Search Publications
Open star clusters in the Milky Way. Comparison of photometric and trigonometric distance scales based on Gaia TGAS data
Reffert, Sabine; Scholz, Ralf-Dieter; Kovaleva, Dana A. +5 more
Context. The global survey of star clusters in the Milky Way (MWSC) is a comprehensive list of 3061 objects that provides, among other parameters, distances to clusters based on isochrone fitting. The Tycho-Gaia Astrometric Solution (TGAS) catalogue, which is a part of Gaia data release 1 (Gaia DR1), delivers accurate trigonometric parallax measur…
Gaia Data Release 1. The archive visualisation service
Mora, A.; Jordan, S.; Luri, X. +31 more
Context. The first Gaia data release (DR1) delivered a catalogue of astrometry and photometry for over a billion astronomical sources. Within the panoplyof methods used for data exploration, visualisation is often the starting point and even the guiding reference for scientific thought. However, this is a volume of data that cannot be efficiently …
Diversity of dwarf galaxy IR-submm emission patterns: CLUES from hydrodynamical simulations
Brook, Chris B.; Obreja, Aura; Granato, Gian Luigi +2 more
Context. The spectral energy distributions (SEDs) of low-mass low-metallicity (dwarf) galaxies are a challenging piece of the puzzle of galaxy formation in the near Universe. These SEDs show some particular features in the submillimeter to far-infrared (FIR) wavelength range compared to normal larger galaxies that cannot be explained by the curren…
Distribution of water in the G327.3-0.6 massive star-forming region
van Dishoeck, E. F.; van der Tak, F.; Leurini, S. +3 more
Aims: Following our past study of the distribution of warm gas in the G327.3-0.6 massive star-forming region, we aim here at characterizing the large-scale distribution of water in this active region of massive star formation made of individual objects in different evolutionary phases. We investigate possible variations of the water abundance…
Application of time transfer functions to Gaia's global astrometry. Validation on DPAC simulated Gaia-like observations
Bertone, Stefano; Bucciarelli, Beatrice; Lattanzi, Mario G. +5 more
Context. A key objective of the ESA Gaia satellite is the realization of a quasi-inertial reference frame at visual wavelengths by means of global astrometric techniques. This requires accurate mathematical and numerical modeling of relativistic light propagation, as well as double-blind-like procedures for the internal validation of the results, …
The properties of red giant stars along the Sagittarius tidal tails
Zhang, X.; Zhou, L.; Zhao, G. +10 more
Aims: We aim to measure the metallicity distribution and velocity distribution of red giant branch (RGB) stars along the Sagittarius dwarf galaxy (Sgr) streams. Thanks to the large number of stars of the Sloan Digital Sky Survey (SDSS) sample, we can study the properties of streams as a function of the Λ⊙ from the Sgr core.
Me…
Evaluation of a possible upgrade of the IAU 2006 precession
Liu, J. -C.; Capitaine, N.
Context. The International Astronomical Union (IAU) adopted a new precession model at its 2006 General Assembly. After more than ten years since the publication of the so-called IAU 2006 precession, we have noticed progress in solar system ephemerides and geophysical observations, which can be used to refine the precession model. Another progress …
Correlation of gas dynamics and dust in the evolved filament G82.65-02.00
Juvela, M.; Marshall, D. J.; Montier, L. +12 more
Context. The combination of line and continuum observations can provide vital insight into the formation and fragmentation of filaments and the initial conditions for star formation. We have carried out line observations to map the kinematics of an evolved, actively star forming filament G82.65-2.00. The filament was first identified from the Plan…
HI properties and star formation history of a fly-by pair of blue compact dwarf galaxies
Staveley-Smith, Lister; Sung, Eon-Chang; Chung, Aeree +3 more
A fly-by interaction has been suggested to be one of the major explanations for enhanced star formation in blue compact dwarf (BCD) galaxies, yet no direct evidence for this scenario has been found to date. In the Hi Parkes all-sky survey (HIPASS), ESO 435-IG 020 and ESO 435-G 016, a BCD pair were found in a common, extended gas envelope of atomic…
Deuterium fractionation of a distant cold dark cloud along the line of sight of W51
Gerin, M.; Vastel, C.; Mookerjea, B. +1 more
Herschel/HIFI observations toward the compact HII region W51 has revealed the presence of a cold dense core along its line of sight in a high-velocity stream located just in front of W51. This detection has been made possible through absorption measurements of low-energy transitions of HDO, NH3, and C3 against the bright back…