Showing papers by "N. C. Wickramasinghe published in 2005"
TL;DR: In this paper, Motta et al. compared the spectra of a distant gravitationally lensed quasar (z = 1.38) with the extinction curve of the lens galaxy of the Galaxy, LMC and SMC and found that the SBS 0909 + 532 curve is compatible with three component models of classical spherical grains and PAHs.
Abstract: Comparison of recent spectra by V. Motta et al. (V. Motta et al.: Astrophys. J. 574, 719–725) of two images of a distant gravitationally lensed quasar (z = 1.38) leads to an extinction curve of the lens galaxy (z = 0.83) showing clear evidence of a 2175A absorption feature. We compare these data with measured extinction curves from the Galaxy, LMC and SMC and with predictions from models. As it has been found by other authors in the Local Group galaxies we found that the SBS 0909 + 532 curve is compatible with three component models of classical spherical grains and PAHs. We note that apart from this standard point of view, the fits also admit an interpretation in terms of products of a biological origin involving three grain components.
9 citations