Subject: Keck data and ps file with old diagrams
Date: Thu, 19 Mar 1998 19:05:22 GMT
From: Montse Villar-Martin <M.Villar-Martin@sheffield.ac.uk>
To: rfosbury@eso.org

        Dear Bob, how are you doing?

        I'm sorry about this silence. The reason is that these last weeks
I have been busy with many things that I need to finish before the end of
the month. I am  starting to work on the application for SOFI time at
the NTT. If I have enough time, I'll send you the proposal before submission
and you could let me know whether you are interested on being involved
and whether you have comments on it.

        I  have had not much time for the Keck data on hzrg.
After NAM (first week of April) I'll have more time and the keck data will
 be one of my priorities again, so that I can bring to Florence the main
results from the line fluxes.

        I have advanced a bit, however. I have done two things:

        1) re-do the same diagnostic diagrams with the UV lines, but
with the new data you sent me in one of your last e-mails.  Altough
the positions  of the objects vary a bit, the main conclusions remain.
I send to you  this new ps (colour!) file. As before,

        - blue squares --> Keck data.
        - black solid line --> PL index -1.0
        - red lines --> pure shock models
        - green lines --> shock+precursor

        2) Study (not with enough depth!) the diagrams involving NV and CII.
If you remember, our objects occupy a region in the diagnostic diagrams
involving CIV, CIII and HeII where shock  and PL models overlap: therefore, the
  discrimination is difficult (I will forget now the fact that AGN models
explain better the general trend defined by all HzRG).

        I have investigated whether CII and NV provide an unambiguous
diagnosis for shocks vs. AGN photoioniation. I have build some diagrams,
but the problem is that I don't have the AGN photionization models. I need
to run models again and I will not be able until April.

        The conclusion of my study so far is that shock and mainly
shock+precursor models can explain nicely the ratios involving CII and NV #
(see the second
ps file). It will be crucial to plot the PL models and see whether they overlap
or they are unable to explain the CII and NV line ratios. We will then know

        a) whether PL can also explain the line ratios and therefore the
diagnostics is still not possible

        b) whether Pl models fail to explain the line ratios

        I know that this work is not concluded. However, as I will
have not time to work on this until the second week of April,
I thought that you might be interested to know about the advances on
the diagnostics AGN vs. shocks.

        It would be very useful   if I could have the real data. I could
try to use the spatial information and plot line ratios at different
positions. This can be very useful both for the question of the
geometrical effects and the  ionization mechanims.

        This would also allow me to work  start working on the kinematics
of the lines and see whether we observe in these distant objects the same
signature of jet-cloud interactions that we observe in nearby jet-cloud
interaction radio galaxies, where we detect several componentes with
different physical  and kinematic properties.

        Well, I'll stop here... I hope that everything is going well for
you.

        All the best

        Montse

PS:     The papers for the Dorothy Hodgkin application arrived on time
in London. I sent them just the day before the dealine! They will send
the results on July.

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   hzrg_new.ps   Name: hzrg_new.ps
                 Type: application/postscript