Search Publications
Temperature estimation from hydroxyl airglow emission in the Venus night side mesosphere
Drossart, P.; Piccioni, G.; Gérard, J. -C. +3 more
The temperature of the night side of Venus at about 95 km has been determined by using spectral features of the hydroxyl airglow emission around 3 µm, recorded from July 2006 to July 2008 by VIRTIS onboard Venus Express. The retrieved temperatures vary from 145.5 to about 198.1 K with an average value of 176.3 ± 14.3 K and are in good agreem…
Calvera: A Low-mass Strangeon Star Torqued by Debris Disk?
Ge, Mingyu; Xu, Renxin; Li, Yunyang +3 more
Calvera is a unique 59 {ms} isolated pulsar, because it cannot be detected by radio, optical, and gamma-rays; however, it is detectable through the purely thermal emission in soft X-rays. It is suggested that Calvera could be an ordinary middle-aged pulsar with significant magnetospheric activity at a large distance. Alternatively, it is proposed …
Data trove helps pin down the shape of the Milky Way
Clery, Daniel
On 25 April, hundreds of astronomers around the world got their hands on one of the biggest data dumps in the history of astronomy: the exact positions, motions, brightnesses, and colors of 1.3 billion stars in and around the Milky Way, gathered during the first 2 years of operation by the European Space Agency's €750 million Gaia satellite, launc…
Matching CCD images to a stellar catalog using locality-sensitive hashing
Liu, Bo; Peng, Qing-Yu; Yu, Jia-Zong
The usage of a subset of observed stars in a CCD image to find their corresponding matched stars in a stellar catalog is an important issue in astronomical research. Subgraph isomorphic-based algorithms are the most widely used methods in star catalog matching. When more subgraph features are provided, the CCD images are recognized better. However…
Kinematic Identification of Young Nearby Moving Groups from a Sample of Chromospherically Active Stars in the RAVE Catalog
Suárez, Genaro; Aguilar, Luis; Downes, Juan José +2 more
The purpose of this study is the identification of young (1 < age < 100 Myr), nearby (d ≤ 100 pc) moving groups (YNMGs) through their kinematic signature. YNMGs could be the result of the recent dispersal of young embedded clusters, such that they still represent kinematically cold groups, carrying the residual motion of their parental cloud…
VLBA Observations of Strong Anisotripic Radio Scattering Toward the Orion Nebula
Kounkel, Marina; Rodríguez, Luis F.; Loinard, Laurent +6 more
We present observations of VLBA 20, a radio source found toward the edge of the Orion Nebula Cluster (ONC). Nonthermal emission dominates the spectral energy distribution of this object from the radio to mid-infrared regime, suggesting that VLBA 20 is extragalactic. This source is heavily scattered in the radio regime. Very Long Baseline Array obs…
Accidental deep field bias in CMB T and SNe z correlation
Friday, Tracey; Clowes, Roger G.; Raghunathan, Srinivasan +1 more
Evidence presented by Yershov, Orlov, and Raikov apparently showed that the WMAP/Planck cosmic microwave background (CMB) pixel-temperatures (T) at supernovae (SNe) locations tend to increase with increasing redshift (z). They suggest this correlation could be caused by the Integrated Sachs-Wolfe effect and/or by some unrelated foreground emission…
The Berlin Exoplanet Search Telescope. II. Catalog of Variable Stars. III. Census of Variable Stars in a Puppis Field
Erikson, A.; Rauer, H.; Csizmadia, Sz. +5 more
The Berlin Exoplanet Search Telescope II (BEST II) is a ground-based, small aperture, wide-angle telescope used to search for stellar light variations in the southern hemisphere. We report the results of a monitoring campaign observing a field in the Puppis constellation in late 2011/early 2012. Light curves were obtained for 130,472 stars, out of…
Kinematic Groups in the Corona of the Ursa Majoris Flow Indicated by Gaia Data
Vereshchagin, S. V.; Chupina, N. V.; Postnikova, E. S.
The internal kinematics of the Ursa Majoris stellar flow is considered. The details of the flow structure are considered, and new candidate members are searched for using high-precision Gaia DR1 TGAS data. The flow structure is studied using apex diagrams, which have been shown to be effective in studies of open clusters. To select member-stars of…
Numerical Simulation of the Flow over a Segment-Conical Body on the Basis of Reynolds Equations
Egorov, I. V.; Novikov, A. V.; Palchekovskaya, N. V.
Numerical simulation was used to study the 3D supersonic flow over a segment-conical body similar in shape to the ExoMars space vehicle. The nonmonotone behavior of the normal force acting on the body placed in a supersonic gas flow was analyzed depending on the angle of attack. The simulation was based on the numerical solution of the unsteady Re…