Discovery of an H2CO 6 centimeter maser in IRAS 18566+0408

被引：22
作者：
Araya, E
Hofner, P
Kurtz, S
Linz, H
Olmi, L
Sewilo, M
Watson, C
Churchwell, E
机构：
[1] New Mexico Inst Min & Technol, Dept Phys, Socorro, NM 87801 USA
[2] Natl Radio Astron Observ, Socorro, NM 87801 USA
[3] Univ Nacl Autonoma Mexico, Ctr Radioastron & Astrofis, Morelia 58089, Michoacan, Mexico
[4] Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany
[5] Max Planck Inst Astron, D-69117 Heidelberg, Germany
[6] CNR, Ist Radioastron, Sez Firenze, I-50125 Florence, Italy
[7] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
来源：
ASTROPHYSICAL JOURNAL | 2005年 / 618卷 / 01期
关键词：
HII regions; ISM : molecules; masers; radio lines : ISM; stars : formation;
D O I：
10.1086/425902
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report VLA observations toward IRAS 18566+0408 conducted to determine the nature of the H2CO 6 cm emission line recently detected by Araya and coworkers. Our observations clearly show that the H2CO source is due to maser emission, making IRAS 18566+0408 only the fourth Galactic H2CO 6 cm maser source, out of five known H2CO emitters. We also report detection of a weak 2 cm continuum source that is coincident with the H2CO maser. Given the current observational constraints, the maser could be due to the radiative pumping mechanism proposed by Boland de Jong; however, the coincidence of the new H2CO maser with 22 GHz H2O masers suggests that shocked molecular gas could also play a role in its excitation.
引用
收藏
页码：339 / 343
页数：5
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