Galaxy and mass assembly (GAMA): The merging potential of brightest group galaxies

Banks, K.; Brough, S.; Holwerda, B. W.; Hopkins, A. M.; López-Sánchez, R.; Phillipps, S.; Pimbblet, K. A.; Robotham, A. S.G.

doi:10.3847/1538-4357/ac1c0a

The First Large Absorption Survey in H i (FLASH): II. Pilot Survey data release and first results (2025)
Journal Article
Yoon, H., Sadler, E. M., Mahony, E. K., Aditya, J. N. H. S., Allison, J. R., Glowacki, M., Kerrison, E. F., Moss, V. A., Su, R., Weng, S., Whiting, M., Wong, O. I., Callingham, J. R., Curran, S. J., Darling, J., Edge, A. C., Ellison, S. L., Emig, K. L., Garratt-Smithson, L., German, G., …Westmeier, T. (2025). The First Large Absorption Survey in H i (FLASH): II. Pilot Survey data release and first results. Publications of the Astronomical Society of Australia, 42, Article e088. https://doi.org/10.1017/pasa.2025.10046

The First Large Absorption Survey in H I (FLASH) is a large-area radio survey for neutral hydrogen in and around galaxies in the intermediate redshift range 0.4 < z < 1.0, using the 21-cm H I absorption line as a probe of cold neutral gas. The survey... Read More about The First Large Absorption Survey in H i (FLASH): II. Pilot Survey data release and first results.

Vasectomy, Management, and Pain: A Natural Language Processing Analysis of Online Communities (2025)
Journal Article
Pimbblet, K. A. (2025). Vasectomy, Management, and Pain: A Natural Language Processing Analysis of Online Communities. International Journal of Urological Nursing, 19(2), Article e70016. https://doi.org/10.1111/ijun.70016

Is the use of vasectomy in the United Kingdom experiencing a significant decline due to knowledge of post-vasectomy pain syndrome transmitted through online public forums? Although vasectomy is regularly used as a form of contraception and is general... Read More about Vasectomy, Management, and Pain: A Natural Language Processing Analysis of Online Communities.

A catalogue of complex radio sources in the Rapid ASKAP Continuum Survey created using a Self-Organising Map (2025)
Journal Article
Alam, A., Pimbblet, K., & Gordon, Y. (2025). A catalogue of complex radio sources in the Rapid ASKAP Continuum Survey created using a Self-Organising Map. Publications / Astronomical Society of Australia, 42, Article e013. https://doi.org/10.1017/pasa.2024.133

Next generations of radio surveys are expected to identify tens of millions of new sources, and identifying and classifying their morphologies will require novel and more efficient methods. Self-Organising Maps (SOMs), a type of unsupervised machine... Read More about A catalogue of complex radio sources in the Rapid ASKAP Continuum Survey created using a Self-Organising Map.

The Galaxy Zoo catalogues for Galaxy and Mass Assembly (GAMA) survey (2024)
Journal Article
Holwerda, B. W., Robertson, C., Cook, K., Pimbblet, K., Casura, S., Sansom, A. E., Patel, D., Butrum, T. A., Glass, D. H. W., Kelvin, L. S., Baldry, I. K., De Propris, R., Bamford, S., Masters, K., Stone, M. B., Hardin, T., Walmsley, M., Liske, J., & Adnan, S. M. (2024). The Galaxy Zoo catalogues for Galaxy and Mass Assembly (GAMA) survey. Publications / Astronomical Society of Australia, 41, Article e115. https://doi.org/10.1017/pasa.2024.109

Galaxy Zoo is an online project to classify morphological features in extra-galactic imaging surveys with public voting. In this paper, we compare the classifications made for two different surveys, the Dark Energy Spectroscopic Instrument (DESI) ima... Read More about The Galaxy Zoo catalogues for Galaxy and Mass Assembly (GAMA) survey.

Can ChatGPT pass a physics degree? Making a case for reformation of assessment of undergraduate degrees (2024)
Journal Article
Pimbblet, K. A., & Morrell, L. J. (2025). Can ChatGPT pass a physics degree? Making a case for reformation of assessment of undergraduate degrees. European Journal of Physics, 46(1), Article 015702. https://doi.org/10.1088/1361-6404/ad9874

The emergence of conversational natural language processing models presents a significant challenge for Higher Education. In this work, we use the entirety of a UK Physics undergraduate (BSc with Honours) degree including all examinations and coursew... Read More about Can ChatGPT pass a physics degree? Making a case for reformation of assessment of undergraduate degrees.

A search for H i absorption in distant star-forming galaxies with ASKAP-FLASH -I. Selection and analysis of the radio sample (2024)
Journal Article
Eden, S. L., Sadler, E. M., Pimbblet, K. A., Mahony, E. K., & Yoon, H. (2025). A search for H i absorption in distant star-forming galaxies with ASKAP-FLASH -I. Selection and analysis of the radio sample. Monthly notices of the Royal Astronomical Society, 536(1), 387-407. https://doi.org/10.1093/mnras/stae2581

We present and discuss two catalogues of UV-selected (NUV < 22.8 mag) galaxies that lie within a 200 deg 2 area of sky covered by the ASKAP FLASH survey and have an impact parameter of less than 20 arcsec to a FLASH radio continuum source. These cata... Read More about A search for H i absorption in distant star-forming galaxies with ASKAP-FLASH -I. Selection and analysis of the radio sample.

A Single Shot Multi-Head Gender, Age, and Landmarks Detection using Shared Convolution Features (2024)
Presentation / Conference Contribution
Khan, G., Pimbblet, K., Wertheim, K., & Ahmed, W. (2024, August). A Single Shot Multi-Head Gender, Age, and Landmarks Detection using Shared Convolution Features. Presented at 2024 29th International Conference on Automation and Computing (ICAC), Sunderland, United Kingdom

Considering the face as a vital and most informative portion of the human body, it reflects different high-level information about an individual. This high-level information includes Age, Gender, and Emotion. Facial muscles' shape and movement can be... Read More about A Single Shot Multi-Head Gender, Age, and Landmarks Detection using Shared Convolution Features.

Predicting the ages of galaxies with an artificial neural network (2024)
Journal Article
Hunt, L. J., Pimbblet, K. A., & Benoit, D. M. (2024). Predicting the ages of galaxies with an artificial neural network. Monthly notices of the Royal Astronomical Society, 529(1), 479-498. https://doi.org/10.1093/mnras/stae479

We present a new method of predicting the ages of galaxies using a machine learning (ML) algorithm with the goal of providing an alternative to traditional methods. We aim to match the ability of traditional models to predict the ages of galaxies by... Read More about Predicting the ages of galaxies with an artificial neural network.

The loneliest galaxies in the Universe: a GAMA and Galaxy Zoo study on void galaxy morphology (2023)
Journal Article
Porter, L. E., Holwerda, B. W., Kruk, S., Lara-López, M., Pimbblet, K. A., Henry, C. P., Casura, S., & Kelvin, L. S. (2023). The loneliest galaxies in the Universe: a GAMA and Galaxy Zoo study on void galaxy morphology. Monthly notices of the Royal Astronomical Society, 524(4), 5768-5780. https://doi.org/10.1093/mnras/stad1125

The large-scale structure of the Universe is comprised of galaxy filaments, tendrils, and voids. The majority of the Universe's volume is taken up by these voids, which exist as underdense, but not empty, regions. The galaxies found inside these void... Read More about The loneliest galaxies in the Universe: a GAMA and Galaxy Zoo study on void galaxy morphology.

Your essential guide to the many breathtaking wonders of the universe (2023)
Newspaper / Magazine
Beall, A. (2023). Your essential guide to the many breathtaking wonders of the universe

An abridged inventory of everything there is in the universe – from rogue planets and exomoons to supernovae, supermassive black holes and the cosmic web.

Noise reduction in single-shot images using an auto-encoder (2023)
Journal Article
Bartlett, O. J., Benoit, D. M., Pimbblet, K. A., Simmons, B., & Hunt, L. (2023). Noise reduction in single-shot images using an auto-encoder. Monthly notices of the Royal Astronomical Society, 521(4), 6318-6329. https://doi.org/10.1093/mnras/stad665

We present an application of auto-encoders to the problem of noise reduction in single-shot astronomical images and explore its suitability for upcoming large-scale surveys. Auto-encoders are a machine learning model that summarizes an input to ident... Read More about Noise reduction in single-shot images using an auto-encoder.

Modelling strong lenses from wide-field ground-based observations in KiDS and GAMA (2023)
Journal Article
Knabel, S., Holwerda, B. W., Nightingale, J., Treu, T., Bilicki, M., Brough, S., Driver, S., Finnerty, L., Haberzettl, L., Hegde, S., Hopkins, A. M., Kuijken, K., Liske, J., Pimblett, A. K., Steele, R. C., & Wright, A. H. (2023). Modelling strong lenses from wide-field ground-based observations in KiDS and GAMA. Monthly notices of the Royal Astronomical Society, 520(1), 804-827. https://doi.org/10.1093/mnras/stad133

Despite the success of galaxy-scale strong gravitational lens studies with Hubble-quality imaging, a number of well-studied strong lenses remains small. As a result, robust comparisons of the lens models to theoretical predictions are difficult. This... Read More about Modelling strong lenses from wide-field ground-based observations in KiDS and GAMA.

Galaxy and Mass Assembly (GAMA): Extended intragroup light in a group at z = 0.2 from deep Hyper Suprime-Cam images (2022)
Journal Article
Pimbblet, K. A., Martínez-Lombilla, C., Brough, S., Montes, M., Baena-Gallé, R., Akhlaghi, M., Infante-Sainz, R., Driver, S. P., Holwerda, B. W., & Robotham, A. S. (2023). Galaxy and Mass Assembly (GAMA): Extended intragroup light in a group at z = 0.2 from deep Hyper Suprime-Cam images. Monthly notices of the Royal Astronomical Society, 518(1), 1195-1213. https://doi.org/10.1093/mnras/stac3119

We present a pilot study to assess the potential of Hyper Suprime-Cam Public Data Release 2 (HSC-PDR2) images for the analysis of extended faint structures within groups of galaxies. We examine the intragroup light (IGL) of the group 400138 (Mdyn = 1... Read More about Galaxy and Mass Assembly (GAMA): Extended intragroup light in a group at z = 0.2 from deep Hyper Suprime-Cam images.

Galaxy And Mass Assembly: galaxy morphology in the green valley, prominent rings, and looser spiral arms (2022)
Journal Article
Smith, D., Haberzettl, L., Porter, L. E., Porter-Temple, R., Henry, C. P., Holwerda, B., López-Sánchez, R., Phillipps, S., Graham, A. W., Brough, S., Pimbblet, K. A., Liske, J., Kelvin, L. S., Robertson, C. D., Roemer, W., Walmsley, M., O’Ryan, D., & Géron, T. (2022). Galaxy And Mass Assembly: galaxy morphology in the green valley, prominent rings, and looser spiral arms. Monthly notices of the Royal Astronomical Society, 517(3), 4575-4589. https://doi.org/10.1093/mnras/stac2258

Galaxies fall broadly into two categories: star-forming (blue) galaxies and quiescent (red) galaxies. In between, one finds the less populated 'green valley'. Some of these galaxies are suspected to be in the process of ceasing their star formation t... Read More about Galaxy And Mass Assembly: galaxy morphology in the green valley, prominent rings, and looser spiral arms.

Galaxy and mass assembly (GAMA): Self-Organizing Map application on nearby galaxies (2022)
Journal Article
Holwerda, B. W., Smith, D., Porter, L., Henry, C., Porter-Temple, R., Cook, K., Pimbblet, K. A., Hopkins, A. M., Bilicki, M., Turner, S., Acquaviva, V., Wang, L., Wright, A. H., Kelvin, L. S., & Grootes, M. W. (2022). Galaxy and mass assembly (GAMA): Self-Organizing Map application on nearby galaxies. Monthly notices of the Royal Astronomical Society, 513(2), 1972-1984. https://doi.org/10.1093/mnras/stac889

Galaxy populations show bimodality in a variety of properties: stellar mass, colour, specific star-formation rate, size, and Sérsic index. These parameters are our feature space. We use an existing sample of 7556 galaxies from the Galaxy and Mass Ass... Read More about Galaxy and mass assembly (GAMA): Self-Organizing Map application on nearby galaxies.

Galaxy and Mass Assembly (GAMA): The Weak Environmental Dependence of Quasar Activity at 0.1< z <0.35 (2022)
Journal Article
Wethers, C. F., Acharya, N., De Propris, R., Kotilainen, J., Baldry, I. K., Brough, S., Driver, S. P., Graham, A. W., Holwerda, B. W., Hopkins, A. M., López-Sánchez, A. R., Loveday, J., Phillipps, S., Pimbblet, K. A., Taylor, E., Wang, L., & Wright, A. H. (2022). Galaxy and Mass Assembly (GAMA): The Weak Environmental Dependence of Quasar Activity at 0.1< z

Understanding the connection between nuclear activity and galaxy environment remains critical in constraining models of galaxy evolution. By exploiting extensive catalogued data from the Galaxy and Mass Assembly (GAMA) survey, we identify a represent... Read More about Galaxy and Mass Assembly (GAMA): The Weak Environmental Dependence of Quasar Activity at 0.1< z <0.35.

Galaxy And Mass Assembly (GAMA): Data Release 4 and the z < 0.1 total and z < 0.08 morphological galaxy stellar mass functions (2022)
Journal Article
Driver, S. P., Bellstedt, S., Robotham, A. S. G., Baldry, I. K., Davies, L. J., Liske, J., Obreschkow, D., Taylor, E. N., Wright, A. H., Alpaslan, M., Bamford, S. P., Bauer, A. E., Bland-Hawthorn, J., Bilicki, M., Bravo, M., Brough, S., Casura, S., Cluver, M. E., Colless, M., Conselice, C. J., …Wilkins, S. M. (2022). Galaxy And Mass Assembly (GAMA): Data Release 4 and the z < 0.1 total and z < 0.08 morphological galaxy stellar mass functions. Monthly notices of the Royal Astronomical Society, 513(1), 439-467. https://doi.org/10.1093/mnras/stac472

In Galaxy And Mass Assembly Data Release 4 (GAMA DR4), we make available our full spectroscopic redshift sample. This includes 248 682 galaxy spectra, and, in combination with earlier surveys, results in 330 542 redshifts across five sky regions cove... Read More about Galaxy And Mass Assembly (GAMA): Data Release 4 and the z < 0.1 total and z < 0.08 morphological galaxy stellar mass functions.

The Detection of a Massive Chain of Dark H i Clouds in the GAMA G23 Field (2022)
Journal Article
Józsa, G. I., Jarrett, T. H., Cluver, M. E., Wong, O. I., Havenga, O., Yao, H. F., Marchetti, L., Taylor, E. N., Kamphuis, P., MacCagni, F. M., Ramaila, A. J., Serra, P., Smirnov, O. M., White, S. V., Kilborn, V., Holwerda, B. W., Hopkins, A. M., Brough, S., Pimbblet, K. A., Driver, S. P., & Kuijken, K. (2022). The Detection of a Massive Chain of Dark H i Clouds in the GAMA G23 Field. The Astrophysical journal, 926(2), Article 167. https://doi.org/10.3847/1538-4357/ac402b

We report on the detection of a large, extended H i cloud complex in the Galaxy and Mass Survey G23 field, located at a redshift of z ∼0.03, observed as part of the MeerKAT Habitat of Galaxies Survey campaign (a pilot survey to explore the mosaicing... Read More about The Detection of a Massive Chain of Dark H i Clouds in the GAMA G23 Field.

The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design (2022)
Journal Article
Allison, J. R., Sadler, E. M., Amaral, A. D., An, T., Curran, S. J., Darling, J., Edge, A. C., Ellison, S. L., Emig, K. L., Gaensler, B. M., Garratt-Smithson, L., Glowacki, M., Grasha, K., Koribalski, B. S., Lagos, C. D. P., Lah, P., Mahony, E. K., Mao, S. A., Morganti, R., Moss, V. A., …Zwaan, M. A. (2022). The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design. Publications / Astronomical Society of Australia, 39, Article e010. https://doi.org/10.1017/pasa.2022.3

We describe the scientific goals and survey design of the First Large Absorption Survey in H i (FLASH), a wide field survey for 21-cm line absorption in neutral atomic hydrogen (H i) at intermediate cosmological redshifts. FLASH will be carried out w... Read More about The First Large Absorption Survey in H i (FLASH): I. Science goals and survey design.

Galaxy and mass assembly (GAMA): The merging potential of brightest group galaxies (2021)
Journal Article
Banks, K., Brough, S., Holwerda, B. W., Hopkins, A. M., López-Sánchez, R., Phillipps, S., Pimbblet, K. A., & Robotham, A. S. (2021). Galaxy and mass assembly (GAMA): The merging potential of brightest group galaxies. The Astrophysical journal, 921(1), 9. https://doi.org/10.3847/1538-4357/ac1c0a

Using a volume-limited sample of 550 groups from the Galaxy And Mass Assembly Galaxy Group Catalogue spanning the halo mass range 12.8 < log[Mh M?] < 14.2, we investigate the merging potential of central Brightest Group Galaxies (BGGs). We use spectr... Read More about Galaxy and mass assembly (GAMA): The merging potential of brightest group galaxies.

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