Search Publications
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…
Relativistic Fe Kα line in the composite X-ray spectra of radio-loud active galactic nuclei
Jin, Chichuan; Liu, Zhu; Yuan, Weimin +1 more
While a broad Fe Kα emission line is generally found in the X-ray spectra of radio quiet (RQ) active galactic nuclei (AGNs), this feature, commonly thought to be broadened by the relativistic effects near the central black hole, appears to be rare in their radio loud (RL) counterparts. In this paper, we carry out a detailed study of the ensemble p…
Propagation of Solar Energetic Particles in the Outer Heliosphere: Interplay between Scattering and Adiabatic Focusing
Wan, W.; He, H. -Q.
The turbulence and spatial nonuniformity of the guide magnetic field cause two competitive effects, namely, the scattering effect and the adiabatic focusing effect, respectively. In this work, we numerically solve the five-dimensional Fokker-Planck transport equation to investigate the radial evolutions of these important effects undergone by the …
Potential role of energetic particle observations in geomagnetic storm forecasting
Valtonen, Eino; Ameri, Dheyaa
We have searched for solar proton events consisting of both solar energetic particles (SEPs) accelerated near the Sun and energetic storm particles (ESPs) accelerated by interplanetary shocks driven by coronal mass ejections (CMEs) and observed near the time when the shock passes the observer. The purpose of this study is to investigate the possib…
The 3XMM/SDSS Stripe 82 Galaxy Cluster Survey - II. X-ray and optical properties of the cluster sample
Plat, Adèle; Márquez, Isabel; Durret, Florence +3 more
We present X-ray and optical properties of the optically confirmed galaxy cluster sample from the 3XMM/SDSS Stripe 82 cluster survey. The sample includes 54 galaxy clusters in the redshift range of 0.05-1.2, with a median redshift of 0.36. We first present the X-ray temperature and luminosity measurements that are used to investigate the X-ray lum…
Constraining the Active Galactic Nucleus and Starburst Properties of the IR-luminous Quasar Host Galaxy APM08279+5255 at Redshift 4 with SOFIA
Casey, Caitlin M.; Staguhn, Johannes; Dowell, C. Darren +3 more
We present far-IR photometry and the infrared spectrum of the z = 3.9114 quasar/starburst composite system APM 08279+5255, obtained using the Stratospheric Observatory for Infrared Astronomy (SOFIA)/High-resolution Airborne Wideband Camera+ (HAWC+) and the Spitzer Space Telescope Infrared Spectrograph. We decompose the IR-to-radio spectral energy …