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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, 1-12. 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.

Correcting for the overabundance of low-mass quiescent galaxies in semi-analytic models (2024)
Journal Article
Harrold, J. E., Almaini, O., Pearce, F. R., & Yates, R. M. (in press). Correcting for the overabundance of low-mass quiescent galaxies in semi-analytic models. Monthly Notices of the Royal Astronomical Society, https://doi.org/10.1093/mnrasl/slae043

We compare the L-Galaxies semi-analytic model to deep observational data from the UKIDSS Ultra Deep Survey (UDS) across the redshift range 0.5 < z < 3. We find that the overabundance of low-mass, passive galaxies at high redshifts in the model can be... Read More about Correcting for the overabundance of low-mass quiescent galaxies in semi-analytic models.

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.

The Physical Conditions of Emission-line Galaxies at Cosmic Dawn from JWST/NIRSpec Spectroscopy in the SMACS 0723 Early Release Observations (2023)
Journal Article
Trump, J. R., Haro, P. A., Simons, R. C., Backhaus, B. E., Amorín, R. O., Dickinson, M., …Zavala, J. A. (2023). The Physical Conditions of Emission-line Galaxies at Cosmic Dawn from JWST/NIRSpec Spectroscopy in the SMACS 0723 Early Release Observations. Astrophysical Journal, 945(1), Article 35. https://doi.org/10.3847/1538-4357/acba8a

We present rest-frame optical emission-line flux ratio measurements for five z > 5 galaxies observed by the James Webb Space Telescope Near-Infared Spectrograph (NIRSpec) in the SMACS 0723 Early Release Observations. We add several quality-control an... Read More about The Physical Conditions of Emission-line Galaxies at Cosmic Dawn from JWST/NIRSpec Spectroscopy in the SMACS 0723 Early Release Observations.

Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations (2023)
Journal Article
Zavala, J. A., Buat, V., Casey, C. M., Finkelstein, S. L., Burgarella, D., Bagley, M. B., …Wuyts, S. (2023). Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations. Astrophysical Journal Letters, 943(2), Article L9. https://doi.org/10.3847/2041-8213/acacfe

Lyman-break galaxy (LBG) candidates at z ≳ 10 are rapidly being identified in James Webb Space Telescope (JWST)/NIRCam observations. Due to the (redshifted) break produced by neutral hydrogen absorption of rest-frame UV photons, these sources are exp... Read More about Dusty Starbursts Masquerading as Ultra-high Redshift Galaxies in JWST CEERS Observations.

A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ∼ 12 Galaxy in Early JWST CEERS Imaging (2022)
Journal Article
Finkelstein, S. L., Bagley, M. B., Haro, P. A., Dickinson, M., Ferguson, H. C., Kartaltepe, J. S., …Zavala, J. A. (2022). A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ∼ 12 Galaxy in Early JWST CEERS Imaging. Astrophysical Journal Letters, 940(2), Article L55. https://doi.org/10.3847/2041-8213/ac966e

We report the discovery of a candidate galaxy with a photo-z of z ∼ 12 in the first epoch of the James Webb Space Telescope (JWST) Cosmic Evolution Early Release Science Survey. Following conservative selection criteria, we identify a source with a r... Read More about A Long Time Ago in a Galaxy Far, Far Away: A Candidate z ∼ 12 Galaxy in Early JWST CEERS Imaging.

Cosmic Evolution of the H2 Mass Density and the Epoch of Molecular Gas (2021)
Journal Article
Garratt, T. K., Coppin, K. E. K., Geach, J. E., Almaini, O., Hartley, W. G., Maltby, D. T., …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 ${\rho }_{{{\rm{H}}}_{2}}$, 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-inf... Read More about Cosmic Evolution of the H2 Mass Density and the Epoch of Molecular Gas.

An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: Halo masses for submillimetre galaxies (2021)
Journal Article
Stach, S. M., Smail, I., Amvrosiadis, A., Swinbank, A. M., Dudzevičiūtė, U., Geach, J. E., …Wardlow, J. L. (2021). An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: Halo masses for submillimetre galaxies. Monthly Notices of the Royal Astronomical Society, 504(1), 172-184. https://doi.org/10.1093/mnras/stab714

We present an analysis of the spatial clustering of a large sample of high-resolution, interferometically identified, submillimetre galaxies (SMGs). We measure the projected cross-correlation function of ?350 SMGs in the UKIDSS Ultra Deep-Survey Fiel... Read More about An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: Halo masses for submillimetre galaxies.

Infrared lags in the light curves of AGN measured using a deep survey (2021)
Journal Article
Elmer, E., Merrifield, M., Almaini, O., Hartley, W. G., & Maltby, D. T. (2021). Infrared lags in the light curves of AGN measured using a deep survey. Monthly Notices of the Royal Astronomical Society: Letters, 503(1), L47-L50. https://doi.org/10.1093/mnrasl/slab023

Information on the structure around active galactic nuclei (AGNs) has long been derived from measuring lags in their varying light output at different wavelengths. In principle, infrared data would reach to larger radii, potentially even probing repr... Read More about Infrared lags in the light curves of AGN measured using a deep survey.

An ALMA survey of the S2CLS UDS field: optically invisible submillimetre galaxies (2021)
Journal Article
Smail, I., Dudzevičiūtė, U., Stach, S. M., Almaini, O., Birkin, J. E., Chapman, S. C., …van der Werf, P. (2021). An ALMA survey of the S2CLS UDS field: optically invisible submillimetre galaxies. Monthly Notices of the Royal Astronomical Society, 502(3), 3426-3435. https://doi.org/10.1093/mnras/stab283

We analyse a robust sample of 30 near-infrared-faint (KAB > 25.3, 5σ) submillimetre galaxies (SMGs) selected from a 0.96 deg2 field to investigate their properties and the cause of their faintness in optical/near-infrared wavebands. Our analysis expl... Read More about An ALMA survey of the S2CLS UDS field: optically invisible submillimetre galaxies.

An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: The Far-infrared/Radio Correlation for High-redshift Dusty Star-forming Galaxies (2020)
Journal Article
Algera, H. S. B., Smail, I., Dudzevičiūtė, U., Swinbank, A. M., Stach, S., Hodge, J. A., …van der Werf, P. (2020). An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: The Far-infrared/Radio Correlation for High-redshift Dusty Star-forming Galaxies. Astrophysical Journal, 903(2), Article 138. https://doi.org/10.3847/1538-4357/abb77b

We study the radio properties of 706 submillimeter galaxies (SMGs) selected at 870 ?m with the Atacama Large Millimeter Array from the SCUBA-2 Cosmology Legacy Survey map of the Ultra Deep Survey field. We detect 273 SMGs at >4? in deep Karl G. Jansk... Read More about An ALMA Survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS Field: The Far-infrared/Radio Correlation for High-redshift Dusty Star-forming Galaxies.

The clustering of X-ray AGN at 0.5 &lt; z &lt; 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., …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 &lt; z &lt; 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., …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., …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., …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., …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., …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?.