I might want to get back into the stream analysis business again. Variety of angles: it's part of the SFB 881 project; I would like to see how well proper motion cleaning works for finding stellar halo streams traced by giants; a good test case to combine proper motions between PS1 & SDSS.
Possible starting point: the Pisces stream, recently found by Martin et al (http://arxiv.org/pdf/1302.2155v1.pdf). This stream appears to be traced in giants,
at a goodly distance of 35 kpc. I wonder whether one can do both a photometric metallicity "cleaning" of the stream, using ugr [XX will look at the metallicity diagnostic of old giants in the
ugr plane]; and the contaminant MS stars at g-r=0.6 and r<19.5 should be at ~3 kpc, where their
dispersion should be ~>60 km/s, hence detectable by proper motions...
This might lead me to re-open the questio of optimal filtering a la Koposov et al 2010.
Keine Kommentare:
Kommentar veröffentlichen