DETECTION OF ABSORPTION BY H-2 IN MOLECULAR CLOUDS - A DIRECT MEASUREMENT OF THE H2CO RATIO

被引：236

作者：

LACY, JH

KNACKE, R

GEBALLE, TR

TOKUNAGA, AT

机构：

[1] UNIV HAWAII,INFRARED TELESCOPE FAC,HONOLULU,HI 96822

[2] JOINT ASTRON CTR,HILO,HI 96720

[3] PENN STATE UNIV,DIV SCI,ERIE,PA 16563

[4] UNIV HAWAII,INST ASTRON,HONOLULU,HI 96822

来源：

ASTROPHYSICAL JOURNAL | 1994年 / 428卷 / 02期

关键词：

INFRARED ISM; LINES AND BANDS; ISM; ABUNDANCES; MOLECULES;

D O I：

10.1086/187395

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Vibrational absorption by H-2 and CO has been searched for toward infrared sources embedded in molecular clouds. H-2 was detected toward NGC 2024 IRS 2 and possibly toward NGC 2264 (GL 989). CO was detected toward both sources. The results are consistent with the H-2 ortho: para ratio being equilibrated at the cloud temperature. Toward NGC 2024, H-2: CO = 3700(-2600)+3100 (2 sigma limits), and toward NGC 2264, H-2: CO < 6000. Approximately one-third of all carbon is in gas-phase CO.

引用

页码：L69 / L72

页数：4

共 23 条

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