Review
Astronomy & Astrophysics
Giuseppina Battaglia, Carlo Nipoti
Summary: This article reviews the properties of dwarf galaxies in the Local Group, focusing on their stellar dynamics and dark matter content and distribution. The combination of observed data and dynamical models reveals that these galaxies are mostly dominated by dark matter halos, making them valuable for studying the nature of dark matter.
Article
Astronomy & Astrophysics
Elham Rahimi, Evan Vienneau, Nassim Bozorgnia, Andrew Robertson
Summary: We investigate the impact of dark matter self-interactions on the local distribution of dark matter in selected Milky Way-like galaxies. Two different self-interacting dark matter models, with constant and velocity-dependent self-interaction cross-sections, are employed in hydrodynamical simulations. The results show that adding self-interactions and baryons in the simulations leads to local velocity distributions of dark matter halos resembling those obtained from simulations with cold collisionless dark matter and baryons. The best fit Maxwellian distributions fit well with the local dark matter speed distributions in both cases. Inclusion of baryons increases the local dark matter density and shifts the dark matter speed distributions to higher speeds. Considering the implications for direct detection, the halo integrals obtained directly from the simulations are compared to those derived from the best fit Maxwellian velocity distribution, with the majority of halos showing good agreement with the Maxwellian distribution regardless of the dark matter self-interaction models.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Sasha R. Brownsberger, Lisa Randall
Summary: This study introduces a method to measure the correspondence between dark matter models and observations of stellar populations in dwarf galaxies without assuming a parametric stellar distribution. Through this method, researchers found the consistency of different shapes and distributions of dark matter models with stellar data, as well as their consistency with stellar positions and velocities. Interestingly, the Fornax dwarf spheroidal galaxy shows no evidence of a disc-like structure and exhibits some features that are inconsistent with predictions from Lambda cold dark matter with baryon simulations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Chris Kouvaris, Eleftherios Papantonopoulos, Lauren Street, L. C. R. Wijewardhana
Summary: Researchers discuss the potential for bosonic dark matter to form halos around the Sun or the Earth, and explore the use of atomic clocks to probe these halos. They focus on interactions between dark matter and the Standard Model, specifically the Higgs portal or photon portal, searching for parameter space where discernible frequency differences can be observed between clocks on Earth and in space. Bosonic dark matter halos surrounding the Earth could potentially be probed using current optical atomic clocks.
Article
Astronomy & Astrophysics
Bradley J. Kavanagh, Timon Emken, Riccardo Catena
Summary: Despite strong evidence for the existence of large amounts of dark matter in the Universe, there is no direct indication of its presence in our solar system. A new study demonstrates the possibility of measuring the local dark matter density and interaction cross section through direct detection experiments. This study suggests that future experiments may be able to reconstruct the local dark matter density with less than 50% uncertainty for sub-GeV dark matter with a large spin-independent DM-proton cross section.
Review
Physics, Multidisciplinary
Pablo F. de Salas, A. Widmark
Summary: This report summarizes progress made in estimating the local density of dark matter, discussing the range of results from local and global studies, as well as the importance of considering beyond the ideal Galaxy approximation. It also reviews evidence for local disequilibrium and broken symmetries in the present configuration of the Milky Way, and comments on new ideas proposed to further constrain the value of dark matter density.
REPORTS ON PROGRESS IN PHYSICS
(2021)
Article
Astronomy & Astrophysics
David Benisty, Anne-Christine Davis, N. Wyn Evans
Summary: This Letter presents a method to constrain the cosmological constant A from binary galaxies, specifically the Milky Way and Andromeda galaxies. An analytical solution to the two-body problem with Lambda is provided, and the importance of the cosmological constant effects is controlled by the ratio between the Keplerian period and T-Lambda = 2 pi/(c root Lambda) approximately equal to 63.2 Gyr. The Andromeda-Milky Way orbit has a period of about 17 Gyr, hence the consideration of dark energy. The upper bound of the cosmological constant value is found to be 5.44 times the value obtained by Planck using the current best mass estimates of the Milky Way and Andromeda galaxies. With future astrometric measurements, this bound can be reduced to (1.67 +/- 0.79)Lambda(PL). The results of this study offer new prospects for constraining Lambda on different scales and also provide a platform for testing alternative theories of gravity.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Mariangela Lisanti, Matthew Moschella, Nadav Joseph Outmezguine, Oren Slone
Summary: There are correlations between dark matter and baryons on galactic scales, which can be described by a scaling relation between observed and baryonic accelerations called the Mass Discrepancy Acceleration Relation (MDAR). The existence of this relation has led to theories proposing additional fundamental forces on baryons. However, recent results challenge the notion that a theory reproducing the MDAR is valid in the Milky Way, specifically in local dynamics and rotation curves between 5-18 kpc. This study examines the case of Superfluid Dark Matter and finds that a standard Cold Dark Matter (CDM) model is preferred over a static superfluid profile in terms of fitting the data, due to the overprediction of vertical accelerations by the superfluid model.
PHYSICS OF THE DARK UNIVERSE
(2023)
Article
Astronomy & Astrophysics
Cristina Mondino, Maxim Pospelov, Joshua T. Ruderman, Oren Slone
Summary: A new U(1) dark gauge group is coupled to the Standard Model through kinetic mixing, providing a dark matter candidate in the form of the dark Higgs field, which generates the mass of the dark photon. Conditions involving the mass of the dark Higgs, the kinetic mixing parameter, and the dark gauge coupling lead to a sufficiently metastable dark Higgs to serve as dark matter. Both freeze-in and freeze-out processes can result in viable dark Higgs dark matter with a sub-GeV mass and a specific range of kinetic mixing parameter.
Article
Astronomy & Astrophysics
Heinrich Steigerwald, Davi Rodrigues, Stefano Profumo, Valerio Marra
Summary: Residuals in the Hubble diagram at optical wavelengths and host galaxy stellar mass in SNe Ia are observed to correlate. Progenitor channels based on dark matter, including the proposal of triggering 'normal' SNe Ia with asteroid-mass PBHs, have attracted attention. A method to estimate the local DM density and velocity dispersion is presented, and a luminosity step is found in SN Ia progenitors based on high versus low DM density.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Rodrigo Alonso, Jakub Scholtz
Summary: It has been found that the abundance of dark matter may be sourced by the baryon/lepton asymmetry of the early Universe. Through the mechanism of the Goldstone field, initial conditions for dark matter can be dynamically generated, with predictions showing an inverse dependence on coupling. When combined with leptogenesis, a viable region of parameter space for dark matter production can be identified.
Article
Astronomy & Astrophysics
J. Runge, S. A. Walker, M. S. Mirakhor
Summary: The study examines the dark matter halo surrounding the nearby galaxy group NGC 1600 and finds that regardless of the assumed dark matter model profile, the halo concentration is an extreme outlier of the Lambda CDM c-M relation. This high concentration value makes NGC 1600 part of a select group of galaxy groups.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Sivertsson, J. Read, H. Silverwood, P. F. de Salas, K. Malhan, A. Widmark, C. F. P. Laporte, S. Garbari, K. Freese
Summary: This study evaluates the factors affecting the determination of the density of dark matter near the Sun (rho(DM, circle dot)), and finds that common approximations such as axisymmetry and a flat rotation curve can lead to significant systematic errors. However, including the tilt term and the rotation curve term in the analysis can provide an unbiased estimate of rho(DM, circle dot).
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Csaba Csaki, Sungwoo Hong, Gowri Kurup, Seung J. Lee, Maxim Perelstein, Wei Xue
Summary: The study focuses on dark matter models based on a gapped continuum, describing a mixture of states with continuous mass distribution using effective field theory. A specific weakly interacting continuum (WIC) model is considered, which successfully reproduces observed relic density and exhibits intriguing observational consequences such as continuous and cascade decays of dark matter states.
Article
Astronomy & Astrophysics
Philippe Brax, Kunio Kaneta, Yann Mambrini, Mathias Pierre
Summary: In this study, dark matter production is generalized to a two-metric framework where the physical metric coupling to the Standard Model is related to the gravitational dynamics metric. The research shows that this setup is naturally present in many Ultra Violet constructions and investigates dark matter production in the early Universe through scatterings off the thermal bath and radiative decay of the inflaton. Additionally, noninstantaneous reheating effects are taken into account at the end of inflation.
Article
Astronomy & Astrophysics
Maria J. Jimenez-Donaire, Toby Brown, Christine D. Wilson, Ian D. Roberts, Nikki Zabel, Sara L. Ellison, Mallory Thorp, Vicente Villanueva, Ryan Chown, Dhruv Bisaria, Alberto D. Bolatto, Alessandro Boselli, Barbara Catinella, Aeree Chung, Luca Cortese, Timothy A. Davis, Claudia D. P. Lagos, Bumhyun Lee, Laura C. Parker, Kristine Spekkens, Adam R. H. Stevens, Jiayi Sun
Summary: In this study, we aimed to understand the influence of galactic environment and gravitational interactions on the star formation process in the context of galaxy evolution. By observing the molecular gas content and star formation rate of 37 spiral galaxies in the Virgo cluster, we found a relationship between the two, although there are variations among different galaxies.
ASTRONOMY & ASTROPHYSICS
(2023)
Correction
Astronomy & Astrophysics
Nikki Zabel, Toby Brown, Christine D. Wilson, Timothy A. Davis, Luca Cortese, Laura C. Parker, Alessandro Boselli, Barbara Catinella, Ryan Chown, Aeree Chung, Tirna Deb, Sara L. Ellison, Maria J. Jimenez-Donaire, Bumhyun Lee, Ian D. Roberts, Kristine Spekkens, Adam R. H. Stevens, Mallory Thorp, Stephanie Tonnesen, Vicente Villanueva
ASTROPHYSICAL JOURNAL
(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: 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
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
Laurent Legrand, Pratika Dayal, Anne Hutter, Stefan Gottloeber, Gustavo Yepes, Maxime Trebitsch
Summary: Using the ASTRAEUS framework, the impact of environmental density and radiative feedback on the assembly of galaxies and their host halos during the Epoch of Reionization is explored. It is found that there is a specific environment where galaxies are most efficient at accreting dark matter, minor mergers contribute more to dark matter assembly at z=5, and radiative feedback suppresses star formation in low-mass galaxies in over-dense environments.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Shin-Jeong Kim, Se-Heon Oh, Jing Wang, Lister Staveley-Smith, Baerbel S. Koribalski, Minsu Kim, Hye-Jin Park, Shinna Kim, Kristine Spekkens, Tobias Westmeier, O. Ivy Wong, Gerhardt R. Meurer, Peter Kamphuis, Barbara Catinella, Kristen B. W. McQuinn, Frank Bigiel, Benne W. Holwerda, Jonghwan Rhee, Karen Lee-Waddell, Nathan Deg, Lourdes Verdes-Montenegro, Bi-Qing For, Juan P. Madrid, Helga Denes, Ahmed Elagali
Summary: We used ASKAP WALLABY pilot survey observations to study the H I gas kinematics of galaxy pairs in two clusters and a group. By comparing the H I properties of galaxy pair candidates with those of non-paired control galaxies, we found that the denser cluster environment likely affects the H I gas properties by decreasing the amplitude of the kinematically narrow H I gas and increasing the Toomre Q values. This effect is more pronounced for galaxy pairs in the cluster environment.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Barbara Catinella, Luca Cortese, Alfred L. Tiley, Steven Janowiecki, Adam B. Watts, Julia J. Bryant, Scott M. Croom, Francesco d'Eugenio, Jesse van de Sande, Joss Bland-Hawthorn, Amelia Fraser-McKelvie, Samuel N. Richards, Sarah M. Sweet, Daniel J. Pisano, Nickolas Pingel, Rebecca A. Koopmann, Dillion Cottrill, Meghan Hill
Summary: We present SAMI-HI, a survey of the atomic hydrogen content of 296 galaxies using integral field spectroscopy data from the SAMI Galaxy Survey. We compare rotational velocities obtained from optical and radio observations to show how systematic differences affect the slope and scatter of the stellar-mass and baryonic Tully-Fisher relations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ian D. Roberts, Toby Brown, Nikki Zabel, Christine D. Wilson, Aeree Chung, Laura C. Parker, Dhruv Bisaria, Alessandro Boselli, Barbara Catinella, Ryan Chown, Luca Cortese, Timothy A. Davis, Sara Ellison, Maria Jesus Jimenez-Donaire, Bumhyun Lee, Rory Smith, Kristine Spekkens, Adam R. H. Stevens, Mallory Thorp, Vincente Villanueva, Adam B. Watts, Charlotte Welker, Hyein Yoon
Summary: We analyze the cold-gas distributions in Virgo cluster galaxies using observations of molecular hydrogen (H-2) and atomic hydrogen (H-i). Our findings show that Virgo galaxies have larger H-i asymmetries compared to non-cluster galaxies, while H-2 asymmetries are only marginally larger. We observe a weak correlation between H-i and H-2 asymmetries over the entire sample, but a stronger correlation for galaxies strongly impacted by environmental perturbations. Additionally, we find excess molecular gas mass on the leading halves of the discs in H-i-tailed Virgo galaxies, accompanied by an excess in the star formation rate.
ASTRONOMY & ASTROPHYSICS
(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
Ajay Dev, Simon P. Driver, Martin Meyer, Sambit Roychowdhury, Jonghwan Rhee, Adam R. H. Stevens, Claudia del P. Lagos, Joss Bland-Hawthorn, Barbara Catinella, A. M. Hopkins, Jonathan Loveday, Danail Obreschkow, Steven Phillipps, Aaron S. G. Robotham
Summary: In this study, we determine the relation between atomic hydrogen (HI) and halo mass using data from the Arecibo Legacy Fast ALFA survey at the location of optically selected groups from the Galaxy And Mass Assembly (GAMA) survey. We find that the HI mass of the groups generally increases with halo mass, ranging from 1.3% at 10^11.6 solar masses to 0.4% at 10^13.7 solar masses. Our results are consistent with previous studies and mock observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Massimo Meneghetti, Weiguang Cui, Elena Rasia, Gustavo Yepes, Ana Acebron, Giuseppe Angora, Pietro Bergamini, Stefano Borgani, Francesco Calura, Giulia Despali, Carlo Giocoli, Giovanni Granata, Claudio Grillo, Alexander Knebe, Andrea V. Maccio, Amata Mercurio, Lauro Moscardini, Priyamvada Natarajan, Antonio Ragagnin, Piero Rosati, Eros Vanzella
Summary: Previous studies have found an excess in the estimated probability of galaxy-galaxy strong lensing in observed galaxy clusters compared to the theoretical predictions. In this study, the researchers analyzed a larger set of simulated galaxy clusters and investigated how different implementations of star formation and feedback in simulations affect the theoretical expectations. The results show that the probability for galaxy-galaxy strong lensing is higher in simulations with denser stellar cores, but the discrepancy with observations still persists.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Toby Brown, Ian D. Roberts, Mallory Thorp, Sara L. Ellison, Nikki Zabel, Christine D. Wilson, Yannick M. Bahe, Dhruv Bisaria, Alberto D. Bolatto, Alessandro Boselli, Aeree Chung, Luca Cortese, Barbara Catinella, Timothy A. Davis, Maria J. Jimenez-Donaire, Claudia D. P. Lagos, Bumhyun Lee, Laura C. Parker, Rory Smith, Kristine Spekkens, Adam R. H. Stevens, Vicente Villanueva, Adam B. Watts
Summary: This study investigates how the environment regulates the star formation cycle of satellite galaxies in the Virgo Cluster. The results show that environmental mechanisms, such as ram pressure stripping and starvation, play a significant role in quenching star formation in H i-poor galaxies.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Xuchen Lin, Jing Wang, Virginia Kilborn, Eric W. Peng, Luca Cortese, Alessandro Boselli, Ze-Zhong Liang, Bumhyun Lee, Dong Yang, Barbara Catinella, N. Deg, H. Denes, Ahmed Elagali, P. Kamphuis, B. S. Koribalski, K. Lee-Waddell, Jonghwan Rhee, Li Shao, Kristine Spekkens, Lister Staveley-Smith, T. Westmeier, O. Ivy Wong, Kenji Bekki, Albert Bosma, Min Du, Luis C. Ho, Juan P. Madrid, Lourdes Verdes-Montenegro, Huiyuan Wang, Shun Wang
Summary: Using data from ASKAP and ALFA, this study investigates the effect of ram pressure and tidal interactions in the NGC 4636 group. It finds that gas stripping is widespread in this group, affecting 80% of nonmerging galaxies and 41% are experiencing both types of stripping. The strengths of these effects are correlated with H i-disk shrinkage and the tidal strength is related to the reddening of low-mass galaxies.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
N. Deg, R. Palleske, K. Spekkens, J. Wang, T. Jarrett, J. English, X. Lin, J. Yeung, J. R. Mould, B. Catinella, H. Denes, A. Elagali, B. -Q For, P. Kamphuis, B. S. Koribalski, K. Lee-Waddell, C. Murugeshan, S. Oh, J. Rhee, P. Serra, T. Westmeier, O. Wong, K. Bekki, A. Bosma, C. Carignan, B. W. Holwerda, N. Yu
Summary: This article reports the discovery of two potential polar ring galaxies (PRGs) in the WALLABY Pilot Data Release 1 (PDR1) and analyzes and models them using virtual reality software. The results suggest that these galaxies may be PRGs and that the WALLABY survey has the potential to detect more new PRGs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Adam B. Watts, Luca Cortese, Barbara Catinella, Toby Brown, Christine D. Wilson, Nikki Zabel, Ian D. Roberts, Timothy A. Davis, Mallory Thorp, Aeree Chung, Adam R. H. Stevens, Sara L. Ellison, Kristine Spekkens, Laura C. Parker, Yannick M. Bahe, Vicente Villanueva, Maria Jimenez-Donaire, Dhruv Bisaria, Alessandro Boselli, Alberto D. Bolatto, Bumhyun Lee
Summary: The quenching of cluster satellite galaxies is closely related to the suppression of their cold interstellar medium (ISM) by environmental mechanisms. While the removal of neutral atomic hydrogen (H I) at large radii is well studied, how the environment impacts the remaining gas in the centres of galaxies, which are dominated by molecular gas, is less clear.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
(2023)
