Combining data of PMO 13.7 m radio telescope and other archive data,  authors from National Astronomical Observatory (NAO) and PMO performed a  multi-wavelength study toward IRDC G34.43+0.24. They found that at 8 μm  (Spitzer-IRAC), IRDC G34.43+0.24 appears to be a dark filament extended  by 18‧  along the north-south direction. Based on the association with the 870  μm and C18O J = 1-0 emission, they suggest that IRDC G34.43+0.24 should  not be 18‧ in length, but extend to 34‧. IRDC G34.43+0.24 contains some massive protostars.

    UC HII regions (G34.172+0.175), and infrared bubbles (N61 and N62).  Both infrared bubbles N61 and N62 show a ringlike structure at 8 μm. 

N61  has a double-shell structure that has expanded into IRDC G34.43+0.24.  The outer shell is traced by 8 μm and 13CO J = 1-0 emission, while the  inner shell is traced by 24 μm and 20 cm emission. They suggest that the  outer shell is created by the expansion of HII region . G34.172+0.175, while the inner shell may be produced by the energetic stellar wind of its central massive star. 

This paper has been published in ApJ, available at http://adsabs.harvard.edu/abs/2016ApJ...819..117X 

By with SUN Yan

     Fig.1. Contours of C18O J=1-0 emission superimposed on the 8 um  emission map (gray). The integrated velocity is from 53 to 65 km/s. The  six green circles indicate the bubbles identified by simpson et al.  (2012) I, II, and III. The red dot symbols mark the mapping points.