Article
Astronomy & Astrophysics
Fangzhou Jiang, Andrew Benson, Philip F. Hopkins, Oren Slone, Mariangela Lisanti, Manoj Kaplinghat, Annika H. G. Peter, Zhichao Carton Zeng, Xiaolong Du, Shengqi Yang, Xuejian Shen
Summary: We have developed a semi-analytic procedure that combines the isothermal Jeans model and the model of adiabatic halo contraction to compute the density profile of self-interacting dark matter (SIDM) haloes influenced by the presence of galaxies. This model agrees well with cosmological SIDM simulations and provides insights into the diverse halo response to baryonic effects in SIDM.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
M. Icaza-Lizaola, Richard G. Bower, Peder Norberg, Shaun Cole, Matthieu Schaller
Summary: We use sparse regression methods (SRMs) to accurately predict the stellar mass of galaxies based on properties of their dark matter halos. Our methodology simplifies the modeling process and achieves comparable accuracy as other machine learning algorithms. By removing the distinction between central and satellite galaxies, we can model their evolution based solely on halo growth history. The SRM model can reproduce important galaxy properties and could be used for large-scale structure surveys.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Vicente Delgado, Antonio Munoz Mateo
Summary: This study assumes dark matter to be a cosmological self-gravitating Bose-Einstein condensate comprised of non-relativistic ultralight scalar particles with competing gravitational and repulsive contact interactions. It explores the observational implications of this model and finds that dark matter structures can form stable self-bound structures exhibiting a universal mass profile and rotation curve.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
G. Bonnet, E. Nezri, K. Kraljic, C. Schimd
Summary: The morphology of haloes provides valuable information for understanding cosmological and galaxy formation models. Minkowski Functionals (MFs) are used to characterize the actual morphology of haloes, which go beyond traditional spherical or ellipsoidal symmetries and can capture the internal structures and external shape parameters of haloes more accurately.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Stephanie O'Neil, Mark Vogelsberger, Saniya Heeba, Katelin Schutz, Jonah C. Rose, Paul Torrey, Josh Borrow, Ryan Low, Rakshak Adhikari, Mikhail Medvedev, Tracy R. Slatyer, Jesus Zavala
Summary: Self-interacting dark matter (SIDM) can alleviate discrepancies between simulated cold dark matter (CDM) and observed galactic properties. We propose a physically motivated SIDM model with a nearly degenerate excited state that allows for both elastic and inelastic scattering. Our simulations show that up-scattering reactions increase the central densities of the main halo, but coring still occurs due to elastic and down-scattering effects.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Tonatiuh Matos
Summary: The scalar field dark matter (SFDM) model has received attention for its ability to provide simpler and more natural explanations. Recent research shows that SFDM can explain the polar orbits of satellite galaxies and the emissions in the vacuum regions of our galaxy. The quantum character of SFDM plays a crucial role in these phenomena, even at the cosmological level.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Hei Yin Jowett Chan, Elisa G. M. Ferreira, Simon May, Kohei Hayashi, Masashi Chiba
Summary: In the fuzzy dark matter model, there is a significant dispersion in the core-halo mass relation, increasing with halo mass. A new empirical equation for the core-halo mass relation is provided, with uncertainties encompassing previously found relations. Any observational constraints on particle mass using a tight one-to-one core-halo mass relation should consider an additional uncertainty of about 50%.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Camila A. Correa, Matthieu Schaller, Sylvia Ploeckinger, Noemi Anau Montel, Christoph Weniger, Shin'ichiro Ando
Summary: We introduce the TangoSIDM project, a suite of cosmological simulations that explore the impact of large dark matter scattering cross-sections over dwarf galaxy scales. The simulations accurately model core formation and gravothermal core collapse, showing that the velocity-dependent cross-sections produce a large diversity in the circular velocities of satellite haloes. This research offers a promising explanation for the diversity in density and velocity profiles observed in dwarf galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Hsinhao Huang, Hsi-Yu Schive, Tzihong Chiueh
Summary: In this study, the wave (fuzzy) dark matter (psi DM) is extended to two components and their soliton-halo structure is investigated through cosmological simulations. The results show that when the proportion of the two components is 75% and 25%, both the major and minor component solitons coexist and have similar masses. However, when the proportion is 25% and 75%, a minor-component soliton cannot form. This work demonstrates the advantages of the multi-component psi DM model over the single-component model.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
P. Cataldi, S. E. Pedrosa, P. B. Tissera, M. C. Artale, N. D. Padilla, R. Dominguez-Tenreiro, L. Bignone, R. Gonzalez, L. J. Pellizza
Summary: In this study, we investigate the evolution of the morphology of Milky Way mass-like dark matter haloes selected from the cielo and IllustrisTNG projects. We focus on the halo shapes and their relation with the infalling material across cosmic time using hydrodynamical simulations. Our findings show that haloes tend to be more triaxial at earlier times due to stronger accretion in the direction of the filaments, but become more spherical as they evolve towards a dominant isotropic accretion mode and relaxation. Baryons have a significant effect on the shapes of the haloes, driving them from triaxial to rounder shapes within the inner regions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
I-Kang Liu, Nick P. Proukakis, Gerasimos Rigopoulos
Summary: We find that fuzzy dark matter haloes exhibit spatial differentiation in coherence, with complete coherence in the central solitonic core and incoherence outside of it. The phase-space density decreases significantly as the radius increases. The core is a pure condensate, overlapping perfectly with the largest eigenvalue of the one-particle density matrix. The outer halo consists of local, short-lived quasi-condensate lumps called granules, separated by vortices that form a dynamic web, inhibiting phase coherence throughout the entire halo.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Yi-Ming Zhong, Daneng Yang, Hai-Bo Yu
Summary: The presence of a central baryonic potential significantly affects the gravothermal evolution of self-interacting dark matter (SIDM) haloes. By incorporating a static baryonic potential in a fluid model and calibrating it with N-body simulations, the study reveals changes in SIDM halo properties and an accelerated evolution of the halo. A quasi-universality in the gravothermal evolution of SIDM haloes with the baryonic potential is observed, offering a framework for testing SIDM predictions using observations of galactic systems.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Jianxiong Chen, M. -C. Chu
Summary: The study demonstrates that dark matter decay leads to the flattening of central density and an overall reduction in density in dwarf halos. Both zoom-in simulations and a simplified model agree well with N-body simulations, suggesting the potential of DDM in resolving small-scale problems faced by the cold dark matter model.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Preetish K. Mishra, Divya Rana, Surhud More
Summary: This study investigates the relationship between stellar mass and the size of galaxies in relation to the radius of dark matter halos using weak gravitational lensing measurements. The findings suggest that the ratio of galaxy size to halo radius remains constant over a certain range of stellar mass, but shows a decreasing trend in low-mass galaxies. This calls for either modifications to models explaining the sizes of dwarf galaxies or a better understanding of dark matter halos in low-mass galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Xuejian Shen, Philip F. Hopkins, Lina Necib, Fangzhou Jiang, Michael Boylan-Kolchin, Andrew Wetzel
Summary: The study investigates the effects of dissipative self-interacting dark matter in cosmological simulations, exploring the parameter space. Low-mass dwarf galaxies exhibit cuspy dark matter density profiles with a power-law slope of approximately -1.5. Models with higher cross-sections show dark matter rotation and halo deformation, but do not result in baryon-like thin 'dark discs'.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ana Contreras-Santos, Alexander Knebe, Frazer Pearce, Roan Haggar, Meghan Gray, Weiguang Cui, Gustavo Yepes, Marco De Petris, Federico De Luca, Chris Power, Robert Mostoghiu, Sebastian E. Nuza, Matthias Hoeft
Summary: Using a large-scale simulation dataset, this study investigates the effect of mergers on the color and luminosity changes of the brightest cluster galaxies (BCGs) in galaxy clusters. The results show that mergers lead to an increase in mass, age, and metallicity of BCGs, and induce a burst in star formation. BCGs in mergers form significantly more stars compared to those in non-merging clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Alexander Knebe, Daniel Lopez-Cano, Santiago Avila, Ginevra Favole, Adam R. H. Stevens, Violeta Gonzalez-Perez, Guillermo Reyes-Peraza, Gustavo Yepes, Chia-Hsun Chuang, Francisco-Shu Kitaura
Summary: New surveys, such as ESA's Euclid mission, aim to map the large-scale structure of the Universe with unprecedented precision. This study develops theoretically modelled galaxy catalogues to estimate the performance of these surveys. By adjusting flux thresholds and applying dust-attenuation models, additional emission-line galaxy catalogues are created. The research shows a scale-independent bias in galaxy clustering, which increases linearly with redshift.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ulrike Kuchner, Roan Haggar, Alfonso Aragon-Salamanca, Frazer R. Pearce, Meghan E. Gray, Agustin Rost, Weiguang Cui, Alexander Knebe, Gustavo Yepes
Summary: Galaxy clusters grow by accreting galaxies from the field and along cosmic filaments, with up to 45% of galaxies falling into clusters via filaments. Backsplash galaxies, comprising between 30-60% of filament galaxies at R-200, return to clusters after deflecting widely from their entry trajectory, especially in relaxed clusters. The study reveals that galaxies in clusters are influenced by their environment, with pristine galaxies being environmentally affected by cosmic filaments alone.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Oliver Newton, Noam Libeskind, Alexander Knebe, Miguel A. Sanchez-Conde, Jenny G. Sorce, Sergey Pilipenko, Matthias Steinmetz, Ruediger Pakmor, Elmo Tempel, Yehuda Hoffman, Mark Vogelsberger
Summary: The Local Group provides a unique environment for studying galaxy formation. Interactions between low-mass haloes and more massive ones, such as the Milky Way and M31, enhance concentration and strip away gas and other materials. Special types of haloes, called Hermeian haloes, have higher concentrations and are distributed anisotropically along the line connecting the Milky Way and M31. These haloes facilitate the exchange of dark matter, gas, and stars between the two primary hosts, and can potentially host galaxies that produce signals competitive with some dwarf galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Adam B. Watts, Luca Cortese, Barbara Catinella, Chris Power, Amelia Fraser-McKelvie, Julia J. Bryant, Scott M. Croom, Jesse van de Sande, Joss Bland-Hawthorn, Brent Groves
Summary: By using optical integral field spectrograph (IFS) observations, the connection between asymmetry in ionized and neutral gas reservoirs in galaxies is studied to investigate the origin of global H I asymmetry. The majority of asymmetric cases are driven by the distribution of H alpha-emitting gas, and there is no evidence of a relationship between global H alpha and H I asymmetry. The comparison between global H alpha and H I asymmetry is not straightforward, and many global H I asymmetries do not significantly impact the central regions of galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Sreedhar Balu, Bradley Greig, Yisheng Qiu, Chris Power, Yuxiang Qin, Simon Mutch, J. Stuart B. Wyithe
Summary: In this study, the authors use the MERAXES semi-analytic galaxy formation and reionization model to predict the 21-cm global signal and power spectra during the Epoch of Reionization. They incorporate X-ray heating and thermal evolution of the intergalactic medium into the model. By augmenting their simulation using the DARKFOREST Monte Carlo merger tree algorithm, they are able to explore the impact of mass resolution on the predicted reionization history and the impact of X-ray heating on the 21-cm global signal and power spectra.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Tomas Hough, Sofia A. Cora, Roan Haggar, Cristian Vega-Martinez, Ulrike Kuchner, Frazer Pearce, Meghan Gray, Alexander Knebe, Gustavo Yepes
Summary: In this study, the semi-analytic model of galaxy formation and evolution SAG is combined with 102 simulated galaxy clusters from THE THREE HUNDRED project to investigate the relationship between star formation quenching and the dynamical history of galaxies in and around clusters. Galaxies are classified into four populations based on their orbital history, and it is found that the majority of quenched galaxies inside clusters are ancient infallers with low or no hot and cold gas content. The quenching of ancient infallers is mainly caused by ram-pressure stripping (RPS) between the first and second pericentric passages. Recent infallers make up a smaller fraction of quenched galaxies inside clusters, and they tend to have a higher proportion of hot and cold gas. Pre-processing effects contribute to the quenching of recent infallers before they enter the main cluster progenitor. Backsplash galaxies, which account for about 65% of quenched galaxies around clusters, require both pre-processing and in-cluster processes to suppress star formation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Oliver Newton, Arianna Di Cintio, Salvador Cardona-Barrero, Noam I. Libeskind, Yehuda Hoffman, Alexander Knebe, Jenny G. Sorce, Matthias Steinmetz, Elmo Tempel
Summary: Ultradiffuse galaxies (UDGs) are difficult to detect due to their low surface brightness, but they are important for studying cosmological models and galaxy formation. Previous studies have found a small number of UDGs in the Local Group, but it is unclear if this is expected. Using hydrodynamic simulations, we predict that there are around 12 isolated UDGs in the Local Group, of which 2 are detectable in the Sloan Digital Sky Survey. Future all-sky surveys could potentially reveal a larger population of UDGs in the Local Group.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Ana Contreras-Santos, Alexander Knebe, Weiguang Cui, Roan Haggar, Frazer Pearce, Meghan Gray, Marco De Petris, Gustavo Yepes
Summary: Using the data from THE THREE HUNDRED project, this study investigates galaxy pairs in high-density environments and explores the effectiveness of observational techniques and machine learning in identifying true pairs. The results show that the specific thresholds used to find pairs significantly affect the purity and completeness of the sample. By training a machine learning model, the study improves the accuracy and completeness of identifying true pairs and identifies important properties for distinguishing them.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Qingyang Li, Weiguang Cui, Xiaohu Yang, Romeel Dave, Elena Rasia, Stefano Borgani, Meneghetti Massimo, Alexander Knebe, Klaus Dolag, Jack Sayers
Summary: This paper presents theoretical studies on the scaled profiles of physical properties associated with the baryonic components in galaxy clusters, from z = 4 to z = 0. By comparing two simulations and observed profiles, it is found that the agreements between the simulations and observations are mostly at outer radii, with better agreement in gas profiles for Gadget-X compared to Gizmo-SIMBA in the central regions. The evolution trends are generally consistent between the two simulations, with less discrepancy in the gas density profile compared to temperature and entropy profiles at high redshift.
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(2023)
Article
Astronomy & Astrophysics
Daniel J. Cornwell, Alfonso Aragon-Salamanca, Ulrike Kuchner, Meghan E. Gray, Frazer R. Pearce, Alexander Knebe
Summary: This paper tests and quantifies the ability of upcoming wide-field spectroscopic surveys to identify the environment of individual galaxies in the vicinity of massive galaxy clusters. The study finds that associating galaxies with the correct cosmic web environment is highly uncertain in the infall regions surrounding galaxy clusters due to peculiar velocities and projection effects. However, with large enough spectroscopic samples and correct statistical treatment, robust conclusions on the relationship between galaxy properties and their environment can be extracted.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Patrick M. Yates-Jones, Stanislav S. Shabala, Chris Power, Martin G. H. Krause, Martin J. Hardcastle, Elena A. N. Mohd Noh Velastin, Georgia S. C. Stewart
Summary: We introduce the CosmoDRAGoN project, which consists of a suite of simulated AGN jets in cosmological environments. By sampling the intra-cluster media of galaxy clusters from cosmological SPH simulations, we simulate radio jets using grid-based hydrodynamic simulations. We inject initially conical jets with different powers, speeds, and opening angles, and study their collimation and propagation on large scales, calculating synthetic radio spectra. Our simulations demonstrate the importance of accurately representing both the jets and their environments for understanding radio morphology, spectra, and the feedback provided by the jets.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2023)
Article
Astronomy & Astrophysics
K. E. Harborne, A. Serene, E. J. A. Davies, C. Derkenne, S. Vaughan, A. I. Burdon, C. del P. Lagos, R. Mcdermid, S. O'Toole, C. Power, A. S. G. Robotham, G. Santucci, R. Tobar
Summary: This work presents a methodology and code-base for constructing mock IFS observations of simulated galaxies, aiming to improve collaboration and comparison between observation and theory, and accelerate our understanding of galaxy kinematics evolution. The open-source package SimSpin, written in R, can be interacted with in any coding language via an API interface and is being utilized by international IFS collaborations.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2023)
Article
Astronomy & Astrophysics
Adam B. Watts, Luca Cortese, Barbara Catinella, Chris Power, Amelia Fraser-McKelvie, Julia J. Bryant, Scott M. Croom, Jesse van de Sande, Joss Bland-Hawthorn, Brent Groves
Summary: Through analysis of observational data from the Sydney AAO Multi-object IFS survey, we find that there is no evident correlation between global H alpha and HI asymmetry. The majority of asymmetry is driven by the distribution of H alpha-emitting gas, and many cases of asymmetry do not significantly impact the central regions of galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
James R. Allison, E. M. Sadler, A. D. Amaral, T. An, S. J. Curran, J. Darling, A. C. Edge, S. L. Ellison, K. L. Emig, B. M. Gaensler, L. Garratt-Smithson, M. Glowacki, K. Grasha, B. S. Koribalski, C. del P. Lagos, P. Lah, E. K. Mahony, S. A. Mao, R. Morganti, V. A. Moss, M. Pettini, K. A. Pimbblet, C. Power, P. Salas, L. Staveley-Smith, M. T. Whiting, O. Wong, H. Yoon, Z. Zheng, M. A. Zwaan
Summary: The First Large Absorption Survey in HI (FLASH) is a wide field survey using the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope to search for 21-cm line absorption in neutral atomic hydrogen (HI) at intermediate cosmological redshifts. The survey aims to explore the poorly understood HI content of the Universe at redshifts between z = 0.4 and 1.0 and is expected to detect several hundred 21-cm absorbers. FLASH will also provide important kinematical information for models of gas accretion and jet-driven feedback in radio-loud active galactic nuclei.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2022)