Aristeidis Amvrosiadis' Outputs (23)

The onset of bar formation in a massive galaxy at z ∼ 3.8 (2025)
Journal Article
Amvrosiadis, A., Lange, S., Nightingale, J. W., He, Q., Frenk, C. S., Oman, K. A., Smail, I., Swinbank, A. M., Fragkoudi, F., Gadotti, D. A., Cole, S., Borsato, E., Robertson, A., Massey, R., Cao, X., & Li, R. (2025). The onset of bar formation in a massive galaxy at z ∼ 3.8. Monthly Notices of the Royal Astronomical Society, 537(2), 1163-1181. https://doi.org/10.1093/mnras/staf048

We examine the morphological and kinematical properties of SPT-2147, a strongly lensed, massive, dusty, star-forming galaxy at z = 3.762. Combining data from JWST, Hubble Space Telescope, and ALMA, we study the galaxy’s stellar emission, dust continu... Read More about The onset of bar formation in a massive galaxy at z ∼ 3.8.

The kinematics of massive high-redshift dusty star-forming galaxies (2024)
Journal Article
Amvrosiadis, A., Wardlow, J. L., Birkin, J. E., Smail, I., Swinbank, A. M., Nightingale, J., Bertoldi, F., Brandt, W. N., Casey, C. M., Chapman, S. C., Chen, C. C., Cox, P., da Cunha, E., Dannerbauer, H., Dudzevičiūte, U., Gullberg, B., Hodge, J. A., Knudsen, K. K., Menten, K., Walter, F., & van der Werf, P. (2025). The kinematics of massive high-redshift dusty star-forming galaxies. Monthly Notices of the Royal Astronomical Society, 536(4), 3757-3783. https://doi.org/10.1093/mnras/stae2760

We present a new method for modelling the kinematics of galaxies from interferometric observations by performing the optimization of the kinematic model parameters directly in visibility space instead of the conventional approach of fitting velocity... Read More about The kinematics of massive high-redshift dusty star-forming galaxies.

A novel high-z submm galaxy efficient line survey in ALMA bands 3 through 8 - an ANGELS pilot (2024)
Journal Article
Bakx, T. J. L. C., Amvrosiadis, A., Bendo, G. J., Algera, H. S. B., Serjeant, S., Bonavera, L., Borsato, E., Chen, X., Cox, P., González-Nuevo, J., Hagimoto, M., Harrington, K. C., Ivison, R. J., Kamieneski, P., Marchetti, L., Riechers, D. A., Tsukui, T., van der Werf, P. P., Yang, C., Zavala, J. A., …Urquhart, S. A. (2024). A novel high-z submm galaxy efficient line survey in ALMA bands 3 through 8 - an ANGELS pilot. Monthly Notices of the Royal Astronomical Society, 535(2), 1533-1574. https://doi.org/10.1093/mnras/stae2409

We use the Atacama Large sub/Millimetre Array (ALMA) to efficiently observe spectral lines across Bands 3, 4, 5, 6, 7, and 8 at high-resolution (0.″5 – 0.″1) for 16 bright southern Herschel sources at 1.5 < z < 4.2. With only six and a half hou... Read More about A novel high-z submm galaxy efficient line survey in ALMA bands 3 through 8 - an ANGELS pilot.

Unveiling lens light complexity with a novel multi-Gaussian expansion approach for strong gravitational lensing (2024)
Journal Article
He, Q., Nightingale, J. W., Amvrosiadis, A., Robertson, A., Cole, S., Frenk, C. S., Massey, R., Li, R., Cao, X., Lange, S. C., & França, J. P. C. (2024). Unveiling lens light complexity with a novel multi-Gaussian expansion approach for strong gravitational lensing. Monthly Notices of the Royal Astronomical Society, 532(2), 2441-2462. https://doi.org/10.1093/mnras/stae1577

In a strong gravitational lensing system, the distorted light from a source is analysed to infer the properties of the lens. However, light emitted by the lens itself can contaminate the image of the source, introducing systematic errors in the analy... Read More about Unveiling lens light complexity with a novel multi-Gaussian expansion approach for strong gravitational lensing.

The COSMOS-Web ring: In-depth characterization of an Einstein ring lensing system at z ∼ 2 (2024)
Journal Article
Mercier, W., Shuntov, M., Gavazzi, R., Nightingale, J. W., Arango, R., Ilbert, O., Amvrosiadis, A., Ciesla, L., Casey, C. M., Jin, S., Faisst, A. L., Andika, I. T., Drakos, N. E., Enia, A., Franco, M., Gillman, S., Gozaliasl, G., Hayward, C. C., Huertas-Company, M., Kartaltepe, J. S., …Vijayan, A. P. (2024). The COSMOS-Web ring: In-depth characterization of an Einstein ring lensing system at z ∼ 2. Astronomy & Astrophysics, 687, Article A61. https://doi.org/10.1051/0004-6361/202348095

Aims. We provide an in-depth analysis of the COSMOS-Web ring, an Einstein ring at z ≈ 2 that we serendipitously discovered during the data reduction of the COSMOS-Web survey and that could be the most distant lens discovered to date.

Methods. We e... Read More about The COSMOS-Web ring: In-depth characterization of an Einstein ring lensing system at z ∼ 2.

Strong gravitational lensing’s ‘external shear’ is not shear (2024)
Journal Article
Etherington, A., Nightingale, J., Massey, R., Tam, S.-I., Cao, X., Niemiec, A., He, Q., Robertson, A., Li, R., Amvrosiadis, A., Cole, S., Diego, J., Frenk, C., Frye, B., Harvey, D., Jauzac, M., Koekemoer, A., Lagattuta, D., Lange, S., Limousin, M., …Steinhardt, C. (2024). Strong gravitational lensing’s ‘external shear’ is not shear. Monthly Notices of the Royal Astronomical Society, 531(3), 3684-3697. https://doi.org/10.1093/mnras/stae1375

The distribution of mass in galaxy-scale strong gravitational lenses is often modelled as an elliptical power-law plus ‘external shear’, which notionally accounts for neighbouring galaxies and cosmic shear along our line of sight. A small amount of e... Read More about Strong gravitational lensing’s ‘external shear’ is not shear.

FLASH: Faint Lenses from Associated Selection with Herschel (2023)
Journal Article
Bakx, T. J. L. C., Gray, B. S., González-Nuevo, J., Bonavera, L., Amvrosiadis, A., Eales, S., …Serjeant, S. (2023). FLASH: Faint Lenses from Associated Selection with Herschel. Monthly Notices of the Royal Astronomical Society, 527(3), 8865-8885. https://doi.org/10.1093/mnras/stad3759

We report the ALMA Band 7 observations of 86 Herschel sources that likely contain gravitationally lensed galaxies. These sources are selected with relatively faint 500 μm flux densities between 15 and 85 mJy in an effort to characterize the effect of... Read More about FLASH: Faint Lenses from Associated Selection with Herschel.

Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses (2023)
Journal Article
Nightingale, J. W., He, Q., Cao, X., Amvrosiadis, A., Etherington, A., Frenk, C. S., Hayes, R. G., Robertson, A., Cole, S., Lange, S., Li, R., & Massey, R. (2024). Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses. Monthly Notices of the Royal Astronomical Society, 527(4), 10480-10506. https://doi.org/10.1093/mnras/stad3694

The cold dark matter (DM) model predicts that every galaxy contains thousands of DM subhaloes; almost all other DM models include a physical process that smooths away the subhaloes. The subhaloes are invisible, but could be detected via strong gravit... Read More about Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses.

Characterization of Herschel-selected strong lens candidates through HST and sub-mm/mm observations (2023)
Journal Article
Borsato, E., Marchetti, L., Negrello, M., Corsini, E. M., Wake, D., Amvrosiadis, A., …Young, A. (2024). Characterization of Herschel-selected strong lens candidates through HST and sub-mm/mm observations. Monthly Notices of the Royal Astronomical Society, 528(4), 6222-6279. https://doi.org/10.1093/mnras/stad3381

We have carried out Hubble Space Telescope (HST) snapshot observations at 1.1 μm of 281 candidate strongly lensed galaxies identified in the wide-area extragalactic surveys conducted with the Herschel Space Observatory. Our candidates comprise system... Read More about Characterization of Herschel-selected strong lens candidates through HST and sub-mm/mm observations.

The bright extragalactic ALMA redshift survey (BEARS) – II. Millimetre photometry of gravitational lens candidates (2023)
Journal Article
Bendo, G. J., Urquhart, S. A., Serjeant, S., Bakx, T., Hagimoto, M., Cox, P., …Young, A. J. (2023). The bright extragalactic ALMA redshift survey (BEARS) – II. Millimetre photometry of gravitational lens candidates. Monthly Notices of the Royal Astronomical Society, 522(2), 2995-3017. https://doi.org/10.1093/mnras/stac3771

We present 101- and 151-GHz ALMA continuum images for 85 fields selected from Herschel observations that have 500-μm flux densities >80 mJy and 250–500-μm colours consistent with z > 2, most of which are expected to be gravitationally lensed or hyper... Read More about The bright extragalactic ALMA redshift survey (BEARS) – II. Millimetre photometry of gravitational lens candidates.

Abell 1201: detection of an ultramassive black hole in a strong gravitational lens (2023)
Journal Article
Nightingale, J., Smith, R. J., He, Q., O’Riordan, C. M., Kegerreis, J. A., Amvrosiadis, A., Edge, A. C., Etherington, A., Hayes, R. G., Kelly, A., Lucey, J. R., & Massey, R. J. (2023). Abell 1201: detection of an ultramassive black hole in a strong gravitational lens. Monthly Notices of the Royal Astronomical Society, 521(3), 3298-3322. https://doi.org/10.1093/mnras/stad587

Supermassive black holes (SMBHs) are a key catalyst of galaxy formation and evolution, leading to an observed correlation between SMBH mass MBH and host galaxy velocity dispersion σe. Outside the local Universe, measurements of MBH are usually only p... Read More about Abell 1201: detection of an ultramassive black hole in a strong gravitational lens.

Bright extragalactic ALMA redshift survey (BEARS) III: detailed study of emission lines from 71 Herschel targets (2023)
Journal Article
Hagimoto, M., Bakx, T. J. L. C., Serjeant, S., Bendo, G. J., Urquhart, S. A., Eales, S., …Young, A. J. (2023). Bright extragalactic ALMA redshift survey (BEARS) III: detailed study of emission lines from 71 Herschel targets. Monthly Notices of the Royal Astronomical Society, 521(4), 5508–5535. https://doi.org/10.1093/mnras/stad784

We analyse the molecular and atomic emission lines of 71 bright Herschel-selected galaxies between redshifts 1.4 and 4.6 detected by the Atacama Large Millimeter/submillimeter Array. These lines include a total of 156 CO, [C I], and H2O emission line... Read More about Bright extragalactic ALMA redshift survey (BEARS) III: detailed study of emission lines from 71 Herschel targets.

PyAutoGalaxy: Open-Source Multiwavelength Galaxy Structure & Morphology (2023)
Journal Article
Nightingale, J. W., Amvrosiadis, A., Hayes, R. G., He, Q., Etherington, A., Cao, X., Cole, S., Frawley, J., Frenk, C. S., Lange, S., Li, R., Massey, R. J., Negrello, M., & Robertson, A. (2023). PyAutoGalaxy: Open-Source Multiwavelength Galaxy Structure & Morphology. The Journal of Open Source Software, 8(81), Article 4475. https://doi.org/10.21105/joss.04475

Nearly a century ago, Edwin Hubble famously classified galaxies into three distinct groups: ellipticals, spirals and irregulars (Hubble, 1926). Today, by analysing millions of galaxies with advanced image processing techniques Astronomers have expand... Read More about PyAutoGalaxy: Open-Source Multiwavelength Galaxy Structure & Morphology.

Testing strong lensing subhalo detection with a cosmological simulation (2022)
Journal Article
He, Q., Nightingale, J., Robertson, A., Amvrosiadis, A., Cole, S., Frenk, C. S., Massey, R., Li, R., Amorisco, N. C., Metcalf, R. B., Cao, X., & Etherington, A. (2023). Testing strong lensing subhalo detection with a cosmological simulation. Monthly Notices of the Royal Astronomical Society, 518(1), 220-239. https://doi.org/10.1093/mnras/stac2779

Strong gravitational lensing offers a compelling test of the cold dark matter paradigm, as it allows for subhaloes with masses of ∼109 M⊙ and below to be detected. We test commonly-used techniques for detecting subhaloes superposed in images of stron... Read More about Testing strong lensing subhalo detection with a cosmological simulation.

Automated galaxy-galaxy strong lens modelling: No lens left behind (2022)
Journal Article
Etherington, A., Nightingale, J. W., Massey, R., Cao, X., Robertson, A., Amorisco, N. C., Amvrosiadis, A., Cole, S., Frenk, C. S., He, Q., Li, R., & Tam, S.-I. (2022). Automated galaxy-galaxy strong lens modelling: No lens left behind. Monthly Notices of the Royal Astronomical Society, 517(3), 3275-3302. https://doi.org/10.1093/mnras/stac2639

The distribution of dark and luminous matter can be mapped around galaxies that gravitationally lens background objects into arcs or Einstein rings. New surveys will soon observe hundreds of thousands of galaxy lenses, and current, labour-intensive a... Read More about Automated galaxy-galaxy strong lens modelling: No lens left behind.

Galaxy–galaxy strong lens perturbations: line-of-sight haloes versus lens subhaloes (2022)
Journal Article
He, Q., Li, R., Frenk, C. S., Nightingale, J., Cole, S., Amorisco, N. C., Massey, R., Robertson, A., Etherington, A., Amvrosiadis, A., & Cao, X. (2022). Galaxy–galaxy strong lens perturbations: line-of-sight haloes versus lens subhaloes. Monthly Notices of the Royal Astronomical Society, 512(4), 5862-5873. https://doi.org/10.1093/mnras/stac759

We rederive the number density of intervening line-of-sight haloes relative to lens subhaloes in galaxy-galaxy strong lensing observations, where these perturbers can generate detectable image fluctuations. Previous studies have calculated the detect... Read More about Galaxy–galaxy strong lens perturbations: line-of-sight haloes versus lens subhaloes.

Modelling high-resolution ALMA observations of strongly lensed dusty star-forming galaxies detected by Herschel (2022)
Journal Article
Maresca, J., Dye, S., Amvrosiadis, A., Bendo, G., Cooray, A., De Zotti, G., Dunne, L., Eales, S., Furlanetto, C., González-Nuevo, J., Greener, M., Ivison, R., Lapi, A., Negrello, M., Riechers, D., Serjeant, S., Tergolina, M., & Wardlow, J. (2022). Modelling high-resolution ALMA observations of strongly lensed dusty star-forming galaxies detected by Herschel. Monthly Notices of the Royal Astronomical Society, 512(2), 2426-2438. https://doi.org/10.1093/mnras/stac585

We present modelling of ∼0.1 arcsec resolution Atacama Large Millimetre/submillimetre Array imaging of seven strong gravitationally lensed galaxies detected by the Herschel Space Observatory. Four of these systems are galaxy–galaxy strong lenses, wit... Read More about Modelling high-resolution ALMA observations of strongly lensed dusty star-forming galaxies detected by Herschel.

Systematic Errors Induced by the Elliptical Power-law model in Galaxy–Galaxy Strong Lens Modeling (2022)
Journal Article
Cao, X., Li, R., Nightingale, J., Massey, R., Robertson, A., Frenk, C. S., Amvrosiadis, A., Amorisco, N. C., He, Q., Etherington, A., Cole, S., & Zhu, K. (2022). Systematic Errors Induced by the Elliptical Power-law model in Galaxy–Galaxy Strong Lens Modeling. Research in Astronomy and Astrophysics, 22(2), https://doi.org/10.1088/1674-4527/ac3f2b

The elliptical power-law (EPL) model of the mass in a galaxy is widely used in strong gravitational lensing analyses. However, the distribution of mass in real galaxies is more complex. We quantify the biases due to this model mismatch by simulating... Read More about Systematic Errors Induced by the Elliptical Power-law model in Galaxy–Galaxy Strong Lens Modeling.

A forward-modelling method to infer the dark matter particle mass from strong gravitational lenses (2022)
Journal Article
He, Q., Robertson, A., Nightingale, J., Cole, S., Frenk, C. S., Massey, R., Amvrosiadis, A., Li, R., Cao, X., & Etherington, A. (2022). A forward-modelling method to infer the dark matter particle mass from strong gravitational lenses. Monthly Notices of the Royal Astronomical Society, 511(2), 3046-3062. https://doi.org/10.1093/mnras/stac191

A fundamental prediction of the cold dark matter (CDM) model of structure formation is the existence of a vast population of dark matter haloes extending to subsolar masses. By contrast, other dark matter models, such as a warm thermal relic (WDM), p... Read More about A forward-modelling method to infer the dark matter particle mass from strong gravitational lenses.

A high-resolution investigation of the multiphase ISM in a galaxy during the first two billion years (2021)
Journal Article
Dye, S., Eales, S., Gomez, H., Jones, G., Smith, M., Borsato, E., Moss, A., Dunne, L., Maresca, J., Amvrosiadis, A., Negrello, M., Marchetti, L., Corsini, E., Ivison, R., Bendo, G., Bakx, T., Cooray, A., Cox, P., Dannerbauer, H., Serjeant, S., …Vlahakis, C. (2022). A high-resolution investigation of the multiphase ISM in a galaxy during the first two billion years. Monthly Notices of the Royal Astronomical Society, 510(3), 3734-3757. https://doi.org/10.1093/mnras/stab3569

We have carried out the first spatially resolved investigation of the multiphase interstellar medium (ISM) at high redshift, using the z = 4.24 strongly lensed submillimetre galaxy H-ATLASJ142413.9+022303 (ID141). We present high-resolution (down to... Read More about A high-resolution investigation of the multiphase ISM in a galaxy during the first two billion years.