Abstract
We study the spatially resolved excitation properties of the ionised gas in a sample of 646 galaxies using integral field spectroscopy data from SDSS-IV MaNGA. Making use of Baldwin-Philips-Terlevich diagnostic diagrams we demonstrate the ubiquitous presence of extended (kpc scale) low ionisation emission-line regions (LIERs) in both star forming and quiescent galaxies. In star forming galaxies LIER emission can be associated with diffuse ionised gas, most evident as extra-planar emission in edge-on systems. In addition, we identify two main classes of galaxies displaying LIER emission: `central LIER' (cLIER) galaxies, where central LIER emission is spatially extended, but accompanied by star formation at larger galactocentric distances, and `extended LIER' (eLIER) galaxies, where LIER emission is extended throughout the whole galaxy. In eLIER and cLIER galaxies, LIER emission is associated with radially flat, low H$\alpha$ equivalent width of line emission ($
Original language | English |
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Pages (from-to) | 3111-3134 |
Number of pages | 26 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 461 |
Issue number | 3 |
Early online date | 23 May 2016 |
DOIs | |
Publication status | Published - 21 Sep 2016 |
Keywords
- astro-ph.GA
- surveys
- galaxies: evolution
- galaxies: fundamental parameters
- galaxies: ISM
- RCUK
- STFC