Near-infrared sources in the molecular cloud G35.2-0.74

Astronomy and Astrophysics – Astronomy

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Infrared Stars, Molecular Clouds, Near Infrared Radiation, Early Stars, H Ii Regions, Hydroxyl Emission, Water Masers

Scientific paper

Near-infrared (1-4 microns) observations of the molecular cloud G35.2-0.74 are presented. The observations were carried out using the InSb infrared spectrometer-photometer on the 2.1-m telescope of the Observatorio Astronomico Nacional in Mexico. The instrumentation was described in detail in a previous study. The observations indicate the presence of four infrared sources in the vicinity of two previously reported centers of star formation in G35.2-0.74. The northern part of the cloud contains three point sources which are interpreted as highly obscured stars. The star Irs 1 coincided with H2O and OH maser emission and appears to be a very young early-type star reddened by Av of about 54. It is suggested that Irs 1 is the source of pumping energy to the masers, the ionizing energy to the H II regions, and the outflow that leads to the observed bipolarity. The southern part of G35.2-0.74 shows a diffuse source at 2.2 microns with a flux distribution in the short-wavelength region compatible with free-free emission. The evolutionary aspects of the region are discussed in terms of the available observations.

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