SDSS J083253.18+064316.7: one strange object with double-peaked narrow H\alpha but single-peaked narrow H\beta

TL;DR

This paper reports a unique astronomical object with unusual narrow emission line profiles, providing evidence supporting a non-kinematic model based on radiative transfer effects rather than traditional kinematic explanations.

Contribution

The study presents the first observation of an object with double-peaked narrow Hα but single-peaked narrow Hβ, supporting the non-kinematic radiative transfer model for emission line profiles.

Findings

SDSS J0832+0643 exhibits double-peaked Hα and single-peaked Hβ lines.

The features are explained by optical depth differences, not kinematic effects.

Supports non-kinematic radiative transfer model for emission lines.

Abstract

In this letter, we firstly report one unique object SDSS J0832+0643 with particular features of narrow balmer emission lines: double-peaked narrow H\alpha but single-peaked narrow H\beta. The particular features can not be expected by currently proposed kinematic models for double-peaked narrow emission lines, because the proposed kinematic models lead to similar line profiles of narrow balmer emission lines. However, due to radiative transfer effects, the non-kinematic model can be naturally applied to well explain the particular features of narrow balmer emission lines: larger optical depth in H\alpha than 10 leads to observed double-peaked narrow H\alpha, but smaller optical depth in H\beta around 2 leads to observed single-peaked narrow H\beta. Therefore, SDSS J0832+0643 can be used as strong evidence to support the non-kinematic model for double-peaked narrow emission lines.