Radiative energy from a reconnection region around massive black hole

TL;DR

This study models the radiative energy and spectrum from magnetic reconnection regions around Sgr A*, revealing two distinct peaks in radio and NIR emissions due to blob formation and non-thermal electron production.

Contribution

It introduces a detailed calculation of emission spectra from magnetic reconnection in black hole environments, highlighting the origin of observed flare peaks.

Findings

Two peaks in radio and NIR light curves linked to reconnection events.

Luminosities exceeding 10^26 erg/s in radio and 10^28 erg/s in NIR.

Flares are caused by multiple reconnection phenomena, not a single event.

Abstract

In the previous numerical study, we find the blob formation and ejection in the presence of magnetic reconnection in the environment of the hot flow of the accretion disk. Based on those encouraging results, in the present work, we calculate the energy and the spectrum of the emission in the different bands around Sgr A*. We assume the electrons in the magnetic reconnection region are non-thermal and emits synchrotron radiation. The electrons in the other region are thermal, which follows the thermal distribution, and the thermal electron emission mechanism is thermal synchrotron radiation. During the whole process of the magnetic evolution and reconnection, we find two peaks in the temporal light curve in the recently observed Radio frequencies (230 GHz and 43 GHz) and NIR wavelengths. Although, the light curve of the NIR band is most prominent in a single peak. The first peak appears because of the blob in the plasma flow, which is formed due to the magnetic reconnection. The second peak appears due to the production of the non-thermal electrons with the evolution of the magnetic flux. Both peaks reach luminosity more than 1026 erg/s for a single plasmoid/blob. For the NIR band, the highest luminosity can reach more than 1028 erg/s. These luminosities can be high for the large simulation area and the stronger magnetic field with the multiple blobs. We infer that the observed flares are a group of magnetic reconnection phenomena, not a single one.