How long is that tidal trail

by Budgieye moderator
http://talk.spacewarps.org/#/subjects/ASW0008db1/science/discussions/new
what could cause such a long star stream? What is it a few tens of thousands of light years?
The image is 60arcsec. so half of that 30 arcsec
Estimate distance to galaxy, well, no hint of yellowing so say z=0.01, or 138,000,000 lightyears away, using Wolfram
Redshft conversion website
http://www.wolframalpha.com/input/?i=redshift&a=Find a nice website http://chandra.harvard.edu/photo/scale_distance.html, use example 3. Plug in numbers
0.019871 million lightyearslong or 19,871 lightyears, so your estimate of a few tens of thousands is quite good.
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