Search Publications
Evolution of Molecular Clouds in the Superwind Galaxy NGC 1808 Probed by ALMA Observations
Salak, Dragan; Tomiyasu, Yuto; Nakai, Naomasa +3 more
ALMA imaging of the cold molecular medium in the nearby starburst galaxy NGC 1808 is presented. The observations reveal the distribution of molecular gas, traced by 12CO (1-0) and 12CO (3-2), and continuum (93 and 350 GHz) across the central 1 kpc starburst region at a high resolution of ∼ 1\prime\prime . A molecul…
π Aquarii is another γ Cassiopeiae object
Nazé, Yaël; Rauw, Gregor; Cazorla, Constantin
The γ Cas category is a subgroup of Be stars displaying a strong, hard, and variable thermal X-ray emission. An XMM-Newton observation of π Aqr reveals spectral and temporal characteristics that clearly make this Be star another member of the γ Cas category. Furthermore, π Aqr is a binary but, contrary to γ Cas, the nature of the companion to the …
The science planning process on the Rosetta mission
Altobelli, Nicolas; Choukroun, Mathieu; Vallat, Claire +9 more
The Rosetta mission arrived at comet 67 P/Churyumov-Gerasimenko in Summer 2014, after more than 10 years in space. All previous mission encounters with a comet have provided a snapshot of the cometary activity at a given heliocentric distance. In contrast, Rosetta has escorted the comet nucleus for an extended period (>2 years) at a large range…
Spectroscopic and photometric oscillatory envelope variability during the S Doradus outburst of the luminous blue variable R71
Stahl, O.; Asmus, D.; Bartlett, E. S. +7 more
Context. Luminous blue variables (LBVs) are evolved massive stars that exhibit instabilities that are not yet understood. Stars can lose several solar masses during this evolutionary phase. The LBV phenomenon is thus critical to our understanding of the evolution of the most massive stars.
Aims: The LBV R71 in the Large Magellanic Cloud is pr…
Predictions for the detection of tidal streams with Gaia using great-circle methods
Wang, Wenting; Cole, Shaun; Aguilar, Luis +5 more
The Gaia astrometric mission may offer an unprecedented opportunity to discover new tidal streams in the Galactic halo. To test this, we apply nGC3, a great-circle-cell count method that combines position and proper motion data to identify streams, to 10 mock Gaia catalogues of K giants and RR Lyrae stars constructed from cosmological simulations …
Discontinuous drainage systems formed by highland precipitation and ground-water outflow in the Navua Valles and southwest Hadriacus Mons regions, Mars
Hargitai, H. I.; Gulick, V. C.; Glines, N. H.
The Navua Valles are systems of paleodrainages located north of Dao Vallis, which empty into Hellas Planitia, the largest impact basin on Mars. In this study, we mapped and characterized the Navua Valles Region's individual drainage systems, including drainages along the southwestern flank of Hadriacus Mons, and one valley network from the same so…
Modelling the size of the very dynamic diamagnetic cavity of comet 67P/Churyumov-Gerasimenko
Szego, K.; Goetz, C.; Richter, I. +5 more
After the first detection of the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko, it became apparent that the boundary of this plasma region is very dynamic. To date hundreds of short cavity crossing events were detected, none lasting longer than an hour. This intermittent set of short events is very different from the classical cavity obser…
Herschel Spectroscopy of Early-type Galaxies
Young, Lisa M.; Crocker, Alison; Lapham, Ryen Carl
We present Herschel spectroscopy of atomic lines arising in photodissociation regions as well as ionization regions of nearby early-type galaxies (ETGs), focusing on the volume-limited Atlas3D sample. Our data include the [C II], [O I], and [N II] 122 and 205 µm lines, along with ancillary data including CO and H I maps. We find that ETGs ha…
Redetection of the Ionospheric H3+ Signature of Saturn's "Ring Rain"
Baines, Kevin H.; O'Donoghue, James; Moore, Luke +4 more
In April 2011 Saturn's midlatitude ionospheric H3+ emissions were detected, exhibiting anomalous (nonsolar) H3+ latitudinal variations consistent with the transport of water from specific locations in Saturn's rings, known as "ring rain". These products, transported to the planet along the magnetic field, may help to explain the unusual pattern of…
Precise CCD positions of Triton in 2014-2016 using the newest Gaia DR1 star catalogue
Wang, N.; Peng, Q. Y.; Xie, H. J. +3 more
755 new CCD observations during the years 2014-2016 have been reduced to derive the precise positions of Triton, the first satellite of Neptune. The observations were made by the 1-m telescope at Yunnan Observatory over 15 nights. The positions of Triton are measured with respect to the stars in Gaia DR1 star catalogue. The theoretical position of…