Star formation in a clustered environment around the UCHII region in IRAS 20293+3952

Abstract

We aim at studying the cluster environment surrounding the UCHII region in IRAS 20293+3952, a region in the first stages of formation of a cluster around a high-mass star. BIMA and VLA were used to observe the 3 mm continuum, N2H+(1-0), NH3(1,1) and (2,2), and CH3OH(2-1) emission of the surroundings of the UCHII region. We studied the kinematics of the region and computed the rotational temperature and column density maps by fitting the hyperfine structure of N2H+ and NH3. The dense gas traced by N2H+ and NH3 shows two different clouds, a main cloud to the east of the UCHII region, of 0.5 pc and 250 Msun, and a western cloud, of 0.15 pc and 30 Msun. The dust emission reveals two strong components in the northern side of the main cloud, associated with Young Stellar Objects (YSOs) driving molecular outflows, and two fainter components in the southern side, with no signs of star forming activity. Regarding the CH3OH, we found strong emission in a fork-like structure associated with outflow B, as well as emission associated with outflow A. The rotational temperature is higher in the northern side of the main cloud, around 22 K, where there are most of the YSOs, than in the southern side, around 16 K. There is strong chemical differentiation in the region, since we determined low values of the NH3/N2H+ ratio, around 50, associated with YSOs in the north of the main cloud, and high values, up to 300, associated with cores with no detected YSOs, in the south of the main cloud. Such a chemical differentiation is likely due to abundance/depletion effects. Finally, interaction between the different sources in the region is important, mainly through their UV radiation and outflows (abridged).

arXiv comment17 pages, 12 figures, accepted to A&A

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