THE SPITZER SURVEY OF STELLAR STRUCTURE IN GALAXIES (S{sup 4}G): MULTI-COMPONENT DECOMPOSITION STRATEGIES AND DATA RELEASE

Journal Article · Mon Jul 20 00:00:00 EDT 2015 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/219/1/4· OSTI ID:22520184

Salo, Heikki; Laurikainen, Eija; Laine, Jarkko; Comerón, Sebastien ^[1]; Gadotti, Dimitri A.; Kim, Taehyun ^[2]; Buta, Ron ^[3]; Sheth, Kartik; Muñoz-Mateos, Juan Carlos ^[4]; Zaritsky, Dennis; Hinz, Joannah L. ^[5]; Ho, Luis ^[6]; Knapen, Johan; Cisternas, Mauricio ^[7]; Athanassoula, E.; Bosma, Albert ^[8]; Laine, Seppo ^[9]; Regan, Michael ^[10]; De Paz, Armando Gil ^[11]; Menendez-Delmestre, Karin ^[12] ; others, and

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1. Astronomy and Space Physics, University of Oulu, FI-90014 (Finland)
2. European Southern Observatory, Casilla 19001, Santiago 19 (Chile)
3. Department of Physics and Astronomy, University of Alabama, Box 870324, Tuscaloosa, AL 35487 (United States)
4. National Radio Astronomy Observatory/NAASC, 520 Edgemont Road, Charlottesville, VA 22903 (United States)
5. University of Arizona, 933 N. Cherry Ave, Tucson, AZ 85721 (United States)
6. Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871 (China)
7. Instituto de Astrofísica de Canarias, E-38205 La Laguna (Spain)
8. Aix Marseille Universite, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, F-13388, Marseille (France)
9. Spitzer Science Center—Caltech, MS 314-6, Pasadena, CA 91125 (United States)
10. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
11. Departamento de Astrofísica, Universidad Complutense de Madrid, Madrid E-28040 (Spain)
12. Observatorio do Valongo, Universidade Federal de Rio de Janeiro, Ladeira Pedro Antonio, 43, Saude CEP 20080-090, Rio de Janeiro—RJ (Brazil)

The Spitzer Survey of Stellar Structure in Galaxies (S{sup 4}G) is a deep 3.6 and 4.5 μm imaging survey of 2352 nearby (<40 Mpc) galaxies. We describe the S{sup 4}G 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.

• OSTI ID: 22520184
• Journal Information: Astrophysical Journal, Supplement Series, Vol. 219, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTRONOMY
BRIGHTNESS
COMPARATIVE EVALUATIONS
DATA ANALYSIS
GALAXIES
IMAGES
POINT SOURCES
STARS
SURFACES
TWO-DIMENSIONAL SYSTEMS
VISIBLE RADIATION