{"id":167877,"date":"2025-08-23T01:01:08","date_gmt":"2025-08-23T01:01:08","guid":{"rendered":"https:\/\/www.europesays.com\/us\/167877\/"},"modified":"2025-08-23T01:01:08","modified_gmt":"2025-08-23T01:01:08","slug":"self-consistent-model-incorporates-gas-self-gravity-effects-to-address-accretion-across-cosmic-scales","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/us\/167877\/","title":{"rendered":"Self-consistent model incorporates gas self-gravity effects to address accretion across cosmic scales"},"content":{"rendered":"

\"Scientists<\/p>\n

Global solutions of the TPBVP for ~\u03b2=0.65 and \u03b3=4\/3. Credit: The Astrophysical Journal (2025). DOI: 10.3847\/1538-4357\/adec71<\/p>\n

A research team led by Prof. Jiao Chengliang at the Yunnan Observatories of the Chinese Academy of Sciences, along with collaborators, has introduced a self-consistent model that addresses long-unresolved theoretical gaps in the study of self-gravitating spherical accretion. The study<\/a> was recently published in The Astrophysical Journal.<\/p>\n

Accretion, the fundamental astrophysical process by which matter is drawn onto a central celestial object (such as a black hole or star), underpins our understanding of phenomena ranging from star formation<\/a> to black hole growth. For decades, the classical Bondi model\u2014developed in the 1950s and still widely used today\u2014has served as the backbone of accretion<\/a> research.<\/p>\n

However, this foundational framework overlooks a critical factor: the self-gravity of the gas being accreted. This omission, the researchers note, can drastically alter flow structures and accretion rates in high-density astrophysical environments, limiting the model’s accuracy in key scenarios.<\/p>\n

To address this challenge, the team developed a comprehensive mathematical framework: a three-point boundary value problem tailored to spherically symmetric accretion that fully incorporates the self-gravity of the accreted gas.<\/p>\n

The researchers used a relaxation method, a numerical technique ideal for refining solutions to nonlinear systems, and derived simplified analytical formulas, enabling astronomers to quickly estimate the impact of self-gravity without intensive computational work.<\/p>\n

At the core of the new model is a dimensionless parameter, denoted as \u03b2, which quantifies self-gravity effects based on four measurable properties of the surrounding medium: density, sound speed, outer radius, and adiabatic index (a measure of how a gas responds to temperature and pressure changes).<\/p>\n

These findings reveal key insights into how self-gravity shapes accretion:<\/p>\n