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Date and Time of the Query: 2019-08-20 T22:08:22 PDT
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For refcode 2005ApJ...621..256S:
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Copyright by American Astronomical Society. Reproduced by permission
2005ApJ...621..256S Simulating the Spitzer Mid-Infrared Color-Color Diagrams Anna Sajina, Mark Lacy, and Douglas Scott Abstract. We use a simple parameterization of the mid-IR spectra of a wide range of galaxy types in order to predict their distribution in the Infrared Array Camera (IRAC) 3.6, 4.5, 5.8, and 8.0 microns and Multiband Photometer for Spitzer 24 microns color-color diagrams. We distinguish three basic spectral types by the energetically dominant component in the 3 - 12 microns regime: stellar-dominated, polycyclic aromatic hydrocarbon (PAH)-dominated, and continuum-dominated. We use a Markov chain Monte Carlo approach to arrive at a more systematic and robust representation of the mid-IR spectra of galaxies than do more traditional approaches. We find that IRAC color-color plots are well suited to distinguishing the above spectral types, while the addition of 24 microns data allows us to suggest practical three-color cuts that preferentially select higher redshift sources of a specific type. We compare our simulations with the color-color plot obtained by the Spitzer First Look Survey and find reasonable agreement. Lastly, we discuss other applications as well as future directions for this work. Keywords: Infrared: Galaxies, Methods: Data Analysis
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