Disk Detective Talk

The distance of the Galaxy 2dFGRS TGS261Z012

  • Haian by Haian

    We have a Galaxy with radial velocity = 12155 V(km/s) and Redshift = 0.0414 . So the question is What is the galaxy distance? My answer is by using Hubble law and by taking into account that the recent estimation of Hubble constant is 67.80±0.77 according to Planck Mission 2013-03-21, the distance will be about 179.278 Mpc. so it is far galaxy. What do you thing?

    Posted

  • TED91 by TED91 moderator

    Not bad, you got it almost

    cdist: 119.6590 Mpc

    http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ53bfc78c52fe&-out.add=.&-source=J/AN/327/365/grGal&recno=64036

    Posted

  • Haian by Haian

    Thank you TED91. Your notice is very powerful.
    I think that my result is larger than 119.6590 Mpc because I didn't take into consideration the expansion of the universe during the trip and that our object has long distance (according to the general relativity). I calculated it as Non-comoving observer because I saw the object red-shifted.

    Posted