Search Publications
The MUSE Hubble Ultra Deep Field Survey. IX. Evolution of galaxy merger fraction since z ≈ 6
Inami, H.; Steinmetz, M.; Bouché, N. +13 more
We provide, for the first time, robust observational constraints on the galaxy major merger fraction up to z ≈ 6 using spectroscopic close pair counts. Deep Multi Unit Spectroscopic Explorer (MUSE) observations in the Hubble Ultra Deep Field (HUDF) and Hubble Deep Field South (HDF-S) are used to identify 113 secure close pairs of galaxies among a …
Hayabusa-2 mission target asteroid 162173 Ryugu (1999 JU3): Searching for the object's spin-axis orientation
Altieri, B.; Greiner, J.; Schady, P. +27 more
The JAXA Hayabusa-2 mission was approved in 2010 and launched on December 3, 2014. The spacecraft will arrive at the near-Earth asteroid 162173 Ryugu (1999 JU3) in 2018 where it will perform a survey, land and obtainsurface material, then depart in December 2019 and return to Earth in December 2020. We observed Ryugu with the Herschel S…
Mapping the kinetic Sunyaev-Zel'dovich effect toward MACS J0717.5+3745 with NIKA
Adam, R.; Arnaud, M.; Benoît, A. +47 more
Measurement of the gas velocity distribution in galaxy clusters provides insight into the physics of mergers, through which large scale structures form in the Universe. Velocity estimates within the intracluster medium (ICM) can be obtained via the Sunyaev-Zel'dovich (SZ) effect, but its observation is challenging both in term of sensitivity requi…
The implications of the surprising existence of a large, massive CO disk in a distant protocluster
Altieri, B.; Valtchanov, I.; Tanaka, M. +18 more
It is not yet known if the properties of molecular gas in distant protocluster galaxies are significantly affected by their environment as galaxies are in local clusters. Through a deep, 64 h of effective on-source integration with the Australian Telescope Compact Array (ATCA), we discovered a massive, Mmol = 2.0 ± 0.2× 1011 …
Study of the aluminium content in AGB winds using ALMA. Indications for the presence of gas-phase (Al2O3)n clusters
Waters, L. B. F. M.; Decin, L.; Richards, A. M. S. +8 more
Context. The condensation of inorganic dust grains in the winds of evolved stars is poorly understood. As of today, it is not yet known which molecular clusters form the first dust grains in oxygen-rich (C/O < 1) asymptotic giant branch (AGB) winds. Aluminium oxides and iron-free silicates are often put forward as promising candidates for the f…
An X-ray/SDSS sample. I. Multi-phase outflow incidence and dependence on AGN luminosity
Brusa, M.; Lanzuisi, G.; Perna, M. +2 more
Aims: The connection between the growth of super-massive black holes (SMBHs) and the evolution of their host galaxies is nowadays well established, although the underlying mechanisms explaining their mutual relations are still debated. Multi-phase fast, massive outflows have been postulated to play a crucial role in this process. The aim of t…
In-depth study of moderately young but extremely red, very dusty substellar companion HD 206893B
Rouan, D.; Absil, O.; Henning, T. +47 more
Context. The substellar companion HD 206893b has recently been discovered by direct imaging of its disc-bearing host star with the Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument.
Aims: We investigate the atypical properties of the companion, which has the reddest near-infrared colours among all known substellar obje…
Formation of bi-lobed shapes by sub-catastrophic collisions. A late origin of comet 67P's structure
Benz, W.; Jutzi, M.
Context. The origin of the particular shape of comet 67P/Churyumov-Gerasimenko (67P) is a topic of active research. How and when it acquired its peculiar characteristics has distinct implications on the origin of the solar system and its dynamics.
Aims: We investigate how shapes such as that of comet 67P can result from a new type of low-ener…
Do galaxies that leak ionizing photons have extreme outflows?
Chisholm, J.; Schaerer, D.; Thuan, T. X. +5 more
Context. To reionize the early universe, high-energy photons must escape the galaxies that produce them. How these photons escape is debated because too many ionizing photons are absorbed even at small H I column densities. It has been suggested that stellar feedback drives galactic outflows out of star-forming regions, creating low density channe…
The population of hot subdwarf stars studied with Gaia. I. The catalog of known hot subdwarf stars
Geier, S.; Gänsicke, B. T.; Green, E. M. +5 more
In preparation for the upcoming all-sky data releases of the Gaia mission we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases. The catalog contains 5613 unique sources and provides multi-band photometry from the ultraviolet to the far infrared, ground based proper motions, classi…