Telling Liers From Liners: The Nature Of The Nebular Emission Of Early-type Galaxies

Details Telling Liers From Liners: The Nature Of The Nebular Emission Of Early-type Galaxies Telling Liers From Liners: The Nature Of The Nebular Emission Of Early-type Galaxies

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21742203s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #422.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

Mathematics

Logic

Scientific paper

It is now well documented that early-type galaxies (ETGs) are not just passive stellar systems since they often exhibit a relatively weak degree of nebular activity. Such ionized-gas emission is generally characterized by the presence of low-ionization lines, as found in low-ionization nuclear emission-line regions or LINERs.
Recent SAURON integral-field spectroscopic (IFS) observations have shown that the nebular activity of ETGs is always extended and thus requires another source of ionization than a central AGN, most likely old UV-bright stars. In fact, the nuclear LINER emission of ETGs very rarely dominates the integrated nebular spectrum of these systems. This means that in large-scale surveys such as the Sloan Digital Sky Survey (SDSS) where the spectra encompass most of the light from the target galaxies, the LINER-like emission observed in distant ETGs is actually dominated by extended low-ionization emission regions, or LIERs. Such LIERs can have only modest values for the equivalent width of strong emission lines such as [OIII]5007, whereas only AGNs can power the strongest [OIII] emission of true LINERs.
This finding provides an excellent opportunity to further study the nature of such an extended emission, and in particular its source of ionization. The SDSS data offer indeed a much larger array of emission lines that the SAURON IFS data, if a sufficient number of spectra is stacked to bring out the signal of the weak low-ionisation lines.
Using a complete catalogue of SDSS DR7 spectra of morphologically selected ETGs we will present and examine the salient features of the best spectral templates for both the central LINER and extended LIER emission of ETGs.

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