144 MHz imaging of the COSMOS field
AU  - E. Vardoulaki
AU  - T. Shimwell
AU  - M. J. Hardcastle
AU  - L. Doukas
AU  - L. K. Morabito
AU  - C. L. Hale
AU  - M. T. Sargent
AU  - V. Smolčić
AU  - G. Zamorani
AU  - G. Gozaliasl
AU  - F. An
AU  - M. Aravena
AU  - A. L. Faisst
AU  - M. Vaccari
AU  - E. Treister
AU  - A. Finoguenov
AU  - P. Best
AU  - J. S. Kartaltepe
AU  - C. Casey
AU  - S. Jin
AU  - V. Mainieri
PY  - 2026
DA  - 2026/10/13
PB  - arXiv
DO  - 10.48550/arxiv.2610.18648
UR  - https://arxiv.org/abs/2610.18648
AB  - We present the first deep, targeted LOFAR 144 MHz source catalogue of the COSMOS field, together with the first 144 MHz source counts in this field. The data comprise 48 h of observations. Over the 2.6 sq. deg. region adopted for the catalogue analysis, the final Dutch-array image reaches a median rms sensitivity of ~100 uJy/beam at an angular resolution of 15" x 6". The resulting catalogue contains 1984 radio sources; a peak S/N >= 5 selection is adopted for the resolved/unresolved classification and source-count analysis. We characterised the catalogue using Monte Carlo source-injection and recovery simulations, including dedicated simulations of extended sources, to quantify completeness, flux-density redistribution, and morphology-dependent source-recovery effects. The catalogue reaches 90% completeness at 1.48 mJy. The resulting Euclidean-normalised differential source counts are measured down to ~0.4 mJy and show good agreement with LoTSS DR3 144 MHz source counts and with the VLA-COSMOS 3 GHz counts scaled to 144 MHz, with ~5% of catalogue sources having multiple 3 GHz counterparts within a beam-matched search region. Comparison with the VLA-COSMOS 3 GHz catalogue shows good astrometric agreement, with median offsets of Delta_RA = 0.35" (+0.03"/-0.05") and Delta_Dec = -0.83" (+0.02"/-0.03"), approximately 6% of the corresponding synthesised-beam dimensions, and no significant radial dependence across the field. The resulting catalogue provides a low-frequency view of COSMOS and a reference dataset for future deeper LOFAR observations and multiwavelength studies of this extensively characterised extragalactic field.
ER  -

Abstract

Related

Cite