2006/09/15 by R. Siebenmorgen, Ralf Siebenmorgen, Siebenmorgen, Ralf +3
Environmental Science · Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Impact of Light on Environment and Health #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0609434
Studying Galaxy Evolution with Spitzer and Herschel CUP Conference Series, 2006; V. Charmandaris, D. Rigopoulou, N. Kylafis (eds.); 4 pages, 2 figures
arxiv created 2006/09/15 · openalex publication_date 2006/09/15 · arxiv updated 2009/12/01 · openalex created_date 2022/09/30 · openalex updated_date 2026/07/28
We provide a library of some 7000 SEDs for starbursts and ultra luminous galaxies (http://www.eso.org/~rsiebenm/sbmodels). Its purpose is to quickly obtain estimates of the basic parameters, such as luminosity, size and dust or gas mass and to predict the flux at yet unobserved wavelengths. The procedure is simple and consists of finding an element in the library that matches the observations. The objects may be in the local universe or at high z. We calculate the radiative transfer in spherical symmetry for a stellar cluster permeated by an interstellar medium with standard (Milky Way) dust properties. The cluster contains two stellar populations: old bulge stars and OB stars. Because the latter are young, a certain fraction of them will be embedded in compact clouds which constitute hot spots that determine the MIR fluxes. We present SEDs for a broad range of luminosities, sizes and obscurations. We argue that the assumption of spherical symmetry and the neglect of clumpiness of the medium are not severe shortcomings for computing the dust emission. The validity of the approach is demonstrated by matching the SED of the best studied galaxies, including M82 and Arp220, by library elements; one example is shown for a galaxy at high redshift (z ~ 3). Generally, one finds an element which fits the observed SED very well, and the parameters defining the element are in full accord with what is known about the galaxy from detailed studies.