English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We explore the properties of `peculiar' early-type galaxies (ETGs) in thelocal Universe, that show (faint) morphological signatures of recentinteractions such as tidal tails, shells and dust lanes. Standard-depth (51sexposure) multi-colour galaxy images from the Sloan Digital Sky Survey (SDSS)are combined with the significantly (2 mags) deeper monochromatic images fromthe public SDSS Stripe82 to extract, through careful visual inspection, arobust sample of nearby, luminous ETGs, including a subset of ~70 peculiarsystems. 18% of ETGs exhibit signs of disturbed morphologies (e.g. shells),while 7% show evidence of dust lanes and patches. The peculiar ETG populationis found to preferentially inhabit low-density environments (outskirts ofclusters, groups or the field). An analysis of optical emission-line ratiosindicates that the fraction of peculiar ETGs that are Seyferts or LINERs(19.4%) is twice the corresponding values in their relaxed counterparts(10.1%). LINER-like emission is the dominant type of nebular activity in allETG classes, plausibly driven by stellar photoionisation associated with recentstar formation. An analysis of UV-optical colours indicates that, regardless ofthe luminosity range being considered, the fraction of peculiar ETGs that haveexperienced star formation in the last Gyr is a factor of ~1.5 higher than thatin their relaxed counterparts. The spectro-photometric results strongly suggestthat the interactions that produce the morphological peculiarities also inducelow-level recent star formation which, based on the recent literature, arelikely to contribute a few percent of the stellar mass over the last 1 Gyr. Thecatalogue of galaxies that forms the basis of this paper can be obtained at:http://www.mssl.ucl.ac.uk/~ska/stripe82/skaviraj_stripe82.dat or on requestfrom the author.

Peculiar early‐type galaxies in the Sloan Digital Sky Survey Stripe82