The intermediate-mass embedded cluster GM-24 revisited: New infrared and radio observations

TAPIA, M., RODRÍGUEZ, L. F., PERSI, P., ROTH M., GÓMEZ, M.

ASTRONOMICAL JOURNAL

IOP PUBLISHING LTD

Lugar: Londres; Año: 2009 p. 4127 - 4127

0004-6256

ew and archived high-resolution infrared (IR; 1-20 μm) and radio-continuum images of the isolated embedded cluster and associated compact H II region, GM 24, are presented and measured photometrically. The nucleus of the complex is Irs 3, or IRAS 17136-3617, located at the densest part of the molecular cloud. This object is composed of at least three compact near-IR sources (A, B, and C) that are the most luminous and massive young stellar components and provide most of the ionizing energy to the cometary-shaped radio H II region. The 3.6 cm radio map shows a complex structure with an extended emission peak and two very compact components very close to Irs 3A. Large inhomogeneities in the dust density within the nebula cause considerably different morphologies in the observed emission of hydrogen recombination lines, namely Pa_beta, Brγ, and Br_alpha. No H2 line emission at 2.12 μm was detected. The embedded IR cluster is found to contain more t