Gas Kinematics and Star Formation in the Filamentary IRDC G34
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.
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. (Image by SUN Yan)
This paper has been published in the Astrophysical Journal.
