Clusters of galaxies are the most recently assembled, massive, bound structures in the Universe. ... more Clusters of galaxies are the most recently assembled, massive, bound structures in the Universe. As predicted by General Relativity, given their masses, clusters strongly deform space-time in their vicinity. Clusters act as some of the most powerful gravitational lenses in the Universe. Light rays traversing through clusters from distant sources are hence deflected, and the resulting images of these distant objects therefore appear distorted and magnified. Lensing by clusters occurs in two regimes, each with unique observational ...
We have obtained Plateau de Bure Interferometer observations of HLSJ091828.6+514223 (z=5.24) at s... more We have obtained Plateau de Bure Interferometer observations of HLSJ091828.6+514223 (z=5.24) at six different frequencies to cover the CO(6-5), CO(7-6), CI, H_20_{p}(2,0,2-1,1,1), [NII] and [CII] lines. The high resolution and high sensitivity of these multi-configuration observations allow us to detect the various line velocity components as well as the continuum and to resolve spatially their emission. This wealth of information is used to tackle the problem of lens and source modeling. A methodology is implemented to produce image plane maps, optimize the lens model, and finally inverse the PdBI data in the source plane. The image plane and source plane maps are constructed by fitting directly the pixels to the PdBI visibilities with the non-negative least square method. The preliminary results thus obtained are presented.
Received too late, Accepted even later Abstract. We present the catalogue of a wide-field CFHT/WH... more Received too late, Accepted even later Abstract. We present the catalogue of a wide-field CFHT/WHT spectroscopic survey of the lensing cluster Cl0024+1654 at z = 0.395. This catalogue contains 618 new spectra, of which 581 have identified redshifts. Adding redshifts available from the literature, the final catalogue contains data for 687 objects with redshifts identified for 650 of them. 295
Abstract:[Abridged] Observations of molecular gas at all redshifts are critical for measuring the... more Abstract:[Abridged] Observations of molecular gas at all redshifts are critical for measuring the cosmic evolution in molecular gas density and understanding the star-formation history of the Universe. The 12CO molecule (J= 1-0 transition= 115.27 GHz) is the best proxy for extragalactic H2, which is the gas reservoir from which star formation occurs, and has been detected out to z~ 6.
ABSTRACT The impact of environment on active galactic nucleus (AGN) activity up to z~ 1 is assess... more ABSTRACT The impact of environment on active galactic nucleus (AGN) activity up to z~ 1 is assessed by utilizing a mass-selected sample of galaxies from the 10k catalog of the zCOSMOS spectroscopic redshift survey. We identify 147 AGN by their X-ray emission as detected by XMM-Newton from a parent sample of 7234 galaxies.
Abstract. We describe the fundamentals of vanilla and exotic microlensing. Deviations from the st... more Abstract. We describe the fundamentals of vanilla and exotic microlensing. Deviations from the standard form of an achromatic, time-symmetric lightcurve can be caused by the parallax and xallarap effects, finite source sized effects and binarity.
Abstract We present BAX, Base de Données Amas de Galaxies X (http://bax. ast. obs-mip. fr), a mul... more Abstract We present BAX, Base de Données Amas de Galaxies X (http://bax. ast. obs-mip. fr), a multi-wavelength database dedicated to X-ray clusters and groups of galaxies allowing detailed information retrieval.
Page 1. Lensing, Dynamics and X-ray of Clusters of Galaxies Jean-Paul KNEIB Laboratoire d'Astroph... more Page 1. Lensing, Dynamics and X-ray of Clusters of Galaxies Jean-Paul KNEIB Laboratoire d'Astrophysique de Marseille, France H. Ebeling, G. Smith, I. Smail, A. Edge, P. Hudelot, S. Bardeau, M. Limousin, P., G. Soucail, P. Marshall, G. Covone, E.Jullo, , the COSMOS lensing team, and many others Page 2. October 5, 2006 UCSB-KITP 2 Outline ❖Strong & Weak Lensing ❖Lensing in massive X-ray clusters ❖Cluster/groups in COSMOS ❖Future prospects A B C [OII] @ Z=1.55 MACSJ1149.5+2233 Page 3.
ABSTRACT We present extensive observations of a sample of distant, submillimetre (submm) galaxies... more ABSTRACT We present extensive observations of a sample of distant, submillimetre (submm) galaxies detected in the field of the massive cluster lens Abell 1835, using the Submm Common-User Bolometer Array (SCUBA). Taken in conjunction with earlier observations of other submmselected sources, we now have detailed, multiwavelength observations of seven examples of the submm population, having exploited the combination of achromatic amplification by cluster lenses and lavish archival data sets.
Abstract: Gravitational lensing has now become a popular tool to measure the mass distribution of... more Abstract: Gravitational lensing has now become a popular tool to measure the mass distribution of structures in the Universe on various scales. Here we focus on the study of galaxy's scale dark matter halos with galaxy-galaxy lensing techniques: observing the shapes of distant background galaxies which have been lensed by foreground galaxies allows us to map the mass distribution of the foreground galaxies.
Abstract: We summarize the main results obtained recently by our group on the identification and ... more Abstract: We summarize the main results obtained recently by our group on the identification and study of very high-z galaxies (z> 7) using lensing clusters as natural gravitational telescopes. A description of our pilot survey with ISAAC/VLT is presented, aimed at the spectroscopic confirmation of z> 7 candidate galaxies photometrically selected from deep near-IR, HST and optical ground-based imaging.
Abstract: We report the detection of az~ 7 galaxy strongly lensed by the massive galaxy cluster A... more Abstract: We report the detection of az~ 7 galaxy strongly lensed by the massive galaxy cluster Abell 2218 (z= 0.175) at 3.6 and 4.5 um using the Spitzer Observatory and at 1.1 um using the Hubble Space Telescope. The new data indicate a refined photometric redshift in the range of 6.6-6.8 depending on the presence of Ly-alpha emission.
Abstract: We present the X-ray energy spectrum of the lensed BAL QSO H1413+ 117 (the Cloverleaf) ... more Abstract: We present the X-ray energy spectrum of the lensed BAL QSO H1413+ 117 (the Cloverleaf) at z= 2.56 observed with the Chandra X-ray observatory. We detected 293 photons in a 40 ks Advanced CCD Imaging Spectrometer (ACIS-S) observation. The X-ray image consists of four lensed image components, thus the photons are from the lensed QSO itself. The overall spectrum can be described with a power-law function heavily absorbed by neutral matter at a redshift consistent with the QSO redshift.
Abstract: We describe a project to study a sample of X-ray luminous clusters of galaxies at redsh... more Abstract: We describe a project to study a sample of X-ray luminous clusters of galaxies at redshift z~ 0.2 at several scales (with HST/WFPC2 and CFHT/CFH12k) and wavebands (optical and X-ray).
Abstract: The knowledge of the redshift of multiple images in cluster-lenses allows to determine ... more Abstract: The knowledge of the redshift of multiple images in cluster-lenses allows to determine precisely the total projected mass within the Einstein radius. The observation of various multiple images in a same cluster is opening new possibilities to constrain the curvature of the universe.
We summarise the main results on the faint submillimeter (submm) galaxy population that have come... more We summarise the main results on the faint submillimeter (submm) galaxy population that have come from the SCUBA Cluster Lens Survey. We detail our current understanding of the characteristics of these submm-selected galaxies across wavebands from X-rays to radio. After presenting the main observational properties of this population we conclude by discussing the nature of these distant, ultraluminous infrared galaxies and their relationship to other high-redshift populations.
Clusters of galaxies are the most recently assembled, massive, bound structures in the Universe. ... more Clusters of galaxies are the most recently assembled, massive, bound structures in the Universe. As predicted by General Relativity, given their masses, clusters strongly deform space-time in their vicinity. Clusters act as some of the most powerful gravitational lenses in the Universe. Light rays traversing through clusters from distant sources are hence deflected, and the resulting images of these distant objects therefore appear distorted and magnified. Lensing by clusters occurs in two regimes, each with unique observational ...
We have obtained Plateau de Bure Interferometer observations of HLSJ091828.6+514223 (z=5.24) at s... more We have obtained Plateau de Bure Interferometer observations of HLSJ091828.6+514223 (z=5.24) at six different frequencies to cover the CO(6-5), CO(7-6), CI, H_20_{p}(2,0,2-1,1,1), [NII] and [CII] lines. The high resolution and high sensitivity of these multi-configuration observations allow us to detect the various line velocity components as well as the continuum and to resolve spatially their emission. This wealth of information is used to tackle the problem of lens and source modeling. A methodology is implemented to produce image plane maps, optimize the lens model, and finally inverse the PdBI data in the source plane. The image plane and source plane maps are constructed by fitting directly the pixels to the PdBI visibilities with the non-negative least square method. The preliminary results thus obtained are presented.
Received too late, Accepted even later Abstract. We present the catalogue of a wide-field CFHT/WH... more Received too late, Accepted even later Abstract. We present the catalogue of a wide-field CFHT/WHT spectroscopic survey of the lensing cluster Cl0024+1654 at z = 0.395. This catalogue contains 618 new spectra, of which 581 have identified redshifts. Adding redshifts available from the literature, the final catalogue contains data for 687 objects with redshifts identified for 650 of them. 295
Abstract:[Abridged] Observations of molecular gas at all redshifts are critical for measuring the... more Abstract:[Abridged] Observations of molecular gas at all redshifts are critical for measuring the cosmic evolution in molecular gas density and understanding the star-formation history of the Universe. The 12CO molecule (J= 1-0 transition= 115.27 GHz) is the best proxy for extragalactic H2, which is the gas reservoir from which star formation occurs, and has been detected out to z~ 6.
ABSTRACT The impact of environment on active galactic nucleus (AGN) activity up to z~ 1 is assess... more ABSTRACT The impact of environment on active galactic nucleus (AGN) activity up to z~ 1 is assessed by utilizing a mass-selected sample of galaxies from the 10k catalog of the zCOSMOS spectroscopic redshift survey. We identify 147 AGN by their X-ray emission as detected by XMM-Newton from a parent sample of 7234 galaxies.
Abstract. We describe the fundamentals of vanilla and exotic microlensing. Deviations from the st... more Abstract. We describe the fundamentals of vanilla and exotic microlensing. Deviations from the standard form of an achromatic, time-symmetric lightcurve can be caused by the parallax and xallarap effects, finite source sized effects and binarity.
Abstract We present BAX, Base de Données Amas de Galaxies X (http://bax. ast. obs-mip. fr), a mul... more Abstract We present BAX, Base de Données Amas de Galaxies X (http://bax. ast. obs-mip. fr), a multi-wavelength database dedicated to X-ray clusters and groups of galaxies allowing detailed information retrieval.
Page 1. Lensing, Dynamics and X-ray of Clusters of Galaxies Jean-Paul KNEIB Laboratoire d'Astroph... more Page 1. Lensing, Dynamics and X-ray of Clusters of Galaxies Jean-Paul KNEIB Laboratoire d'Astrophysique de Marseille, France H. Ebeling, G. Smith, I. Smail, A. Edge, P. Hudelot, S. Bardeau, M. Limousin, P., G. Soucail, P. Marshall, G. Covone, E.Jullo, , the COSMOS lensing team, and many others Page 2. October 5, 2006 UCSB-KITP 2 Outline ❖Strong & Weak Lensing ❖Lensing in massive X-ray clusters ❖Cluster/groups in COSMOS ❖Future prospects A B C [OII] @ Z=1.55 MACSJ1149.5+2233 Page 3.
ABSTRACT We present extensive observations of a sample of distant, submillimetre (submm) galaxies... more ABSTRACT We present extensive observations of a sample of distant, submillimetre (submm) galaxies detected in the field of the massive cluster lens Abell 1835, using the Submm Common-User Bolometer Array (SCUBA). Taken in conjunction with earlier observations of other submmselected sources, we now have detailed, multiwavelength observations of seven examples of the submm population, having exploited the combination of achromatic amplification by cluster lenses and lavish archival data sets.
Abstract: Gravitational lensing has now become a popular tool to measure the mass distribution of... more Abstract: Gravitational lensing has now become a popular tool to measure the mass distribution of structures in the Universe on various scales. Here we focus on the study of galaxy's scale dark matter halos with galaxy-galaxy lensing techniques: observing the shapes of distant background galaxies which have been lensed by foreground galaxies allows us to map the mass distribution of the foreground galaxies.
Abstract: We summarize the main results obtained recently by our group on the identification and ... more Abstract: We summarize the main results obtained recently by our group on the identification and study of very high-z galaxies (z> 7) using lensing clusters as natural gravitational telescopes. A description of our pilot survey with ISAAC/VLT is presented, aimed at the spectroscopic confirmation of z> 7 candidate galaxies photometrically selected from deep near-IR, HST and optical ground-based imaging.
Abstract: We report the detection of az~ 7 galaxy strongly lensed by the massive galaxy cluster A... more Abstract: We report the detection of az~ 7 galaxy strongly lensed by the massive galaxy cluster Abell 2218 (z= 0.175) at 3.6 and 4.5 um using the Spitzer Observatory and at 1.1 um using the Hubble Space Telescope. The new data indicate a refined photometric redshift in the range of 6.6-6.8 depending on the presence of Ly-alpha emission.
Abstract: We present the X-ray energy spectrum of the lensed BAL QSO H1413+ 117 (the Cloverleaf) ... more Abstract: We present the X-ray energy spectrum of the lensed BAL QSO H1413+ 117 (the Cloverleaf) at z= 2.56 observed with the Chandra X-ray observatory. We detected 293 photons in a 40 ks Advanced CCD Imaging Spectrometer (ACIS-S) observation. The X-ray image consists of four lensed image components, thus the photons are from the lensed QSO itself. The overall spectrum can be described with a power-law function heavily absorbed by neutral matter at a redshift consistent with the QSO redshift.
Abstract: We describe a project to study a sample of X-ray luminous clusters of galaxies at redsh... more Abstract: We describe a project to study a sample of X-ray luminous clusters of galaxies at redshift z~ 0.2 at several scales (with HST/WFPC2 and CFHT/CFH12k) and wavebands (optical and X-ray).
Abstract: The knowledge of the redshift of multiple images in cluster-lenses allows to determine ... more Abstract: The knowledge of the redshift of multiple images in cluster-lenses allows to determine precisely the total projected mass within the Einstein radius. The observation of various multiple images in a same cluster is opening new possibilities to constrain the curvature of the universe.
We summarise the main results on the faint submillimeter (submm) galaxy population that have come... more We summarise the main results on the faint submillimeter (submm) galaxy population that have come from the SCUBA Cluster Lens Survey. We detail our current understanding of the characteristics of these submm-selected galaxies across wavebands from X-rays to radio. After presenting the main observational properties of this population we conclude by discussing the nature of these distant, ultraluminous infrared galaxies and their relationship to other high-redshift populations.
Uploads
Papers