Article
Astronomy & Astrophysics
R. E. Miura, D. Espada, A. Hirota, C. Henkel, S. Verley, M. I. N. Kobayashi, S. Matsushita, F. P. Israel, B. Vila-Vilaro, K. Morokuma-Matsui, J. Ott, C. Vlahakis, A. B. Peck, S. Aalto, M. R. Hogerheijde, N. Neumayer, D. Iono, K. Kohno, H. Takemura, S. Komugi
Summary: A census of giant molecular clouds (GMCs) in the inner region of the Centaurus A galaxy reveals similarities with GMC properties in spiral galaxies but distinct features in the circumnuclear disc, possibly influenced by the active galactic nucleus and/or shear motions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Jindra Gensior, J. M. Diederik Kruijssen
Summary: In certain conditions, galactic dynamics can suppress star formation and play a significant role in galaxy evolution. The study suggests that dynamical suppression is more effective at low gas fractions and may have an impact in the low redshift and high galaxy mass range.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
E. Perez-Hernandez, S. N. Kemp, V. H. Ramirez-Siordia, A. Nigoche-Netro
Summary: This study presents a comprehensive investigation of deep optical long-slit spectroscopy and deep broad-band photometry of NGC 6086. The results reveal the presence of two separate structures in NGC 6086 and the existence of an envelope. Additionally, the study finds radial discontinuity in the distribution of galaxies in the cluster A2162, indicating the need for further investigation of the cluster's kinematics.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Sabine Bellstedt, Aaron S. G. Robotham, Simon P. Driver, Jessica E. Thorne, Luke J. M. Davies, Benne W. Holwerda, Andrew M. Hopkins, Maritza A. Lara-Lopez, Angel R. Lopez-Sanchez, Steven Phillipps
Summary: By analyzing the metallicity histories of galaxies from the GAMA survey using the SED-fitting code PROSPECT, we were able to track the gas-phase mass-metallicity relation and the evolving mass-metallicity relation with time. Our results show that the evolving metallicity implementation used in PROSPECT produces reasonable metallicity results over the history of a galaxy, providing a significant improvement to the accuracy of the SED-fitting outputs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Jindra Gensior, Timothy A. Davis, Martin Bureau, J. M. Diederik Kruijssen, Michele Cappellari, Ilaria Ruffa, Thomas G. Williams
Summary: Observations show that the central gas discs in early-type galaxies are smoother than those in late-type galaxies. Simulations suggest that the suppression of fragmentation in spheroid-dominated galaxies is due to the shear-induced turbulence. Power spectrum slope analysis indicates that high shear can lead to incompressible turbulence.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Rodrigo Flores-Freitas, Ana L. Chies-Santos, Cristina Furlanetto, Maria Emilia De Rossi, Leonardo Ferreira, Lucas J. Zenocratti, Karla A. Alamo-Martinez
Summary: In this study, relic galaxy analogues were searched for in the TNG50 cosmological simulations, and five potential relic analogues were found. One of the analogues satisfied most observational constraints and showed similarities to the confirmed relic NGC 1277. However, the brightness and density profiles of the analogues were less steep than those of real relic galaxies. Two formation pathways of relic analogues in TNG50 were identified depending on their environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ilaria Ruffa, Timothy A. Davis, Michele Cappellari, Martin Bureau, Jacob Elford, Satoru Iguchi, Federico Lelli, Fu-Heng Liang, Lijie Liu, Anan Lu, Marc Sarzi, Thomas G. Williams
Summary: We present a CO dynamical estimate of the mass of the supermassive black hole (SMBH) in three nearby early-type galaxies. The study shows the presence of massive dark objects at the center of NGC 1574 and NGC 4261, while only an upper limit can be obtained for NGC 0612. The results are consistent with predictions from the M-BH - sigma(*) relation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Timothy A. Davis, Jindra Gensior, Martin Bureau, Michele Cappellari, Woorak Choi, Jacob S. Elford, J. M. Diederik Kruijssen, Federico Lelli, Fu-Heng Liang, Lijie Liu, Ilaria Ruffa, Toshiki Saito, Marc Sarzi, Andreas Schruba, Thomas G. Williams
Summary: This study investigates the morphology of the molecular interstellar medium (ISM) in nearby galaxies using high-resolution maps. It finds that early-type galaxies have smooth and regular molecular gas morphologies, while spiral galaxy bulges exhibit more asymmetric and clumpy morphologies at the same spatial scales. Various large-scale galaxy parameters, such as galaxy morphological type and stellar mass, are found to significantly influence the morphology of the ISM. Contrary to previous beliefs, the study suggests that gas self-gravity is not the dominant process shaping the morphology of the molecular gas in galaxy centers.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Angelos Nersesian, Stefano Zibetti, Francesco D'Eugenio, Maarten Baes
Summary: In this study, a non-parametric morphology analysis of local galaxies is presented to explore the dependence of various morphological parameters on wavelength and morphological type. The results show strong gradients in the physical size, M-20 index, and concentration of galaxies from blue to red optical wavelengths. The distribution of nebular emission is found to be less concentrated than the stellar continuum, and a strong correlation is observed between the concentration and the specific star formation rate and morphological type. The impact of galaxy inclination on the results is also investigated.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Bogdan A. Pastrav
Summary: Through detailed structural analysis of different types of galaxies, it was found that dust and inclination effects can produce significant changes in bulge parameters, with different characteristics observed in bulges of spiral galaxies and late-type galaxies. Additionally, there are distinct patterns in the relationships between the Sersic index, black hole mass, and bulge luminosity for different types of galaxies, but morphological separation of bulges remains challenging.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Siudek, K. Lisiecki, J. Krywult, D. Donevski, C. P. Haines, A. Karska, K. Malek, T. Moutard, A. Pollo
Summary: Red ultra-compact massive galaxies called red nuggets were formed at high redshifts (z similar to 2-3). For the first time, we examined the environmental properties of red nuggets at intermediate redshifts (0.5 < z < 0.9) and found consistent fractions across all local densities. Quiescent red nuggets are overabundant in low-density environments, suggesting different survival mechanisms for red nuggets in different environments.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Mitchell K. Cavanagh, Kenji Bekki, Brent A. Groves
Summary: Using deep learning to classify high-redshift COSMOS images, we find an increase in the fraction of S0 galaxies and a corresponding decrease in the fraction of spirals with decreasing redshift. We also discover a bimodality in the mass distribution of S0s, with high-mass S0s being mainly red and quiescent, while low-mass S0s are generally bluer and include both passive and star-forming S0s. Additionally, we observe that the S0 fraction in high-mass galaxies starts to rise at higher redshifts compared to low-mass galaxies, indicating earlier evolution of high-mass S0s.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Lijie Liu, Martin Bureau, Leo Blitz, Timothy A. Davis, Kyoko Onishi, Mark Smith, Eve North, Satoru Iguchi
Summary: High spatial resolution observations of the nearby lenticular galaxy NGC 4429 reveal differences in giant molecular clouds compared to those in the Milky Way disc, with clouds appearing to be in a critical state where external gravity is as important as self-gravity in regulating the clouds.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Melinda Townsend, Gregory Rudnick
Summary: Luminous red galaxies (LRGs) are massive galaxies with old stellar populations and little star formation. They primarily grow through the accretion of satellites. However, there has been a lack of deep imaging data to study this. In this study, the authors use the DESI Legacy Imaging Surveys to investigate the satellite galaxy population of LRGs up to z = 0.65 and determine the amount of stellar mass growth in LRGs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Yu-Zhong Wu, Wei Zhang
Summary: This study analyzes 4615 star-forming early-type galaxies (ETGs) using data from the Galaxy Zoo and Max Planck Institute for Astrophysics-Johns Hopkins University (MPA-JHU) emission-line measurements. It reveals a significant trend of lower/higher stellar mass ETGs having lower/higher star formation rates (SFRs), and establishes a best-fit model for the SFR and stellar mass relationship. The study also highlights the correlation of stellar mass-metallicity (MZ) relation in star-forming ETGs, as well as potential sources for higher metallicity measurements.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Damien Beaulieu, Andreea Petric, Carmelle Robert, Katherine Alatalo, Timothy Heckman, Maya Merhi, Laurie Rousseau-Nepton, Kate Rowlands
Summary: In this study, the star formation rates of Mrk 266 were determined based on measurements of cold and ionized gas. The results show that Mrk 266 is an intermediate stage merger with a relatively high recent star formation rate and enough molecular gas to sustain it for a few hundred million years. The difference between the two galaxy components may originate from the properties of the interstellar medium.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Gregory M. Green, Yuan-Sen Ting, Harshil Kamdar
Summary: The goal of this study is to recover the gravitational potential field of the Milky Way using a novel method based on deep learning. By training a normalizing flow on observed phase-space coordinates of stars and using the collisionless Boltzmann equation, they were able to determine the gravitational potential represented by a feed-forward neural network. This new method, called Deep Potential, is more flexible and robust than previous parametric methods.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Scott A. Tompkins, Simon P. Driver, Aaron S. G. Robotham, Rogier A. Windhorst, Claudia del P. Lagos, T. Vernstrom, Andrew M. Hopkins
Summary: We present a revised measurement of the extragalactic background light (EBL) at radio frequencies based on a near complete compendium of radio source counts. We report the radio-EBL at multiple frequencies, each showing a two-humped distribution that matches well with active galactic nucleus (AGN) and star-forming galaxy (SFG) populations, with both populations contributing roughly equal energy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Matthew J. Wilkinson, Aaron D. Ludlow, Claudia del P. Lagos, S. Michael Fall, Joop Schaye, Danail Obreschkow
Summary: Using idealized N-body simulations, we have investigated the impact of spurious heating of star particles by dark matter on the kinematics and morphology of galactic discs. We find that collisional heating leads to an increase in the velocity dispersion and a decrease in the mean velocities of stellar particles. The rate of heating is primarily determined by the number of dark matter particles and the radial gradients in the local density, regardless of the stellar particle mass. Galaxies with fewer than approximately 10^6 dark matter particles are particularly susceptible to spurious morphological evolution, leading to a transformation from flattened structures to rounder spheroidal systems with reduced rotational support.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Aleksandra Hamanowicz, Martin A. Zwaan, Celine Peroux, Claudia del P. Lagos, Anne Klitsch, Rob J. Ivison, Andrew D. Biggs, Roland Szakacs, Alejandra Fresco
Summary: We conducted a pilot, untargeted extragalactic carbon monoxide (CO) emission-line survey using ALMACAL, a project that uses ALMA calibration data for scientific purposes. With this pilot survey, we probed a cosmologically significant volume and derived the redshift probability of the CO detections. The results of our survey are consistent with other untargeted emission-line surveys and theoretical models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Katriona M. L. Gould, Gabriel Brammer, Francesco Valentino, Katherine E. Whitaker, John. R. Weaver, Claudia del P. Lagos, Francesca Rizzo, Maximilien Franco, Bau-Ching Hsieh, Olivier Ilbert, Shuowen Jin, Georgios Magdis, Henry J. McCracken, Bahram Mobasher, Marko Shuntov, Charles L. Steinhardt, Victoria Strait, Sune Toft
Summary: This study selects and characterizes a sample of massive quiescent galaxies at 3 < z < 5 using a new rest-frame color-selection method. The method outperforms classical rest-frame UVJ selection and shows potential as an alternative. Comparisons with UVJ- and NUVrJ-selected samples indicate that rest-frame color cannot be equivalently used at z > 3. The study confirms the early onset of massive galaxy quenching at 3 < z < 5.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
J. R. Weaver, I. Davidzon, S. Toft, O. Ilbert, H. J. Mccracken, K. M. L. Gould, C. K. Jespersen, C. Steinhardt, C. D. P. Lagos, P. L. Capak, C. M. Casey, N. Chartab, A. L. Faisst, C. C. Hayward, J. S. Kartaltepe, O. B. Kauffmann, A. M. Koekemoer, V. Kokorev, C. Laigle, D. Liu, A. Long, G. E. Magdis, C. J. R. Mcpartland, B. Milvang-Jensen, B. Mobasher, A. Moneti, Y. Peng, D. B. Sanders, M. Shuntov, A. Sneppen, F. Valentino, L. Zalesky, G. Zamorani
Summary: This study presents constraints on the shape and evolution of the galaxy stellar mass function (SMF) and the cosmic stellar mass density. The authors utilize data from the COSMOS survey to infer the intrinsic galaxy stellar mass function, its key parameters evolution, and the cosmic stellar mass density. The results indicate a smooth and monotonic evolution in the galaxy SMF since z = 7.5, in agreement with previous studies. Furthermore, a sustained agreement is found between the stellar and dark matter halo mass functions. Star formation in massive halos may be more efficient at early times.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Marta Frias Castillo, Jacqueline Hodge, Matus Rybak, Paul van der Werf, Ian Smail, Jack E. Birkin, Chian-Chou Chen, Scott C. Chapman, Ryley Hill, Claudia del P. Lagos, Cheng-Lin Liao, Elisabete da Cunha, Gabriela Calistro Rivera, Jianhang Chen, E. F. Jimenez-Andrade, Eric J. Murphy, Douglas Scott, A. M. Swinbank, Fabian Walter, R. J. Ivison, Helmut Dannerbauer
Summary: We present the initial results of a survey targeting the CO(J = 1-0) transition in submillimeter-selected star-forming galaxies at high redshift. Out of the 30 galaxies observed, we detect CO(1-0) emission in 11 targets, with three tentative detections. The total molecular gas masses, gas mass fractions, and depletion times of our sources are in good agreement with predictions from the SHARK semi-analytical model.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Christopher J. R. Clark, Julia C. C. Roman-Duval, Karl D. D. Gordon, Caroline Bot, Matthew W. L. Smith, Lea M. Z. Hagen
Summary: We investigate the relationship between the dust-to-gas ratio and density in four well-resolved Local Group galaxies—the LMC, SMC, M31, and M33—using new Herschel maps. Our findings show a significant increase in the dust-to-gas ratio with density, varying by up to a factor of 22.4 within each galaxy. We propose that this increase is driven by dust grain growth in denser regions of the interstellar medium (ISM).
ASTROPHYSICAL JOURNAL
(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
Xiaosheng Zhao, Yuan-Sen Ting, Kangning Diao, Yi Mao
Summary: This study quantitatively compares the performance of the diffusion model and StyleGAN2 in generating astronomical images. The results show that the diffusion model outperforms StyleGAN2 on different sizes of training sets and has a more robust generation capability.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
David Yong, Fan Liu, Yuan-Sen Ting, Meridith Joyce, Bertram Bitsch, Fei Dai, Aaron Dotter, Amanda I. Karakas, Michael T. Murphy
Summary: This study conducts a line-by-line differential analysis of 125 co-moving pairs of stars and obtains high-precision stellar parameters. These stars are classified into chemically homogeneous and inhomogeneous groups. The study reveals the relationship between separation, effective temperature, and chemically homogeneous pairs. The importance of this study lies in the discovery of a sample of bright co-moving pairs with chemical abundance differences comparable to that of the Hyades open cluster, which can be used for calibrating stellar abundances in large-scale spectroscopic surveys.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(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)