Exploring the physics of the accretion and jet in nearby narrow-line Seyfert 1 galaxies

Abstract

In this paper, we explore the physics of the accretion and jet in narrow-line Seyfert 1 galaxies (NLS1). Specifically, we compile a sample composed of 16 nearby NLS1 with $L_{\mathrm{bol}}/L_{\mathrm{Edd}}\gtrsim 0.1$. We investigate the mutual correlation between their radio luminosity $L_{\mathrm{R}}$, X-ray luminosity $L_{\mathrm{X}}$, optical luminosity $L_{5100}$ and black hole mass $M_{\mathrm{BH}}$. By adopting partial correlation analysis: (1) we find a positive correlation between $L_{\mathrm{X}}$ and $M_{\mathrm{BH}}$, and (2) we find a weak positive correlation between $L_{\mathrm{R}}$ and $L_{5100}$. However, we don't find significant correlations between $L_{\mathrm{R}}$ and $L_{\mathrm{X}}$ or between $L_{\mathrm{X}}$ and $L_{5100}$ after considering the effect of the black hole mass, which leads to a finding of the independence of $L_{\mathrm{X}}/L_{\mathrm{Edd}}$ on $L_{5100}/L_{\mathrm{Edd}}$. Interestingly, the findings that $L_{\mathrm{X}}$ is correlated with $M_{\mathrm{BH}}$ and $L_{\mathrm{X}}/L_{\mathrm{Edd}}$ is not correlated with $L_{5100}/L_{\mathrm{Edd}}$ support that the X-ray emission is saturated with increasing $\dot{M}$ for $L_{\mathrm{bol}}/L_{\mathrm{Edd}}\gtrsim 0.1$ in NLS1s, which may be understood in the framework of slim disc scenario. Finally, we suggest that a larger NLS1 sample with high quality radio and X-ray data is needed to further confirm this result in the future.

9 pages, accepted for publication in MNRAS