Search Publications
Characterizing dw1335-29, a recently discovered dwarf satellite of M83
Bell, Eric F.; Monachesi, Antonela; Bailin, Jeremy +4 more
The number, distribution and properties of dwarf satellites are crucial probes of the physics of galaxy formation at low masses and the response of satellite galaxies to the tidal and gas dynamical effects of their more massive parent. To make progress, it is necessary to augment and solidify the census of dwarf satellites of galaxies outside the …
Pushing the limits: detecting H2 emission from faint bipolar planetary nebulae in the IPHAS sample
Guerrero, M. A.; Santamaría, E.; Ramos-Larios, G. +1 more
We have obtained deep narrowband images in the near-infrared H2 λ2.122 µm emission line for a sample of 15 faint Isaac Newton Telescope Photometric H α Survey (IPHAS) bipolar planetary nebulae (PNe) to search for molecular material. H2 emission is found in most of them (14 out of 15), mostly associated with rings at the…
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 …