Search Publications
Missions
Journals
Publication Years
Edge-on Galaxies in the Hubble Ultra Deep Field
Savchenko, S. S.; Reshetnikov, V. P.; Usachev, P. A.
We have produced a sample of 58 edge-on spiral galaxies at redshifts z 1 selected in the Hubble Ultra Deep Field. For all galaxies we have analyzed the 2D brightness distributions in the V 606 and i 775 filters and measured the radial ( h r ) and vertical ( h z ) exponential scale lengths of the bright…
Climatology of CH4, HCN and C2H2 in Titan's upper atmosphere from Cassini/VIMS observations
Funke, Bernd; Filacchione, Gianrico; García-Comas, Maya +7 more
The Visual and Infrared Mapping Spectrometer (VIMS) measurements of non-Local Thermodinamic Equilibrium (non-LTE) emissions of CH4, HCN and C2H2 in the near-infrared represent a dataset with unique coverage to study Titan's upper atmosphere in the altitude range from 500 to 1000 km. This region is the key to a bett…
Multiwavelength study of the G345.5+1.5 region
Zavagno, A.; Hervías-Caimapo, C.; Bronfman, L. +4 more
Context. The star formation process requires the dust and gas present in the Milky Way to self-assemble into dense reservoirs of neutral material where the new generation of stars will emerge. Star-forming regions are usually studied in the context of Galactic surveys, but dedicated observations are sometimes needed when the study reaches beyond t…
Evidence for a TDE origin of the radio transient Cygnus A-2
Reynolds, C. S.; Rowlinson, A.; Siemiginowska, A. +3 more
In 2015, a radio transient named Cygnus A-2 was discovered in Cygnus A with the Very Large Array. Because of its radio brightness (νFν ≈ 6 × 1039 erg s-1), this transient likely represents a secondary black hole in orbit around the active galactic nucleus. Using Chandra ACIS observations from 2015 to 2017, we have …
Difference of source regions between fast and slow coronal mass ejections
Filippov, B.
Coronal mass ejections (CMEs) are tightly related to filament eruptions and usually are their continuation in the upper solar corona. It is common practice to divide all observed CMEs into fast and slow ones. Fast CMEs usually follow eruptive events in active regions near big sunspot groups and associated with major solar flares. Slow CMEs are mor…
The GALAH survey: unresolved triple Sun-like stars discovered by the Gaia mission
Lewis, Geraint F.; Ting, Yuan-Sen; Buder, Sven +17 more
The latest Gaia data release enables us to accurately identify stars that are more luminous than would be expected on the basis of their spectral type and distance. During an investigation of the 329 best solar twin candidates uncovered among the spectra acquired by the GALAH survey, we identified 64 such overluminous stars. In order to investigat…
The Quadratic Programming Method for Extracting Emission Line Maps from Line-blended Narrowband Images
Mito, Hiroyuki; Nakada, Yoshikazu; Ueta, Toshiya +3 more
We present a method to separate blended line emission from a set of narrowband (NB) images whose distinct throughput profiles overlap with each other. This method, based on the principle of quadratic programming (QP), treats line blending as a linearly constrained quadratic optimization problem and finds the solution by imposing a condition that t…
Bright Southern Variable Stars in the bRing Survey
Ireland, Michael J.; Bailey, John I., III; Kenworthy, Matthew A. +9 more
In addition to monitoring the bright star β Pic during the near-transit event for its giant exoplanet, the β Pictoris b Ring (bRing) observatories at Siding Springs Observatory, Australia and Sutherland, South Africa have monitored the brightnesses of bright stars (V ≃ 4-8 mag) centered on the south celestial pole (δ ≤ -30°) for approximately two …
Spectral characterization of newly detected young substellar binaries with SINFONI
Calissendorff, Per; Janson, Markus; Köhler, Rainer +1 more
We observe 14 young low-mass substellar objects using the VLT/SINFONI integral field spectrograph with laser guide star adaptive optics to detect and characterize three candidate binary systems. All three binary candidates show strong signs of youth, with two of them likely belonging to young moving groups. Together with the adopted young-moving-g…
The new 4‑m robotic telescope
Rebolo, R.; Steele, I. A.; Harvey, E. +9 more
We present a project to build a 4‑m‑diameter telescope (New Robotic Telescope [NRT]) with fully robotic operation. The telescope will be sited at the Observatory of Roque de los Muchachos in the island of La Palma (Spain). When it enters into operation in 5 years' time, it will be likely the largest robotic telescope in the world. This, in conjunc…