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dc.contributor.authorGanda, K.
dc.contributor.authorPeletier, R.F.
dc.contributor.authorMcDermid, R.M.
dc.contributor.authorFalcon-Barroso, J.
dc.contributor.authorde Zeeuw, P.T.
dc.contributor.authorBacon, R.
dc.contributor.authorCappellari, M.
dc.contributor.authorDavies, R.L.
dc.contributor.authorEmsellem, E.
dc.contributor.authorKrajnovic, D.
dc.contributor.authorKuntschner, H.
dc.contributor.authorSarzi, M.
dc.contributor.authorvan de Ven, G.
dc.date.accessioned2008-02-05T12:24:28Z
dc.date.available2008-02-05T12:24:28Z
dc.date.issued2007
dc.identifier.citationGanda , K , Peletier , R F , McDermid , R M , Falcon-Barroso , J , de Zeeuw , P T , Bacon , R , Cappellari , M , Davies , R L , Emsellem , E , Krajnovic , D , Kuntschner , H , Sarzi , M & van de Ven , G 2007 , ' Absorption-line strengths of 18 late-type spiral galaxies observed with SAURON ' , Monthly Notices of the Royal Astronomical Society , vol. 380 , no. 2 , pp. 506-540 . https://doi.org/10.1111/j.1365-2966.2007.12121.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 148703
dc.identifier.otherPURE UUID: debc891f-0ffd-47c1-abe9-5715d8fe04d2
dc.identifier.otherdspace: 2299/1574
dc.identifier.otherScopus: 34548438607
dc.identifier.urihttp://hdl.handle.net/2299/1574
dc.descriptionThe definitive version is available at www.blackwell-synergy.com. Copyright Blackwell Publishing DOI : 10.1111/j.1365-2966.2007.12121.x
dc.description.abstractWe present absorption line-strength maps for a sample of 18 Sb-Sd galaxies observed using the integral-field spectrograph SAURON operating at the William Herschel Telescope on La Palma, as part of a project devoted to the investigation of the kinematics and stellar populations of late-type spirals, a relatively unexplored field. The SAURON spectral range allows the measurement of the Lick/IDS indices Hβ, Fe5015 and Mgb, which can be used to estimate the stellar population parameters.We present here the two-dimensional line-strength maps for each galaxy. From the maps, we learn that late-type spiral galaxies tend to have high Hβ and low Fe5015 andMgb values, and that the Hβ index has often a positive gradient over the field, while the metal indices peak in the central region. We investigate the relations between the central line-strength indices and their correlations with morphological type and central velocity dispersion, and compare the observed behaviour with that for ellipticals, lenticulars and early-type spirals from the SAURON survey. We find that our galaxies lie below the Mg - σ relation determined for elliptical galaxies and that the indices show a clear trend with morphological type. From the line-strength maps we calculate age, metallicity and abundance ratio maps via a comparison with model predictions; we discuss the results from a one-SSP (Single Stellar Population) approach and from a two-SSP approach, considering the galaxy as a superposition of an old ( 13 Gyr) and a younger (age 6 5 Gyr) population.We confirm that late-type galaxies are generally younger and more metal poor than ellipticals and have abundance ratios closer to solar values. We also explore a continuous star formation scenario, and try to recover the star formation history using the evolutionarymodels of Bruzual & Charlot (2003), assuming constant or exponentially declining star formation rate (SFR). In this last case, fixing the galaxy age to 10 Gyr, we find a correlation between the e-folding time-scale τ of the starburst and the central velocity dispersion, in the sense that more massive galaxies tend to have shorter τ, suggesting that the star formation happened long ago and has now basically ended, while for smaller objects with larger values of τ it is still active now.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.titleAbsorption-line strengths of 18 late-type spiral galaxies observed with SAURONen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2007.12121.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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