Search Publications
A search for the lenses in the Herschel Bright Sources (HerBS) sample
Eales, Stephen; Bakx, Tom J. L. C.; Amvrosiadis, Aristeidis
Verifying that sub-mm galaxies are gravitationally lensed requires time-expensive observations with oversubscribed high-resolution observatories. Here, we aim to strengthen the evidence of gravitational lensing within the Herschel Bright Sources (HerBS) by cross-comparing their positions to optical (SDSS) and near-infrared (VIKING) surveys, in ord…
Kinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2
Mao, Shude; Pietrukowicz, Pawel; Shen, Juntai +2 more
We analyse the kinematics and spatial distribution of 15 599 fundamental-mode RR Lyrae (RRL) stars in the Milky Way bulge by combining OGLE-IV photometric data and Gaia DR2 proper motions. We show that the longitudinal proper motions and the line-of-sight velocities can give similar results for the rotation in the Galactic central regions. The ang…
Is Extended Hard X-Ray Emission Ubiquitous in Compton-thick AGN?
Elvis, Martin; Risaliti, Guido; Fabbiano, G. +4 more
The recent Chandra discovery of extended ∼kiloparsec-scale hard (>3 keV) X-ray emission in nearby Compton-thick (CT) active galactic nuclei (AGN) opens a new window to improving AGN torus modeling and investigating how the central supermassive black hole interacts with and impacts the host galaxy. Since there are only a handful of detections so…
Inverse First Ionization Potential Effects in Giant Solar Flares Found from Earth X-Ray Albedo with Suzaku/XIS
Maeda, Yoshitomo; Katsuda, Satoru; Sato, Kosuke +21 more
We report X-ray spectroscopic results for four giant solar flares that occurred on 2005 September 7 (X17.0), 2005 September 8 (X5.4), 2005 September 9 (X6.2), and 2006 December 5 (X9.0), obtained from Earth albedo data with the X-ray Imaging Spectrometer (XIS) on board Suzaku. The good energy resolution of the XIS (FWHM ∼ 100 eV) enables us to sep…
Three discoveries of γ Cas analogues from dedicated XMM-Newton observations of Be stars
Smith, Myron A.; Nazé, Yaël; Torrejón, José M. +5 more
In the last years, a peculiarity of some Be stars - their association with unusually hard and intense X-ray emission - was shown to extend beyond a mere few cases. In this paper, we continue our search for new cases by performing a limited survey of 18 Be stars using XMM-Newton. The targets were selected either on the basis of a previous X-ray det…
Kalkayotl: A cluster distance inference code
Miret-Roig, N.; Bouy, H.; Casamiquela, L. +5 more
Context. The high-precision parallax data of the Gaia mission allows for significant improvements in the distance determination to stellar clusters and their stars. In order to obtain accurate and precise distance determinations, systematics such as parallax spatial correlations need to be accounted for, especially with regard to stars in small sk…
The Solar Neighborhood. XLVI. Revealing New M Dwarf Binaries and Their Orbital Architectures
Henry, Todd J.; Jao, Wei-Chun; Vrijmoet, Eliot Halley +1 more
We use 20 yr of astrometric data from the REsearch Consortium On Nearby Stars (RECONS) program on the Cerro Tololo Inter-American Observatory/SMARTS 0.9 m telescope to provide new insight into multiple star systems in the solar neighborhood. We provide new and updated parallaxes for 210 systems and derive nine high-quality astrometric orbits with …
Magnetosheath Jets and Plasmoids: Characteristics and Formation Mechanisms from Hybrid Simulations
Blanco-Cano, Xóchitl; Burgess, David; Trotta, Domenico +2 more
Magnetosheath jets and plasmoids are very common phenomena downstream of Earth's quasi-parallel bow shock. As the increase of the dynamic pressure is one of the principal characteristics of magnetosheath jets, the embedded paramagnetic plasmoids have been considered as an special case of the former. Although the properties of both types of structu…
SOFIA/FORCAST Galactic Center Legacy Survey: Overview
Morris, Mark R.; Longmore, Steven N.; García-Marín, Macarena +12 more
The Galactic Center contains some of the most extreme conditions for star formation in our Galaxy, as well as many other phenomena that are unique to this region. Given our relative proximity to the Galactic Center, we are able to study details of physical processes to a level that is simply not yet possible for more distant galaxies, yielding an …
Single magnetic white dwarfs with Balmer emission lines: a small class with consistent physical characteristics as possible signposts for close-in planetary companions
Gänsicke, Boris T.; Pala, Anna F.; Rodríguez-Gil, Pablo +4 more
We report the identification of SDSS J121929.45+471522.8 as the third apparently isolated magnetic (B ≃ 18.5 ± 1.0 MG) white dwarf exhibiting Zeeman-split Balmer emission lines. The star shows coherent variability at optical wavelengths with an amplitude of ≃0.03 mag and a period of 15.26 h, which we interpret as the spin period of the white dwarf…