The XMM Large
Scale Structure Survey
Over the last two decades
there has been tremendous growth in efforts to systematically map the matter
distribution in the universe. This has been motivated by questions which are
fundamental to cosmology. Firstly, how much matter is there; secondly, what
form does it take; and thirdly, how is it distributed?
advantage of the unrivaled sensitivity of the X-ray Multi mirror observatory
(XMM-Newton), we have designed an XMM wide area survey with the aim of tracing the
large scale structure (LSS) of the universe out to a redshift of z~1 as traced
by clusters and quasars : the XMM-LSS Survey. The survey consists of
adjacent 10 ks MM
separated by 20'. It will ultimately cover a region of 8x8 sq.deg. to a mean
sensitivity of about 5 10-15 erg/s/cm2 for point sources in the [0.5-2] keV
band (with a deeper central 2 sq.deg. area). This makes the XMM-LSS some 1 000
times more sensitive than previous surveys and the only wide area X-ray deep
survey for the
decade. The X-ray survey is coupled with an extensive follow-up programme
of radio, optical and IR observations. As a result we will be able to
identify clusters with unprecedented efficiency and reliability. In addition,
our multi-wavelength observations of the XMM-LSS sources (clusters and quasars)
will form the basis of a uniquely comprehensive study of the evolution of the
structure of the universe from hundreds of Mpc down to galaxy scales. For the
first time, it will be possible to map and study the
of hot gas, luminous galaxies, and obscured or dark material in a coherent way.
We will compare the results of our observations with the predictions of various
cosmological scenarios using extensive numerical simulations generated as part
scope of the project has motivated the set-up of a large consortium in order to
carry out both the data reduction/management and the scientific analysis of the
survey. The XMM-LSS Consortium comprises the following institutes: Saclay
(Principal Investigator), Birmingham, Bristol, Copenhagen, Dublin,
ESO/Santiago, Leiden, Liège,
(LAM), Milan (AOB), Milan (IFCTR), Munich (MPA), Munich (MPE), Paris (IAP),
Santiago (PUC) as well as two US Scientists, S. Snowden (NASA/GSFC) and G.
Bryan (MIT). The XMM-LSS team has also a well defined collaboration with the
team carrying out the SIRTF Wide-area InfraRed Extragalactic Survey (PI, C.
8, 9 and
10 January 2002 the consortium that is carrying out the XMM-LSS survey will meet at the Lorentz Center.
of the meeting is as follows. After a short presentation of the XMM
status and standard data analysis/delivery, the first results from the XMM
survey will be discussed. Further items on the agenda include: (i) the
status of the observing and funding proposals
since last meeting, (ii) activities of the Working Groups and of the general
organization (iii) planning of further XMM, optical and radio observation, (iv)
collaboration with SIRTF survey SWIRE.
meetings of the various working groups (X-ray analysis, Catalogue,