On the filamentary environment of galaxies (2009)
Gay, C., Pichon, C., Borgne, D. Le, Teyssier, R., Sousbie, T., Devriendt, J.
The correlation between the large-scale distribution of galaxies and their spectroscopic properties is investigated using the Horizon MareNostrum cosmological run. We have extracted a large sample of...
ASKI: towards a full-sky lensing map making pipeline (2009)
Pichon, C., Thiebaut, E., Prunet, S., Benabed, K., Colombi, S., Sousbie, T., ...
Within the context of upcoming full-sky lensing surveys, the edge-preserving non- linear algorithm Aski is presented. Using the framework of Maximum A Posteriori inversion, it recovers the full-sky...
Cold streams in early massive hot haloes as the main mode of galaxy formation (2009)
Dekel, A., Birnboim, Y., Engel, G., Freundlich, J., Goerdt, T., Mumcuoglu, M., ...
Phase-space structures – I. A comparison of 6D density estimators (2009)
Maciejewski, M., Colombi, S., Alard, C., Bouchet, F., Pichon, C.
The Local Theory of the Cosmic Skeleton (2008)
Pogosyan, D., Pichon, C., Gay, C., Prunet, S., Cardoso, J. F., Sousbie, T., ...
The local theory of the critical lines of 2D and 3D Gaussian fields that underline the cosmic structures is presented. In the context of cosmological matter distribution the subset of critical lines...
Phase-space structures I: A comparison of 6D density estimators (2008)
Maciejewski, M., Colombi, S., Alard, C., Bouchet, F., Pichon, C.
This paper reviews and analyses methods used to identify neighbours in 6D space and estimate the corresponding phase-space density. It compares SPH methods to 6D Delaunay tessellation on statical and...
The fully connected N-dimensional skeleton: probing the evolution of the cosmic web (2008)
Sousbie, T., Colombi, S., Pichon, C.
A method to compute the full hierarchy of the critical subsets of a density field is presented. It is based on a watershed technique and uses a probability propagation scheme to improve the quality...
Cold streams in early massive hot haloes as the main mode of galaxy formation (2008)
Dekel, A., Birnboim, Y., Engel, G., Freundlich, J., Goerdt, T., Mumcuoglu, M., ...
The massive galaxies in the young universe, ten billion years ago, formed stars at surprising intensities. Although this is commonly attributed to violent mergers, the properties of many of these...
Initial Conditions for Large Cosmological Simulations (2008)
Prunet, S., Pichon, C., Aubert, D., Pogosyan, D., Teyssier, R., Gottloeber, S.
This technical paper describes a software package that was designed to produce initial conditions for large cosmological simulations in the context of the Horizon collaboration. These tools...
Bimodal gas accretion in the Horizon-MareNostrum galaxy formation simulation (2008)
Ocvirk, P., Pichon, C., Teyssier, R.
(abridged) The physics of diffuse gas accretion and the properties of the cold and hot modes of accretion onto proto-galaxies between z=2 and z=5.4 is investigated using the large cosmological...
Recovering the topology of the IGM at z~2 (2008)
Caucci, S., Colombi, S., Pichon, C., Rollinde, E., Petitjean, P., Sousbie, T.
We investigate how well the 3D density field of neutral hydrogen in the Intergalactic Medium (IGM) can be reconstructed using the Lyman-alpha absorptions observed along lines of sight to quasars...
The three dimensional skeleton: tracing the filamentary structure of the universe (2007)
Sousbie, T., Pichon, C., Colombi, S., Novikov, D., Pogosyan, D.
The skeleton formalism aims at extracting and quantifying the filamentary structure of the universe is generalized to 3D density fields; a numerical method for computating a local approximation of...
R. Massard, D. Uzio, C. Thomazeau, C. Pichon, J.C. Bertolini, ...
Journal article
R. Massard, D. Uzio, C. Thomazeau, C. Pichon, J.C. Bertolini, ...
Journal article
XAS study at mo and co K-Edges of the sulfidation of a CoMo A1(2)O(3) hydrotreating catalyst (2007)
C. Pichon, A.D. Gandubert, C. Legens, D. Guillaume
Contribution to a conf. proceeding (book/online)
Lattice Melting and Rotation in Perpetually Pulsating Equilibria (2006)
Pichon, C., Lynden-Bell, D., Pichon, J., Lynden-Bell, R.
Systems whose potential energies consists of pieces that scale as r^-2 together with pieces that scale as r^2, show no violent relaxation to Virial equilibrium but may pulsate at considerable...
Coppolani, F., Petitjean, P., Stoehr, F., Rollinde, E., Pichon, C., Colombi, S., ...
We present the transverse flux correlation function of the Lyman-alpha forest in quasar absorption spectra at z~2.1 from VLT-FORS and VLT-UVES observations of a total of 32 pairs of quasars; 26 pairs...
M. Benkhaled, S. Morin, C. Pichon, C. Thomazeau, C. Verdon, ...
Journal article
The correlation of the Lyman-alpha forest and metals in close pairs of hight-redshift quasars (2005)
Coppolani, F., Petitjean, P., Stoehr, F., Rollinde, E., Pichon, C., Colombi, S., ...
We derive the transverse flux correlation function in the Lyman-alpha forest at z~2.1 from VLT-FORS observations of a total of 32 pairs of quasars. The shape and correlation length of the transverse...
The XMM-Newton $\\Omega$ Project (2005)
Bartlett, J. G., Aghanim, N., Arnaud, M., Bernard, J. -Ph., Blanchard, A., Boer, M., ...
The abundance of high-redshift galaxy clusters depends sensitively on the matter density $\\OmM$ and, to a lesser extent, on the cosmological constant $\\Lambda$. Measurements of this abundance...
STEllar Content and Kinematics from high resolution galactic spectra via Maximum A Posteriori (2005)
Ocvirk, P., Pichon, C., Lancon, A., Thiebaut, E.
We introduce STECKMAP (STEllar Content and Kinematics via Maximum A Posteriori), a method to recover the kinematical properties of a galaxy simultaneously with its stellar content from integrated...
Durret, F., Gerbal, D., Lobo, C., Pichon, C.
This paper is the fourth of a series dealing with the cluster of galaxies ABCG 85. Using our two extensive photometric and spectroscopic catalogues (with 4232 and 551 galaxies respectively), we...
Stellar Content from high resolution galactic spectra via Maximum A Posteriori (2005)
Ocvirk, P., Pichon, C., Lancon, A., Thiebaut, E.
This paper describes STECMAP (STEllar Content via Maximum A Posteriori), a flexible, non-parametric inversion method for the interpretation of the integrated light spectra of galaxies, based on...
Mazoyer, P., Geantet, C., Diehl, F., Pichon, C., Nguyen, T. S., Lacroix, M.
An industrial alumina-supported CoMoP catalyst was impregnated (incipient wetness method) with an aq. soln. of diethyleneglycolbutylether (DEGbe) and then dried at 393 K overnight. After sulfidation...
Pichon, C., Chevarier, A., Gardon, A., Millard-Pinard, N., ...
This paper presents a fundamental study of the radiolysis of gaseous organic molecules induced by proton beam. For that purpose, a specific extracted beam line associated with a gas irradiation cell...
Pichon, C., Chevarier, A., Gardon, A., Millard-Pinard, N., ...
This paper presents a fundamental study of the radiolysis of gaseous organic molecules induced by proton beam. For that purpose, a specific extracted beam line associated with a gas irradiation cell...
Pichon, C., Chevarier, A., Gardon, A., Millard-Pinard, N., ...
This paper presents a fundamental study of the radiolysis of gaseous organic molecules induced by proton beam. For that purpose, a specific extracted beam line associated with a gas irradiation cell...
Pichon, C., Chevarier, A., Gardon, A., Millard-Pinard, N., ...
This paper presents a fundamental study of the radiolysis of gaseous organic molecules induced by proton beam. For that purpose, a specific extracted beam line associated with a gas irradiation cell...
Pichon, C., Chevarier, A., Gardon, A., Millard-Pinard, N., ...
This paper presents a fundamental study of the radiolysis of gaseous organic molecules induced by proton beam. For that purpose, a specific extracted beam line associated with a gas irradiation cell...
P. Mazoyer, C. Geantet, F. Diehl, C. Pichon, T.S. Nguyen, ...
Journal article
Structure and size of bimetallic palladium - Platinum clusters in an hydrotreatment catalyst (2005)
D. Bazin, D. Guillaume, C. Pichon, D. Uzio, S. Lopez
Journal article
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pas de résumé
J.S. Choi, F. Mauge, C. Pichon, J. Olivier-Fourcade, J.C. Jumas, ...
Journal article
Ocvirk, P., Pichon, C., Lancon, A.
We present inversion techniques aiming at recovering the stellar content (age, metallicity, extinction) and kinematics of a stellar population from its absorption line spectrum. These techniques use...
Rollinde, E., Petitjean, P., Pichon, C., Colombi, S., Aracil, B., D'Odorico, V., ...
We study the clustering of matter in the intergalactic medium from the Lyman-alpha forests seen in the spectra of pairs or groups of z ~ 2 quasars observed with FORS2 and UVES at the VLT-UT2 Kueyen...
On the kinematic deconvolution of the local neighbourhood luminosity function (2001)
Pichon, C., Bienayme, A. Siebert O.
A method for inverting the statistical star counts equation, including proper motions, is presented; in order to break the degeneracy in that equation it uses the supplementary constraints required...
Rollinde, E., Petitjean, P., Pichon, C.
We study the physical properties of the Lyman-alpha forest by applying the inversion method described by Pichon et al. (2001) to the high resolution and high S/N ratio spectrum of the z_em=2.40...
The XMM-Newton $\Omega$ Project (2001)
Bartlett, J. G., Aghanim, N., Arnaud, M., Bernard, J. -Ph., Blanchard, A., Boer, M., ...
The abundance of high-redshift galaxy clusters depends sensitively on the matter density $\OmM$ and, to a lesser extent, on the cosmological constant $\Lambda$. Measurements of this abundance...
Inversion of the Lyman-$\alpha$ forest: 3D investigation of the intergalactic medium (2001)
Pichon, C., Vergely, J. L., Rollinde, E., Colombi, S., Petitjean, P.
We discuss the implementation of Bayesian inversion methods in order to recover the properties of the intergalactic medium from observations of the neutral hydrogen Lyman-$\alpha$ absorptions...
The XMM-Newton $\\Omega$ Project (2001)
Bartlett, J. G., Aghanim, N., Arnaud, M., Bernard, J. -Ph., Blanchard, A., Boer, M., ...
The abundance of high-redshift galaxy clusters depends sensitively on the matter density $\\OmM$ and, to a lesser extent, on the cosmological constant $\\Lambda$. Measurements of this abundance...
The XMM-Newton $\\Omega$ Project (2001)
Bartlett, J. G., Aghanim, N., Arnaud, M., Bernard, J. -Ph., Blanchard, A., Boer, M., ...
The abundance of high-redshift galaxy clusters depends sensitively on the matter density $\\OmM$ and, to a lesser extent, on the cosmological constant $\\Lambda$. Measurements of this abundance...
Stellar Dynamics in the Galactic centre: Proper Motions and Anisotropy (2000)
Genzel, R., Pichon, C., Eckart, A., Gerhard, O. E., Ott, T.
We report a new analysis of stellar dynamics in the Galactic centre, based on improved sky and LOS velocities for >100 stars within a few arcsec of SgrA*. Overall the motions do not deviate strongly...
Vorticity generation in large-scale structure caustics (1999)
A fundamental hypothesis for the interpretation of the measured large-scale line-of-sight peculiar velocities of galaxies is that the large-scale cosmic flows are irrotational. In order to assess the...
Durret, F., Gerbal, D., Lobo, C., Pichon, C.
This paper is the fourth of a series dealing with the cluster of galaxies ABCG 85. Using our two extensive photometric and spectroscopic catalogues (with 4232 and 551 galaxies respectively), we...
Non parametric reconstruction of distribution functions from observed galactic disks (1998)
A general inversion technique for the recovery of the underlying distribution function for observed galactic disks is presented and illustrated. Under the assumption that these disks are...
Durret, F., Gerbal, D., Lobo, C., Pichon, C.
This paper is the fourth of a series dealing with the cluster of galaxies ABCG 85. Using our two extensive photometric and spectroscopic catalogues (with 4232 and 551 galaxies respectively), we...
Durret, F., Gerbal, D., Lobo, C., Pichon, C.
This paper is the fourth of a series dealing with the cluster of galaxies ABCG 85. Using our two extensive photometric and spectroscopic catalogues (with 4232 and 551 galaxies respectively), we...
Crézé, M., Chereul, E., Bienaymé, O., Pichon, C.
Hipparcos data provide the first, volume limited and absolute magnitude limited homogeneous tracer of stellar density and velocity distributions in the solar neighbourhood. The density of A-type...
Comment on the dispersion-velocity of galactic dark matter particles (1997)
In a recent Letter, Cowsik, Ratnam and Bhattacharjee (1996a) have built a dynamically self-consistent spatial distribution of particles of galactic dark matter. They have come up with the rather...
Numerical linear stability analysis of round galactic disks (1997)
The method originally developed by Kalnajs for the numerical linear stability analysis of round galactic disks is implemented in the regimes of non-analytic transformations between position space and...
Equilibria of flat and round galactic disks (1996)
A general method is presented for constructing distribution functions for flat systems whose surface density and Toomre's Q number profile is given. The purpose of these functions is to provide...
New sources for Kerr and other metrics: rotating relativistic disks with pressure support (1996)
Complete sequences of new analytic solutions of Einstein's equations which describe thin super massive disks are constructed. These solutions are derived geometrically. The identification of points...
Two-subunit structure of the human thyrotropin receptor.
Loosfelt, H, Pichon, C, Jolivet, A, Misrahi, M, Caillou, B, Jamous, M, ...
The extracellular and intracellular domains of the human thyrotropin receptor were expressed in Escherichia coli and the proteins were used to produce monoclonal anti-receptor antibodies. Immunoblot...
Two-subunit structure of the human thyrotropin receptor.
Loosfelt, H, Pichon, C, Jolivet, A, Misrahi, M, Caillou, B, Jamous, M, ...
The extracellular and intracellular domains of the human thyrotropin receptor were expressed in Escherichia coli and the proteins were used to produce monoclonal anti-receptor antibodies. Immunoblot...
B. Guichard, M. Roy-Auberger, E. Devers, C. Pichon, ...
Talk
B. Guichard, M. Roy-Auberger, E. Devers, C. Pichon, ...
Poster
Chereul Bienaym'e Pichon, C. Pichon
Hipparcos data provide the first, volume limited and absolute magnitude limited homogeneous tracer of stellar density and velocity distributions in the solar neighbourhood. The density of A-type...
H. Loboue H, C. Guillot-Deudon, A.F. Popa, A. Lafond, ...
Conference presentation