Article
Astronomy & Astrophysics
Hamidreza Mahani, Akram Hasani Zonoozi, Hosein Haghi, Tereza Jerabkova, Pavel Kroupa, Steffen Mieske
Summary: By exploring different formation scenarios and assumptions regarding the IMF, it is found that the observed M/L-V ratios of UCDs can be explained by a varying IMF with density and metallicity. The majority of UCDs with elevated M/L-V ratios are suggested to have formed monolithically with significant remnant-mass components, while UCDs with lower M/L-V values may have formed from merged star cluster complexes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Jenifer S. Millard, Benedikt Diemer, Stephen A. Eales, Haley L. Gomez, Rosemary Beeston, Matthew W. L. Smith
Summary: Investigating galactic dust mass evolution through empirical methods and cosmological simulations reveals discrepancies between observed evolution and model predictions, possibly due to cosmic evolution in dust grain properties or limitations in the model, particularly in relation to the fast evolution of neutral gas content in galaxies in the simulation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
P. Bonfini, A. Zezas, M. L. N. Ashby, S. P. Willner, A. Maragkoudakis, K. Kouroumpatzakis, P. H. Sell, K. Kovlakas
Summary: The study uses the Star Formation Reference Survey to constrain the mass distribution in nearby star-forming galaxies and measure the integrated luminosity density and total stellar mass density. The results indicate that discs dominate the mass density budget and recent star formation primarily happened in massive systems within the discs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
L. Bisigello, C. Gruppioni, A. Feltre, F. Calura, F. Pozzi, C. Vignali, L. Barchiesi, G. Rodighiero, M. Negrello
Summary: This study aims to generate simulated catalogues based on Herschel IR luminosity functions of different galaxy populations to consider different populations of galaxies and active galactic nuclei (AGN) consistently. The proposed simulation tool allows for reproducing the number densities of infrared-detected galaxies and is in agreement with observational data from UV to far-IR wavelengths.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
O. B. Kauffmann, O. Ilbert, J. R. Weaver, H. J. McCracken, B. Milvang-Jensen, G. Brammer, I Davidzon, O. Le Fevre, D. Liu, B. Mobasher, A. Moneti, M. Shuntov, S. Toft, C. M. Casey, J. S. Dunlop, J. S. Kartaltepe, A. M. Koekemoer, D. B. Sanders, L. Tresse
Summary: This paper presents a new search for galaxies with redshifts greater than or equal to 7.5 using the COSMOS2020 photometric catalogues. The study explores the challenges of detecting galaxies during the reionisation epoch and utilizes deep imaging surveys to identify the brightest galaxies at high redshifts. The authors constructed catalogues covering an area of 1.4 deg(2) using UltraVISTA data, Spitzer/IRAC COSMOS images, and Hyper-Suprime-Cam Subaru Strategic Program data. They identified new candidate sources as well as confirmed previously published candidates. By comparing different photometric redshift estimates, the authors tested the reliability of their candidates. The study also examined the evolution of the galaxy UV luminosity function in three redshift bins centered at z = 8, 9, and 10.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Manda Banerji, Gareth C. Jones, Stefano Carniani, Colin DeGraf, Jeff Wagg
Summary: Sub-arcsecond resolution imaging of CO(3-2) emission in two z similar to 2.5 heavily reddened quasars revealed significantly different host galaxy properties and local environments, as well as varying molecular gas fractions and host galaxy dynamical masses. The two quasars displayed distinct features despite having similar black hole properties, with one showing very massive host galaxies and low molecular gas fractions, while the other exhibited a high molecular gas fraction in a major merger scenario. The study also used Illustris simulations to track the growth of massive black holes from z similar to 6 to present day, highlighting discrepancies between observed black hole sizes and host galaxy properties.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. M. Stach, I Smail, A. Amvrosiadis, A. M. Swinbank, U. Dudzeviciute, J. E. Geach, O. Almaini, J. E. Birkin, Chian-Chou Chen, C. J. Conselice, E. A. Cooke, K. E. K. Coppin, J. S. Dunlop, D. Farrah, S. Ikarashi, R. J. Ivison, J. L. Wardlow
Summary: This study presents an analysis of the spatial clustering of a large sample of high-resolution submillimeter galaxies (SMGs), measuring their absolute linear bias and deriving their halo masses. The research predicts the evolution and future halo masses of the SMGs, as well as compares the efficiency of converting gas reservoirs into stars between SMGs and other systems. The findings suggest that the unique properties of SMGs are a result of them being the most massive galaxies still capable of accreting cool gas from their surroundings.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Matteo Bonato, Isabella Prandoni, Gianfranco De Zotti, Marisa Brienza, Raffaella Morganti, Mattia Vaccari
Summary: This study classified sources in the Lockman Hole field into radio loud (RL) AGNs, star-forming galaxies (SFGs), and radio quiet (RQ) AGNs based on multi-band information. The results show that at flux densities below 300 μJy, SFGs+RQ AGNs surpass RL AGNs, and there are indications of a similar evolution between RQ AGNs and SFGs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Sharma, M. J. Page, A. A. Breeveld
Summary: We present measurements of the rest-frame ultraviolet (UV) galaxy luminosity function (LF) and luminosity density (LD) in the wavelength of far-UV (1500 angstrom) for a redshift range of z = 0.6- 1.2. Our results suggest an increase in star formation activity between redshifts z = 0.7 and z = 1. We also find that the faint-end slope at z = 0.7 is shallower compared to previous studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Christopher C. Lovell, Stephen M. Wilkins, Peter A. Thomas, Matthieu Schaller, Carlton M. Baugh, Giulio Fabbian, Yannick Bahe
Summary: This study introduces a new method using a machine learning framework to explore the relationship between galaxies and dark matter halos in the universe, enabling predictions of galaxy properties at a lower computational cost. By training the model in different environments, researchers can infer the bias of galaxy evolution, allowing application to larger volumes of dark-matter-only simulations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. Cairns, D. L. Clements, J. Greenslade, G. Petitpas, T. Cheng, Y. Ding, A. Parmar, I Perez-Fournon, D. Riechers
Summary: In this study, we conducted observations using SCUBA-2 and SMA to investigate four candidate high-redshift dusty star-forming galaxies. We detected multiple systems in three of the sources, indicating the presence of additional sources below the SMA detection limit. Photometric redshift estimates suggest that three of the sources are likely at z >= 2. Furthermore, the analysis of SCUBA-2 850 mu m maps revealed that one of the sources could potentially reside in a z >= 2 protocluster.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
B. Cedres, A. Bongiovanni, M. Cervino, J. Nadolny, J. Cepa, J. A. de Diego, A. M. Perez Garcia, J. Gallego, M. A. Lara-Lopez, M. Sanchez-Portal, J. Gonzalez-Serrano, E. J. Alfaro, R. Navarro Martinez, R. Perez Martinez, J. J. Gonzalez, C. P. Padilla Torres, H. O. Castaneda, M. Gonzalez
Summary: This paper aims to study the main properties and luminosity function of the [OII]3727 emitters detected in the OTELO survey at z~1.43, confirming 60 sources in low-mass galaxies. Most emitters have masses between 10^8 and 10^9 solar masses and are classified as late-type galaxies, with a faint-end slope of the LF determined to be alpha=-1.42 +/- 0.06 by sampling the LF to about 1 dex lower than in previous works.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
A. Montana, J. A. Zavala, I Aretxaga, D. H. Hughes, R. J. Ivison, A. Pope, D. Sanchez-Arguelles, G. W. Wilson, M. Yun, O. A. Cantua, M. McCrackan, M. J. Michalowski, E. Valiante, V Arumugam, C. M. Casey, R. Chavez, E. Colin-Beltran, H. Dannerbauer, J. S. Dunlop, L. Dunne, S. Eales, D. Ferrusca, V Gomez-Rivera, A. Gomez-Ruiz, V. H. de la Luz, S. J. Maddox, G. Narayanan, A. Omont, I Rodriguez-Montoya, S. Serjeant, F. P. Schloerb, M. Velazquez, S. Ventura-Gonzalez, P. van der Werf, M. Zeballos
Summary: The study presents observations of high-redshift dusty star-forming galaxy candidates using Large Millimeter Telescope (LMT)/AzTEC, revealing the presence of multiple systems within the targets, some of which show possible physical associations. Photometric redshifts, infrared luminosities, and star formation rates are derived from AzTEC and deblended Herschel photometry, providing insights into the spatial density of high-redshift ultrared sources and their contribution to obscured star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Sami Dib
Summary: We calculated the stellar integrated galactic initial mass function (IGIMF) in the presence of cluster-to-cluster variations of the IMR. The results showed that variations of the IMF parameters significantly affected the characteristic mass of the IGIMF, which in turn impacted star formation in galaxies. This provided a simple explanation for the bottom-heavy stellar mass function observed in early-type galaxies. IMF variations were found to be a dominant factor affecting the IGIMF, especially in regions of low metallicity, while variations in the slope of the initial cluster mass function (ICLMF) could dominate in regions of high metallicity.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
M. J. Page, T. Dwelly, I McHardy, N. Seymour, K. O. Mason, M. Sharma, J. A. Kennea, T. P. Sasseen, J. Rawlings, A. A. Breeveld, I Ferreras, N. S. Loaring, D. J. Walton, M. Symeonidis
Summary: The study utilized UV imaging data from the XMM-Newton Optical Monitor telescope to measure UV luminosity functions of galaxies with redshifts between 0.6 and 1.2, supplemented by optical and infrared imaging for photometric redshifts. The results indicated that the characteristic absolute magnitude M * is brighter for the redshift range 0.8 < z < 1.2 compared to 0.6 < z < 0.8.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
K. Tisanic, G. De Zotti, A. Amiri, A. Khoram, S. Tavasoli, Z. Vidovic-Tisanic
Summary: This study focused on the link between radio emission and star formation rates or infrared luminosity in a sample of local star-forming galaxies. The research aimed to improve the calibration of the radio luminosity-SFR relation and test for potential nonlinearities, ultimately finding no deviations from linearity. The results provide insights into the importance of the relationship between radio emission and star formation for radio astronomy.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
L. Fernandez, M. M. Cueli, J. Gonzalez-Nuevo, L. Bonavera, D. Crespo, J. M. Casas, A. Lapi
Summary: This study investigates the magnification bias on submillimeter galaxies (SMGs) caused by gravitational lensing effects. Results show that there is an inconsistency in the mass density profile at different scales, with a clear excess in the inner part compared to the outer part. Additionally, the average mass and concentration increase with the richness of the galaxy clusters.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Katrina C. Litke, Daniel P. Marrone, Manuel Aravena, Matthieu Bethermin, Scott C. Chapman, Chenxing Dong, Christopher C. Hayward, Ryley Hill, Sreevani Jarugula, Matthew A. Malkan, Desika Narayanan, Cassie A. Reuter, Justin S. Spilker, Nikolaus Sulzenauer, Joaquin D. Vieira, Axel Weiss
Summary: In this study, ALMA observations were used to investigate the multiphase interstellar medium in SPT 0346-52. It was found that this galaxy has a high star formation rate with molecular gas dominating the mass of the interstellar medium.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Justin S. Spilker, Christopher C. Hayward, Daniel P. Marrone, Manuel Aravena, Matthieu Bethermin, James Burgoyne, Scott C. Chapman, Thomas R. Greve, Gayathri Gururajan, Yashar D. Hezaveh, Ryley Hill, Katrina C. Litke, Christopher C. Lovell, Matthew A. Malkan, Eric J. Murphy, Desika Narayanan, Kedar A. Phadke, Cassie Reuter, Antony A. Stark, Nikolaus Sulzenauer, Joaquin D. Vieira, David Vizgan, Axel Weiss
Summary: The SPT 0311-58 system at z = 6.900 is an extremely massive structure within the reionization epoch. Our observations using the Atacama Large Millimeter/submillimeter Array provide detailed views of the dust continuum and [C II] 158 mu m emission in the central pair of galaxies. We speculate that gravitational interactions and fragmentation from massive parent disks have likely played a role in the overall dynamics and formation of clumps in the system.
ASTROPHYSICAL JOURNAL LETTERS
(2022)
Article
Astronomy & Astrophysics
Joshua Wilde, Stephen Serjeant, Jane M. Bromley, Hugh Dickinson, Leon V. E. Koopmans, R. Benton Metcalf
Summary: This study designs, builds, and trains several convolutional neural networks (CNNs) to identify strong gravitational lenses using simulated data. The CNNs achieve high recall scores for compound arcs and double rings, demonstrating their effectiveness in compound lens selection. Additionally, the interpretability of these CNNs is explored using various techniques.
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
Andreas L. Faisst, Lin Yan, Matthieu Bethermin, Paolo Cassata, Miroslava Dessauges-Zavadsky, Yoshinobu Fudamoto, Michele Ginolfi, Carlotta Gruppioni, Gareth Jones, Yana Khusanova, Olivier LeFevre, Francesca Pozzi, Michael Romano, John Silverman, Brittany Vanderhoof
Summary: A multiwavelength study of galaxies is crucial for understanding their formation and evolution. Using ALMA, researchers were able to study the far-infrared properties of galaxies at high redshifts. The ALPINE survey provides the largest multiwavelength sample of post-reionization galaxies, advancing our understanding in various areas.
Article
Astronomy & Astrophysics
Chris Sedgwick, Stephen Serjeant
Summary: This study explores a method for finding giant planets in the outer Solar system by detecting their thermal emission and proper motion. A series of filtering and SED-fitting algorithms is used to find potential candidates, but further observations indicate that they are most likely sourced from cirrus clouds.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Hugh Dickinson, Dominic Adams, Vihang Mehta, Claudia Scarlata, Lucy Fortson, Stephen Serjeant, Coleman Krawczyk, Sandor Kruk, Chris Lintott, Kameswara Bharadwaj Mantha, Brooke D. Simmons, Mike Walmsley
Summary: This article introduces a citizen science project called Galaxy Zoo: Clump Scout, which uses a statistically driven software framework to identify giant star forming clumps in galaxies. By aggregating annotations from multiple volunteers, they generate consensus labels and evaluate the reliability of the results. Using a large dataset, they successfully identify and study thousands of potential clumps.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. M. Casas, L. Bonavera, J. Gonzalez-Nuevo, M. M. Cueli, D. Crespo, E. Goitia, C. Gonzalez-Gutierrez, J. D. Santos, M. L. Sanchez, F. J. de Cos
Summary: This study develops and trains a machine learning model based on a convolutional neural network to estimate the polarisation flux density and angle of point sources embedded in cosmic microwave background images. The model shows reliable results in constraining the polarisation flux density of sources above 80 mJy, with relative errors below 30% for most flux density levels. It can also determine the polarisation angle of Q and U sources with a 1 sigma uncertainty of +/- 29 degrees and +/- 32 degrees, respectively.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
C. L. Hale, I. H. Whittam, M. J. Jarvis, P. N. Best, N. L. Thomas, I Heywood, M. Prescott, N. Adams, J. Afonso, Fangxia An, R. A. A. Bowler, J. D. Collier, R. H. W. Cook, R. Dave, B. S. Frank, M. Glowacki, P. W. Hatfield, S. Kolwa, C. C. Lovell, N. Maddox, L. Marchetti, L. K. Morabito, E. Murphy, I Prandoni, Z. Randriamanakoto, A. R. Taylor
Summary: We analyze the 1.4 GHz source counts from the Early Science data release of MeerKAT and correct for the incompleteness to determine the true underlying population. Multiple simulations were used to account for detection errors, clustering, and variations in the assumed source model. Our results show that AGN dominate the sky temperature contribution from radio sources, but below 1 mJy, SFGs become increasingly important, reaching a contribution of approximately 15-25% to the total sky background temperature (T-b approximately 100 mK).
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Hagimoto, T. J. L. C. Bakx, S. Serjeant, G. J. Bendo, S. A. Urquhart, S. Eales, K. C. Harrington, Y. Tamura, H. Umehata, S. Berta, A. R. Cooray, P. Cox, G. De Zotti, M. D. Lehnert, D. A. Riechers, D. Scott, P. Temi, P. P. van der Werf, C. Yang, A. Amvrosiadis, P. M. Andreani, A. J. Baker, A. Beelen, E. Borsato, V Buat, K. M. Butler, H. Dannerbauer, L. Dunne, S. Dye, A. F. M. Enia, L. Fan, R. Gavazzi, J. Gonzalez-Nuevo, A. Harris, C. N. Herrera, D. H. Hughes, D. Ismail, R. J. Ivison, B. Jones, K. Kohno, M. Krips, G. Lagache, L. Marchetti, M. Massardi, H. Messias, M. Negrello, R. Neri, A. Omont, I Perez-Fournon, C. Sedgwick, M. W. L. Smith, F. Stanley, A. Verma, C. Vlahakis, B. Ward, C. Weiner, A. Weiss, A. J. Young
Summary: We analyze emission lines in 71 bright Herschel-selected galaxies detected by the ALMA, finding similar interstellar medium conditions and gas-to-dust ratios to local infrared-luminous galaxies and high-redshift dusty star-forming galaxies. However, these galaxies have denser gas and more intense far-ultraviolet radiation fields. The gas-to-dust ratios appear to be consistent with Milky Way values without any significant redshift evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
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)
