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

页码：339 / 343

页数：5

共 21 条

[1] A search for H2CO 6 centimeter emission toward young massive stellar objects [J].