Research Note

Emission lines properties of the radio-loud quasar LAMOST J1131+3114

¹ National Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences, 100190 Beijing, PR China
² Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, 100012 Beijing, PR China
e-mail: lal@lamost.org, lal@nao.cas.cn
³ University of Chinese Academy of Sciences, 100049 Beijing, PR China
⁴ Aix-Marseille Université, CNRS, Institut Pythéas, L.A.M., UMR 7326, 13388 Marseille Cedex, France
⁵ Physics and Space Science Department, Florida Institute of Technology, Melbourne FL 32901, USA

Received: 20 April 2013
Accepted: 24 February 2014

Abstract

The radio-loud quasar LAMOST J1131+3114 (Ton 580, B2 1128+315), showing asymmetrical profile in Hβ and [O III] lines, has been selected from the LAMOST Pilot Survey for further study. We present an analysis of its emission lines by means of multiple Gaussian fitting, performed on LAMOST, Apache Point Observatory, and archival spectra. The broad line region, with an Hβ line of FWHM ~ 4000 km s^-1 has been fit with a double Gaussian, one of which is very broad and redshifted from the reference frame. The object is a likely Population B quasar. The [O III] λλ4959,5007 lines profiles of the source have been formally fit with two Gaussian components, one of which is as broad as ~700 km s^-1. This broader component, if physically meaningful, appears to be subject to moderate velocity shock excitation. The forbidden line ratios correspond to a poorly populated area in standard diagnostic diagrams of AGN narrow line regions.