Show simple item record

dc.contributor.authorCrockett, R.M.
dc.contributor.authorKaviraj, S.
dc.contributor.authorSilk, J.I.
dc.contributor.authorWhitmore, B.C.
dc.contributor.authorMutchler, M.
dc.contributor.authorBond, H.E.
dc.contributor.authorO'Connell, R.W.
dc.contributor.authorBalick, B.
dc.contributor.authorCalzetti, D.
dc.contributor.authorCarollo, C.M.
dc.contributor.authorDisney, M.J.
dc.contributor.authorDopita, M.A.
dc.contributor.authorFrogel, J.A.
dc.contributor.authorHall, D.N.B.
dc.contributor.authorHoltzman, J. A.
dc.contributor.authorKimble, R.A.
dc.contributor.authorMcCarthy, P.J.
dc.contributor.authorParesce, F.
dc.contributor.authorSaha, A.
dc.contributor.authorTrauger, J.T.
dc.contributor.authorWalker, A.R.
dc.contributor.authorWindhorst, R.A.
dc.contributor.authorYoung, E.T.
dc.contributor.authorJeong, H.
dc.contributor.authorYi, S.K.
dc.date.accessioned2013-10-30T10:31:04Z
dc.date.available2013-10-30T10:31:04Z
dc.date.issued2011-02-01
dc.identifier.citationCrockett , R M , Kaviraj , S , Silk , J I , Whitmore , B C , Mutchler , M , Bond , H E , O'Connell , R W , Balick , B , Calzetti , D , Carollo , C M , Disney , M J , Dopita , M A , Frogel , J A , Hall , D N B , Holtzman , J A , Kimble , R A , McCarthy , P J , Paresce , F , Saha , A , Trauger , J T , Walker , A R , Windhorst , R A , Young , E T , Jeong , H & Yi , S K 2011 , ' Anatomy of a post-starburst minor merger : A multi-wavelength WFC3 study of NGC 4150 ' , Astrophysical Journal Letters , vol. 727 , no. 2 , 115 . https://doi.org/10.1088/0004-637X/727/2/115
dc.identifier.issn2041-8205
dc.identifier.otherPURE: 2066135
dc.identifier.otherPURE UUID: 7d9fd91f-5c34-487b-ba44-37df1953cfb1
dc.identifier.otherScopus: 84891226456
dc.identifier.otherORCID: /0000-0002-5601-575X/work/77850224
dc.identifier.urihttp://hdl.handle.net/2299/11914
dc.description.abstractWe present a spatially resolved near-UV/optical study, using the Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope, of NGC 4150, a sub-L , early-type galaxy (ETG) of around 6 × 10 M , which has been observed as part of the WFC3 Early-Release Science Programme. Previous work indicates that this galaxy has a large reservoir of molecular hydrogen gas, exhibits a kinematically decoupled core (a likely indication of recent merging) and strong, central Hβ absorption (indicative of young stars). While relatively uninspiring in its optical image, the core of NGC 4150 shows ubiquitous near-UV emission and remarkable dusty substructure. Our analysis shows this galaxy to lie in the near-UV green valley, and its pixel-by-pixel photometry exhibits a narrow range of near-UV/optical colors that are similar to those of nearby E+A (post-starburst) galaxies and lie between those of M83 (an actively star-forming spiral) and the local quiescent ETG population. We parameterize the properties of the recent star formation (RSF; age, mass fraction, metallicity, and internal dust content) in the NGC 4150 pixels by comparing the observed near-UV/optical photometry to stellar models. The typical age of the RSF is around 0.9 Gyr, consistent with the similarity of the near-UV colors to post-starburst systems, while the morphological structure of the young component supports the proposed merger scenario. The typical RSF metallicity, representative of the metallicity of the gas fuelling star formation, is ∼0.3-0.5 Z . Assuming that this galaxy is a merger and that the gas is sourced mainly from the infalling companion, these metallicities plausibly indicate the gas-phase metallicity (GPM) of the accreted satellite. Comparison to the local mass-GPM relation suggests (crudely) that the mass of the accreted system is ∼3 × 10 M , making NGC 4150 a 1:20 minor merger. A summation of the pixel RSF mass fractions indicates that the RSF contributes ∼2%-3% of the stellar mass. This work reaffirms our hypothesis that minor mergers play a significant role in the evolution of ETGs at late epochs.en
dc.format.extent13
dc.language.isoeng
dc.relation.ispartofAstrophysical Journal Letters
dc.titleAnatomy of a post-starburst minor merger : A multi-wavelength WFC3 study of NGC 4150en
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=79960233362&partnerID=8YFLogxK
rioxxterms.versionSMUR
rioxxterms.versionofrecordhttps://doi.org/10.1088/0004-637X/727/2/115
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record