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Supernova remnants, planetary nebulae and the distance to NGC 4214

Mutchler, Max; Windhorst, Rogier; Blair, William P. +23 more

We present narrow band, continuum subtracted Hα, [S II], Hβ, [O III] and [O II] data taken with the Wide Field Camera 3 on the Hubble Space Telescope in the nearby dwarf starburst galaxy NGC 4214. From these images, we identify seventeen new planetary nebula candidates, and seven supernova remnant candidates. We use the observed emission line lumi…

Dark mammoth trunks in the merging galaxy NGC 1316 and a mechanism of cosmic double helices

Carlqvist, Per

NGC 1316 is a giant, elliptical galaxy containing a complex network of dark, dust features. The morphology of these features has been examined in some detail using a Hubble Space Telescope, Advanced Camera for Surveys image. It is found that most of the features are constituted of long filaments. There also exist a great number of dark structures …