Article
Astronomy & Astrophysics
Mihir Kulkarni, Jeremiah P. Ostriker
Summary: Fuzzy dark matter, composed of ultra-light axions, is an alternative theory designed to address the small-scale problems faced by the standard cold dark matter proposal. It alleviates some of the apparent discrepancies faced by the standard ACDM paradigm.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. D. Amaral, T. Vernstrom, B. M. Gaensler
Summary: Researchers conducted an analysis on the statistical characteristics of weak magnetic fields in the intergalactic medium, but did not detect a significant correlation signal. They determined model-dependent upper limits on the parallel magnetic field strength of filaments in the IGM, and noted that these results are consistent with previous findings.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Theo Simon, Guillermo Abellan, Peizhi Franco Du, Vivian Poulin, Yuhsin Tsai
Summary: In this study, we updated the cosmological constraints on two decaying dark matter models using BOSS-DR12 data and the EFTofLSS framework. The results showed that Planck data contributed the most to these constraints, and EFTofBOSS data significantly improved the constraints on the lifetime of decayed dark matter. Furthermore, we found that adjusting S-8 to match KiDS-1000 required a longer lifetime and a larger kick velocity.
Article
Astronomy & Astrophysics
Ginevra Favole, Benjamin R. Granett, Javier Silva Lafaurie, Domenico Sapone
Summary: The study investigates the jackknife method for internal covariance estimation in large-scale structure surveys, exploring the impact of jackknife size and number of resamplings on the precision of the covariance estimate and errors in cosmological parameters. Results show that the baryon acoustic scale error estimate is independent of the jackknife scale, while the shift parameter a exhibits variations in error estimates from different datasets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Hua-Yu Yang, Yun Wang, Ping He, Weishan Zhu, Long-Long Feng
Summary: The research finds differences in the density power ratio between dark matter and baryonic matter in different simulations, especially with a more severe suppression of baryonic power spectrum in WIGEON simulations at small scales, while TNG simulations show an increase in power spectrum ratios within a certain scale range.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
G. Parimbelli, E. Branchini, M. Viel, F. Villaescusa-Navarro, J. ZuHone
Summary: In this study, we use simulations to model the surface brightness maps of OVII and OVIII ion lines and compute summary statistics to infer the properties of the warm-hot intergalactic medium (WHIM). Our findings confirm that detectable WHIM emission is primarily associated with galaxy haloes, and the WHIM properties show minimal evolution over time. By exploring different parameters, we investigate the sensitivity of WHIM properties to cosmology and energy feedback mechanisms. Additionally, we provide forecasts for WHIM observations using a spectrometer similar to X-IFU, anticipating the detection of multiple emission lines per pixel. Overall, our work demonstrates the potential of emission studies to probe the densest phase of the WHIM and shed light on its physical properties.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
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
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
Andrea Maccio, Daniel Huterer Prats, Keri L. Dixon, Tobias Buck, Stefan Waterval, Nikhil Arora, Stephane Courteau, Xi Kang
Summary: Through simulations, it has been shown that dwarf galaxies can lose up to 80% of their dark matter content and see a significant change in the dark matter-to-stellar mass ratio after interactions with central galaxies. These findings align with observations of NGC 1052-DF2 and NGC 1054-DF4.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
Supranta S. Boruah, Guilhem Lavaux, Michael J. Hudson
Summary: We propose a Bayesian velocity field reconstruction algorithm that uses only peculiar velocity data to reconstruct the mass density field. Our method takes into account the inhomogeneous Malmquist bias and is validated through simulations. We show that our method provides an unbiased reconstruction of the velocity field and is able to obtain a cosmological power spectrum consistent with theoretical expectations. Additionally, we compare our results with independent reconstructions and demonstrate the effectiveness of our method in the local Universe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Erwin T. Lau, Andrew P. Hearin, Daisuke Nagai, Nico Cappelluti
Summary: This study explores the correlations between the triaxial shapes and formation histories of dark matter haloes, revealing a strong correlation between halo ellipticity and properties indicative of halo formation history. These correlations remain largely unchanged regardless of halo density peak height. A simple model is proposed for the correlation between halo ellipticity and concentration, providing fitting formulae for the multidimensional distribution of triaxial halo shapes based on halo peak height. The halo shape model is applied to assess the impact of halo ellipticity and orientation bias on excess surface mass density profiles in cluster-sized haloes, and may be useful for understanding the influence of triaxial halo shape on cosmological constraints in upcoming weak lensing surveys of galaxy clusters.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
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
Daria Zakharova, Benedetta Vulcani, Gabriella De Lucia, Lizhi Xie, Michaela Hirschmann, Fabio Fontanot
Summary: This study investigates the properties of filaments and compares the methods of extracting filaments using dark matter distribution and model galaxy distribution. The results show that filaments extracted using different tracers are generally consistent but never coincide completely. Additionally, the number of filaments identified using galaxy distribution in massive clusters is typically underestimated.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
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
Jens Stucker, Raul E. Angulo, Oliver Hahn, Simon D. M. White
Summary: Our 'sheet + release' simulations effectively track the evolution of dark matter structure below the free-streaming scale, addressing the issues of spurious artificial haloes in traditional N-body simulations. The simulations cover a wide range of power-spectrum cutoff functions, representing various non-cold dark matter models. Through combining these simulations with additional N-body simulations, we find that the halo mass function in the strongly suppressed regime remains uncertain, but the regime with suppression smaller than a factor of 20 is robust and can be reliably inferred. Additionally, we provide simple formulae to predict the behavior of many NCDM models based on the scales of suppression in halo- and subhalo mass functions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jolanta Zjupa, Bjorn Malte Schaefer, Oliver Hahn
Summary: This study tests the linear and quadratic models for intrinsic alignments by using morphologically selected samples of galaxies. The results show a significant alignment signal for elliptical galaxies, which increases with mass and redshift. On the other hand, spiral galaxies only exhibit a significant signal for the most massive objects, and the quadratic model breaks down for spiral galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Oliver Friedrich, Anik Halder, Aoife Boyle, Cora Uhlemann, Dylan Britt, Sandrine Codis, Daniel Gruen, ChangHoon Hahn
Summary: This article studies the connection between matter density and its tracers from the perspective of probability density function (PDF), including the conditional expectation value.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Alex Gough, Cora Uhlemann
Summary: The probability distribution function (PDF) of matter contains significant non-Gaussian information that can be used to probe modifications of gravity or expansion history. Combining the matter PDF with the power spectrum can substantially reduce parameter uncertainties and increase the detection significance of departures from General Relativity.
Article
Astronomy & Astrophysics
T. R. G. Richardson, J. Stucker, R. E. Angulo, O. Hahn
Summary: Anomalies in the flux ratios of quadruply-lensed quasars have been used to constrain the nature of dark matter. However, other structures besides dark matter haloes, such as filaments and pancakes, may also contribute significantly to the lensing signal. The study finds that these non-halo structures can have a greater impact on the flux-ratio observations than all haloes combined, reducing the differences expected among Warm Dark Matter models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Matteo Cataneo, Cora Uhlemann, Christian Arnold, Alex Gough, Baojiu Li, Catherine Heymans
Summary: In this study, an analytical description of the probability distribution function (PDF) of the smoothed 3D matter density field for modified gravity and dark energy is presented. The approach is based on Large Deviations Theory and is applicable to various extensions of the standard cosmology. The results show high accuracy in the mildly non-linear regime and demonstrate the power of combining measurements of the 3D matter PDF with the 3D matter power spectrum.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Ricarda S. Beckmann, Yohan Dubois, Alisson Pellissier, Valeria Olivares, Fiorella L. Polles, Oliver Hahn, Pierre Guillard, Matthew D. Lehnert
Summary: One possible way to prevent strong cooling flows in galaxy clusters is by converting a fraction of the energy from the central active galactic nucleus (AGN) into cosmic rays (CRs). This study investigates how CRs injected by the AGN jet influence cooling flows of a massive galaxy cluster through magneto-hydrodynamical simulations. The results show that converting as low as 10% of the AGN luminosity into CR energy can prevent cooling flows for billions of years.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Cornelius Rampf, Sonja Ornella Schobesberger, Oliver Hahn
Summary: The study solves the non-linear fluid equations to arbitrary high perturbative orders, revealing the significant impact of the cosmological constant ? starting from the fifth order in the expansion of linear density fluctuations. The refined growth functions proposed in the research can reduce theoretical uncertainties in data analysis and have precision below one per cent for power- and bispectra at late times.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Clement Stahl, Thomas Montandon, Benoit Famaey, Oliver Hahn, Rodrigo Ibata
Summary: This article investigates the effects of small-scale primordial non-Gaussianity on structure formation and galaxy formation processes. The study finds that different types of non-Gaussianity lead to distinct features in the matter power spectrum at non-linear scales, which could potentially impact the S-8 tension. The research shows that large amplitude non-Gaussianities result in galaxy-sized halos reaching half of their present-day mass earlier and having a quieter merging history at z <3. Additionally, the environments of these halos are less dense compared to the Gaussian case, suggesting potential consequences for the formation of bulges and bars.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Alessandra Mastrobuono-Battisti, Go Ogiya, Oliver Hahn, Mathias Schultheis
Summary: Galaxy mergers can lead to the formation of supermassive black hole binaries, especially when the black holes are embedded in a nuclear star cluster. This study demonstrates that the structural and dynamical properties of the cluster can be used to identify recently merged galaxies with potential central supermassive black hole binaries. Mergers can affect the shape, density profile, rotation, and velocity structure of the cluster, depending on the mass ratio and initial conditions of the merger. Additionally, mergers may contribute to the formation of the nuclear stellar disc in the galaxy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Alisson Pellissier, Oliver Hahn, Chiara Ferrari
Summary: We present the RHAPSODY-C simulations that extend the RHAPSODY-G suite of massive galaxy clusters, including anisotropic thermal conduction, modified SMBH feedback, new SMBH seeding, and SMBH orbital decay model. These modelling improvements dramatically affect SMBH growth, star formation, and gas depletion in proto-clusters. By exploring the parameter space, we report the impact of these models on star formation and the thermodynamics of the ICM as observed in X-ray and SZ observations. Despite differences in stellar and gaseous content, our findings are consistent with recent observational and numerical studies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Biochemistry & Molecular Biology
Fabian Kern, Thomas Kuhn, Nicole Ludwig, Martin Simon, Laura Groeger, Natalie Fabis, Ernesto Aparicio-Puerta, Abdulrahman Salhab, Tobias Fehlmann, Oliver Hahn, Annika Engel, Viktoria Wagner, Marcus Koch, Katarzyna Winek, Hermona Soreq, Irina Nazarenko, Gregor Fuhrmann, Tony Wyss-Coray, Eckart Meese, Verena Keller, Matthias W. Laschke, Andreas Keller
Summary: Previous studies have shown that RNA molecules exhibit global and tissue-specific ageing patterns in both murine models and humans. In this study, we focused on extracellular vesicles (EVs), which are membrane vesicles that mediate the transfer of genetic information between tissues. We sequenced small regulatory RNAs (sncRNAs) in two fractions of mouse plasma at different time points, and observed unique ageing patterns in different sncRNA classes between the free-circulating (fc-RNA) and EV-bound (EV-RNA) fractions. Furthermore, we found that miR-29 family in adipose tissues, particularly in the EV-RNA fraction, was strongly associated with ageing.
Article
Astronomy & Astrophysics
Cornelius Rampf, Oliver Hahn
Summary: Using the exact parametric solution, we develop two asymptotic methods in spherical symmetry that achieve higher accuracy in resolving the gravitational evolution compared to Lagrangian perturbation theory (LPT). One method predicts the critical exponent of the phase transition to collapsed structures by selecting a stable fixed-point solution of the renormalization-group flow equation. The other method completes the truncated LPT series by adding a nonanalytic term that captures the critical nature of gravitational collapse. Both methods accurately resolve the nonlinear density evolution and yield new formulas for relating linear and nonlinear density contrasts.
Article
Astronomy & Astrophysics
Alexandre Barthelemy, Francis Bernardeau, Sandrine Codis, Cora Uhlemann
Summary: In tomographic cosmic shear surveys, a nulling transformation simplifies the correlation structure and enables accurate predictions of the one-point distribution. This transformation reduces numerical complexity and facilitates joint PDF estimation.