Astrophysics · Physics & Astronomy
Cosmology & Nongalactic Astrophysics
The newest papers in Cosmology & Nongalactic Astrophysics that ReadSearch has read, newest first. Each links to its own page, with its authors, date, where it was published and the original.
206 papers, from 6 September 2026 to 5 November 2026: 206 arXiv preprints.
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Newest papers, page 8
The Virgo Cluster as a Case Study for Ancient Cosmic Ray Halos in Radio and X-rays
Virgo is the nearest cool core (CC) galaxy cluster, and is archetypal of the class of X-ray weak CCs.Baryonic Imprints on DM Halos: characterizing the full concentration-mass probability distribution with CAMELS
The halo concentration, which represents the distribution of matter within a halo, is a vital tool for modeling the matter distribution on scales ranging from megaparsecs to sub-kiloparsecs.Stars Would Remember a Recent Gravitational Transition: Testing G-step Resolutions of the Hubble Tension with Red Dwarfs
We test the hypothesis that Newton's gravitational constant underwent a rapid transition approximately $73$-$130\,{\rm Myr}$ ago, as proposed in some resolutions of the Hubble tension.Do Submillimeter Galaxies Trace Megaparsec Large-scale Structures? -- An Overdensity Analysis of 449 Submillimeter Galaxies in COSMOS
We present an environmental analysis and overdensity catalog for a large sample of submillimeter galaxies (SMGs) in the COSMOS field in order to understand whether SMGs are signposts of…Weighing Galaxies Inside-Out: Small-Scale Lensing and the Stellar Mass Problem
Small-scale galaxy-galaxy weak lensing provides an independent way to probe the stellar initial mass function by constraining the matter distribution within galaxies.Inferring magnetic field strengths in high-redshift lensing galaxies from Faraday rotation measure observations
Observations of Faraday rotation in the lensing galaxy of CLASS B1152+199 at z = 0.439 suggest that efficient dynamo mechanisms had already amplified galactic magnetic fields by this epoch.Collapse-accelerated small-scale dynamos in the first stars and galaxies
Here, we explore magnetic field amplification by the small-scale dynamo (SSD) during the formation of the first stars and galaxies.Stacked strong and weak lensing united: Improved measurement of the stellar and dark matter distributions in massive early-type galaxies at $z\sim 0.5$
We present a new measurement of the stellar and dark matter distributions in massive early-type galaxies at redshift $0.4<z<0.6$ by combining stacked strong and weak lensing measurements.The impact of primordial magnetic fields on the formation of galaxies
Primordial magnetic fields (PMFs), potentially generated during cosmic inflation or early-universe phase transitions, can modify cosmic structure formation by enhancing the post-recombination matter…When Streams Curve Away: a Test of Dark Matter from Extragalactic Stellar Stream Populations
The nature of dark matter sets the shape of galactic halos: collisionless cold dark matter (CDM) predicts triaxial halos, while scattering in self-interacting dark matter (SIDM) rounds them toward…Probing the Reionization History and Bubble Sizes with JWST Lyman-$α$ Fraction Measurements
Recent James Webb Space Telescope (JWST) measurements quantify the fraction of ultraviolet-selected galaxies showing detectable Lyman-alpha (Ly-$α$) lines at $z \sim 6-14$.LIGHTS. Limitations of Far-Infrared Tracers for Galactic Cirrus Mitigation in the Era of Ultra-Deep Imaging
Current and forthcoming deep optical imaging surveys are reaching surface brightness levels fainter than 30 mag/arcsec$^2$, where Galactic cirrus emission becomes a significant contaminant.Everything Everywhere All At Once: A Hierarchical Framework for Mapping Anisotropies in the Local Universe
We present a Bayesian hierarchical forward model for mapping the local luminosity-density field from heterogeneous redshift surveys.An Ionized Superstructure at Cosmic Dawn Revealed by a Foundation Model for Astrophysical Research
The spatial structure of cosmic reionization remains poorly constrained.Population search for dark matter spikes in megamaser rotation curves
A black hole growing adiabatically inside a dark matter halo is expected to develop a dense spike, with a power-law slope between 1.5 and 2.5, depending on redshift and baryonic activity.The Irreversible Depletion of Dark Matter Spikes by Extreme-Mass-Ratio Inspirals
Dense dark matter spikes around massive black holes (MBHs) have been widely predicted to produce gravitational-wave dephasing in extreme-mass-ratio inspirals (EMRIs) that are potentially observable…A Full-Sky SPHEREx Map of Integrated 3.3 and 3.4 μm PAH Emission
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the interstellar medium and are among its smallest carbonaceous grains.Searching for BSM Experimental Signatures with Large Lagrangian Models
The search for physics Beyond the Standard Model (BSM) is generally limited not by the supply of theory descriptions but by the lack of discriminating experimental observations.Testing Offsets Between Cluster-Scale Halos and BCGs in Strong Lensing Models Using the Jackknife Method
Offsets between cluster-scale dark matter halos and brightest cluster galaxies (BCGs) inferred from strong lensing (SL) models have been used to investigate cluster dynamics and dark matter physics.KiDS-DR5: Exploring dust transport in dark matter halos of galaxies
We analyse a well-defined sample of galaxies from the final data release of the Kilo-Degree Survey (KiDS-DR5), selected using magnitude, photometric redshift, and stellar mass cuts, to measure their…