Discovery of an H2CO 6 Centimeter Maser in IRAS 18566+0408

Details Discovery of an H2CO 6 Centimeter Maser in IRAS 18566+0408 Discovery of an H2CO 6 Centimeter Maser in IRAS 18566+0408

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...618..339a&link_type=abstract

The Astrophysical Journal, Volume 618, Issue 1, pp. 339-343.

Astronomy and Astrophysics

Astronomy

13

Ism: H Ii Regions, Ism: Molecules, Masers, Radio Lines: Ism, Stars: Formation

Scientific paper

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.

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