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We performed a multiwavelength study toward infrared dark cloud (IRDC)G34.43+0.24. New maps of 13CO $J$=1-0 and C18}O J=1-0 were obtained from thePurple Mountain Observatory (PMO) 13.7 m radio telescope. At 8 um (Spitzer -IRAC), IRDC G34.43+0.24 appears to be a dark filament extended by 18 arcminalong the north-south direction. Based on the association with the 870 um andC18O J=1-0 emission, we suggest that IRDC G34.43+0.24 should not be 18 arcminin length, but extend by 34 arcmin. IRDC G34.43+0.24 contains some massiveprotostars, UC H II regions, and infrared bubbles. The spatial extend of IRDCG34.43+0.24 is about 37 pc assuming a distance of 3.7 kpc. IRDC G34.43+0.24 hasa linear mass density of 1.6*10^{3} M_{sun} pc^{-1}, which is roughlyconsistent with its critical mass to length ratio. The turbulent motion mayhelp stabilizing the filament against the radial collapse. Both infraredbubbles N61 and N62 show a ringlike structure at 8 um. Particularly, N61 has adouble-shell structure, which has expanded into IRDC G34.43+0.24. The outershell is traced by 8 um and 13}CO J=1-0 emission, while the inner shell istraced by 24 um and 20 cm emission. We suggest that the outer shell (9.9*10^{5}yr) is created by the expansion of H II region G34.172+0.175, while the innershell (4.1-6.3*10^{5} yr) may be produced by the energetic stellar wind of itscentral massive star. From GLIMPSE I catalog, we selected some Class I sourceswith an age of 10^{5} yr. These Class I sources are clustered along thefilamentary molecular cloud.

Gas Kinematics and Star Formation in the Filamentary IRDC G34.43+0.24