dc.contributor.author | Kaviraj, S. | |
dc.date.accessioned | 2013-10-31T14:01:02Z | |
dc.date.available | 2013-10-31T14:01:02Z | |
dc.date.issued | 2010-07-01 | |
dc.identifier.citation | Kaviraj , S 2010 , ' Peculiar early-type galaxies in the Sloan Digital Sky Survey Stripe82 ' , Monthly Notices of the Royal Astronomical Society , vol. 406 , no. 1 , pp. 382-394 . https://doi.org/10.1111/j.1365-2966.2010.16714.x | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.other | ORCID: /0000-0002-5601-575X/work/77850199 | |
dc.identifier.uri | http://hdl.handle.net/2299/11948 | |
dc.description.abstract | We explore the properties of 'peculiar' early-type galaxies (ETGs) in the local Universe that show (faint) morphological signatures of recent interactions such as tidal tails, shells and dust lanes. Standard-depth (∼51-s exposure) multicolour galaxy images from the Sloan Digital Sky Survey (SDSS) are combined with the significantly (∼2 mag) deeper monochromatic images from the public SDSS Stripe82 to extract, through careful visual inspection, a robust sample of nearby (z <0.05), luminous (M <-20.5) ETGs, including a subset of ∼70 peculiar systems. ∼18 per cent of ETGs exhibit signs of disturbed morphologies (e.g. shells), while ∼7 per cent show evidence of dust lanes and patches. An analysis of optical emission-line ratios indicates that the fraction of peculiar ETGs that are Seyferts or LINERs (19.4 per cent) is twice the corresponding values in their relaxed counterparts (10.1 per cent). LINER-like emission is the dominant type of nebular activity in all ETG classes, plausibly driven by stellar photoionization associated with recent star formation. An analysis of ultraviolet-optical colours indicates that, regardless of the luminosity range being considered, the fraction of peculiar ETGs that have experienced star formation in the last Gyr is a factor of ∼1.5 higher than that in their relaxed counterparts. The spectrophotometric results strongly suggest that the interactions that produce the morphological peculiarities also induce low-level recent star formation which, based on the recent literature, are likely to contribute a few per cent of the stellar mass over the last ∼1 Gyr. Peculiar ETGs preferentially inhabit low-density environments (outskirts of clusters, groups or the field), either due to high peculiar velocities in clusters making merging unlikely or because shell systems are disrupted through frequent interactions within a cluster crossing time. The catalogue of galaxies that forms the basis of this paper can be obtained at http://www.mssl.ucl.ac.uk/~ska/stripe82/skavirajstripe82.dat or on request from the author. | en |
dc.format.extent | 13 | |
dc.format.extent | 2275228 | |
dc.language.iso | eng | |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | |
dc.title | Peculiar early-type galaxies in the Sloan Digital Sky Survey Stripe82 | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Centre of Data Innovation Research | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=77955133140&partnerID=8YFLogxK | |
rioxxterms.versionofrecord | 10.1111/j.1365-2966.2010.16714.x | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |