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Morphological parameters of a spitzer survey of stellar structure in galaxies

Comerón S.; Laine S.; Gadotti D.; Regan M.; Sheth K.; Muñoz-Mateos J.; Laurikainen E.; Laine J.; Menéndez-Delmestre K.; Knapen J.; Seibert M.; Ho L.; Bosma A.; Zaritsky D.; Kim T.; Athanassoula E.; Mizusawa T.; Pirzkal N.; Erroz-Ferrer S.; Salo H.; Holwerda B.; Hinz J.; Meidt S.; Gil De Paz A.

Morphological parameters of a spitzer survey of stellar structure in galaxies

Comerón S.
Laine S.
Gadotti D.
Regan M.
Sheth K.
Muñoz-Mateos J.
Laurikainen E.
Laine J.
Menéndez-Delmestre K.
Knapen J.
Seibert M.
Ho L.
Bosma A.
Zaritsky D.
Kim T.
Athanassoula E.
Mizusawa T.
Pirzkal N.
Erroz-Ferrer S.
Salo H.
Holwerda B.
Hinz J.
Meidt S.
Gil De Paz A.
Katso/Avaa
pre-print (9.680Mb)
Lataukset: 

Institute of Physics Publishing
doi:10.1088/0004-637X/781/1/12
URI
http://api.elsevier.com/content/abstract/scopus_id:84891856453
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042715344
Tiivistelmä


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), ellipticity (E), and the Gini index of the second-order moment (G) 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 μm 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) and M for normal galaxies. M 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, G, C, and M, respectively, select outliers in morphological parameter space, but each selects different subsets of galaxies. Two criteria (G > 0.6, G >-0.115 × M + 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. © 2014. The American Astronomical Society. All rights reserved.

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