Search Publications
IRTF/TEXES observations of the H II regions H1 and H2 in the Galactic Centre
Wang, Q. Daniel; Dong, Hui; Schödel, Rainer +6 more
We present new [Ne II] (12.8 µm) IRTF/TEXES observations of the Galactic Center H II regions H1 and H2, which are at a projected distance of ∼11 pc from the centre of the Galaxy. The new observations allow us to map the radial velocity distributions of ionized gas. The high spectroscopic resolution (∼4 km s-1) helps us to disentan…
Transit probabilities around hypervelocity and runaway stars
Ginsburg, I.; Fragione, G.
In the blooming field of exoplanetary science, NASA's Kepler Space Telescope has revolutionized our understanding of exoplanets. Kepler's very precise and long-duration photometry is ideal for detecting planetary transits around Sun-like stars. The forthcoming Transiting Exoplanet Survey Satellite (TESS) is expected to continue Kepler's legacy. Al…
Infrared dust bubble CS51 and its interaction with the surrounding interstellar medium
Tej, Anandmayee; Liu, Hong-Li; Liu, Tie +4 more
A multiwavelength investigation of the southern infrared dust bubble CS51 is presented in this paper. We probe the associated ionized, cold dust, molecular and stellar components. Radio continuum emission mapped at 610 and 1300 MHz, using the Giant Metrewave Radio Telescope, India, reveals the presence of three compact emission components (A, B, a…
Climbing the cosmic ladder with stellar twins in RAVE with Gaia
Gilmore, G.; Munari, U.; Steinmetz, M. +17 more
We apply the twin method to determine parallaxes to 232 545 stars of the RAVE survey using the parallaxes of Gaia DR1 as a reference. To search for twins in this large data set, we apply the t-student stochastic neighbour embedding projection that distributes the data according to their spectral morphology on a two-dimensional map. From this map, …
The PMA Catalogue: 420 million positions and absolute proper motions
Akhmetov, V. S.; Fedorov, P. N.; Velichko, A. B. +1 more
We present a catalogue that contains about 420 million absolute proper motions of stars. It was derived from the combination of positions from Gaia DR1 and 2MASS, with a mean difference of epochs of about 15 yr. Most of the systematic zonal errors inherent in the 2MASS Catalogue were eliminated before deriving the absolute proper motions. The abso…
Torus models of the outer disc of the Milky Way using LAMOST survey data
Mao, Shude; Liu, Chao; Wang, Qiao +2 more
With a sample of 48 161 K giant stars selected from the LAMOST DR 2 catalogue, we construct torus models in a large volume extending, for the first time, from the solar vicinity to a Galactocentric distance of ∼20 kpc, reaching the outskirts of the Galactic disc. We show that the kinematics of the K giant stars match conventional models, e.g. as c…
First results from SAM-FP: Fabry-Perot observations with ground-layer adaptive optics - the structure and kinematics of the core of 30 Doradus
Mendes de Oliveira, C.; Barbá, R.; Amram, P. +3 more
The aim of this paper is to present the first data set obtained with SOAR Adaptive Module-Fabry-Parot (SAM-FP), a Fabry-Perot instrument mounted inside the SOAR telescope Adaptive-Optics Module. This is the only existing imaging Fabry-Perot interferometer using laser-assisted ground-layer adaptive optics. SAM-FP was used to observe the ionized gas…
The low-luminosity behaviour of the 4U 0115+63 Be/X-ray transient
Degenaar, N.; Wijnands, R.; Cavecchi, Y. +3 more
The Be/X-ray transient 4U 0115+63 exhibited a giant, type-II outburst in 2015 October. The source did not decay to its quiescent state but settled in a meta-stable plateau state (a factor ∼ 10 brighter than quiescence) in which its luminosity slowly decayed. We used XMM-Newton to observe the system during this phase and we found that its spectrum …
Energy-angle dispersion of accelerated heavy ions at 67P/Churyumov-Gerasimenko: implication in the mass-loading mechanism
Yamauchi, M.; Behar, E.; Nilsson, H. +4 more
The Rosetta spacecraft studied the comet 67P/Churyumov-Gerasimenko for nearly two years. The Ion Composition Analyzer instrument on board Rosetta observed the positive ion distributions in the environment of the comet during the mission. A portion of the comet's neutral coma is expected to get ionized, depending on the comet's activity and positio…
The effect of unresolved contaminant stars on the cross-matching of photometric catalogues
Wilson, Tom J.; Naylor, Tim
A fundamental process in astrophysics is the matching of two photometric catalogues. It is crucial that the correct objects be paired, and that their photometry does not suffer from any spurious additional flux. We compare the positions of sources in Wide-field Infrared Survey Explorer (WISE), INT Photometric H α Survey, Two Micron All Sky Survey …