2026-03-11T20:05:41Z https://hiroshima.repo.nii.ac.jp/oai

oai:hiroshima.repo.nii.ac.jp:02006341 2025-02-21T07:21:37Z 1730444907710

A Keck/LRIS Spatially-Resolved Spectroscopic Study of a LINER Galaxy SDSS J091628.05+420818.7 Bae, Hyun-Jin Woo, Jong-Hak Yagi, Masafumi Yoon, Suk-Jin Yoshida, Michitoshi galaxies: active galaxies: kinematics and dynamics 440 Using spatially resolved spectra obtained with the Low Resolution Imaging Spectrometer at the Keck I telescope, we investigate the nature of ionizing sources and kinematic properties of emission-line gas in a LINER galaxy SDSS J091628.05+420818.7, which is a nearby (z = 0.0241) and bright (M-r = -20.2) early-type galaxy. After subtracting stellar absorption features using a combination of simple stellar population models, we measure the flux, line-of-sight velocity, and velocity dispersion of four emission lines, i.e., H alpha, H beta, [O III] lambda 5007, and [N II] lambda 6584, to study radial change of emission-line fluxes and velocities. Compared to the point-spread function of the observation, the emission-line region is slightly extended but comparable to the seeing size. The central concentration of emission-line gas suggests that ionization is triggered by a nuclear source, excluding old stellar population as ionizing sources. We find that emission-line gas is counter-rotating with respect to stellar component and that the [O III] lambda 5007 line is blueshifted compared to other emission lines, possibly due to an outflow. http://purl.org/coar/resource_type/c_6501 IOP Publishing Ltd 2012 VoR 0004-637X AA00553242 10 Astrophysical Journal 1 753 10 Astrophysical Journal https://hiroshima.repo.nii.ac.jp/records/2006341 eng 10.1088/0004-637X/753/1/10 http://dx.doi.org/10.1088/0004-637X/753/1/10 open access (c) 2012. The American Astronomical Society. All rights reserved. Printed in the U.S.A.