Search Publications
Gaia Data Release 1. Reference frame and optical properties of ICRF sources
Holl, B.; Biermann, M.; Hutton, A. +18 more
Context. As part of the data processing for Gaia Data Release 1 (Gaia DR1) a special astrometric solution was computed, the so-called auxiliary quasar solution. This gives positions for selected extragalactic objects, including radio sources in the second realisation of the International Celestial Reference Frame (ICRF2) that have optical counterp…
AGN host galaxy mass function in COSMOS. Is AGN feedback responsible for the mass-quenching of galaxies?
Ilbert, O.; Silverman, J. D.; Salvato, M. +11 more
We investigate the role of supermassive black holes in the global context of galaxy evolution by measuring the host galaxy stellar mass function (HGMF) and the specific accretion rate, that is, λSAR, the distribution function (SARDF), up to z ~ 2.5 with ~1000 X-ray selected AGN from XMM-COSMOS. Using a maximum likelihood approach, we jo…
Regional surface morphology of comet 67P/Churyumov-Gerasimenko from Rosetta/OSIRIS images: The southern hemisphere
Jorda, L.; Lamy, P. L.; Lara, L. M. +49 more
Aims: The OSIRIS camera on board the Rosetta spacecraft has been acquiring images of the comet 67P/Churyumov-Gerasimenko (67P)'s nucleus since August 2014. Starting in May 2015, the southern hemisphere gradually became illuminated and was imaged for the first time. Here we present the regional morphology of the southern hemisphere, which serv…
Physical conditions in the central molecular zone inferred by H3+
Le Petit, Franck; Ruaud, Maxime; Bron, Emeric +4 more
Context. The H3+ molecule has been detected in many lines of sight within the central molecular zone (CMZ) with exceptionally large column densities and unusual excitation properties compared to diffuse local clouds. The detection of the (3, 3) metastable level has been suggested to be the signature of warm and diffuse gas in…
MUSE crowded field 3D spectroscopy of over 12 000 stars in the globular cluster NGC 6397. II. Probing the internal dynamics and the presence of a central black hole
Dreizler, S.; Brinchmann, J.; Roth, M. M. +8 more
We present a detailed analysis of the kinematics of the Galactic globular cluster
The Musca cloud: A 6 pc-long velocity-coherent, sonic filament
Alves, J.; Beuther, H.; Tafalla, M. +2 more
Filaments play a central role in the molecular clouds' evolution, but their internal dynamical properties remain poorly characterized. To further explore the physical state of these structures, we have investigated the kinematic properties of the Musca cloud. We have sampled the main axis of this filamentary cloud in 13CO and C18
Gaia Data Release 1. The Cepheid and RR Lyrae star pipeline and its application to the south ecliptic pole region
Szabados, L.; Rimoldini, L.; Holl, B. +24 more
Context. The European Space Agency spacecraft Gaia is expected to observe about 10 000 Galactic Cepheids and over 100 000 Milky Way RR Lyrae stars (a large fraction of which will be new discoveries), during the five-year nominal lifetime spent scanning the whole sky to a faint limit of G = 20.7 mag, sampling their light variation on average about …
High angular resolution Sunyaev-Zel'dovich observations of MACS J1423.8+2404 with NIKA: Multiwavelength analysis
Adam, R.; Arnaud, M.; Benoît, A. +42 more
The prototype of the NIKA2 camera, NIKA, is a dual-band instrument operating at the IRAM 30-m telescope, which can observe the sky simultaneously at 150 and 260 GHz. One of the main goals of NIKA (and NIKA2) is to measure the pressure distribution in galaxy clusters at high angular resolution using the thermal Sunyaev-Zel'dovich (tSZ) effect. Such…
Chemical differentiation in a prestellar core traces non-uniform illumination
Caselli, P.; Spezzano, S.; Harju, J. +2 more
Dense cloud cores present chemical differentiation because C- and N-bearing molecules are distributed differently, the latter being less affected by freeze-out onto dust grains. In this letter we show that two C-bearing molecules, CH3OH and c-C3H2, present a strikingly different (complementary) morphology while sho…
Deep MUSE observations in the HDFS. Morpho-kinematics of distant star-forming galaxies down to 108M⊙
Inami, H.; Richard, J.; Bouché, N. +20 more
Aims: Whereas the evolution of gas kinematics of massive galaxies is now relatively well established up to redshift z ~ 3, little is known about the kinematics of lower mass (M⋆≤ 1010M⊙) galaxies. We use MUSE, a powerful wide-field, optical integral-field spectrograph (IFS) recently mounted on the VLT, to char…