RAS_WEB (Page 33)

How robust are the parameter constraints extending the $Lambda$CDM model? Stefano Gariazzo, William Giar`e, Olga Mena, Eleonora Di Valentino arXiv:2404.11182v1 Announce Type: new Abstract: We present model-marginalized limits on the six standard $Lambda$CDM cosmological parameters ($Omega_{rm c} h^2$, $Omega_{rm b} h^2$, $theta_{rm MC}$, $tau_{rm reio}$, $n_s$ and $A_s$), as well as on selected derived quantities ($H_0$, $Omega_{rm m}$, $sigma_8$, $S_8$ and $r_{rm drag}$), obtained by considering three independent Cosmic Microwave Background (CMB) experiments: the Planck satellite, the Atacama Cosmology Telescope, and South Pole Telescope. We also consider low redshift observations in the form of Baryon Acoustic Oscillation (BAO) data from the SDSS-IV eBOSS survey andRead More →

Hubble Expansion Signature on Simulated Halo Density Profiles: A Path to Observing the Turnaround Radius Giorgos Korkidis, Vasiliki Pavlidou arXiv:2404.11183v1 Announce Type: new Abstract: Density profiles are important tools in galaxy cluster research, offering insights into clusters dynamical states and their relationship with the broader Universe. While these profiles provide valuable information about the matter content of the Universe, their utility in understanding its dark energy component has remained limited due a lack of tools allowing us to study the transition from cluster portions that are relaxed and infalling, to those that are merging with the Hubble flow. In this work we investigate signatures ofRead More →

The puzzling orbital residuals of XTE J1710-281: is a Jovian planet orbiting around the binary system? R. Iaria, T. Di Salvo, A. Anitra, C. Miceli, W. Leone, C. Maraventano, F. Barra, A. Riggio, A. Sanna, A. Manca, L. Burderi arXiv:2404.11203v1 Announce Type: new Abstract: XTE J1710-281 is a transient eclipsing binary system with a period close to 3.28 hours, hosting a neutron star. The average eclipse duration is 420 seconds, and eclipse arrival times reported in the literature span from 1999 to 2017. A previous analysis of the eclipse arrival times using the eclipse timing technique revealed a complex pattern of delays, indicating the presenceRead More →

Closeby Habitable Exoplanet Survey (CHES). I. Astrometric Noise and Planetary Detection Efficiency due to Stellar Spots and Faculae Chunhui Bao, Jianghui Ji, Dongjie Tan, Guo Chen, Xiumin Huang, Su Wang, Yao Dong arXiv:2404.11210v1 Announce Type: new Abstract: The Closeby Habitable Exoplanet Survey (CHES) is dedicated to the astrometric exploration for habitable-zone Earth-like planets orbiting solar-type stars in close proximity, achieving unprecedented micro-arcsecond precision. Given the elevated precision, thorough consideration of photocenter jitters induced by stellar activity becomes imperative. This study endeavors to model the stellar activity of solar-type stars, compute astrometric noise, and delineate the detection limits of habitable planets within the astrometric domain. SimulationsRead More →

Identifying coronal sources of L1 solar wind disturbances using the Fisk heliospheric magnetic field and potential field extrapolations during three solar minima P. J. Steyn, D. Johnson, G. J. J. Botha, S. R’egnier arXiv:2404.11219v1 Announce Type: new Abstract: The solar minima between solar cycles 22-23, 23-24 and 24-25 are the best observed minima on record. In situ solar wind and interplanetary magnetic field measurements by the WIND and ACE spacecraft at L1 with one-hour cadence are explored using wavelet analyses for the most quiescent year during each minimum. Times of local peaks in periodicities are identified in the solar wind velocity, magnetic field components, andRead More →

Physics of nova outbursts: Theoretical models of classical nova outbursts with optically thick winds on $1.2~M_odot$ and $1.3~M_odot$ white dwarfs Mariko Kato, Hideyuki Saio, Izumi Hachisu arXiv:2404.11237v1 Announce Type: new Abstract: We present time-dependent nova outburst models with optically thick winds for a 1.2 and 1.35 $M_odot$ white dwarfs (WDs) with a mass accretion rate of $5 times 10^{-9}~M_odot$ yr$^{-1}$ and for a 1.3 $M_odot$ WD with $2 times 10^{-9}~M_odot$ yr$^{-1}$. The X-ray flash occurs 11 days before the optical peak of the 1.2 $M_odot$ WD and 2.5 days before the peak of the 1.3 $M_odot$ WD. The wind mass loss rate of the 1.2Read More →

Turbulence revealed by wavelet transform: power spectrum and intermittency for the velocity field of the cosmic baryonic fluid Yun Wang, Ping He arXiv:2404.11255v1 Announce Type: new Abstract: We use continuous wavelet transform techniques to construct the global and environment-dependent wavelet statistics, such as energy spectrum and kurtosis, to study the fluctuation and intermittency of the turbulent motion in the cosmic fluid velocity field with the IllustrisTNG simulation data. We find that the peak scales of the energy spectrum and the spectral ratio define two characteristic scales, which can be regarded as the integral scale and the dissipation scale of turbulence, respectively, so that the energyRead More →

WISDOM Project — XXIV. Cross-checking supermassive black hole mass estimates from ALMA CO gas kinematics and SINFONI stellar kinematics in the galaxy NGC 4751 Pandora Dominiak, Michele Cappellari, Martin Bureau, Timothy A. Davis, Marc Sarzi, Ilaria Ruffa, Satoru Iguchi, Thomas G. Williams, Hengyue Zhang arXiv:2404.11260v1 Announce Type: new Abstract: Supermassive black hole (SMBH) masses can be measured by observing the impacts of the SMBHs on dynamical tracers around them. We present high angular resolution ($0.19$ arcsec or $approx24$ pc) Atacama Large Millimeter/submillimeter Array observations of the $^{12}$CO(3-2) line emission of the early-type galaxy NGC 4751, which reveal a highly-inclined regularly-rotating molecular gas disc with clearRead More →

Robust parameter estimation within minutes on gravitational wave signals from binary neutron star inspirals Thibeau Wouters, Peter T. H. Pang, Tim Dietrich, Chris Van Den Broeck arXiv:2404.11397v1 Announce Type: new Abstract: The gravitational waves emitted by binary neutron star inspirals contain information on nuclear matter above saturation density. However, extracting this information and conducting parameter estimation remains a computationally challenging and expensive task. Wong et al. introduced Jim arXiv:2302.05333, a parameter estimation pipeline that combines relative binning and jax features such as hardware acceleration and automatic differentiation into a normalizing flow-enhanced sampler for gravitational waves from binary black hole (BBH) mergers. In this work, weRead More →

Directional Filter Design and Simulation for Superconducting On-chip Filter-banks Louis H. Marting, Kenichi Karatsu, Akira Endo, Jochem J. A. Baselmans, Alejandro Pascual Laguna arXiv:2404.11417v1 Announce Type: new Abstract: Many superconducting on-chip filter-banks suffer from poor coupling to the detectors behind each filter. This is a problem intrinsic to the commonly used half wavelength filter, which has a maximum theoretical coupling of 50 %. In this paper we introduce a phase coherent filter, called a directional filter, which has a theoretical coupling of 100 %. In order to to study and compare different types of filter-banks, we first analyze the measured filter frequency scatter, losses, andRead More →

Non-linear power spectrum and forecasts for Generalized Cubic Covariant Galileon Lu’is Atayde, Noemi Frusciante, Benjamin Bose, Santiago Casas, Baojiu Li arXiv:2404.11471v1 Announce Type: new Abstract: To fully exploit the data from next generation surveys, we need an accurate modelling of the matter power spectrum up to non-linear scales. Therefore in this work we present the halo model reaction framework for the Generalized Cubic Covariant Galileon (GCCG) model, a modified gravity model within the Horndeski class of theories which extends the cubic covariant Galileon (G3) by including power laws of the derivatives of the scalar field in the K-essence and cubic terms. We modify the publiclyRead More →

Impact of lensing of gravitational waves on the observed distribution of neutron star masses Sofia Canevarolo, Loek van Vonderen, Nora Elisa Chisari arXiv:2404.11480v1 Announce Type: new Abstract: The distribution of masses of neutron stars, particularly the maximum mass value, is considered a probe of their formation, evolution and internal physics (i.e., equation of state). This mass distribution could in principle be inferred from the detection of gravitational waves from binary neutron star mergers. Using mock catalogues of $10^5$ dark sirens events, expected to be detected by Einstein Telescope over an operational period of $sim1, rm year$ , we show how the biased luminosity distance measurementRead More →

Assessment of SDSS-Derived Galaxy Morphologies Using HST Imaging Chandler Osborne, Samir Salim arXiv:2404.11485v1 Announce Type: new Abstract: The Sloan Digital Sky Survey (SDSS) was foundational to the study of galaxy evolution, having revealed the bimodality of galaxies and the relationship between their structure and star-forming activity. However, ground-based optical surveys like SDSS are limited in resolution and depth which may lead to biases or poor quality in the derived morphological properties, potentially impacting our understanding of how and why galaxies cease their star formation (quench). We use archival HST imaging of ~2,000 SDSS objects to assess the reliability of SDSS-derived morphologies, taking advantage of bothRead More →