Search Publications
The intricate Galaxy disk: velocity asymmetries in Gaia-TGAS
Prusti, T.; Figueras, F.; Antoja, T. +3 more
We use Gaia-TGAS data to compare the transverse velocities in Galactic longitude (coming from proper motions and parallaxes) in the Milky Way disk for negative and positive longitudes as a function of distance. The transverse velocities are strongly asymmetric and deviate significantly from the expectations for an axisymmetric galaxy. The value an…
Mapping diffuse interstellar bands in the local ISM on small scales via MUSE 3D spectroscopy. A pilot study based on globular cluster NGC 6397
Richter, Philipp; Brinchmann, Jarle; Weilbacher, Peter M. +6 more
Context. We map the interstellar medium (ISM) including the diffuse interstellar bands (DIBs) in absorption toward the globular cluster NGC 6397 using VLT/MUSE. Assuming the absorbers are located at the rim of the Local Bubble we trace structures on the order of mpc (milliparsec, a few thousand AU).
Aims: We aimed to demonstrate the feasibili…
Ground-based astrometry calibrated by Gaia DR1: new perspectives in asteroid orbit determination
Mignard, F.; Tanga, P.; Altmann, M. +10 more
Context. The Gaia Data Release 1 (GDR1) is a first, important step on the path of evolution of astrometric accuracy towards a much improved situation. Although asteroids are not present in GDR1, this intermediate release already impacts asteroid astrometry.
Aims: Our goal is to investigate how the GDR1 can change the approach to a few typical…
Mapping the temperature of the intra-cluster medium with the thermal Sunyaev-Zel'dovich effect
Hurier, G.; Tchernin, C.
The hot electrons in the intra-cluster medium produce a spectral distortion of the cosmic microwave background (CMB) black body emission, the thermal Sunyaev-Zel'dovich effect (tSZ). This characteristic spectral distortion is now commonly used to detect and characterize the properties of galaxy clusters. The tSZ effect spectral distortion does not…
A CO survey on a sample of Herschel cold clumps
Juvela, M.; Ristorcelli, I.; Montillaud, J. +4 more
Context. The physical state of cold cloud clumps has a great impact on the process and efficiency of star formation and the masses of the forming stars inside these objects. The sub-millimetre survey of the Planck space observatory and the far-infrared follow-up mapping of the Herschel space telescope provide an unbiased, large sample of these col…
Thermophysics of fractures on comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +55 more
Context. The camera OSIRIS on board Rosetta obtained high-resolution images of the nucleus of comet 67P/Churyumov-Gerasimenko (67P). Great parts of the nucleus surface are composed of fractured terrain.
Aims: Fracture formation, evolution, and their potential relationship to physical processes that drive activity are not yet fully understood.…
Deriving physical parameters of unresolved star clusters. V. M 31 PHAT star clusters
Vansevičius, V.; Stonkutė, R.; de Meulenaer, P.
Context. This study is the fifth of a series that investigates the degeneracy and stochasticity problems present in the determination of physical parameters such as age, mass, extinction, and metallicity of partially resolved or unresolved star cluster populations in external galaxies when using HST broad-band photometry.
Aims: In this work w…
Synthetic IRIS spectra of the solar transition region: Effect of high-energy tails
Vocks, C.; Dzifčáková, E.; Dudík, J.
Aims: The solar transition region satisfies the conditions for presence of non-Maxwellian electron energy distributions with high-energy tails at energies corresponding to the ionization potentials of many ions emitting in the extreme-ultraviolet and ultraviolet portions of the spectrum.
Methods: We calculate the synthetic Si iv, O iv, a…
Source clustering in the Hi-GAL survey determined using a minimum spanning tree method
Elia, D.; Pezzuto, S.; Schisano, E. +5 more
Aims: The aims are to investigate the clustering of the far-infrared sources from the Herschel infrared Galactic Plane Survey (Hi-GAL) in the Galactic longitude range of -71 to 67 deg. These clumps, and their spatial distribution, are an imprint of the original conditions within a molecular cloud. This will produce a catalogue of over-densiti…
Chromospheric impact of an exploding solar granule
Bello González, N.; Rezaei, R.; Fischer, C. E.
Context. Observations of multi-wavelength and therefore height-dependent information following events throughout the solar atmosphere and unambiguously assigning a relation between these rapidly evolving layers are rare and difficult to obtain. Yet, they are crucial for our understanding of the physical processes that couple the different regimes …