Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 740, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/740/1/L29
Keywords
galaxies: active; galaxies: high-redshift; galaxies: individual (SMMJ02399-136, H1413+117); galaxies: starburst; submillimeter: galaxies
Categories
Funding
- NSF [AST-00736289, AST-0722220]
- NASA [NNX10AM09H]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [838261] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1105874, 1109476] Funding Source: National Science Foundation
- NASA [NNX10AM09H, 130175] Funding Source: Federal RePORTER
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We report the first detections of the [N II] 122 mu m line from a high-redshift galaxy. The line was strongly (>6 sigma) detected from SMMJ02399-0136, and H1413 + 117 (the Cloverleaf QSO) using the Redshift (z) and Early Universe Spectrometer on the Caltech Submillimeter Observatory. The lines from both sources are quite bright with line to far-infrared (FIR) continuum luminosity ratios that are similar to 7.0 x 10(-4) (Cloverleaf) and 2.1 x 10(-3) (SMMJ02399). With ratios 2-10 times larger than the average value for nearby galaxies, neither source exhibits the line-to-continuum deficits seen in nearby sources. The line strengths also indicate large ionized gas fractions, similar to 8%-17% of the molecular gas mass. The [O III]/[N II] line ratio is very sensitive to the effective temperature of ionizing stars and the ionization parameter for emission arising in the narrow-line region (NLR) of an active galactic nucleus (AGN). Using our previous detection of the [O III] 88 mu m line, the [O III]/[N II] line ratio for SMMJ02399-0136 indicates that the dominant source of the line emission is either stellar H II regions ionized by O9.5 stars, or the NLR of the AGN with ionization parameter log(U) = -3.3 to -4.0. A composite system, where 30%-50% of the FIR lines arise in the NLR also matches the data. The Cloverleaf is best modeled by a superposition of similar to 200 M82-like starbursts accounting for all of the FIR emission and 43% of the [N II] line. The remainder may come from the NLR. This work demonstrates the utility of the [N II] and [O III] lines in constraining properties of the ionized medium.
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