Wenxiao Xue | Searcharxiv

arXiv2025

Quantifying the Relationship Between Galaxy Specific Star Formation Rate And Halo Spin For Star-forming Galaxies

Utilizing ALFALFA HI data, we investigate the relationship between specific star formation rate (sSFR) and halo spin across various star-forming galaxies. Our analysis reveals weak yet statistically significant positive correlation between sSFR and halo spin, irrespective of the galactic environment. This trend suggests that galaxies with higher spin parameters tend to host dynamically colder, gas-rich disks, sustaining elevated gas surface densities and prolonged star formation. These findings align with theoretical expectations of angular momentum-regulated gas accretion but highlight discrepancies with cosmological simulations, underscoring unresolved challenges in modeling baryonic feedback and star formation efficiency.

astro-ph.GA↗

arXiv2025

Lack of Bulge Alignment in Late-type Galaxies with Large-scale Filaments Plausibly Unveils a Radial Migration Formation Scenario

The formation sequence of bulges and disks in late-type galaxies (LTGs) remains debated. While some theories suggest bulges form before disks, others propose the reverse. To address this, we analyze a bulge+disk decomposition catalog from the Sloan Digital Sky Survey, examining the alignment between central bulge major axes and large-scale filaments. For LTGs near filament spines, no significant alignment is found. However, LTGs farther from filaments show a marginal ($\sim 1σ$) perpendicular alignment. Notably, central bulges and outer disks exhibit strong alignment in the sky plane, suggesting bulge formation may be driven by material migration from outer disks. Although further simulations are needed, our results provide a novel alignment-based perspective on bulge formation, advancing understanding of galactic structural evolution.

astro-ph.GA↗