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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 709829.0, MPI für Astronomie / Publikationen_mpia
Morphological parameters of a Spitzer Survey of stellar structure in Galaxies
Authors:Holwerda, B. W.; Muñoz-Mateos, J. -. C.; Comerón, S.; Meidt, S.; Sheth, K.; Laine, S.; Hinz, J. L.; Regan, M. W.; Gil de Paz, A.; Menéndez-Delmestre, K.; Seibert, M.; Kim, T.; Mizusawa, T.; Laurikainen, E.; Salo, H.; Laine, J.; Gadotti, D. A.; Zaritsky, D.; Erroz-Ferrer, S.; Ho, L. C.; Knapen, J. H.; Athanassoula, E.; Bosma, A.; Pirzkal, N.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astrophysical Journal
Volume:781
Issue / Number:1
Start Page:id. 12 (19 pp)
Audience:Not Specified
Abstract / Description:The morphology of galaxies can be quantified to some degree using a set of scale-invariant parameters. Concentration (C), asymmetry (A), smoothness (S), the Gini index (G), the relative contribution of the brightest pixels to the second-order moment of the flux (M 20), ellipticity (E), and the Gini index of the second-order moment (GM ) have all been applied to morphologically classify galaxies at various wavelengths. Here, we present a catalog of these parameters for the Spitzer Survey of stellar structure in Galaxies, a volume-limited, near-infrared (NIR) imaging survey of nearby galaxies using the 3.6 and 4.5 mum channels of the Infrared Array Camera on board the Spitzer Space Telescope. Our goal is to provide a reference catalog of NIR quantified morphology for high-redshift studies and galaxy evolution models with enough detail to resolve stellar mass morphology. We explore where normal, non-interacting galaxies---those typically found on the Hubble tuning fork---lie in this parameter space and show that there is a tight relation between concentration (C 82) and M 20 for normal galaxies. M 20 can be used to classify galaxies into earlier and later types (i.e., to separate spirals from irregulars). Several criteria using these parameters exist to select systems with a disturbed morphology, i.e., those that appear to be undergoing a tidal interaction. We examine the applicability of these criteria to Spitzer NIR imaging. We find that four relations, based on the parameters A and S, G and M 20, GM , C, and M 20, respectively, select outliers in morphological parameter space, but each selects different subsets of galaxies. Two criteria (GM > 0.6, G > -0.115 × M 20 + 0.384) seem most appropriate to identify possible mergers and the merger fraction in NIR surveys. We find no strong relation between lopsidedness and most of these morphological parameters, except for a weak dependence of lopsidedness on concentration and M 20.
Free Keywords:galaxies: elliptical and lenticular; cD; galaxies: general; galaxies: irregular; galaxies: spiral; galaxies: statistics; galaxies: stellar content; galaxies: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637X/781/1/12
URL:http://cdsads.u-strasbg.fr/abs/2014ApJ...781...12H
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