MID-INFRARED IMAGING OF THE BIPOLAR PLANETARY NEBULA M2-9 FROM SOFIA
Autor: | Raghvendra Sahai, John H. Livingston, Jack T.C. Davis, Terry Herter, Luke D. Keller, Mark Morris, Michael W. Werner, J. Schoenwald, George E. Gull, J. M. De Buizer, Charles P. Henderson, Foteini Lykou, J. D. Adams |
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Jazyk: | angličtina |
Rok vydání: | 2014 |
Předmět: |
Infrared
Point source astro-ph.GA Population FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astronomy & Astrophysics Physical Chemistry Atomic Particle and Plasma Physics Bipolar outflow Astrophysics::Solar and Stellar Astrophysics Nuclear education Astrophysics::Galaxy Astrophysics Cancer Physics education.field_of_study individual (M2-9) [planetary nebulae] Molecular Astronomy and Astrophysics Planetary nebula Astrophysics - Astrophysics of Galaxies Brain Disorders Wavelength Photometry (astronomy) Mental Health Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Particle-size distribution Astrophysics::Earth and Planetary Astrophysics individual [planetary nebulae] Astronomical and Space Sciences Physical Chemistry (incl. Structural) |
Zdroj: | Werner, MW; Sahai, R; Davis, J; Livingston, J; Lykou, F; De Buizer, J; et al.(2014). MID-INFRARED IMAGING OF THE BIPOLAR PLANETARY NEBULA M2-9 FROM SOFIA. ASTROPHYSICAL JOURNAL, 780(2). doi: 10.1088/0004-637X/780/2/156. UCLA: Retrieved from: http://www.escholarship.org/uc/item/4v2709jm NASA Astrophysics Data System The Astrophysical Journal, vol 780, iss 2 ASTROPHYSICAL JOURNAL, vol 780, iss 2 |
DOI: | 10.1088/0004-637X/780/2/156. |
Popis: | We have imaged the bipolar planetary nebula M2-9 using SOFIA's FORCAST instrument in six wavelength bands between 6.6 and 37.1 $\mu m$. A bright central point source, unresolved with SOFIA's $\sim$ 4${''}$-to-5${''}$ beam, is seen at each wavelength, and the extended bipolar lobes are clearly seen at 19.7 $\mu m$ and beyond. The photometry between 10 and 25 $\mu m$ is well fit by the emission predicted from a stratified disk seen at large inclination, as has been proposed for this source by Lykou et al and by Smith and Gehrz. The principal new results in this paper relate to the distribution and properties of the dust that emits the infrared radiation. In particular, a considerable fraction of this material is spread uniformly through the lobes, although the dust density does increase at the sharp outer edge seen in higher resolution optical images of M2-9. The dust grain population in the lobes shows that small ($$ 1 $\mu m$) particles appear to be present in roughly equal amounts by mass. We suggest that collisional processing within the bipolar outflow plays an important role in establishing the particle size distribution. Comment: 40 pages, 9 figures, 2 tables |
Databáze: | OpenAIRE |
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