Dr DAVID MALTBY's Outputs (29)

No evidence for excess AGN activity in recently quenched massive galaxies at cosmic noon (2025)
Journal Article
Almaini, O., Wild, V., Maltby, D., Taylor, E., Rowlands, K., de Lisle, T., Alatalo, K., Harrold, J., Hewitt, G., Patil, P., & Skarbinski, M. (in press). No evidence for excess AGN activity in recently quenched massive galaxies at cosmic noon. Monthly Notices of the Royal Astronomical Society, https://doi.org/10.1093/mnras/staf659

We present an analysis of AGN activity within recently quenched massive galaxies at cosmic noon (𝑧 ∼ 2), using deep Chandra X-ray observations of the Ultra-Deep Survey (UDS) field. Our sample includes over 4000 massive galaxies (𝑀∗ > 10^10.5 M⊙) in t... Read More about No evidence for excess AGN activity in recently quenched massive galaxies at cosmic noon.

High-velocity outflows persist up to 1 Gyr after a starburst in recently quenched galaxies at z > 1 (2024)
Journal Article
Taylor, E., Maltby, D., Almaini, O., Merrifield, M., Wild, V., Rowlands, K., & Harrold, J. (2024). High-velocity outflows persist up to 1 Gyr after a starburst in recently quenched galaxies at z > 1. Monthly Notices of the Royal Astronomical Society, 535(2), 1684-1692. https://doi.org/10.1093/mnras/stae2463

High-velocity outflows are ubiquitous in star-forming galaxies at cosmic noon, but are not as common in passive galaxies at the same epoch. Using optical spectra of galaxies selected from the UKIDSS Ultra Deep Survey at z > 1, we perform a stacking a... Read More about High-velocity outflows persist up to 1 Gyr after a starburst in recently quenched galaxies at z > 1.

Increasing AGN sample completeness using long-term near-infrared variability (2024)
Journal Article
Green, K., Elmer, E., Maltby, D. T., Almaini, O., Merrifield, M., & Hartley, W. G. (2024). Increasing AGN sample completeness using long-term near-infrared variability. Monthly Notices of the Royal Astronomical Society, 531(2), 2551-2562. https://doi.org/10.1093/mnras/stae1322

In this work, we use 8 years of deep near-infrared imaging to select and study a new set of 601 active galaxies identified through long-term near-infrared (NIR) variability in the UKIDSS Ultra Deep Survey (UDS). These objects are compared to 710 X-ra... Read More about Increasing AGN sample completeness using long-term near-infrared variability.

The role of mass and environment in the build-up of the quenched galaxy population since cosmic noon (2023)
Journal Article
Taylor, E., Almaini, O., Merrifield, M., Maltby, D., Wild, V., Hartley, W. G., & Rowlands, K. (2023). The role of mass and environment in the build-up of the quenched galaxy population since cosmic noon. Monthly Notices of the Royal Astronomical Society, 522(2), 2297-2306. https://doi.org/10.1093/mnras/stad1098

We conduct the first study of how the relative quenching probability of galaxies depends on environment over the redshift range 0.5 < z < 3, using data from the UKIDSS Ultra-Deep Survey. By constructing the stellar mass functions for quiescent and po... Read More about The role of mass and environment in the build-up of the quenched galaxy population since cosmic noon.

Cosmic Evolution of the H2 Mass Density and the Epoch of Molecular Gas (2021)
Journal Article
Garratt, T. K., Coppin, K. E., Geach, J. E., Almaini, O., Hartley, W. G., Maltby, D. T., Simpson, C. J., Wilkinson, A., Conselice, C. J., Franco, M., Ivison, R. J., Koprowski, M. P., Lovell, C. C., Pope, A., Scott, D., & Van Der Werf, P. (2021). Cosmic Evolution of the H2 Mass Density and the Epoch of Molecular Gas. Astrophysical Journal, 912(1), Article 62. https://doi.org/10.3847/1538-4357/abec81

We present new empirical constraints on the evolution of ρ H2, the cosmological mass density of molecular hydrogen, back to z ≈ 2.5. We employ a statistical approach measuring the average observed 850 μm flux density of near-infrared selected galaxie... Read More about Cosmic Evolution of the H2 Mass Density and the Epoch of Molecular Gas.

An ALMA survey of the SCUBA-2 CLS UDS field: Physical properties of 707 Sub-millimetre Galaxies (2020)
Journal Article
Dudzevičiūtė, U., Smail, I., Swinbank, A. M., Stach, S. M., Almaini, O., da Cunha, E., An, F. X., Arumugam, V., Birkin, J., Blain, A. W., Chapman, S. C., Chen, C.-C., Conselice, C. J., Coppin, K. E. K., Dunlop, J. S., Farrah, D., Geach, J. E., Gullberg, B., Hartley, W. G., Hodge, J. A., …van der Werf, P. (2020). An ALMA survey of the SCUBA-2 CLS UDS field: Physical properties of 707 Sub-millimetre Galaxies. Monthly Notices of the Royal Astronomical Society, 494(3), 3828–3860. https://doi.org/10.1093/mnras/staa769

The clustering of X-ray AGN at 0.5 < z < 4.5: host galaxies dictate dark matter halo mass (2020)
Journal Article
Krishnan, C., Almaini, O., Hatch, N. A., Wilkinson, A., Maltby, D. T., Conselice, C. J., Kocevski, D., Suh, H., & Wild, V. (2020). The clustering of X-ray AGN at 0.5 < z < 4.5: host galaxies dictate dark matter halo mass. Monthly Notices of the Royal Astronomical Society, 492(4), 4927–4944. https://doi.org/10.1093/mnras/staa815

We analyse 870 μm Atacama Large Millimetre Array (ALMA) dust continuum detections of 41 canonically selected z ≃ 3 Lyman-break galaxies (LBGs), as well as 209 ALMA-undetected LBGs, in follow-up of SCUBA-2 mapping of the UKIDSS Ultra Deep Survey (UDS)... Read More about The clustering of X-ray AGN at 0.5 < z < 4.5: host galaxies dictate dark matter halo mass.

The star formation histories of z∼1 post-starburst galaxies (2020)
Journal Article
Wild, V., Aldeen, L. T., Carnall, A., Maltby, D., Almaini, O., Werle, A., Wilkinson, A., Rowlands, K., Bolzonella, M., Castellano, M., Gargiulo, A., McLure, R., Pentericci, L., & Pozzetti, L. (2020). The star formation histories of z∼1 post-starburst galaxies. Monthly Notices of the Royal Astronomical Society, 494(1), 529–548. https://doi.org/10.1093/mnras/staa674

We present the star formation histories of 39 galaxies with high-quality rest-frame optical spectra at 0.5 < z < 1.3 selected to have strong Balmer absorption lines and/or Balmer break, and compare to a sample of spectroscopically selected quiescent... Read More about The star formation histories of z∼1 post-starburst galaxies.

Long-term NIR Variability in the UKIDSS Ultra Deep Survey: a new probe of AGN activity at high redshift (2020)
Journal Article
Elmer, E., Almaini, O., Merrifield, M., Hartley, W. G., Maltby, D. T., Lawrence, A., Botti, I., & Hirst, P. (2020). Long-term NIR Variability in the UKIDSS Ultra Deep Survey: a new probe of AGN activity at high redshift. Monthly Notices of the Royal Astronomical Society, 493(2), 3026-3035. https://doi.org/10.1093/mnras/staa381

We present the first attempt to select active galactic nuclei (AGN) using long-Term near-infrared (NIR) variability. By analysing the K-band light curves of all the galaxies in the UKIRT Infrared Deep Sky Survey (UKIDSS) Ultra Deep Survey, the deepes... Read More about Long-term NIR Variability in the UKIDSS Ultra Deep Survey: a new probe of AGN activity at high redshift.

An ALMA survey of the SCUBA-2 cosmology legacy survey UKIDSS/UDS field: Dust attenuation in high-redshift Lyman-break galaxies (2020)
Journal Article
Koprowski, M. P., Coppin, K. E. K., E. Geach, J., Dudzevičiūtė, U., Smail, I., Almaini, O., An, F., Blain, A. W., Chapman, S. C., Chen, C.-C., Conselice, C. J., Dunlop, J. S., Farrah, D., Gullberg, B., Hartley, W., Ivison, R. J., Karska, A., Maltby, D., MaÅek, K., Michałowski, M. J., …Whitaker, K. E. (2020). An ALMA survey of the SCUBA-2 cosmology legacy survey UKIDSS/UDS field: Dust attenuation in high-redshift Lyman-break galaxies. Monthly Notices of the Royal Astronomical Society, 492(4), 4927-4944. https://doi.org/10.1093/MNRAS/STAA160

© 2020 Oxford University Press. All rights reserved. We analyse 870 ∼m Atacama Large Millimetre Array (ALMA) dust continuum detections of 41 canonically selected z3 Lyman-break galaxies (LBGs), aswell as 209 ALMA-undetected LBGs, in follow-up of SCUB... Read More about An ALMA survey of the SCUBA-2 cosmology legacy survey UKIDSS/UDS field: Dust attenuation in high-redshift Lyman-break galaxies.

An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: High-resolution dust continuum morphologies and the link between sub-millimetre galaxies and spheroid formation (2019)
Journal Article
Gullberg, B., Smail, I., Swinbank, A. M., Dudzevičiūtė, U., Stach, S. M., Thomson, A. P., Almaini, O., Chen, C. C., Conselice, C., Cooke, E. A., Farrah, D., Ivison, R. J., Maltby, D., Michałowski, M. J., Simpson, J. M., Scott, D., Wardlow, J. L., & Weiss, A. (2019). An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: High-resolution dust continuum morphologies and the link between sub-millimetre galaxies and spheroid formation. Monthly Notices of the Royal Astronomical Society, 490(4), 4956-4974. https://doi.org/10.1093/mnras/stz2835

© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society We present an analysis of the morphology and profiles of the dust continuum emission in 153 bright sub-millimetre galaxies (SMGs) detected with ALMA... Read More about An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: High-resolution dust continuum morphologies and the link between sub-millimetre galaxies and spheroid formation.

Radio Spectra and Sizes of Atacama Large Millimeter/submillimeter Array-identified Submillimeter Galaxies: Evidence of Age-related Spectral Curvature and Cosmic-Ray Diffusion? (2019)
Journal Article
Thomson, A. P., Smail, I., Swinbank, A. M., Simpson, J. M., Arumugam, V., Stach, S., Murphy, E. J., Rujopakarn, W., Almaini, O., An, F., Blain, A. W., Chen, C. C., Cooke, E. A., Dudzevičiūtė, U., Edge, A. C., Farrah, D., Gullberg, B., Hartley, W., Ibar, E., Maltby, D., …Wardlow, J. L. (2019). Radio Spectra and Sizes of Atacama Large Millimeter/submillimeter Array-identified Submillimeter Galaxies: Evidence of Age-related Spectral Curvature and Cosmic-Ray Diffusion?. Astrophysical Journal, 883(2), Article 204. https://doi.org/10.3847/1538-4357/ab32e7

© 2019 The American Astronomical Society. All rights reserved. We analyze the multifrequency radio spectral properties of 41 6 GHz-detected Atacama Large Millimeter/submillimeter Array (ALMA)-identified, submillimeter galaxies (SMGs), observed at 610... Read More about Radio Spectra and Sizes of Atacama Large Millimeter/submillimeter Array-identified Submillimeter Galaxies: Evidence of Age-related Spectral Curvature and Cosmic-Ray Diffusion?.

High-velocity outflows in massive post-starburst galaxies at z > 1 (2019)
Journal Article
Maltby, D. T., Almaini, O., McLure, R. J., Wild, V., Dunlop, J., Rowlands, K., Hartley, W. G., Hatch, N. A., Socolovsky, M., Wilkinson, A., Amorin, R., Bradshaw, E. J., Carnall, A. C., Castellano, M., Cimatti, A., Cresci, G., Cullen, F., De Barros, S., Fontanot, F., Garilli, B., …Talia, M. (2019). High-velocity outflows in massive post-starburst galaxies at z > 1. Monthly Notices of the Royal Astronomical Society, 489(1), 1139-1151. https://doi.org/10.1093/mnras/stz2211

We investigate the prevalence of galactic-scale outflows in post-starburst (PSB) galaxies at high redshift (1 < z < 1.4), using the deep optical spectra available in the UKIDSS Ultra Deep Survey (UDS). We use a sample of ∼40 spectroscopically confirm... Read More about High-velocity outflows in massive post-starburst galaxies at z > 1.

Compact star-forming galaxies preferentially quenched to become PSBs in z < 1 clusters (2018)
Journal Article
Socolovsky, M., Maltby, D. T., Hatch, N. A., Almaini, O., Wild, V., Hartley, W. G., Simpson, C., & Rowlands, K. (2019). Compact star-forming galaxies preferentially quenched to become PSBs in z < 1 clusters. Monthly Notices of the Royal Astronomical Society, 482(2), 1640-1650. https://doi.org/10.1093/mnras/sty2840

© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. We analyse the structure of galaxies with high specific star formation rate (SSFR) in cluster and field environments in the redshift range 0.5 < z... Read More about Compact star-forming galaxies preferentially quenched to become PSBs in z < 1 clusters.

A machine-learning method for identifying multiwavelength counterparts of submillimeter galaxies: training and testing using AS2UDS and ALESS (2018)
Journal Article
An, F. X., Stach, S., Smail, I., Swinbank, A., Almaini, O., Simpson, C., Hartley, W., Maltby, D., Ivison, R., Arumugam, V., Wardlow, J., Cooke, E., Gullberg, B., Thomson, A., Chen, C.-C., Simpson, J., Geach, J., Scott, D., Dunlop, J., Farrah, D., …Coppin, K. (2018). A machine-learning method for identifying multiwavelength counterparts of submillimeter galaxies: training and testing using AS2UDS and ALESS. Astrophysical Journal, 862(2), Article 101. https://doi.org/10.3847/1538-4357/aacdaa

We describe the application of supervised machine-learning algorithms to identify the likely multiwavelength counterparts to submillimeter sources detected in panoramic, single-dish submillimeter surveys. As a training set, we employ a sample of 695... Read More about A machine-learning method for identifying multiwavelength counterparts of submillimeter galaxies: training and testing using AS2UDS and ALESS.

An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters (2018)
Journal Article
Cooke, E., Smail, I., Swinbank, A., Stach, S., An, F. X., Gullberg, B., Almaini, O., Simpson, C., Wardlow, J., Blain, A., Chapman, S., Chen, C.-C., Conselice, C., Coppin, K., Farrah, D., Maltby, D., Michałowski, M., Scott, D., Simpson, J., Thomson, A., & Werf, P. V. D. (2018). An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters. Astrophysical Journal, 861(2), https://doi.org/10.3847/1538-4357/aac6ba

We report the results of a search for serendipitous [C ii] 157.74 μm emitters at z sime 4.4–4.7 using the Atacama Large Millimeter/submillimeter Array (ALMA). The search exploits the AS2UDS continuum survey, which covers ~50 arcmin2 of the sky toward... Read More about An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: identifying candidate z∼4.5[CII] emitters.

The structure of post-starburst galaxies at 0.5 < z < 2: evidence for two distinct quenching routes at different epochs (2018)
Journal Article
Maltby, D. T., Almaini, O., Wild, V., Hatch, N. A., Hartley, W. G., Simpson, C., Rowlands, K., & Socolovsky, M. (2018). The structure of post-starburst galaxies at 0.5 < z < 2: evidence for two distinct quenching routes at different epochs. Monthly Notices of the Royal Astronomical Society, 480(1), 381-401. https://doi.org/10.1093/mnras/sty1794

We present an analysis of the structure of post-starburst (PSB) galaxies in the redshift range 0.5 less than z less than 2, using a photometrically selected sample identified in the Ultra Deep Survey field. We examine the structure of ∼80 of t... Read More about The structure of post-starburst galaxies at 0.5 < z < 2: evidence for two distinct quenching routes at different epochs.

The VANDELS ESO public spectroscopic survey (2018)
Journal Article
McLure, R., Pentericci, L., Cimatti, A., Dunlop, J., Elbaz, D., Fontana, A., Nandra, K., Amorin, R., Bolzonella, M., Bongiorno, A., Carnall, A., Castellano, M., Cirasuolo, M., Cucciati, O., Cullen, F., De Barros, S., Finkelstein, S., Fontanot, F., Franzetti, P., Fumana, M., …Zucca, E. (2018). The VANDELS ESO public spectroscopic survey. Monthly Notices of the Royal Astronomical Society, 479(1), https://doi.org/10.1093/mnras/sty1213

VANDELS is a uniquely deep spectroscopic survey of high-redshift galaxies with the VIMOS spectrograph on ESO’s Very Large Telescope (VLT). The survey has obtained ultradeep optical (0.48 < λ < 1.0 μm) spectroscopy of ≃2100 galaxies within the redshif... Read More about The VANDELS ESO public spectroscopic survey.

The enhancement of rapidly quenched galaxies in distant clusters at 0.5 < z < 1.0 (2018)
Journal Article
Socolovsky, M., Almaini, O., Hatch, N. A., Wild, V., Maltby, D. T., Hartley, W. G., & Simpson, C. (2018). The enhancement of rapidly quenched galaxies in distant clusters at 0.5 < z < 1.0. Monthly Notices of the Royal Astronomical Society, 476(1), https://doi.org/10.1093/mnras/sty312

We investigate the relationship between environment and galaxy evolution in the redshift range $0.5<z<1.0$. Galaxy overdensities are selected using a Friends-of-Friends algorithm, applied to deep photometric data in the Ultra-Deep Survey (UDS) field...

Massive post-starburst galaxies at z > 1 are compact proto-spheroids (2018)
Preprint / Working Paper
Almaini, O., Wild, V., Maltby, D. T., Hartley, W. G., Simpson, C., Hatch, N. A., McLure, R. J., Dunlop, J. S., & Rowlands, K. Massive post-starburst galaxies at z > 1 are compact proto-spheroids

We investigate the relationship between the quenching of star formation and the structural transformation of massive galaxies, using a large sample of photometrically-selected post-starburst galaxies in the UKIDSS UDS field. We find that post-starbur... Read More about Massive post-starburst galaxies at z > 1 are compact proto-spheroids.