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Infrared Coronal Emission Lines and the Possibility of their Laser Emission in Seyfert Nuclei

Published online by Cambridge University Press:  19 July 2016

Matthew A. Greenhouse ,
Uri Feldman ,
Howard A. Smith ,
Marcel Klapisch ,
Anand K. Bhatia  and
Avi Bar-Shalom
Matthew A. Greenhouse
Affiliation:
Laboratory for Astrophysics, National Air and Space Museum, Smithsonian Institution, Washington, DC 20560
Uri Feldman
Affiliation:
Solar Terrestrial Relationships Branch, Naval Research Laboratory, Washington, DC 20375
Howard A. Smith
Affiliation:
Laboratory for Astrophysics, National Air and Space Museum, Smithsonian Institution, Washington, DC 20560
Marcel Klapisch
Affiliation:
Artep Inc., Naval Research Laboratory, Code 4694, Washington, DC 20375
Anand K. Bhatia
Affiliation:
NASA/Goddard Space Flight Center, Greenbelt, MD 20771
Avi Bar-Shalom
Affiliation:
Nuclear Research Center of the Negev, P.O. Box 9001, Beer Sheva, Israel

Extract

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Infrared coronal emission lines are providing a new window for observation and analysis of highly ionized gas in Galactic and extragalactic sources such as Seyfert nuclei and classical novae shells. These lines are expected to be primary coolants in colliding galaxies, galaxy cluster cooling flows, cometary-compact HII regions, and supernova remnants. In this poster, we summarize results discussed in detail by Greenhouse et al. 1993, ApJS, 88, 23. We discuss approximately 74 infrared (1 < λ μm < 280) transitions within the ground configurations 2s 22pk and 3s 23pk (k = 1 to 5) or the first excited configurations 2s2p and 3s3p of highly ionized (χ ≥ 100 eV) O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Fe, and Ni. We present results from detailed balance calculations, critical densities for collisional de-excitation, intrinsic photon rates, branching ratios, and excitation temperatures for the transitions. The temperature and density parameter space for dominant cooling via infrared coronal lines is presented, and the relationship of infrared and optical coronal lines is discussed.

Type
Poster Contributions: Line Studies
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 447
Copyright
Copyright © Kluwer 1994