Measure radial velocity of nearby galaxies

[Christian Buil]

During the OHP 2013 course, a quick expriment about the measure of nearby galaxies radial velocity (M31, M33, NGC 7331à) with Alpy and a 200-mm telescope
(a possible student project). See details here:

http://www.astrosurf.com/buil/redshift/demo.htm

Example, the central part of Messier 31 galaxy (Alpy guiding Atik314L camera):



and the corresponding 2D spectrum:



Another example for M33. The target is here a extragalactic nebula (NGC604):



The nebula spectrum for evaluate radial veolocity;



Christian

[Robin Leadbeater]

Hello Christian,

I found this reference for NGC 604
http://cdsads.u-strasbg.fr/cgi-bin/nph- ... .130...29R
which gives the mean RV of NGC 604 as -240km/s, compared with the published figure of -182km/s for M33. This makes your measurement slightly closer and still within the +-50km/s uncertainty.

Cheers
Robin

[Christian Buil]

Hello Robin

Thanks for this important info about NGC 604 RV (different from M33 mean velocity). I have added a line of these reference in my page.

Christian