From left to right, and from top to bottom: Spitzer MIPS 24 μm, IRAC 8, 5.8, 4.5 and 3.6 μm, and DSS-II (red band) images of the field around the HMXB 4U 1907+09. The arrow shows the direction of peculiar velocity of 4U 1907+09, as suggested by the proper motion measurement (see text for details). A bright infrared source to the north is the maser source IRAC 19071+0946. In all panels the position of 4U 1907+09 is indicated by a circle.
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