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Minutes of the talk on:
      The Jodrell Multi-beam Virgo Survey

Jonathan Davies (U. Cardiff)

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The Jodrell Virgo Survey

The Jodrell Virgo survey is part of HIJASS and encompasses 4 X 8 degrees, fully sampled.

  • Actually, it is very difficult, if not impossible, to find isolated HI clouds in the absence of star formation. HIPASS has already shown this to be the case.
  • The centers of clusters like Virgo are well known to be populated by HI deficient objects. This indicates that we should perhaps survey the outskirts of the cluster to look for low mass clouds.

  • In the survey, objects were detected using a combination of by-eye method and automated routine.


    Four new detections were shown along with their comparable HIPASS spectra which are, as expected, much noisier. Weak detections were also confirmed by pointed Jodrell observations.



    Riccardo The redshift distribution is of a region off-center from the cluster so the results may show what is expected just from the increase in the volume sampled behind the cluster
    Jon The targetted field doesn't cover any of the clouds with sysematically higher velocity.
    Martha H. Primary/secondary distances do indicate an elongation into the background for Virgo, along the line of sight.
    Wim vD. Some of us will be back in a few months to use AO to look at LSB galaxies in Virgo.
    Noah B. You should have gone beyond 2500 km/s to look at galaxies in void.
    Jon Yes, that was obvious when we looked at the redshift distribution.
    Noah B. How far can you go?
    Jon 3500-4000 km/s with Jodrell Bank, which we are in the process of doing.
    Peppo G. Are you planning to cover more of the cluster?
    Jon We'd like to, but we have no more time yet.
    Lister You need to know distances to these objects.
    Jon We put all at 16 Mpc.
    Lister But the objects at 2500 km/s must be in the background, right?
    Jon Not according to Binggeli.
    Lister But he's looking in core and this region is off to one side.
    Jon It should be true for the area I'm looking at; he includes different galaxy "clouds".
    Lister Do you have any plan to get redshift independent distances?
    Jon Some of them should have them already.
    Wolfram F. Do the velocity widths suggest that there should be optical counterparts?
    Jon Yes. One is very narrow so I suspect it may be a face on galaxy.
    Steve S. The distribution of velocities is very interesting. You could also look at the distribution of widths to see whether they are likely to be at larger distances.

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    Next: SMUDGES Up: Minutes of the 1st Previous: Pilot Survey

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