Search Publications
The ultraluminous X-ray source HoII X-1: kinematic evidence of its escape from a cluster
Egorov, Oleg V.; Lozinskaya, Tatiana A.; Moiseev, Alexei V.
We analyse the structure and kinematics of ionized gas in the vicinity of the ultraluminous X-ray source (ULX) HoII X-1 in the Holmberg II galaxy using observational data obtained with a scanning Fabry-Perot interferometer in the Hα, [S II] and [O III] emission lines at the Russian 6-m telescope. Decomposition of the line profiles allows us to ide…
Nature of the warm absorber outflow in NGC 4051
Ebisawa, Ken; Mizumoto, Misaki
The narrow-line Seyfert 1 galaxy NGC 4051 is known to exhibit significant X-ray spectral/flux variations and have a number of emission/absorption features. X-ray observations have revealed that these absorption features are blueshifted, which indicates that NGC 4051 has warm absorber outflow. In order to constrain physical parameters of the warm a…
Fluxgate magnetometer offset vector determination by the 3D mirror mode method
Dougherty, M. K.; Glassmeier, K. -H.; Volwerk, M. +5 more
Fluxgate magnetometers on-board spacecraft need to be regularly calibrated in flight. In low fields, the most important calibration parameters are the three offset vector components, which represent the magnetometer measurements in vanishing ambient magnetic fields. In case of three-axis stabilized spacecraft, a few methods exist to determine offs…
Antisolar differential rotation with surface lithium enrichment on the single K-giant V1192 Orionis
Strassmeier, K. G.; Weber, M.; Granzer, T. +7 more
Context. Stars with about 1-2 solar masses at the red giant branch (RGB) represent an intriguing period of stellar evolution, I.e. when the convective envelope interacts with the fast-rotating core. During these mixing episodes freshly synthesized lithium can come up to the stellar surface along with high angular momentum material. This high angul…
Review article: Wave analysis methods for space plasma experiment
Narita, Yasuhito
A review of analysis methods is given on quasi-monochromatic waves, turbulent fluctuations, and wave-wave and wave-particle interactions for single-spacecraft data in situ in near-Earth space and interplanetary space, in particular using magnetic field and electric field data. Energy spectra for different components of the fluctuating fields, mini…
Constraining Accretion Signatures of Exoplanets in the TW Hya Transitional Disk
Tamura, Motohide; Uyama, Taichi; Hashimoto, Jun +4 more
We present a near-infrared direct imaging search for accretion signatures of possible protoplanets around the young stellar object (YSO) TW Hya, a multi-ring disk exhibiting evidence of planet formation. The Paβ line (1.282 µm) is an indication of accretion onto a protoplanet, and its intensity is much higher than that of blackbody radiation…
MAVEN and the total electron content of the Martian ionosphere
Leblanc, François; Chaufray, Jean-Yves; Forget, François +13 more
Model studies of the ionosphere of Mars under daytime conditions reveal that for solar zenith angles of 0°-40°, the shapes and magnitudes of the electron density profiles Ne(h) change by only small amounts. This suggests that midday observations made by MAVEN instruments along slanted orbit segments can be used to represent vertical pro…
Simultaneous Multiwavelength Observations of V404 Cygni during its 2015 June Outburst Decay Strengthen the Case for an Extremely Energetic Jet-base
Maccarone, Thomas J.; Grinberg, Victoria; Reynolds, Mark T. +4 more
We present results of multiband optical photometry of the black hole X-ray binary system V404 Cyg obtained using Wheaton College Observatory’s 0.3 m telescope, along with strictly simultaneous INTEGRAL and Swift observations during 2015 June 25.15-26.33 UT, and 2015 June 27.10-27.34 UT. These observations were made during the 2015 June outburst of…
Reverberation Mapping of PG 0934+013 with the Southern African Large Telescope
Barth, Aaron J.; Im, Myungshin; Jeon, Yiseul +10 more
We present the variability and time-lag measurements of PG 0934+013 based on a photometric and spectroscopic monitoring campaign over a two year period. We obtained 46 epochs of data from the spectroscopic campaign, which was carried out using the Southern African Large Telescope with ∼1 week cadence over two sets of four month-long observing peri…
Wayne—A Simulator for HST WFC3 IR Grism Spectroscopy
Tsiaras, A.; Varley, R.; Karpouzas, K.
Wayne is an algorithm that simulates Hubble Space Telescope Wide Field Camera 3 (WFC3) grism spectroscopic frames, including sources of noise and systematics. It can simulate both staring and spatial scan modes, and observations such as the transit and the eclipse of an exoplanet. Unlike many other instrument simulators, the focus of Wayne is on c…