# The effect of cooling on time dependent behaviour of accretion flows around black holes

Source: [The effect of cooling on time dependent behaviour of accretion flows around black holes](<https://www.sota2.com/research/paper/68fa265e2c2a3760193b9620>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T11:19:58.116Z

Authors: Sandip K. Chakrabarti, K. Acharyya, D. Molteni

Published: 2004-02-24T12:55:37.000Z

## Abstract

We present the results of several numerical simulations of two dimensional axi-symmetric accretion flows around black holes using Smoothed Particle Hydrodynamics (SPH) in the presence of cooling effects. We consider both stellar black holes and super-massive black holes. We observe that due to {\\it both radial and vertical oscillation} of shock waves in the accretion flow, the luminosity and average thermal energy content of the inner disk exhibit very interesting behaviour. When power density spectra are taken, quasi-periodic variabilities are seen at a few Hz and also occasionally at hundreds of Hz for stellar black holes. For super-massive black holes, the time scale of the oscillations ranges from hours to weeks. The power density spectra have a flat top behavior with average {\\it rms} amplitude of a few percent and a broken power-law behavior. The break frequency is generally found to be close to the frequency where the shock oscillates.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/astro-ph/0402557>)

[PDF](<https://arxiv.org/pdf/astro-ph/0402557.pdf>)