SIMBAD references

2017MNRAS.466.4364C - Mon. Not. R. Astron. Soc., 466, 4364-4369 (2017/April-3)

Detections of 2 cm formaldehyde emissions towards Galactic star-forming regions with 6 cm counterpart.

CHEN X., SHEN Z.-Q., LI X.-Q., YANG K., LI J., WANG J.-Z., WU Y.-J., ZHAO R.-B., WANG J.-Q., DONG J., JIANG D.-R. and LI B.

Abstract (from CDS):

We report the detections of H2CO emission at the 2 cm transition towards Galactic star-forming regions with known 6 cm counterpart using the Shanghai Tianma Radio Telescope. One significant detection (in NGC 7538) and two possible detections (in G23.01-0.41 and G29.96-0.02) were made. Comparing with previous observations, we found that there is a time lag of appearance of 2 and 6 cm emissions detected in NGC 7538, contradicting with the prediction of radiative pumping via radio continuum radiation. Combinations of the variability of 6 cm masers in NGC 7538 suggest that collisional pumping via high-velocity shocks could better explain the 6 cm H2CO maser emission. Under this scheme, excitation of the 2 cm maser may require a higher collision energy compared to the 6 cm transition.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): masers - stars: formation - ISM: molecules - radio lines: ISM - radio lines: ISM

Simbad objects: 8

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