Tootfinder

A gravitational acceleration model to explain the double-peaked narrow emission lines shifted in the same direction
XingQian Chen, GuiLin Liao, Qi Zheng, XueGuang Zhang
https://arxiv.org/abs/2507.04320

A gravitational acceleration model to explain the double-peaked narrow emission lines shifted in the same direction
In this manuscript, we propose, for the first time, an oversimplified but potentially effective gravitational acceleration model to interpret the double-peaked narrow emission lines (DPNELs) shifted in the same direction. We adopt the framework of a merging kpc-scale dual-core system in an elliptical orbit, which has an emission-line galaxy with clear narrow line regions (NLRs) merging with a companion galaxy lacking emission line features. Due to gravitational forces induced by both galaxies o…

No apparent forbidden/permitted narrow emission lines in the broad line quasar SDSS J1251 0613
Zhang XueGuang (GXU)
https://arxiv.org/abs/2506.18400 https:…

No apparent forbidden/permitted narrow emission lines in the broad line quasar SDSS J1251+0613
Strong both broad and narrow emission lines from central broad emission line regions (BLRs) and narrow emission line regions (NLRs) are fundamental spectroscopic characteristics of broad line Active Galactic Nuclei (BLAGNs). Lack of central BLRs leads to the identified true Type-2 AGNs without central hidden BLRs, providing clues on formation/suppression of AGN BLRs. Whether were there BLAGNs with lack of central NLRs is still an open question. Here, in the blue quasar SDSS J1251+0613, both blu…