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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 720009.0, MPI für Astronomie / Publikationen_mpia
The Spitzer Survey of Stellar Structure in Galaxies (S4G): Multi-component decomposition strategies and data release
Authors:Salo, H.; Laurikainen, E.; Laine, J.; Comerón, S.; Gadotti, D. A.; Buta, R.; Sheth, K.; Zaritsky, D.; Ho, L.; Knapen, J.; Athanassoula, E.; Bosma, A.; Laine, S.; Cisternas, M.; Kim, T.; Muñoz-Mateos, J. C.; Regan, M.; Hinz, J. L.; Gil de Paz, A.; Menendez-Delmestre, K.; Mizusawa, T.; Erroz-Ferrer, S.; Meidt, S. E.; Querejeta, M.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:The Astrophysical Journal Supplement Series
Volume:219
Issue / Number:1
Start Page:id. 4 (45 pp)
Audience:Not Specified
Abstract / Description:The Spitzer Survey of Stellar Structure in Galaxies (S4G) is a deep 3.6 and 4.5 μm imaging survey of 2352 nearby (<40 Mpc) galaxies. We describe the S4G data analysis pipeline 4, which is dedicated to two-dimensional structural surface brightness decompositions of 3.6 μm images, using GALFIT3.0. Besides automatic 1-component Sérsic fits, and 2-component Sérsic bulge + exponential disk fits, we present human-supervised multi-component decompositions, which include, when judged appropriate, a central point source, bulge, disk, and bar components. Comparison of the fitted parameters indicates that multi-component models are needed to obtain reliable estimates for the bulge Sérsic index and bulge-to-total light ratio (B/T), confirming earlier results. Here, we describe the preparations of input data done for decompositions, give examples of our decomposition strategy, and describe the data products released via IRSA and via our web page (<A href="http://www.oulu.fi/astronomy/S4G_PIPELINE4/MAIN">www.oulu.fi/astronomy/S4G_PIPELINE4/MAIN</A>). These products include all the input data and decomposition files in electronic form, making it easy to extend the decompositions to suit specific science purposes. We also provide our IDL-based visualization tools (GALFIDL) developed for displaying/running GALFIT-decompositions, as well as our mask editing procedure (MASK_EDIT) used in data preparation. A detailed analysis of the bulge, disk, and bar parameters derived from multi-component decompositions will be published separately.
Free Keywords:galaxies: fundamental parameters; galaxies: kinematics and dynamics; galaxies: spiral; galaxies: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0067-0049
URL:http://cdsads.u-strasbg.fr/abs/2015ApJS..219....4S
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