The ratio of optical to near-infrared emission line strengths inSii as electron density diagnostics for planetary nebulae

1991 ◽  
Vol 186 (2) ◽  
pp. 277-281 ◽  
Author(s):  
F. P. Keenan
Keyword(s):  
Emission Line ◽  
Electron Density ◽  
Near Infrared ◽  
Planetary Nebulae ◽  
Infrared Emission ◽  
Density Diagnostics ◽  
Near Infrared Emission ◽  
Line Strengths

Near-infrared emission-line spectra of the Orion Nebula, NGC 4151, and other Seyfert galaxies

1990 ◽  
Vol 352 ◽  
pp. 561 ◽  
Author(s):  
Donald E. Osterbrock ◽  
Richard A. Shaw ◽  
Sylvain Veilleux
Keyword(s):  
Emission Line ◽  
Near Infrared ◽  
Seyfert Galaxies ◽  
Infrared Emission ◽  
Orion Nebula ◽  
Ngc 4151 ◽  
Near Infrared Emission

scholarly journals Infrared Emission-Lines and the Stellar Temperature

1993 ◽  
Vol 155 ◽  
pp. 89-89 ◽  
Author(s):  
Sueli M. Viegas ◽  
Ruth Gruenwald
Keyword(s):  
Near Infrared ◽  
Planetary Nebulae ◽  
Infrared Emission ◽  
Emission Lines ◽  
Heavy Elements ◽  
Atomic Transitions ◽  
Stellar Temperature ◽  
Near Infrared Emission

Observations of near infrared emission-lines are becoming available and can be a powerful tool to improve our knowledge on planetary nebulae properties. For wavelengths in the range 1 to 5 μm, the emission-lines correspond to atomic transitions of high ionized species of heavy elements. In particular, the [Si VI] 1.96μm and [Si VII] 2.48μm lines have already been detected (Ashley and Hyland, 1988).

scholarly journals Near Infrared Emission of Neutral Carbon from Photon-Dominated Regions

1992 ◽  
Vol 150 ◽  
pp. 333-334
Author(s):  
V. Escalante ◽  
A. Sternberg ◽  
A. Dalgarno
Keyword(s):  
Field Intensity ◽  
Radiative Recombination ◽  
Near Infrared ◽  
Planetary Nebulae ◽  
Infrared Emission ◽  
Emission Lines ◽  
Radiation Fields ◽  
Ngc 7027 ◽  
Near Infrared Emission ◽  
Intense Radiation

Detailed calculations are reported of the intensities of the near infrared forbidden lines of neutral carbon atoms at λ 985.0 nm, 982.3 nm and 872.7 nm emitted from dense clouds subjected to intense radiation fields. The metastable levels that produce the lines are excited by radiative recombination of the C+ ions produced by photoionization. Impacts of electrons with C atoms in the heated edge zones of the clouds contribute an insignificant part to the excitation. The lines observed in M42 and NGC 2024 can be interpreted as arising in gas with densities in excess of 105 cm−3 and radiation fields with intensities between 103 and 106 times the average interstellar field intensity. Radiative recombination of C+ ions may also be an important source of the emission lines detected in the planetary nebulae NGC 6270 and NGC 7027.

scholarly journals Near-Infrared Emission-Line Galaxies in the Hubble Deep Field North

2000 ◽  
Vol 52 (1) ◽  
pp. 73-79 ◽  
Author(s):  
Fumihide Iwamuro ◽  
Kentaro Motohara ◽  
Toshinori Maihara ◽  
Jun'ichi Iwai ◽  
Hirohisa Tanabe ◽  
...  
Keyword(s):  
Emission Line ◽  
Near Infrared ◽  
Infrared Emission ◽  
Emission Line Galaxies ◽  
Hubble Deep Field ◽  
Near Infrared Emission

Near-Infrared Emission-Line Spectrum of NGC 1068

1996 ◽  
Vol 108 ◽  
pp. 183 ◽  
Author(s):  
Donald E. Osterbrock ◽  
Jon P. Fulbright
Keyword(s):  
Emission Line ◽  
Near Infrared ◽  
Infrared Emission ◽  
Line Spectrum ◽  
Emission Line Spectrum ◽  
Ngc 1068 ◽  
Near Infrared Emission

Near-infrared emission-line and continuum observations from the 1991 eclipse

1994 ◽  
Vol 436 ◽  
pp. 368 ◽  
Author(s):  
M. J. Penn ◽  
J. Arnaud ◽  
D. L. Mickey ◽  
B. J. Labonte
Keyword(s):  
Emission Line ◽  
Near Infrared ◽  
Infrared Emission ◽  
Near Infrared Emission

Near-infrared emission-line images of three Herbig-Haro objects

1991 ◽  
Vol 371 ◽  
pp. 226 ◽  
Author(s):  
Karl R. Stapelfeldt ◽  
Nicholas Z. Scoville ◽  
Charles A. Beichman ◽  
J. Jeff Hester ◽  
Thomas N., III Gautier
Keyword(s):  
Emission Line ◽  
Near Infrared ◽  
Infrared Emission ◽  
Near Infrared Emission
Sign in / Sign up

Export Citation Format

Share Document