The environmental dependence of the structure of outer galactic discs in STAGES spiral galaxies

We present an analysis ofV-band radial surface brightness profiles for spiral galaxies from the field and cluster environments usingHubble Space Telescope/Advanced Camera for Surveys imaging and data from the Space Telescope A901/2 Galaxy Evolution Survey (STAGES). We use a large sample of ~330 face-on to intermediately inclined spiral galaxies and assess the effect of the galaxy environment on the azimuthally averaged radial surface brightness μ profiles for each galaxy in the outer stellar disc (24 < μ < 26.5magarcsec^-2). For galaxies with a purely exponential outer disc (~50per cent), we determine the significance of an environmental dependence on the outer disc scalelengthh_out. For galaxies with a broken exponential in their outer disc, either down-bending (truncation, ~10per cent) or up-bending (antitruncation, ~40per cent), we measure the strengthT(outer-to-inner scalelength ratio, log₁₀h_out/h_in) of the μ breaks and determine the significance of an environmental dependence on break strengthT. Surprisingly, we find no evidence to suggest any such environmental dependence on either outer disc scalelengthh_out or break strengthT, implying that the galaxy environment is not affecting the stellar distribution in the outer stellar disc. We also find that for galaxies with small effective radii (r_e < 3kpc) there is a lack of outer disc truncations in both the field and cluster environments. Our results suggest that the stellar distribution in the outer disc of spiral galaxies is not significantly affected by the galaxy environment.