[IPTA Clock] clock data set v1.0

[Rutger van Haasteren]

Hi George,

Are we not eventually going to use the IPTA combined data release? I
thought that dataset, which is already being put together by Joris et al as
a formal IPTA project, is meant specifically for IPTA purposes like the
IPTA clock project...

But kudo's for sending this data around: this is more than is available on
the IPTA wiki (Joris' data release 'A' only contains 13 pulsars).

Cheers,

Rutger



On Tue, Jan 15, 2013 at 7:17 AM, <George.Hobbs at csiro.au> wrote:

> Hi all,
>
>  I've had a first go a making an IPTA data set for use as part of the
> clock project.  The data set is attached to this email as ipta_v1.tar.gz.
>  I have included all 28 pulsars in the IPTA sample.  This is very much an
> initial data set and:
>
> 1. doesn't include EFACs/EQUADs etc.
> 2. doesn't include any DM correction
> 3. doesn't include any sub-channel offsets
>
> However,
> 1. all pulsars are referred to TT(BIPM2011) and DE421
> 2. all pulsar names are J names
> 3. removed the use of ecliptic coordinates (probably not a good idea)
> 4. everything is in tempo2 format
> 5. all the arrival times are in one file that can be time sorted (i.e.,
> TIME commands have been removed and replaced with flags)
> 6. weighting is turned on
>
> Mike and I have also ensured that the tempo2 clock files are up-to-date in
> CVS (this has included updating TT(BIPM2011))
>
> This is an initial data set.  The final data set will be significantly
> different (the DM correction will make a huge difference), but the number
> of pulsars, data spans, number of points, frequencies etc. are likely to
> remain basically the same.  Therefore, the point of sending out this data
> set is for people to dust of their algorithms and ensure that their version
> of tempo2 is up-to-date etc.
>
> I attach four figures that give a basic summary of the data.  The first (
> ipta.ps) shows the data sampling for the IPTA pulsars.  The different
> colours indicate different observing frequencies:
>
> black (f < 500MHz)
> red (f < 700MHz)
> green (f < 1000 MHz)
> dark blue (f < 1500 MHz)
> light blue (f < 2000 MHz)
> pink (f < 4000 MHz)
> yellow (f > 4000 MHz)
>
> The second plot (nano.ps) is the same, but just for the NANOGrav data and
> epta.ps and ppta.ps are the same for those PTAs.
>
> So, please have a play with the data sets and please let me know if you
> find any major issues.  My intention is:
>
> ipta_v1.0 -- the data set attached to this email
> ipta_v1.1 -- include DM correction
> ipta_v1.2 -- include EFAC/EQUADs
> ipta_v1.3 -- include high quality .par file and Cholesky models
>
> Around version 1.2, I'll also work with Mike to produce the simulated data
> sets that have the same properties as the known data, but also has a known
> clock signal.
>
> Finally this email distribution list has lots of PPTA and EPTA members,
> but very few NANOgrav members.  Rossina/Demetrios, do you think that we
> should try and get some more NANOGrav members involved?  If so, how?
>
> Cheers,
>  George
>
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>
> George Hobbs
> Research Scientist
> Astronomy and Space Science
> CSIRO
>
> Phone: +61 2 9372 4652
> george.hobbs at csiro.au<mailto:george.hobbs at csiro.au> | www.csiro.au<
> http://www.csiro.au/>
> Address: PO Box 76, Epping NSW 1710
> Australia (Cnr Vimiera & Pembroke Roads, Marsfield NSW, 2122)
>
>
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>
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>
>


-- 

______________________________________________________________________
 dr. Rutger van Haasteren, post-doctoral researcher Astrophysics
 Max Planck Institute for gravitational physics (Albert Einstein Institute)
 Hannover, Germany
 E-mail: vhaasteren at gmail.com
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