# The intrinsic Baldwin effect in broad Balmer lines of six long-term monitored AGNs

## TL;DR

This study confirms the presence of the intrinsic Baldwin effect in broad Balmer lines across six diverse AGNs, showing it is independent of AGN type and possibly linked to additional optical continuum components.

## Contribution

It provides the first comprehensive analysis of the intrinsic Baldwin effect across different AGN types, revealing its universality and potential causes.

## Key findings

- Intrinsic Beff is present in all sampled AGNs.
- No significant difference in Beff slopes across AGN types.
- Intrinsic Beff is not correlated with the global Baldwin effect.

## Abstract

We investigate the intrinsic Baldwin effect (Beff) of the broad H$\alpha$ and H$\beta$ emission lines for six Type 1 active galactic nuclei (AGNs) with different broad line characteristics: two Seyfert 1 (NGC 4151 and NGC 5548), two AGNs with double-peaked broad line profiles (3C 390.3 and Arp 102B), one narrow line Seyfert 1 (Ark 564), and one high-luminosity quasar with highly red asymmetric broad line profiles (E1821+643). We found that a significant intrinsic Beff was present in all Type 1 AGNs in our sample. Moreover, we do not see strong difference in intrinsic Beff slopes in different types of AGNs which probably have different physical properties, such as inclination, broad line region geometry, or accretion rate. Additionally, we found that the intrinsic Beff was not connected with the global one, which, instead, could not be detected in the broad H$\alpha$ or H$\beta$ emission lines. In the case of NGC 4151, the detected variation of the Beff slope could be due to the change in the site of line formation in the BLR. Finally, the intrinsic Beff might be caused by the additional optical continuum component that is not part of the ionization continuum.