Detection of [N [CSC]ii[/CSC]] λ5755 Emission from Low-Density Ionized Interstellar Gas | Zendy

R. J. Reynolds | Zendy; N. C. Sterling | Zendy; L. M. Haffner | Zendy; S. L. Tufte | Zendy

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Detection of [N [CSC]ii[/CSC]] λ5755 Emission from Low-Density Ionized Interstellar Gas

Author(s) -

R. J. Reynolds,

N. C. Sterling,

L. M. Haffner,

S. L. Tufte

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/319119

Subject(s) - astrophysics , physics , ionization , line (geometry) , electron density , h alpha , line of sight , electron temperature , emission spectrum , stars , plasma , astronomy , spectral line , atomic physics , ion , geometry , mathematics , quantum mechanics

The extremely faint, temperature sensitive ``auroral'' emission line [N II] 5755 has been detected from the low density ionized gas along the sight line toward l = 130.0, b = -7.5 using the Wisconsin H-Alpha Mapper (WHAM). The intensity of this emission line, relative to the red nebular line [N II] 6584, is found to be twice that observed in bright, classical H II regions surrounding O stars. This implies that the electron temperature of the ionized gas along this sight line is about 2000 K higher than the H II regions, and that the enhanced [N II] 6584/H-Alpha and [S II] 6716/H-Alpha intensity ratios in this low density gas are due at least in part to an elevated temperature

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