Optical spectroscopy of type-2 LINERs
Abstract
Low-Ionisation Nuclear Emission-line Regions (LINERs) are the least luminous and the most numerous among the local population of Active Galactic Nuclei (AGN). They can be classified as type-1 or type-2 if their optical spectra show or do not show, respectively, a broad component. It is associated with the presence of a Broad Line Region (BLR) in these systems. However, recent studies have proven that the classification of type-1 LINERs may be controversial, since space- and ground-based spectroscopy provide contradicting results on the presence of very broad components (Cazzoli et al. <xref rid="r4" ref-type="bibr">2018</xref>). We have studied the nuclear spectra of 9 type-2 LINERs with intermediate spectral resolution HST/STIS data. We present the results on our analysis of the different spectral components, and discuss the eventual presence of BLR components in type-2 LINER galaxies, together with the possible presence of outflows, both in comparison with type-1 LINERs. We have found a BLR component in 7 out of the 9 analysed objects within the HST/STIS data.
- Publication:
-
Nuclear Activity in Galaxies Across Cosmic Time
- Pub Date:
- January 2021
- DOI:
- Bibcode:
- 2021IAUS..356..317H
- Keywords:
-
- galaxies: active;
- galaxies: nuclei;
- galaxies: kinematics and dynamics;
- techniques: spectroscopic