PI: Jonathan Davies, Cardiff University, email@example.com
Address: Physics Department, The Parade, Cardiff, Wales CF24 3AA, UK
CoI: Robert Minchin, Arecibo Observatory
CoI: Michael Disney, Cardiff University
CoI: Luca Cortese, Cardiff University
Title: H_(alpha) observations of NGC4254 and its surrounding regions.
Abstract: NGC4254 is a one armed spiral galaxy either in or in-falling into the Virgo cluster. It is linked to a 150 kpc stream of HI with no visible cause. However our 21 cm map of the cluster finds what we infer to be a dynamically massive (10^11 M_\odot) dark disc (VirgoHI21) embedded in that stream, by far the best candidate so far for a totally dark galaxy, which could have generated it. We propose to image in H_(alpha) NGC4254 and its surrounding environment to try and clear up heated arguments about the origin of the stream and the case for the dark galaxy. We will be looking for H_(alpha) streams that will hopefully reveal the perpetrators of the interaction (see for example Kenney et al., 2008).
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