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 (www.oulu.fi/astronomy/S4G-PIPELINE4/MAIN). 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.
|Original language||English (US)|
|Journal||Astrophysical Journal, Supplement Series|
|State||Published - Jul 20 2015|
- fundamental parameters
- galaxies: kinematics and dynamics
- galaxies: spiral
- galaxies: structure
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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S4G pipeline 4: multi-component decompositions
Salo, H. (Creator), Laurikainen, E. (Creator), Laine, J. (Creator), Comerón, S. (Contributor), Gadotti, D. A. (Creator), Buta, R. (Creator), Sheth, K. (Creator), Zaritsky, D. F. (Creator), Ho, L. (Creator), Knapen, J. (Creator), Athanassoula, E. (Creator), Bosma, A. (Creator), Laine, S. (Creator), Cisternas, M. (Creator), Kim, T. (Creator), Muñoz-Mateos, J. C. (Contributor), Regan, M. (Creator), Hinz, J. L. (Creator), De Paz, A. G. (Contributor), Menendez-Delmestre, K. (Creator), Mizusawa, T. (Creator), Erroz-Ferrer, S. (Creator), Meidt, S. E. (Creator) & Querejeta, M. (Creator), Centre de Donnees Strasbourg (CDS), 2015
DOI: 10.26093/cds/vizier.22190004, https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/219/4