Search Publications
Substructure and merger detection in resolved NIKA Sunyaev-Zel'dovich images of distant clusters
Adam, R.; Arnaud, M.; Benoît, A. +48 more
Substructures in the hot gas atmosphere of galaxy clusters are related to their formation history and to the astrophysical processes at play in the intracluster medium (ICM). The thermal Sunyaev-Zel'dovich (tSZ) effect is directly sensitive to the line-of-sight integrated ICM pressure, and is thus particularly adapted to study ICM substructures. I…
First detection of bromine and antimony in hot stars
Rauch, T.; Werner, K.; Kruk, J. W. +1 more
Bromine (Z = 35) and antimony (Z = 51) are extremely difficult to detect in stars. In very few instances, weak and mostly uncertain identifications of Br I, Br II, and Sb II in relatively cool, chemically peculiar stars were successful. Adopted solar abundance values rely on meteoritic determinations. Here, we announce the first identification of …
Multi-spacecraft observations and transport simulations of solar energetic particles for the May 17th 2012 event
Dalla, S.; Guo, J.; Wimmer-Schweingruber, R. +3 more
Context. The injection, propagation and arrival of solar energetic particles (SEPs) during eruptive solar events is an important and current research topic of heliospheric physics. During the largest solar events, particles may have energies up to a few GeVs and sometimes even trigger ground-level enhancements (GLEs) at Earth. These large SEP even…
Molecular gas in AzTEC/C159: a star-forming disk galaxy 1.3 Gyr after the Big Bang
Magnelli, B.; Smolčić, V.; van Kampen, E. +23 more
We studied the molecular gas properties of AzTEC/C159, a star-forming disk galaxy at z = 4.567, in order to better constrain the nature of the high-redshift end of the submillimeter-selected galaxy (SMG) population. We secured 12CO molecular line detections for the J = 2 →1 and J = 5 →4 transitions using the Karl G. Jansky Very Large Ar…
Exposed bright features on the comet 67P/Churyumov-Gerasimenko: distribution and evolution
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +46 more
Context. Since its arrival at the comet 67P/Churyumov-Gerasimenko in August 2014, the Rosetta spacecraft followed the comet as it went past the perihelion and beyond until September 2016. During this time there were many scientific instruments operating on board Rosetta to study the comet and its evolution in unprecedented detail. In this context,…
VLT/SPHERE astrometric confirmation and orbital analysis of the brown dwarf companion HR 2562 B
Rouan, D.; Augereau, J. -C.; Henning, T. +46 more
Context. A low-mass brown dwarf has recently been imaged around HR 2562 (HD 50571), a star hosting a debris disk resolved in the far infrared. Interestingly, the companion location is compatible with an orbit coplanar with the disk and interior to the debris belt. This feature makes the system a valuable laboratory to analyze the formation of subs…
Molecular gas in the northern nucleus of Mrk 273: Physical and chemical properties of the disc and its outflow
Krips, M.; van der Werf, P.; García-Burillo, S. +11 more
Aiming to characterise the properties of the molecular gas in the ultra-luminous infrared galaxy Mrk 273 and its outflow, we used the NOEMA interferometer to image the dense-gas molecular tracers HCN, HCO+, HNC, HOC+ and HC3N at ∼86 GHz and ∼256 GHz with angular resolutions of 4ʺ̣9 × 4ʺ̣5 (∼3.7 × 3.4 kpc) and 0ʺ̣61 × …
A reevaluation of the 2MASS zero points using CALSPEC spectrophotometry complemented with Gaia Data Release 2 parallaxes
Maíz Apellániz, J.; Pantaleoni González, M.
Context. 2MASS is the reference survey in the near-infrared (NIR) part of the spectrum due to its whole-sky coverage, large dynamic range, and proven calibration uniformity. However, previous studies disagree on the value of the zero points (ZPs) for its three bands JHK at the hundredth of a magnitude level. The disagreement should become more not…
The bivariate luminosity and mass functions of the local HRS galaxy sample. The stellar, dust, and gas mass functions
Andreani, P.; Ciesla, L.; Buat, V. +4 more
Aims: We discuss the results of the relationships between the K-band and stellar mass, FIR luminosities, star formation rate, and the masses of the dust and gas of nearby galaxies computing the bivariate K-band-luminosity function (BLF) and bivariate K-band-mass function (BMF) of the Herschel Reference Survey (HRS), a volume-limited sample wi…
The XXL Survey: XXIII. The Mass Scale of XXL Clusters from Ensemble Spectroscopy
Valtchanov, Ivan; Driver, Simon P.; Rapetti, David +34 more
Context. An X-ray survey with the XMM-Newton telescope, XMM-XXL, has identified hundreds of galaxy groups and clusters in two 25 deg2 fields. Combining spectroscopic and X-ray observations in one field, we determine how the kinetic energy of galaxies scales with hot gas temperature and also, by imposing prior constraints on the relative…