Article
Astronomy & Astrophysics
Jacob Maresca, Simon Dye, Aristeidis Amvrosiadis, George Bendo, Asantha Cooray, Gianfranco De Zotti, Loretta Dunne, Stephen Eales, Cristina Furlanetto, Joaquin Gonzalez-Nuevo, Michael Greener, Robert Ivison, Andrea Lapi, Mattia Negrello, Dominik Riechers, Stephen Serjeant, Monica Tergolina, Julie Wardlow
Summary: In this paper, we present modelling of high-resolution imaging of seven strong gravitationally lensed galaxies using ALMA. By careful modelling of visibilities, we determine the mass profiles of the lensing galaxies and investigate the intrinsic properties and morphologies of the lensed submillimetre sources.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jacob Maresca, Simon Dye, Nan Li
Summary: This study examines a method using a Convolutional Neural Network to analyze lens modeling and source reconstruction, showcasing a significant reduction in unphysical source reconstructions by reinitializing the models based on CNN predictions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
James Pearson, Jacob Maresca, Nan Li, Simon Dye
Summary: The study trains a CNN to predict mass profile parameters of galaxy-galaxy gravitational lenses, with significantly lower errors compared to traditional methods, especially when incorporating uncertainties predicted by the CNN. Combining neural networks with conventional techniques can greatly improve accuracy and speed in automated modelling.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Zhang, Q. Yuan, J-Y Liu, L. Zhang
Summary: This study reinvestigates the gravitational lens B1152+199 in the Cosmic Lens All-Sky Survey using archived Hubble Space Telescope (HST) data and Very Long Baseline Interferometry (VLBI) data. The results show a consistent luminosity ratio between the host galaxy and the X-galaxy, indicating a mass ratio of around 2. By modeling the dual-lens system using constraints from VLBI-resolved jet components and HST images, it is found that the X-galaxy plays a crucial role in the lens system. The optimized models from radio constraints successfully reproduce the observed features in the HST images.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Lyne Van de Vyvere, Matthew R. Gomer, Dominique Sluse, Dandan Xu, Simon Birrer, Aymeric Galan, Georgios Vernardos
Summary: In the study of gravitational lensing, the impact of azimuthal structures on extended images of the source and H-0 inference has not been characterized. This study addresses this gap by creating mock images with multipolar components and exploring the detectability of image deformation and its impact on H-0 inference. The results show that multipole deformations are detectable and can introduce small changes to the time-delays, but their impact on H-0 inference is generally minimal.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Enrico Laudato, Vincenzo Salzano, Keiichi Umetsu
Summary: In this work, an extended theory of gravity with additional scalar degrees of freedom is considered. The model is tested as a description of dark energy and also as a description of both dark matter and dark energy. The results show that the model is favored over general relativity for the description of dark energy, but disfavored for the scenario where gravity acts as both dark matter and dark energy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. Niemiec, M. Jauzac, D. Eckert, D. Lagattuta, K. Sharon, A. M. Koekemoer, K. Umetsu, A. Acebron, J. M. Diego, D. Harvey, E. Jullo, V Kokorev, M. Limousin, G. Mahler, P. Natarajan, M. Nonino, C. Steinhardt, S- Tam, A. Zitrin
Summary: The study presents a combined strong and weak lensing analysis of the Abell 370 cluster using the HST BUFFALO program. Seven candidate substructures were identified and evaluated for their physical significance. Five of these candidates were found to be reliable, and the mass distribution in Abell 370 was observed to extend along the north-west and south-east directions. This research provides new insights into the complex mass distribution of clusters at large cluster-centric radii.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
C. M. O'Riordan, S. J. Warren, D. J. Mortlock
Summary: When modelling strong gravitational lenses, the widely used singular power-law model for mass profile may not be flexible enough for accurate work. A more adaptable model, the elliptical 2DBPL model, is derived to better represent the lensing properties. The study shows that the slope of the mass profile interior to the images can be accurately recovered for lenses of moderate ellipticity, contrary to the common notion.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Joseph M. I. I. Fabritius II, Evan J. Arena, David M. Goldberg
Summary: The study found that galaxies with characteristics of early-type galaxies have lower intrinsic scatter in flexion signal, while late-type galaxies have higher scatter. Using a new gravitational lensing code Lenser, the measured flexion noise can be reduced by more than a factor of two at both low and high redshifts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Joseph M. Fabritius, Evan J. Arena, David M. Goldberg
Summary: The study found that objects with characteristics consistent with early-type galaxies have lower intrinsic scatter in flexion signal, while late-type galaxies have higher scatter. The measured flexion noise can be reduced by more than a factor of two at both low and high redshifts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Song Huang, Alexie Leauthaud, Christopher Bradshaw, Andrew Hearin, Peter Behroozi, Johannes Lange, Jenny Greene, Joseph DeRose, Enia Xhakaj, Joshua S. Speagle
Summary: Using weak gravitational lensing data, this study explores the potential of different stellar mass estimates in tracing halo mass, and finds that different proxies have different effects on tracing halo mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ricardo Herbonnet, Adrian Crawford, Camille Avestruz, Elena Rasia, Carlo Giocoli, Massimo Meneghetti, Anja von Der Linden, Weiguang Cui, Gustavo Yepes
Summary: The shape and orientation of galaxy clusters play an important role in improving weak-lensing mass estimates.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
David Nagy, Miroslava Dessauges-Zavadsky, Johan Richard, Daniel Schaerer, Francoise Combes, Matteo Messa, John Chisholm
Summary: In this study, we investigated two strongly lensed galaxies in MACS J1206.2-0847 and Abell 0521 (A521) using observations from the Hubble Space Telescope (HST) and the Atacama Large Millimeter/submillimeter Array (ALMA). We found that the scale lengths in the Cosmic Snake arc are about 0.5 kpc-1.5 kpc, which are 3-10 times larger in the arc in A521. The radial profiles of the molecular gas mass (M-mol) surface density in these high-redshift galaxies are significantly offset, up to a factor of 20, compared to the profiles of their counterparts at z = 0.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Lei Zhang, Zhi-Yu Zhang, James W. Nightingale, Ze-Cheng Zou, Xiaoyue Cao, Chao-Wei Tsai, Chentao Yang, Yong Shi, Junzhi Wang, Dandan Xu, Ling-Rui Lin, Jing Zhou, Ran Li
Summary: The growth of supermassive black holes and their feedback on host galaxies are important for galaxy evolution, especially in the early Universe. However, it is difficult to resolve this feedback due to observational limitations. Gravitational lensing provides a powerful tool to separate emission from active galactic nuclei (AGNs) and host galaxies at high redshifts. In this study, a jet-like radio structure was discovered in a strongly lensed quasar, indicating the co-existence of feedback from the AGN by both wind and jet.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Xuheng Ding, Tommaso Treu, Simon Birrer, Adriano Agnello, Dominique Sluse, Chris Fassnacht, Matthew W. Auger, Kenneth C. Wong, Sherry H. Suyu, Takahiro Morishita, Cristian E. Rusu, Aymeric Galan
Summary: The study focuses on utilizing strongly lensed AGNs to explore the correlation between the mass of a supermassive black hole and the properties of its active host galaxy. Results are consistent with non-lensed AGNs studies, demonstrating the potential of extending research to higher redshifts using strongly lensed AGNs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
C. M. O'Riordan, S. J. Warren, D. J. Mortlock
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
R. C. Laithwaite, S. J. Warren
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
S. Berta, A. J. Young, P. Cox, R. Neri, B. M. Jones, A. J. Baker, A. Omont, L. Dunne, A. Carnero Rosell, L. Marchetti, M. Negrello, C. Yang, D. A. Riechers, H. Dannerbauer, I. Perez-Fournon, P. van der Werf, T. Bakx, R. J. Ivison, A. Beelen, V. Buat, A. Cooray, I. Cortzen, S. Dye, S. Eales, R. Gavazzi, A. I. Harris, C. N. Herrera, D. Hughes, S. Jin, M. Krips, G. Lagache, M. Lehnert, H. Messias, S. Serjeant, F. Stanley, S. Urquhart, C. Vlahakis, A. Weiss
Summary: By exploiting the sensitivity of the IRAM Northern Extended Millimeter Array (NOEMA) and processing large bandwidths, the study of the star forming galaxy H-ATLAS J131611.5 +281219 revealed important properties such as the morphology of molecular gas and dust. High angular resolution imaging provided insights into the molecular emission lines and dust continuum emission, with additional data from the Very Large Array and Hubble Space Telescope contributing to a better understanding of the galaxy's structure and dynamics.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
C. M. O'Riordan, S. J. Warren, D. J. Mortlock
Summary: When modelling strong gravitational lenses, the widely used singular power-law model for mass profile may not be flexible enough for accurate work. A more adaptable model, the elliptical 2DBPL model, is derived to better represent the lensing properties. The study shows that the slope of the mass profile interior to the images can be accurately recovered for lenses of moderate ellipticity, contrary to the common notion.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
R. Barnett, S. J. Warren, N. J. G. Cross, D. J. Mortlock, X. Fan, F. Wang, P. C. Hewett
Summary: This study presents the results of a new, deeper, and more comprehensive search for high-redshift 6.5 < z < 9.3 quasars using the data from the VISTA Kilo-Degree Infrared Galaxy (VIKING) survey. The Bayesian model comparison (BMC) selection method was used, resulting in a ranked list of candidates with significantly fewer false positives compared to other methods. The study also compares the BMC method with color cuts and minimum-chi(2) SED fitting, showing that BMC is more efficient in reducing false positives and reaching deeper magnitudes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Jacob Maresca, Simon Dye, Nan Li
Summary: This study examines a method using a Convolutional Neural Network to analyze lens modeling and source reconstruction, showcasing a significant reduction in unphysical source reconstructions by reinitializing the models based on CNN predictions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Nan Li, Christoph Becker, Simon Dye
Summary: This paper investigates the impact of line-of-sight structures on time-delay measurements in strong lensing systems and concludes that lens modelling must incorporate multiple-lens planes to accurately infer H-0.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
James Pearson, Jacob Maresca, Nan Li, Simon Dye
Summary: The study trains a CNN to predict mass profile parameters of galaxy-galaxy gravitational lenses, with significantly lower errors compared to traditional methods, especially when incorporating uncertainties predicted by the CNN. Combining neural networks with conventional techniques can greatly improve accuracy and speed in automated modelling.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. Dye, S. A. Eales, H. L. Gomez, G. C. Jones, M. W. L. Smith, E. Borsato, A. Moss, L. Dunne, J. Maresca, A. Amvrosiadis, M. Negrello, L. Marchetti, E. M. Corsini, R. J. Ivison, G. J. Bendo, T. Bakx, A. Cooray, P. Cox, H. Dannerbauer, S. Serjeant, D. Riechers, P. Temi, C. Vlahakis
Summary: We have conducted the first spatially resolved investigation of the multiphase interstellar medium (ISM) at high redshift, revealing a rotationally-supported gas disc and evidence of a nearby perturber in a strongly lensed submillimeter galaxy. Our estimations suggest the existence of a high-mass reservoir of cool gas that might have been missed in previous studies. The conflict between our mass estimates and dynamical mass estimates in the literature could be due to lower gas-to-tracer ratios in high-redshift galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. A. Urquhart, G. J. Bendo, S. Serjeant, T. Bakx, M. Hagimoto, P. Cox, R. Neri, M. Lehnert, C. Sedgwick, C. Weiner, H. Dannerbauer, A. Amvrosiadis, P. Andreani, A. J. Baker, A. Beelen, S. Berta, E. Borsato, V Buat, K. M. Butler, A. Cooray, G. De Zotti, L. Dunne, S. Dye, S. Eales, A. Enia, L. Fan, R. Gavazzi, J. Gonzalez-Nuevo, A. Harris, C. N. Herrera, D. Hughes, D. Ismail, R. Ivison, S. Jin, B. Jones, K. Kohno, M. Krips, G. Lagache, L. Marchetti, M. Massardi, H. Messias, M. Negrello, A. Omont, I Perez-Fournon, D. A. Riechers, D. Scott, M. W. L. Smith, F. Stanley, Y. Tamura, P. Temi, C. Vlahakis, A. Weiss, P. van der Werf, A. Verma, C. Yang, A. J. Young
Summary: This study presents spectroscopic measurements for 71 galaxies associated with 62 of the brightest high-redshift submillimetre sources. They obtained reliable redshift measurements for all sources using ALMA and the 12-m Array, and found that the CO(1-0) luminosity is significantly elevated relative to the line-width to CO(1-0) luminosity scaling relation, suggesting the presence of lensing magnification.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jacob Maresca, Simon Dye, Aristeidis Amvrosiadis, George Bendo, Asantha Cooray, Gianfranco De Zotti, Loretta Dunne, Stephen Eales, Cristina Furlanetto, Joaquin Gonzalez-Nuevo, Michael Greener, Robert Ivison, Andrea Lapi, Mattia Negrello, Dominik Riechers, Stephen Serjeant, Monica Tergolina, Julie Wardlow
Summary: In this paper, we present modelling of high-resolution imaging of seven strong gravitationally lensed galaxies using ALMA. By careful modelling of visibilities, we determine the mass profiles of the lensing galaxies and investigate the intrinsic properties and morphologies of the lensed submillimetre sources.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. J. Doherty, J. E. Geach, R. J. Ivison, K. M. Menten, A. M. Jacob, J. Forbrich, S. Dye
Summary: The detection of ground state rotational emission of ammonia in a gravitationally lensed star-bursting galaxy suggests that the gas responsible for NH3 emission is tracing the global molecular reservoir, with high density pockets. The ratio of NH3 emission to total infrared luminosity in this galaxy is comparable to that observed in star-forming regions in the Milky Way, indicating similarities in the nature of star formation between extreme starbursts in the early Universe and Galactic star-forming regions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
F. Stanley, B. M. Jones, D. A. Riechers, C. Yang, S. Berta, P. Cox, T. J. L. C. Bakx, A. Cooray, H. Dannerbauer, S. Dye, D. H. Hughes, R. J. Ivison, S. Jin, M. Lehnert, R. Neri, A. Omont, P. van der Werf, A. Weiss
Summary: We conducted a survey of CO(1-0) emission in 14 infrared luminous dusty star-forming galaxies (DSFGs) at 2 < z < 4 using the NSF's JVLA. All sources were detected in (CO)-C-12(1-0), with an angular resolution of about 1''. We measured CO luminosities and molecular gas masses, and based on radiative transfer modeling, determined densities and temperatures of the molecular gas. In addition, we found a wide range of CO spectral line energy distributions (SLEDs) and revealed the importance of CO(1-0) observations in combination with higher -J transitions.
ASTROPHYSICAL JOURNAL
(2023)
Article
Multidisciplinary Sciences
J. E. Geach, E. Lopez-Rodriguez, M. J. Doherty, Jianhang Chen, R. J. Ivison, G. J. Bendo, S. Dye, K. E. K. Coppin
Summary: This study reports the detection of linearly polarized thermal emission from dust grains in a strongly lensed and intrinsically luminous galaxy that is forming stars at a rate more than 1,000 times that of the Milky Way. The observations support the presence of a 5-kiloparsec-scale ordered magnetic field with a strength of around 500 μG or lower, oriented parallel to the molecular gas disk, indicating the rapid formation of such structures in galaxies early in cosmic history.
Article
Astronomy & Astrophysics
G. J. Bendo, S. A. Urquhart, S. Serjeant, T. Bakx, M. Hagimoto, P. Cox, R. Neri, M. D. Lehnert, H. Dannerbauer, A. Amvrosiadis, P. Andreani, A. J. Baker, A. Beelen, S. Berta, E. Borsato, V Buat, K. M. Butler, A. Cooray, G. De Zotti, L. Dunne, S. Dye, S. Eales, A. Enia, L. Fan, R. Gavazzi, J. Gonzalez-Nuevo, A. Harris, C. N. Herrera, D. H. Hughes, D. Ismail, B. M. Jones, K. Kohno, M. Krips, G. Lagache, L. Marchetti, M. Massardi, H. Messias, M. Negrello, A. Omont, I Perez-Fournon, D. A. Riechers, D. Scott, M. W. L. Smith, F. Stanley, Y. Tamura, P. Temi, P. van der Werf, A. Verma, C. Vlahakis, A. Weiss, C. Yang, A. J. Young
Summary: We present ALMA continuum images of 85 fields selected from Herschel observations. Most of the fields are expected to contain gravitationally lensed or hyperluminous infrared galaxies. We found that about half of the Herschel sources were resolved into multiple ALMA sources and the brightest Herschel sources corresponded to individual ALMA sources. The results suggest that the color temperatures of the sources do not vary significantly with redshift and the dust emissivity indices are largely consistent.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)