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The Spitzer survey of stellar structure in galaxies (S⁴G) : multi-component decomposition strategies and data release

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Abstract
The Spitzer Survey of Stellar Structure in Galaxies (S(4)G) is a deep 3.6 and 4.5 mu m imaging survey of 2352 nearby (<40 Mpc) galaxies. We describe the S(4)G data analysis pipeline 4, which is dedicated to two-dimensional structural surface brightness decompositions of 3.6 mu m images, using GALFIT3.0. Besides automatic 1-component Sersic fits, and 2-component Sersic 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 Sersic 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.
Keywords
3.6 MU-M, SPIRAL GALAXIES, ELLIPTIC GALAXIES, BARRED GALAXIES, SCALING, RELATIONS, HUBBLE SEQUENCE, SECULAR EVOLUTION, CLASSICAL BULGES, NEARBY, GALAXIES, MORPHOLOGICAL CLASSIFICATION, galaxies: fundamental parameters, galaxies: kinematics and dynamics, galaxies: spiral, galaxies: structure

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MLA
Salo, Heikki, et al. “The Spitzer Survey of Stellar Structure in Galaxies (S4G) : Multi-Component Decomposition Strategies and Data Release.” ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, vol. 219, no. 1, 2015.
APA
Salo, H., Laurikainen, E., Laine, J., Comeron, S., Gadotti, D. A., Buta, R., … Querejeta, M. (2015). The Spitzer survey of stellar structure in galaxies (S4G) : multi-component decomposition strategies and data release. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 219(1).
Chicago author-date
Salo, Heikki, Eija Laurikainen, Jarkko Laine, Sebastien Comeron, Dimitri A Gadotti, Ron Buta, Kartik Sheth, et al. 2015. “The Spitzer Survey of Stellar Structure in Galaxies (S4G) : Multi-Component Decomposition Strategies and Data Release.” ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 219 (1).
Chicago author-date (all authors)
Salo, Heikki, Eija Laurikainen, Jarkko Laine, Sebastien Comeron, Dimitri A Gadotti, Ron Buta, Kartik Sheth, Dennis Zaritsky, Luis Ho, Johan Knapen, E Athanassoula, Albert Bosma, Seppo Laine, Mauricio Cisternas, Taehyun Kim, Juan Carlos Munoz-Mateos, Michael Regan, Joannah L Hinz, Armando Gil de Paz, Karin Menendez-Delmestre, Trisha Mizusawa, Santiago Erroz-Ferrer, Sharon Meidt van der Wel, and Miguel Querejeta. 2015. “The Spitzer Survey of Stellar Structure in Galaxies (S4G) : Multi-Component Decomposition Strategies and Data Release.” ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 219 (1).
Vancouver
1.
Salo H, Laurikainen E, Laine J, Comeron S, Gadotti DA, Buta R, et al. The Spitzer survey of stellar structure in galaxies (S4G) : multi-component decomposition strategies and data release. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES. 2015;219(1).
IEEE
[1]
H. Salo et al., “The Spitzer survey of stellar structure in galaxies (S4G) : multi-component decomposition strategies and data release,” ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, vol. 219, no. 1, 2015.
@article{8622283,
  abstract     = {The Spitzer Survey of Stellar Structure in Galaxies (S(4)G) is a deep 3.6 and 4.5 mu m imaging survey of 2352 nearby (<40 Mpc) galaxies. We describe the S(4)G data analysis pipeline 4, which is dedicated to two-dimensional structural surface brightness decompositions of 3.6 mu m images, using GALFIT3.0. Besides automatic 1-component Sersic fits, and 2-component Sersic 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 Sersic 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.},
  articleno    = {4},
  author       = {Salo, Heikki and Laurikainen, Eija and Laine, Jarkko and Comeron, Sebastien and Gadotti, Dimitri A and Buta, Ron and Sheth, Kartik and Zaritsky, Dennis and Ho, Luis and Knapen, Johan and Athanassoula, E and Bosma, Albert and Laine, Seppo and Cisternas, Mauricio and Kim, Taehyun and Munoz-Mateos, Juan Carlos and Regan, Michael and Hinz, Joannah L and Gil de Paz, Armando and Menendez-Delmestre, Karin and Mizusawa, Trisha and Erroz-Ferrer, Santiago and van der Wel, Sharon Meidt and Querejeta, Miguel},
  issn         = {0067-0049},
  journal      = {ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES},
  keywords     = {3.6 MU-M,SPIRAL GALAXIES,ELLIPTIC GALAXIES,BARRED GALAXIES,SCALING,RELATIONS,HUBBLE SEQUENCE,SECULAR EVOLUTION,CLASSICAL BULGES,NEARBY,GALAXIES,MORPHOLOGICAL CLASSIFICATION,galaxies: fundamental parameters,galaxies: kinematics and dynamics,galaxies: spiral,galaxies: structure},
  language     = {eng},
  number       = {1},
  pages        = {45},
  title        = {The Spitzer survey of stellar structure in galaxies (S⁴G) : multi-component decomposition strategies and data release},
  url          = {http://dx.doi.org/10.1088/0067-0049/219/1/4},
  volume       = {219},
  year         = {2015},
}

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