MIGHTEE-H <scp>i</scp>: deep spectral line observations of the COSMOS field

ABSTRACT The MIGHTEE survey utilizes the South African MeerKAT radio telescope to observe four extragalactic deep fields, with the aim of advancing our understanding of the formation and evolution of galaxies across cosmic time. MIGHTEE’s frequency coverage encompasses the $\textrm {H}\scriptstyle \mathrm{I}$ line to a redshift of z $\simeq$ 0.58, and OH megamasers to z $\simeq$ 0.9. We present the MIGHTEE-$\textrm {H}\scriptstyle \mathrm{I}$ imaging products for the COSMOS field, using a total of 94.2 h on-target and a close-packed mosaic of 15 individual pointings. The spectral imaging covers two broad, relatively interference-free regions (960–1150 and 1290–1520 MHz) within MeerKAT’s L-band, with up to 26 kHz spectral resolution (5.5 km s$^{-1}$ at z = 0). The median noise in the highest spectral resolution data is 74 μJy beam$^{-1}$, corresponding to a 5$\sigma$$\textrm {H}\scriptstyle \mathrm{I}$ mass limit of 10$^{8.5}$ M$_{\odot }$ for a 300 km s$^{-1}$ line at z = 0.07. The mosaics cover $\gt $4 deg$^{2}$, provided at multiple angular resolution / sensitivity pairings, with an angular resolution for $\textrm {H}\scriptstyle \mathrm{I}$ at z = 0 of 12 arcsec. We describe the spectral line processing workflow that will be the basis for future MIGHTEE-$\textrm {H}\scriptstyle \mathrm{I}$ products, and validation of, and some early results from, the spectral imaging of the COSMOS field. We find no evidence for line emission at the position of the z = 0.376 $\textrm {H}\scriptstyle \mathrm{I}$ line reported from the CHILES survey at a $\gt $94 per cent confidence level, placing a 3$\sigma$ upper limit of 8.1 $\times$ 10$^{9}$ M$_{\odot }$ on $M_{\mathrm{HI}}$ for this galaxy. A public data release accompanies this article.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-09-05
DOI
https://doi.org/10.1093/mnras/stae2081
Citations
15
Primary Topic
Gamma-ray bursts and supernovae
Type
article
Field-Weighted Citation Impact
4.97

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article

MIGHTEE-H i: deep spectral line observations of the COSMOS field

G. Rodighiero, Mário G. Santos, M. Vaccari, Ian Heywood et al.
15 citations
Monthly Notices of the Royal Astronomical Society
Gamma-ray bursts and supernovae
4.97
article

MIGHTEE-H i: deep spectral line observations of the COSMOS field

G. Rodighiero, Mário G. Santos, M. Vaccari, Ian Heywood, J. D. Collier, Ilaria Ruffa, Marcin Glowacki, M. Baes, Anastasia A Ponomareva, Roger Deane, Elizabeth A. K. Adams, Francesco Sinigaglia, Hengxing Pan, B. S. Frank, Sambatriniaina H A Rajohnson, M. J. Jarvis, Natasha Maddox, S Lyla Jung, Alessandro Bianchetti
article en
15 citations

Abstract

ABSTRACT The MIGHTEE survey utilizes the South African MeerKAT radio telescope to observe four extragalactic deep fields, with the aim of advancing our understanding of the formation and evolution of galaxies across cosmic time. MIGHTEE’s frequency coverage encompasses the $\textrm {H}\scriptstyle \mathrm{I}$ line to a redshift of z $\simeq$ 0.58, and OH megamasers to z $\simeq$ 0.9. We present the MIGHTEE-$\textrm {H}\scriptstyle \mathrm{I}$ imaging products for the COSMOS field, using a total of 94.2 h on-target and a close-packed mosaic of 15 individual pointings. The spectral imaging covers two broad, relatively interference-free regions (960–1150 and 1290–1520 MHz) within MeerKAT’s L-band, with up to 26 kHz spectral resolution (5.5 km s$^{-1}$ at z = 0). The median noise in the highest spectral resolution data is 74 μJy beam$^{-1}$, corresponding to a 5$\sigma$$\textrm {H}\scriptstyle \mathrm{I}$ mass limit of 10$^{8.5}$ M$_{\odot }$ for a 300 km s$^{-1}$ line at z = 0.07. The mosaics cover $\gt $4 deg$^{2}$, provided at multiple angular resolution / sensitivity pairings, with an angular resolution for $\textrm {H}\scriptstyle \mathrm{I}$ at z = 0 of 12 arcsec. We describe the spectral line processing workflow that will be the basis for future MIGHTEE-$\textrm {H}\scriptstyle \mathrm{I}$ products, and validation of, and some early results from, the spectral imaging of the COSMOS field. We find no evidence for line emission at the position of the z = 0.376 $\textrm {H}\scriptstyle \mathrm{I}$ line reported from the CHILES survey at a $\gt $94 per cent confidence level, placing a 3$\sigma$ upper limit of 8.1 $\times$ 10$^{9}$ M$_{\odot }$ on $M_{\mathrm{HI}}$ for this galaxy. A public data release accompanies this article.

Monthly Notices of the Royal Astronomical SocietyVol. 534(1)
University of Geneva (CH), University of Padua (IT), University of Cape Town (ZA), University of Groningen (NL), University of the Witwatersrand (ZA), University of Zurich (CH), Rhodes University (ZA), Curtin University (AU), Ghent University (BE), University of Bristol (GB), University of Oxford (GB), Royal Observatory (GB), Istituto di Radioastronomia di Bologna (IT), South African Radio Astronomy Observatory (ZA), Osservatorio Astronomico di Padova (IT), International Centre for Radio Astronomy Research (AU), UK Astronomy Technology Centre (GB), University of Pretoria (ZA), Cardiff University (GB), University of the Western Cape (ZA), Netherlands Institute for Radio Astronomy (NL)
National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, Neurosciences Research Foundation, UK Research and Innovation, Breakthrough Prize Foundation, Department of Science and Innovation, South Africa, National Research Foundation, University of Pretoria, University of the Western Cape, Universiteit Stellenbosch, Cape Peninsula University of Technology, University of Cape Town, Center for High Performance Computing, Science and Technology Facilities Council, European Research Council, Australian Research Council
Openalex Percentile: Top 5%
Gamma-ray bursts and supernovae
4.97
DOIOpen Access PDFOpenAlex
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