# Latest trends in the study of accretion and outflows around compact objects

## TL;DR

This paper reviews recent advances in understanding accretion flows and outflows around black holes and neutron stars, emphasizing the role of sub-Keplerian flows, oscillations, and feedback mechanisms in shaping observed spectra and outflow phenomena.

## Contribution

It introduces new insights into how sub-Keplerian flows and feedback influence accretion dynamics and emission properties near compact objects.

## Key findings

- Sub-Keplerian flows significantly affect emitted spectra.
- Oscillations depend on accretion rate and flow parameters.
- Feedback from outflows influences flow stability.

## Abstract

Study of astrophysics of black holes and neutron stars has taken a new turn in the present decade with the realization that sub-Keplerian flows and the associated centrifugal barrier near the horizon or the surface of a neutron star play a major role in deciding the nature of the emitted spectra and the formation of outflows from the accreting matter. This region may remain steady or oscillate depending on the accretion rate, specific angular momentum and specific energy of the flow. Intricacies of oscillation may depend on the degree of feedback the inflow receives from the outflow. This region may emit hard or soft X-rays depending on relative numbers of hot elections and soft photons intercepted by this region. We discuss how these properties come about and how they explain the observational results of black hole candidates.