Two Physically Distinct Populations of Low-Ionization Nuclear Emission-Line Regions
arXiv:0902.1023 · doi:10.1088/0004-637X/693/2/L66
Abstract
The nature of Low-ionization Nuclear Emission-line Regions (LINERs) has been an open question for a long time. We study the properties of LINERs from several different aspects. The LINERs are found to consist of two different categories that can be clearly separated in the traditional BPT diagrams, especially in the [OI]/Ha vs. [OIII]/Hb diagram. LINERs with high [O]/Ha ratios (population I) differ from ones with low ratios (population II) in several properties. Broad emission lines are only identified in the spectra of population I LINERs. While only the population II LINERs show luminous infrared emission and occurrence of core-collapse supernovae in the host. Combining these results with the known distribution of stellar populations not only suggests that the two populations have different line excitation mechanisms, but also implies that they are at different evolutionary stages.
12 pages, 2 figures, accepted by ApJ Letter
References in corpus (40)
- The Host Galaxies of AGN
- Theoretical Modeling of Starburst Galaxies
- The Host Galaxies and Classification of Active Galactic Nuclei
- Advection-Dominated Accretion: Underfed Black Holes and Neutron Stars
- Nuclear Activity in Nearby Galaxies
- A Physical Model for the Co-evolution of QSOs and of their Spheroidal Hosts
- Thermal Equilibria of Accretion Disks
- Black Holes in Galaxy Mergers: Evolution of Quasars
- The AGN Obscuring Torus -- End of the "Doughnut" Paradigm?
- A Close Look at Star Formation around Active Galactic Nuclei
- A Search for "Dwarf" Seyfert Nuclei. IV. Nuclei with Broad H-alpha Emission
- Optical Spectroscopy of the IRAS 1-Jy Sample of Ultraluminous Infrared Galaxies
- Chandra Snapshot Observations of Low-Luminosity AGNs with a Compact Radio Source
- Can retired galaxies mimic active galaxies? Clues from the Sloan Digital Sky Survey
- The IRAS 1-Jy Survey of Ultraluminous Infrared Galaxies: I. The sample and Luminosity Function
- Characterizing Supernova Progenitors via the Metallicities of their Host Galaxies, from Poor Dwarfs to Rich Spirals
- The Murmur of the Sleeping Black Hole: Detection of Nuclear Ultraviolet Variability in LINER Galaxies
- Obscuring Material around Seyfert Nuclei with Starbursts
- A Search for "Dwarf" Seyfert Nuclei. VI. Properties of Emission-Line Nuclei in Nearby Galaxies
- A spectroscopic atlas of post-AGB stars and planetary nebulae selected from the IRAS Point Source Catalogue
- The Ultraviolet Spectra of LINERs: A Comparative Study
- The Lack of BLR in Low Accretion Rate AGN as Evidence of their Origin in the Accretion Disk
- On The Nature of Low Luminosity Narrow Line AGN
- Stellar Population in LLAGN.I: Ground-based observations
- Three LINERs Under the Chandra X-Ray Microscope
- Stellar Population in LLAGN.II: STIS observations
- Mid-Infrared Diagnostics of LINERs
- The Stellar Populations in the Central Parsecs of Galactic Bulges Central Stellar Populations
- The Central Engines of 19 LINERs as Viewed by Chandra
- LINER/H II "Transition" Nuclei and the Nature of NGC 4569
- Proto-Quasars:Physical States and Observable Properties
- ASCA Observations of "Type 2" LINERs: Evidence for a Stellar Source of Ionization
- HST Observations and Photoionization Modeling of the LINER Galaxy NGC 1052
- Understanding AGN-Host Connection in Partially Obscured Active Galactic Nuclei. Part I: The Nature of AGN+HII Composites
- IR Mergers and IR QSOs with Galactic Winds. II. NGC 5514, two Extra-nuclear Starburts/LINERs with a Supergiant Bubble in the Rupture Phase
- Emission and Absorption in the M87 LINER
- Emission-Line Diagnostics of the Central Engines of Weak-Line Radio Galaxies
- A Catalog of Luminous Infrared Galaxies in the IRAS Survey and the Second Data Release of the SDSS
- An X-ray view of WLRGs/LINERs
- The polyhedral nature of LINERs: An XMM-Newton view of LINERs in radio galaxies