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(Aims): We study the LMC interstellar medium in the field of the nebulaN157B, which contains a supernova remnant, an OB association, ionized gas, andhigh-density dusty filaments in close proximity. We investigate the relativeimportance of shock excitation by the SNR and photo-ionization by the OB stars,as well as possible interactions between the supernova remnant and itsenvironment. (Methods): We apply multiwavelength mapping and photometry, alongwith spatially resolved infrared spectroscopy, to identifying the nature of theISM using new infrared data from the Spitzer space observatory and X-ray,optical, and radio data from the literature. (Results): The N157B SNR has noinfrared counterpart. Infrared emission from the region is dominated by thecompact blister-type HII region associated with 2MASS J05375027-6911071 andexcited by an O8-O9 star. This object is part of an extended infrared emissionregion that is associated with a molecular cloud. We find only weak emissionfrom the shock-indicator [FeII], and both the excitation and the heating of theextended cloud are dominated by photo-ionization by the early O stars of LH99.(Conclusions): Any possible impact by the expanding SNR does not now affect theextended cloud of molecules and dust, despite the apparent overlap of SNR X-rayemission with infrared and Ha emission from the cloud. This implies that thesupernova progenitor cannot have been more massive than about 25 solar masses.

Spitzer observations of the N157B supernova remnant and its surroundings