TY - JOUR
T1 - THE SPITZER SURVEY of STELLAR STRUCTURE in GALAXIES (S4G)
T2 - MULTI-COMPONENT DECOMPOSITION STRATEGIES and DATA RELEASE
AU - Salo, Heikki
AU - Laurikainen, Eija
AU - Laine, Jarkko
AU - Comerón, Sebastien
AU - Gadotti, Dimitri A.
AU - Buta, Ron
AU - Sheth, Kartik
AU - Zaritsky, Dennis
AU - Ho, Luis
AU - Knapen, Johan
AU - Athanassoula, E.
AU - Bosma, Albert
AU - Laine, Seppo
AU - Cisternas, Mauricio
AU - Kim, Taehyun
AU - Muñoz-Mateos, Juan Carlos
AU - Regan, Michael
AU - Hinz, Joannah L.
AU - De Paz, Armando Gil
AU - Menendez-Delmestre, Karin
AU - Mizusawa, Trisha
AU - Erroz-Ferrer, Santiago
AU - Meidt, Sharon E.
AU - Querejeta, Miguel
N1 - Publisher Copyright: © 2015. The American Astronomical Society. All rights reserved.
PY - 2015/7/20
Y1 - 2015/7/20
N2 - 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.
AB - 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.
KW - fundamental parameters
KW - galaxies: kinematics and dynamics
KW - galaxies: spiral
KW - galaxies: structure
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U2 - 10.1088/0067-0049/219/1/4
DO - 10.1088/0067-0049/219/1/4
M3 - Review article
SN - 0067-0049
VL - 219
JO - Astrophysical Journal, Supplement Series
JF - Astrophysical Journal, Supplement Series
IS - 1
M1 - 4
ER -