The jet formation mechanism of Gamma-ray Narrow-line Seyfert 1 Galaxies

TL;DR

This paper compares different theoretical models for jet power in gamma-ray Narrow-line Seyfert 1 galaxies, finding the hybrid model best explains most observed jet powers, with some exceptions possibly due to magnetic field effects.

Contribution

It evaluates the maximal jet power from various mechanisms and demonstrates the hybrid model's effectiveness in explaining gamma-ray NLS1 galaxies' jets.

Findings

Hybrid model explains most gamma-ray NLS1 jet powers.

Jet power depends on black hole spin in some models.

One source exceeds hybrid model predictions, suggesting additional acceleration mechanisms.

Abstract

Under the coronal magnetic field, we estimate the maximal jet power of the Blandford-\Znajek (BZ) mechanism, Blandford-\Payne (BP) mechanism, and hybrid model. The jet power of the BZ and Hybrid model mechanisms depends on the spin of a black hole, while the jet power of the BP mechanism does not depend on the spin of a black hole. At high black hole spin, the jet power of the hybrid model is greater than that of the BZ and BP mechanisms. We find that the jet power of almost all gamma-\ray narrow line Seyfert 1 galaxies (gamma-\NLS1s) can be explained by the hybrid model. However, one source with jet power 0.1~\1 Eddington luminosity can not be explained by the hybrid model. We suggest that the magnetic field dragged inward by the accretion disk with magnetization-\driven outflows may accelerate the jets in this gamma-\NLS1.