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Using images from the Spitzer GLIMPSE Legacy survey, we have identified morethan 300 extended 4.5 micron sources (abbreviated EGO, Extended Green Object,for the common coding of the [4.5] band as green in 3-color composite IRACimages). We present a catalog of these EGOs, including integrated flux densitymeasurements at 3.6, 4.5, 5.8, 8.0, and 24 microns from the GLIMPSE and MIPSGALsurveys. The average angular separation between a source in our sample and thenearest IRAS point source is >1 arcminute. The majority of EGOs are associatedwith infrared dark clouds (IRDCs), and where high-resolution 6.7 GHz methanolmaser surveys overlap the GLIMPSE coverage, EGOs and 6.7 GHz methanol masersare strongly correlated. Extended 4.5 micron emission is thought to traceshocked molecular gas in protostellar outflows; the association of EGOs withIRDCs and 6.7 GHz methanol masers suggests that extended 4.5 micron emissionmay pinpoint outflows specifically from massive protostars. The mid-infraredcolors of EGOs lie in regions of color-color space occupied by young protostarsstill embedded in infalling envelopes.

A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates