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Testing Lorentz invariance of dark matter with satellite galaxies

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Gas dynamics in tidal dwarf galaxies: Disc formation at z=0

Yves Revaz

Tidal dwarf galaxies (TDGs) are recycled objects that form within the collisional debris of interacting and merging galaxies. They are expected to be devoid of non-baryonic dark matter, since they can only form from dissipative material ejected from the di ...

Edp Sciences S A2015

The Smith Cloud and its dark matter halo: survival of a Galactic disc passage

Matthew Luke Nichols

Under conservative assumptions about the Galaxy, the derived velocity of the Smith Cloud indicates that it will have undergone at least one passage of the Galactic disc. Using hydrodynamic simulations, we examine the present-day structure of the Smith Clou ...

Wiley-Blackwell2014

Unidentified Line in X-Ray Spectra of the Andromeda Galaxy and Perseus Galaxy Cluster

Alexey Boyarsky, Oleg Ruchayskiy

We report a weak line at 3.52 +/- 0.02 keV in x-ray spectra of the Andromeda galaxy and the Perseus galaxy cluster observed by the metal-oxide-silicon (MOS) and p-n (PN) CCD cameras of the XMM-Newton telescope. This line is not known as an atomic line in t ...

Amer Physical Soc2014

Potential of the Large Observatory for X-ray Timing telescope for the search for dark matter

Alexey Boyarsky, Oleg Ruchayskiy

Large observatory for x-ray timing (LOFT) is a concept of a next-generation x-ray telescope considered in the context of the "Cosmic Vision" program of the European Space Agency. The Large Area Detector on board of LOFT will be a collimator-type telescope ...

Amer Physical Soc2014

Planck 2013 results. VIII. HFI photometric calibration and mapmaking

Xin Chen, Julien Lesgourgues, Fabio Finelli

This paper describes the methods used to produce photometrically calibrated maps from the Planck High Frequency Instrument (HFI) cleaned, time-ordered information. HFI observes the sky over a broad range of frequencies, from 100 to 857 GHz. To obtain the b ...

Edp Sciences S A2014

Cold gas in the inner regions of intermediate redshift clusters

Pascale Jablonka

Determining the nature and modes of star formation at galactic scales requires an understanding of the relationship between the gas content of a galaxy and its star formation rate. Remarkable progress has been made in understanding the conversion mechanism ...

Edp Sciences S A2013

Polar ring galaxies as tests of gravity

Polar ring galaxies are ideal objects with which to study the three-dimensional shapes of galactic gravitational potentials since two rotation curves can be measured in two perpendicular planes. Observational studies have uncovered systematically larger ro ...

Oxford Univ Press2013

GEAR: A Window on the World of Dwarf Galaxies

Pascale Jablonka, Yves Revaz

GEAR is a new fully parallel chemodynamical Tree/SPH code designed to study the formation and evolution of galaxies. GEAR treats the complex physics of baryons, such as radiative cooling and feedback, star formation, and chemical evolution. It has been ful ...

Astronomical Soc Pacific2012

The haloes of bright satellite galaxies in a warm dark matter universe

Alexey Boyarsky, Oleg Ruchayskiy, Jie Wang

High-resolution N-body simulations of galactic cold dark matter haloes indicate that we should expect to find a few satellite galaxies around the Milky Way whose haloes have a maximum circular velocity in excess of 40 km s-1. Yet, with the exception of the ...

Blackwell Publishing Ltd, Oxford2012

A fast empirical method for galaxy shape measurements in weak lensing surveys

Frédéric Courbin, Georges Meylan, Malte Tewes, Nicolas Cantale

We describe a simple and fast method to correct ellipticity measurements of galaxies from the distortion by the instrumental and atmospheric point spread function (PSF), in view of weak lensing shear measurements. The method performs a classification of ga ...

Edp Sciences S A2012