INFRARED ABSORPTION LINES TOWARD NGC 7538 IRS 1: ABUNDANCES OF H2, H3+, AND CO
INFRARED ABSORPTION LINES TOWARD NGC 7538 IRS 1: ABUNDANCES OF H2, H3+, AND CO
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朝向 NGC 7538 IRS 1 的红外吸收线:H2、H3 和 CO 的丰度
DOI:
10.1088/0004-637x/806/1/57
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Geballe
中科院分区:
文献类型:
--
作者:
Geballe
We report high-resolution near-infrared absorption spectroscopy of H 2, H 3+, and CO toward the young high mass object NGC 7538 IRS 1. The v= 1–0 H 2 S (0) line and lines in the CO v= 2–0 band were detected; the v= 1–0 H 2 S (1) line and the v= 1–0 H 3+ lines [R (1, 1) l, R (1, 0), R (1, 1) u] were not detected. The line of sight traverses two clouds, with temperatures 45 and 259 K and with roughly equal column densities of CO. Assuming that H 2 is at the same temperature as CO and that the two species are uniformly mixed,[H 2]/[CO]= 3600±1200. NGC 7538 is the most distant object from the Galactic center for which [H 2]/[CO] has been directly measured using infrared absorption spectroscopy.
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DOI:
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发表时间:
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期刊:
The Astrophysical Journal
影响因子:
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发表时间:
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期刊:
The Astrophysical Journal
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