[Shape-univ] INTEGRAL/SPI: first 511keV-photograph of dark matter halo?

[Bartosz Lew]

Czesc,

Is this something new ? The peper is like from one year ago.

>
> Kn\"odlseder et al. (2005) seems to be the main "discovery" article of
> the INTEGRAL/SPI results.
>
> It has some very nice pictures - especially Figs 4, 5 and 7 - here i've
> put the closed links, but the figures are in the astro-ph versions too,
> of course:
>
> Fig 4
> http://www.edpsciences.org/articles/aa/full/2005/38/aa2063-04/img62.gif
>
> Fig 5
> http://www.edpsciences.org/articles/aa/full/2005/38/aa2063-04/img63.gif
>
> Fig 7
> http://www.edpsciences.org/articles/aa/full/2005/38/aa2063-04/img108.gif
>
> We may soon be able to say that Fig.~4 was the "first picture of
> invisible matter" ;).

well, it's a picture of what's left of it:  electrons, positrons 
... and protons, neutrinos, etc.

I didn't have time to read this carefully, but what are the principles of 
the measurment giving hint on variation of fine structure constant ?

>
>
> Ascasibar et al 2005 has some very interesting conclusions - apart from
> the continued validity of LDM as only (so far) viable explanation, they say:
>
>>  One consequence is that the value of the fine structure constant \alpha
>> should differ from that recommended in the CODATA (Committee on Data
>> for Science and Technology). This is a very strong test for the LDM
>> scenario and an additional motivation in favour of experiments
>> measuring \alpha directly. Our results finally indicate that an accurate
>> measurement of the shape of the dark halo profile could have a
>> tremendous impact on the determination of the origin of the 511-keV
>> line and vice versa.
>
> Both of these are very good for showing that evidence should build up either
> for or against the LDM hypothesis. :)
>
> pozdr
> boud
>
>
> Kn\"odlseder et al. (2005)
> http://arXiv.org/abs/astro-ph/0506026
> http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?bibcode=2005A%26A...441..513K&db_key=AST
>
> Ascasibar, Y et al. (2005)
> http://arXiv.org/abs/astro-ph/0507142
> http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?bibcode=2006MNRAS.368.1695A&db_key=AST
>
>
>