Infrared emission from interstellar dust cloud with two embedded sources: IRAS 19181+1349

Mid- and far-infrared maps of many Galactic star forming regions show multi ple peaks in close proximity, implying more than one embedded energy source . With the aim of understanding such interstellar clouds better, the presen t study models the case of two embedded sources. A radiative transfer schem e has been developed to deal with a uniform density dust cloud in a cylindr ical geometry, which includes isotropic scattering in addition to the emiss ion and absorption processes. This scheme has been applied to the Galactic star forming region associated with IRAS 19181 + 1349, which shows observat ional evidence for two embedded energy sources. Two independent modelling a pproaches have been adopted, viz., to fit the observed spectral energy dist ribution (SED) best; or to fit the various radial profiles best, as a funct ion of wavelength. Both the models imply remarkably similar physical parame ters.