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RASJOBS  April 2012

RASJOBS April 2012

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Subject:

Job Advertisement: Closing Date 25th April 2012

From:

RAS Jobs <[log in to unmask]>

Reply-To:

RAS Jobs <[log in to unmask]>

Date:

Thu, 5 Apr 2012 16:39:58 +0100

Content-Type:

TEXT/PLAIN

Parts/Attachments:

Parts/Attachments

TEXT/PLAIN (73 lines)

Job Advertisement: Closing Date 25th April 2012

Interested candidates to pursue a PhD in cosmology are invited to apply 
for a PhD scholarship at the astrophysics department at CEA Saclay, 
France.

Subject: Weak gravitational lensing measurement for cosmology

This PhD will address the most important problem of weak lensing to date: 
The measurement of the shapes of faint, high-redshift galaxies to 
sub-percent precision. This performance is needed for upcoming large 
galaxy surveys, in particular for Euclid. This optical and infrared 
mission will image 15,000 degrees of the extra- galactic sky, to unravel 
the origin of the present accelerated expansion of the Universe. Weak 
lensing is one of the two main science drivers. For Euclid to meet its 
goals, present methods of weak lensing shape measurements have to be 
improved by an order of magnitude. Current methods based on Bayesian model 
fitting or the measurement of moments of the light distribution, have been 
successfully applied to ground-based (CFHTLenS) and space-based 
(HST/COSMOS) observations, yielding accuracies at the one-to-five 
percent-level. For future surveys, this precision has to be increased 
significantly, yielding unbiased estimates of the shapes of a huge number 
of galaxies.

To tackle this problem, the PhD student will work in a multi-disciplinary
environment, involving scientists from cosmology, image processing and
statistics. The work will be carried out within the Euclid weak lensing 
team, of which several members work at CEA Saclay. Various dedicated image
simulations are available, which are used to validate the methods 
developed by the student. Access to data from CFHTLenS is granted, to 
allow for an immediate application of those methods, up to cosmological 
interpretation, to get constraints on dark matter and dark energy. This 
work will help to develop a weak-lensing pipeline for Euclid, to which the 
CEA Saclay is a major participant.

Institute web page: http://irfu.cea.fr/Sap/en/Phocea/Vie_des_labos/Ast/index.php

Contact:
Dr. Martin Kilbinger
Email: [log in to unmask]
Tel.:  +33 1 69 08 17 53

The CEA Saclay is located 15 km south-west of Paris. The astrophysics
department (SAp) at CEA is one of the major astronomy research centres in
Europe. It consists of about 200 people, and covers many research areas 
such as cosmology, galaxy evolution, high-energy physics, numerical 
simulations, statistics, star and planet formation, nuclear astrophysics, 
and instrumentation.

The PhD work will be carried out in collaboration with Yannick Mellier at 
the Institute of Astrophysics (IAP) in downtown Paris.

Applicants are asked to send a motivation letter, a CV, two reference
letters and their University certificates to [log in to unmask] before
April 25, 2012. Please don't hesitate to send further inquiries to the
same email address.

The CEA offers a limited number of scholarships each year. The supervisor 
for each subject can support one candidate. The decision which PhDs are 
financed will be made in June 2012, based on the excellence of the 
candidate's dossier.

PhD positions at CEA will be offered for three years, starting from
autumn 2012. The salaries are very competitive, with a minimum of 1450 
Euros per month. Travel money to participate in schools and conferences 
will be provided in addition.

----------------------------------------------------------------------------------

The Royal Astronomical Society Job List is provided free-of-charge through the JISC Mail Service. Although every effort is made to ensure accuracy, the RAS cannot accept responsibility for the accuracy or validity, either directly or by implication, of job advertisements or other information posted to this list. For more information about the Royal Astronomical Society visit the website at www.ras.org.uk.

Royal Astronomical Society, Burlington House, Piccadilly, London W1J 0BQ, UK, tel. +44 (0)20 7734 3308, fax. +44 (0)20 7494 0166, www.ras.org.uk

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