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Professor OMAR ALMAINI's Outputs (63)

The Cosmic Evolution Early Release Science Survey (CEERS) (2025)
Journal Article
Finkelstein, S. L., Bagley, M. B., Haro, P. A., Dickinson, M., Ferguson, H. C., Kartaltepe, J. S., Kocevski, D. D., Koekemoer, A. M., Lotz, J. M., Papovich, C., Pérez-González, P. G., Pirzkal, N., Somerville, R. S., Trump, J. R., Yang, G., Yung, L. Y. A., Fontana, A., Grazian, A., Grogin, N. A., Kewley, L. J., …Zavala, J. A. (in press). The Cosmic Evolution Early Release Science Survey (CEERS). Astrophysical Journal,

We present the Cosmic Evolution Early Release Science (CEERS) Survey, a 77.2 hour Director's Discretionary Early Release Science Program. CEERS demonstrates, tests, and validates efficient ex-tragalactic surveys using coordinated, overlapping paralle... Read More about The Cosmic Evolution Early Release Science Survey (CEERS).

The structure of massive star-forming galaxies from JWST and ALMA: Dusty, high-redshift disc galaxies (2024)
Journal Article
Gillman, S., Smail, I., Gullberg, B., Swinbank, A., Vijayan, A. P., Lee, M., Brammer, G., Dudzeviciute, U., Greve, T. R., Almaini, O., Brinch, M., Chapman, S. C., Chen, C.-C., Ikarashi, S., Matsuda, Y., Wang, W.-H., Walter, F., & van der Werf, P. P. (2024). The structure of massive star-forming galaxies from JWST and ALMA: Dusty, high-redshift disc galaxies. Astronomy and Astrophysics, 691, Article A299

We present an analysis of the JWST NIRCam and MIRI morphological and structural properties of 80 massive (log10(M∗[M]) = 11.2 ± 0.1) dusty star-forming galaxies at z = 2.7+1.2 −0.7 , identified as sub-millimetre galaxies (SMGs) by ALMA, that have bee... Read More about The structure of massive star-forming galaxies from JWST and ALMA: Dusty, high-redshift disc galaxies.

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.

The JWST EXCELS survey: Too much, too young, too fast? Ultra-massive quiescent galaxies at 3 < z < 5 (2024)
Journal Article
Carnall, A. C., Cullen, F., Mclure, R. J., Mcleod, D. J., Begley, R., Donnan, C. T., Dunlop, J. S., Shapley, A. E., Rowlands, K., Almaini, O., Arellano-Córdova, K. Z., Barrufet, L., Cimatti, A., Ellis, R. S., Grogin, N. A., Hamadouche, M. L., Illingworth, G. D., Koekemoer, A. M., Leung, H.-H., Lovell, C. C., …Wild, V. (2024). The JWST EXCELS survey: Too much, too young, too fast? Ultra-massive quiescent galaxies at 3 < z < 5. Monthly Notices of the Royal Astronomical Society, 534(1), 325–348. https://doi.org/10.1093/mnras/stae2092

We report ultra-deep, medium-resolution spectroscopic observations for 4 quiescent galaxies with log 10 (M * /M ⊙) > 11 at 3 < z < 5. These data were obtained with JWST NIRSpec as part of the Early eXtragalactic Continuum and Emission Line Science (E... Read More about The JWST EXCELS survey: Too much, too young, too fast? Ultra-massive quiescent galaxies at 3 < z < 5.

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.

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. (2024). Correcting for the overabundance of low-mass quiescent galaxies in semi-analytic models. Monthly Notices of the Royal Astronomical Society: Letters, 532(1), L61-L66. 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., Fernández, V., Papovich, C., Nicholls, D. C., Kewley, L. J., Brunker, S. W., Salzer, J. J., Wilkins, S. M., Almaini, O., Bagley, M. B., Berg, D. A., Bhatawdekar, R., Bisigello, L., Buat, V., Burgarella, D., …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., Ciesla, L., Daddi, E., Dickinson, M., Ferguson, H. C., Franco, M., Jiménez-Andrade, E. F., Kartaltepe, J. S., Koekemoer, A. M., Le Bail, A., Murphy, E. J., Papovich, C., Tacchella, S., Wilkins, S. M., Aretxaga, I., …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., Papovich, C., Burgarella, D., Kocevski, D. D., Huertas-Company, M., Iyer, K. G., Koekemoer, A. M., Larson, R. L., Pérez-González, P. G., Rose, C., Tacchella, S., Wilkins, S. M., Chworowsky, K., Medrano, A., Morales, A. M., …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., 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 ${\rho }_{{{\rm{H}}}_{2}}$, 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.

The VANDELS ESO public spectroscopic survey: Final data release of 2087 spectra and spectroscopic measurements (2021)
Journal Article
Garilli, B., McLure, R., Pentericci, L., Franzetti, P., Gargiulo, A., Carnall, A., Cucciati, O., Iovino, A., Amorin, R., Bolzonella, M., Bongiorno, A., Castellano, M., Cimatti, A., Cirasuolo, M., Cullen, F., Dunlop, J., Elbaz, D., Finkelstein, S., Fontana, A., Fontanot, F., …Zucca, E. (2021). The VANDELS ESO public spectroscopic survey: Final data release of 2087 spectra and spectroscopic measurements. Astronomy and Astrophysics, 647, Article A150. https://doi.org/10.1051/0004-6361/202040059

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., Almaini, O., Birkin, J. E., Chen, C. C., Conselice, C. J., Cooke, E. A., Coppin, K. E. K., Dunlop, J. S., Farrah, D., Ikarashi, S., Ivison, R. J., & 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., Chen, C.-C., Geach, J. E., Gullberg, B., Hodge, J. A., Ikarashi, S., Ivison, R. J., Scott, D., Simpson, C., Swinbank, A. M., Thomson, A. P., Walter, F., Wardlow, J. L., & 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., Thomson, A. P., Almaini, O., Arumugam, V., Blain, A. W., Calistro-Rivera, G., Chapman, S. C., Chen, C.-C., da Cunha, E., Farrah, D., Leslie, S., Scott, D., van der Vlugt, D., Wardlow, J. L., & 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 μm 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 >4σ 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.

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.