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
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