Search Publications
A Spectroscopic Orbit for the Late-type Be Star β CMi
Wang, Luqian; Klement, Robert; Richardson, Noel D. +12 more
The late-type Be star β CMi is remarkably stable compared to other Be stars that have been studied. This has led to a realistic model of the outflowing Be disk by Klement et al. These results showed that the disk is likely truncated at a finite radius from the star, which Klement et al. suggest is evidence for an unseen binary companion in orbit. …
XMM-Newton observations of the non-thermal supernova remnant HESS J1731-347 (G353.6-0.7)
Klochkov, D.; Santangelo, A.; Pühlhofer, G. +4 more
We report on the analysis of XMM-Newton observations of the non-thermal shell-type supernova remnant HESS J1731-347 (G353.6-0.7). For the first time the complete remnant shell has been covered in X-rays, which allowed direct comparison with radio and TeV observations. We carried out a spatially resolved spectral analysis of XMM-Newton data and con…
Evolution of Dust-obscured Star Formation and Gas to z = 2.2 from HiZELS
Thomson, A. P.; Smail, Ian; Ibar, E. +6 more
We investigate the far-infrared (far-IR) properties of galaxies selected via deep, narrow-band imaging of the Hα emission line in four redshift slices from z=0.40{--}2.23 over ∼1 deg2 as part of the High-redshift Emission Line Survey (HiZELS). We use a stacking approach in the Herschel PACS/SPIRE far-IR bands, along with 850 µ {{m…
Gaia TGAS search for Large Magellanic Cloud runaway supergiant stars. Candidate hypervelocity star discovery and the nature of R 71
van der Marel, Roeland P.; Lennon, Daniel J.; Sahlmann, Johannes +2 more
Aims: Our research aims to search for runaway stars in the Large Magellanic Cloud (LMC) among the bright Hipparcos supergiant stars included in the Gaia DR1 Tycho-Gaia astrometric solution (TGAS) catalogue.
Methods: We compute the space velocities of the visually brightest stars in the Large Magellanic Cloud that are included in the TGAS…
High-resolution Observations of a White-light Flare with NST
Cho, K. -S.; Xu, Y.; Yurchyshyn, V. +4 more
Using high-resolution data from the New Solar Telescope, we studied fine spatial and temporal details of an M1.3 white-light (WL) flare, which was one of three homologous solar flares (C6.8, M1.3, and M2.3) observed in close proximity to the west solar limb on 2014 October 29 in NOAA active region 12192. We report that the TiO WL flare consists of…
Apparent and Intrinsic Evolution of Active Region Upflows
Janvier, Miho; Baker, Deborah; Démoulin, Pascal +1 more
We analyze the evolution of Fe XII coronal plasma upflows from the edges of ten active regions (ARs) as they cross the solar disk using the Hinode Extreme Ultraviolet Imaging Spectrometer (EIS) to do this. Confirming the results of Démoulin et al. (Sol. Phys.283, 341, 2013), we find that for each AR there is an observed long-term evolution of the …
Development of a Full Ice-cream Cone Model for Halo Coronal Mass Ejections
Moon, Y. -J.; Lee, Harim; Na, Hyeonock
It is essential to determine three-dimensional parameters (e.g., radial speed, angular width, and source location) of coronal mass ejections (CMEs) for the space weather forecast. In this study, we investigate which cone type represents a halo CME morphology using 29 CMEs (12 Solar and Heliospheric Observatory (SOHO)/Large Angle and Spectrometric …
First detection of the 448 GHz H2O transition in space
Rigopoulou, D.; Colina, L.; Martín-Pintado, J. +9 more
We present the first detection of the ortho-H2O 423 - 330 transition at 448 GHz in space. We observed this transition in the local (z = 0.010) luminous infrared (IR) galaxy ESO 320-G030 (IRAS F11506-3851) using the Atacama Large Millimeter/submillimeter Array (ALMA). The water 423 - 330 emissi…
On the Binary Nature of Massive Blue Hypergiants: High-resolution X-Ray Spectroscopy Suggests That Cyg OB2 12 is a Colliding Wind Binary
Hamann, W. -R.; Oskinova, L. M.; Ignace, R. +5 more
The blue hypergiant Cyg OB2 12 (B3Ia+) is a representative member of the class of very massive stars in a poorly understood evolutionary stage. We obtained its high-resolution X-ray spectrum using the Chandra observatory. PoWR model atmospheres were calculated to provide realistic wind opacities and to establish the wind density structu…
The First Detection of a Pulsar with ALMA
de Luca, A.; Possenti, A.; Burgay, M. +8 more
Although there is a general consensus on the fact that pulsars’ radio emission is coherent in nature, whereas the emission from the optical to high-energy γ-rays is due to incoherent processes, it has not been established yet at which wavelengths the transition occurs, which is key information for all emission models of pulsar magnetospheres. Of c…