🔭 Category

astro-ph

1092 papers

A MaNGA about the Legacy I: Connecting the Assembly of Stellar Halo with the Average Star Formation History in Low-Redshift Massive Galaxies

By combining deep LegacySurvey imaging with MaNGA spectroscopy, this study reveals that the assembly history of low-redshift massive early-type galaxies is intricately linked to their central gravitational potential and outer stellar halos, demonstrating that distinct imprints of both in-situ star formation and ex-situ accretion shape their stellar populations beyond simple scaling relations.

Xiao-Ya Zhang, Song Huang, Meng Gu2026-03-04🔭 astro-ph

Web-Halo Model (WHM): Accurate non-linear matter power spectrum predictions without free parameters

The authors introduce the Web-Halo Model (WHM), a parameter-free framework that integrates collapsed structures like filaments and sheets with 1-loop Lagrangian Perturbation Theory to achieve sub-2% accuracy in predicting the non-linear matter power spectrum across various redshifts and cosmologies, outperforming existing models like HMcode-2020 without requiring any free fitting parameters.

Samuel Brieden, Florian Beutler, Marcos Pellejero-Ibañez2026-03-04🔭 astro-ph

Efficient black hole seed formation in low metallicity and dense stellar clusters with implications for JWST sources

Using direct N-body and Monte Carlo simulations, this study demonstrates that extremely dense, low-metallicity young massive clusters observed by JWST inevitably undergo runaway stellar collisions to form very massive stars, which rapidly collapse into intermediate-mass black hole seeds of $10^3––10^5 M_\odot$, providing a viable pathway for early black hole formation and explaining high-redshift nitrogen abundances.

M. C. Vergara, A. Askar, F. Flammini Dotti + 7 more2026-03-04🔭 astro-ph

Hillas meets Eddington: The case for blazars as ultra-high-energy neutrino sources

This paper presents a new physically motivated, multi-zone leptohadronic model demonstrating that sub-Eddington blazar jets can efficiently accelerate protons to EeV energies to produce the ultra-high-energy neutrino fluxes observed by IceCube and KM3NeT, such as those from TXS 0506+056 and PKS 0605-085, while remaining consistent with multi-wavelength emission data and energy budget constraints.

Xavier Rodrigues, Frank Rieger, Artem Bohdan + 1 more2026-03-04🔭 astro-ph

Identifying massive black hole binaries via light curve variability in optical time-domain surveys

This study simulates the detection of massive black hole binaries in the LSST survey by generating realistic optical light curves from hydrodynamic accretion models, revealing that LSST can identify approximately 0.01–0.1 such systems per square degree, with periodogram analysis showing a higher success rate for detecting binaries with high eccentricities and unequal mass ratios.

Alfredo Chiesa, David Izquierdo-Villalba, Alberto Sesana + 5 more2026-03-04🔭 astro-ph

Can an Anti-de Sitter Vacuum in the Dark Energy Sector Explain JWST High-Redshift Galaxy and Reionization Observations?

This study demonstrates that while an anti-de Sitter vacuum in the dark energy sector can enhance early structure formation, it fails to simultaneously explain the JWST high-redshift galaxy excess and satisfy cosmological constraints from the CMB and low-redshift probes, thereby reinforcing the necessity of evolving astrophysical properties to resolve the tension.

Anirban Chakraborty, Tirthankar Roy Choudhury, Anjan Ananda Sen + 1 more2026-03-04🔭 astro-ph

Rapid jet production and suppression during fast state transitions in the black hole X-ray binary MAXI J1348−-630

This study reveals that a brief radio re-brightening in the black hole X-ray binary MAXI J1348−-630 coincided with increased X-ray variability and the launch of two relativistic ejecta, suggesting a complex dynamic coupling where short-lived compact jets are reactivated and quenched during a hard-intermediate state transition preceding discrete ejections.

Francesco Carotenuto, Liang Zhang, Diego Altamirano + 3 more2026-03-04🔭 astro-ph

COSMOS-Web galaxy groups: Evolution of red sequence and quiescent galaxy fraction

This study analyzes COSMOS-Web galaxy groups from z=0 to z=3.7 using machine learning and multi-method approaches to reveal that quiescent galaxy fractions build up steadily from z=1.5–2 with earlier growth in richer groups, identifies a rare overdensity at z=3.4, and finds that while X-ray faint groups have lower quiescent fractions, the red sequence's slope and scatter remain stable over approximately 12 billion years.

Greta Toni, Matteo Maturi, Gianluca Castignani + 33 more2026-03-04🔭 astro-ph

eROSITA-selection of new period-bounce Cataclysmic Variables: First follow-up confirmation using TESS and SDSS

This paper presents a new selection method using eROSITA X-ray data and optical catalogs to identify period-bounce cataclysmic variables, successfully confirming six new systems (including one previously unknown) with TESS and SDSS follow-up, thereby increasing the known population of these rare objects by 18% to 39.

Daniela Muñoz-Giraldo, Beate Stelzer, Axel Schwope + 3 more2026-03-04🔭 astro-ph

Linking Young Stellar Object Morphology to Evolutionary Stages with Self-Organizing Maps

This study utilizes Self-Organizing Maps on VISTA near- and mid-infrared images of approximately 10,000 Young Stellar Objects in the Orion complex to create a non-theoretical, data-driven grid of morphological prototypes and probabilistic maps linking these morphologies to evolutionary stages, thereby establishing a foundation for a novel spectro-morphological classification scheme.

David Hernandez, Odysseas Dionatos, Marc Audard + 5 more2026-03-04🔭 astro-ph

Analytical modeling of polarization signals arising from confined circumstellar material in Type II supernovae

This paper presents an analytical model demonstrating that the time evolution of polarization signals in Type II supernovae with confined circumstellar material can be used to constrain the disk's geometric and physical parameters, successfully applying this framework to explain the observations of SN 2023ixf and thereby offering insights into the mass-loss mechanisms of massive stars.

T. Nagao, K. Maeda, T. Matsumoto2026-03-04🔭 astro-ph

Non-explosive pre-supernova feedback in the COLIBRE model of galaxy formation

This paper presents and validates a non-explosive pre-supernova (NEPS) feedback module within the COLIBRE galaxy formation model, demonstrating that incorporating momentum injection and photoheating from young massive stars effectively regulates star formation, improves numerical convergence, and synergistically enhances the efficacy of subsequent supernova feedback.

Alejandro Benítez-Llambay, Sylvia Ploeckinger, Joop Schaye + 7 more2026-03-04🔭 astro-ph