4.8-GHz H2CO maser emission in SGR B2

Astronomy and Astrophysics – Astronomy

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Formaldehyde, Interstellar Gas, Interstellar Masers, Milky Way Galaxy, Molecular Clouds, Radio Astronomy, Continuous Spectra, H Ii Regions, Hydrogen Ions, Line Spectra

Scientific paper

VLA observations with an angular resolution of 2 arcsec have resulted in the discovery of five 4.8-GHz H2CO masers in the H II-region/molecular-cloud complex Sgr B2. Only one other H2CO maser is known (in NGC 7538). Observed with a velocity resolution of 6 km s-1, the maser intensities ranged from 15 to 140 mJy. The strongest masers are located close to H II continuum emission and OH and H2O masers.

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