English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The Spitzer Survey of Stellar Structure in Galaxies (S$^4$G, Sheth et. al.2010) 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 dedicatedto 2-dimensional structural surface brightness decompositions of 3.6 $\mu$mimages, using GALFIT3.0 \citep{peng2010}. Besides automatic 1-componentS\'ersic fits, and 2-component S\'ersic bulge + exponential disk fits, wepresent human supervised multi-component decompositions, which include, whenjudged appropriate, a central point source, bulge, disk, and bar components.Comparison of the fitted parameters indicates that multi-component models areneeded to obtain reliable estimates for the bulge S\'ersic index andbulge-to-total light ratio ($B/T$), confirming earlier results\citep{laurikainen2007, gadotti2008, weinzirl2009}. In this first paper, wedescribe the preparations of input data done for decompositions, give examplesof our decomposition strategy, and describe the data products released via IRSAand via our web page ({\bf \tt www.oulu.fi/astronomy/S4G\_PIPELINE4/MAIN}).These products include all the input data and decomposition files in electronicform, making it easy to extend the decompositions to suit specific sciencepurposes. We also provide our IDL-based visualization tools (GALFIDL) developedfor displaying/running GALFIT-decompositions, as well as our mask editingprocedure (MASK\_EDIT) used in data preparation. In the second paper we willpresent a detailed analysis of the bulge, disk, and bar parameter derived frommulti-component decompositions.

Spitzer Survey of Stellar Structure in Galaxies (S$^4$G). The Pipeline 4: Multi-component decomposition strategies and data release