A KECK/LRIS SPATIALLY RESOLVED SPECTROSCOPIC STUDY OF A LINER GALAXY SDSS J091628.05+420818.7

Journal Article · Sun Jul 01 04:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/753/1/10· OSTI ID:22036959

Bae, Hyun-Jin; Yoon, Suk-Jin ^[1]; Woo, Jong-Hak ^[2]; Yagi, Masafumi ^[3]; Yoshida, Michitoshi ^[4]

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1. Department of Astronomy and Center for Galaxy Evolution Research, Yonsei University, Seoul 120-749 (Korea, Republic of)
2. Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of)
3. Optical and Infrared Astronomy Division, National Astronomical Observatory of Japan, Tokyo 181-8588 (Japan)
4. Hiroshima Astrophysical Science Center, Hiroshima University, Hiroshima 739-8526 (Japan)

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{sub 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.

• OSTI ID: 22036959
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 753; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ABSORPTION
ABSORPTION SPECTRA
ASTRONOMY
ASTROPHYSICS
EMISSION SPECTRA
GALAXIES
IONIZATION
NITROGEN IONS
OXYGEN IONS
PHOTON EMISSION
RESOLUTION
TELESCOPES
VISIBLE SPECTRA