Spitzer two-color image (24 μm in red and 8 μm in cyan) of bubble G52 (infrared counterpart of the H ii region G052.9−00.6). Panel a: Magnified view of the pillar-like feature with 4.5 μm in green, and 8 μm in red. Both scales run from 20 to 150 MJy beam^-1. Panel b: Magnified view of a jet-like structure seen at 8 μm. The cross represents the position of MSXG52. Panel c: Magnified view of the proto-star candidate seen at K_s band extracted from the UKIDSS survey. The green contours represent the 8 μm emission levels at 80, 100, and 140 MJy/beam.