2007/10/31 by Luciano Cerrigone, L. Cerrigone, J. L. Hora +5
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Flux (metallurgy) #H II region #Infrared #Infrared telescope #Spitzer Space Telescope #Stellar, planetary, and galactic studies #Telescope #Toroid #Torus #astro-ph
paper · pdf · doi:10.1086/589228
22 pages, 7 figures, accepted for publication in The Astrophysical Journal; v.2 has changes in both figures and content; preprint format
arxiv created 2008/04/15 · openalex publication_date 2008/07/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
IC 4406 is a large (about 100'' × 30'') southern bipolar planetary nebula composed of two elongated lobes extending from a bright central region where there is evidence for the presence of a large torus of gas and dust. We show new observations of this source performed with IRAC ( Spitzer Space Telescope ) and the Australia Telescope Compact Array. The radio maps show that the flux from the ionized gas is concentrated in the bright central region and originates in a clumpy structure previously observed in Hα, while in the infrared images filaments and clumps can be seen in the extended nebular envelope, the central region showing toroidal emission. Modeling of the infrared emission leads to the conclusion that several dust components are present in the nebula.