Search Publications
Discovery of a rich proto-cluster at z = 2.9 and associated diffuse cold gas in the VIMOS Ultra-Deep Survey (VUDS)
Maccagni, D.; Cimatti, A.; Ilbert, O. +42 more
High-density environments are crucial places for studying the link between hierarchical structure formation and stellar mass growth in galaxies. In this work, we characterise a massive proto-cluster at z = 2.895 that we found in the COSMOS field using the spectroscopic sample of the VIMOS Ultra-Deep Survey (VUDS). This is one of the rare structure…
The extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II). IV. X-ray luminosity function and first constraints on cosmological parameters
Collins, Chris A.; Böhringer, Hans; Chon, Gayoung
The X-ray luminosity function that is closely related to the cluster mass function is an important statistic of the census of galaxy clusters in our Universe. It is also an important means to probe the cosmological model of our Universe. Based on our recently completed REFLEX II cluster sample comprising 910 galaxy clusters with redshifts we const…
JKCS 041: a Coma cluster progenitor at z = 1.803
Andreon, S.; Treu, T.; Newman, A. B. +3 more
Using deep two-color near-infrared HST imaging and unbiased grism spectroscopy, we present a detailed study of the z = 1.803 JKCS 041 cluster. We confirm, for the first time for a high-redshift cluster, a mass of log M ≳ 14.2 in solar units using four different techniques based on the X-ray temperature, the X-ray luminosity, the gas mass, and the …
Constraints on the star-formation rate of z ~ 3 LBGs with measured metallicity in the CANDELS GOODS-South field
Maiolino, R.; Schaerer, D.; Ferguson, H. C. +19 more
Aims: We aim to constrain the assembly history of high-redshift galaxies and the reliability of UV-based estimates of their physical parameters from an accurate analysis of a unique sample of z ~ 3 Lyman-break galaxies (LBGs).
Methods: We analyse 14 LBGs at z ~ 2.8-3.8 constituting the only sample where both a spectroscopic measurement o…
The formation heights of coronal shocks from 2D density and Alfvén speed maps
Gallagher, Peter T.; Zucca, Pietro; Carley, Eoin P. +1 more
Context. Super-Alfvénic shocks associated with coronal mass ejections (CMEs) can produce radio emission known as Type II bursts. In the absence of direct imaging, accurate estimates of coronal electron densities, magnetic field strengths, and Alfvén speeds are required to calculate the kinematics of shocks. To date, 1D radial models have been used…
The rotation state of 67P/Churyumov-Gerasimenko from approach observations with the OSIRIS cameras on Rosetta
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +46 more
Aims: Approach observations with the Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) experiment onboard Rosetta are used to determine the rotation period, the direction of the spin axis, and the state of rotation of comet 67P's nucleus.
Methods: Photometric time series of 67P have been acquired by OSIRIS since the pos…
Chemical composition and constraints on mass loss for globular clusters in dwarf galaxies: WLM and IKN
Forbes, Duncan A.; Brodie, Jean P.; Strader, Jay +1 more
Aims: We determine the metallicities of globular clusters (GCs) in the
Molecular ions in the protostellar shock L1157-B1
Podio, L.; Codella, C.; Ceccarelli, C. +2 more
Aims: We perform a complete census of molecular ions with an abundance greater than ~10-10 in the protostellar shock L1157-B1. This allows us to study the ionisation structure and chemistry of the shock.
Methods: An unbiased high-sensitivity survey of L1157-B1 performed with the IRAM-30 m and Herschel/HIFI as part of the CHESS…
Dust and gas in luminous proto-cluster galaxies at z = 4.05: the case for different cosmic dust evolution in normal and starburst galaxies
Daddi, E.; Elbaz, D.; Béthermin, M. +14 more
We measure the dust and gas content of the three submillimeter galaxies (SMGs) in the GN20 proto-cluster at z = 4.05 using new IRAM Plateau de Bure interferometer (PdBI) CO(4-3) and 1.2-3.3 mm continuum observations. All these three SMGs are heavily dust obscured, with UV-based star formation rate (SFR) estimates significantly smaller than the one…
A hidden reservoir of Fe/FeS in interstellar silicates?
Ysard, N.; Jones, A.; Köhler, M.
Context. The depletion of iron and sulphur into dust in the interstellar medium and the exact nature of interstellar amorphous silicate grains is still an open question.
Aims: We study the incorporation of iron and sulphur into amorphous silicates of olivine- and pyroxene-types and their effects on the dust spectroscopy and thermal emission. …