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Is FS Tau B Driving an Asymmetric Jet?
Ohashi, Nagayoshi; Pyo, Tae-Soo; Liu, Chun-Fan +6 more
FS Tau B is one of the few T Tauri stars that possess a jet and a counterjet as well as an optically visible cavity wall. We obtained images and spectra of its jet-cavity system in the near-infrared H and K bands using the Subaru/Infrared Camera and Spectrograph and detected the jet and the counterjet in the [Fe II] 1.644 µm line for the fir…
The reflectivity spectrum and opposition effect of Titan's surface observed by Huygens' DISR spectrometers
Karkoschka, Erich; Schröder, Stefan E.; Tomasko, Martin G. +1 more
We determined Titan's reflectivity spectrum near the Huygens' landing site from observations taken with the Descent Imager/Spectral Radiometer below 500 m altitude, in particular the downward-looking photometer and spectrometers. We distinguish signal coming from illumination by sunlight and the lamp onboard Huygens based on their different spectr…
Inverse Compton X-Ray Halos around High-z Radio Galaxies: A Feedback Mechanism Powered by Far-infrared Starbursts or the Cosmic Microwave Background?
Lehmer, B. D.; Smail, Ian; Alexander, D. M. +1 more
We report the detection of extended X-ray emission around two powerful radio galaxies at z ~ 3.6 (4C 03.24 and 4C 19.71) and use these to investigate the origin of extended, inverse Compton (IC) powered X-ray halos at high redshifts. The halos have X-ray luminosities of L X ~ 3 × 1044 erg s-1 and sizes of ~60 kpc. …
Electron cross talk and asymmetric electron distributions near the Earth's bowshock
Schwartz, S. J.; Auster, U.; Mitchell, J. J.
Electron distributions in the magnetosheath display a number of far from equilibrium features. It has been suggested that one factor influencing these distributions may be the large distances separating locations at which electrons with different energies and pitch angles must cross the bowshock in order to reach a given point in the magnetosheath…
Structural asymmetry in martian impact craters as an indicator for an impact trajectory
Kenkmann, T.; Wulf, G.; Poelchau, M. H.
Impact crater formation is a highly dynamic and complex geological phenomenon. Methods of structural geology are capable of giving insights into deformation processes that occur during cratering. While most deformation observed in craters exhibits a generally radial symmetry, recent discoveries of non-radial structural elements in the central upli…
Detecting Variability in Massive Astronomical Time-series Data. II. Variable Candidates in the Northern Sky Variability Survey
Chang, Seo-Won; Kim, Dae-Won; Byun, Yong-Ik +2 more
We present variability analysis of data from the Northern Sky Variability Survey (NSVS). Using the clustering method, which defines variable candidates as outliers from large clusters, we cluster 16,189,040 light curves having data points at more than 15 epochs as variable and non-variable candidates in 638 NSVS fields. Variable candidates are sel…
Parametrization effects in the analysis of AMI Sunyaev-Zel'dovich observations
AMI Consortium; Olamaie, Malak; Rodríguez-Gonzálvez, Carmen +16 more
Most Sunyaev-Zel'dovich (SZ) and X-ray analyses of galaxy clusters try to constrain the cluster total mass (MT(r)) and/or gas mass (Mg(r)) using parametrized models derived from both simulations and imaging observations, and assumptions of spherical symmetry and hydrostatic equilibrium. By numerically exploring the probabilit…
The ChaMPlane Bright X-Ray Sources—Galactic Longitudes l = 2°-358°
Penner, Kyle; Laycock, Silas; van den Berg, Maureen +4 more
The Chandra Multi-wavelength Plane (ChaMPlane) survey aims to constrain the Galactic population of mainly accretion-powered, but also coronal, low-luminosity X-ray sources (L X <~ 1033 erg s-1). To investigate the X-ray source content in the plane at fluxes F X >~ 3 × 10-14 erg s-1<…
The Suzaku X-ray spectrum of NGC 3147. Further insights on the best "true" Seyfert 2 galaxy candidate
Bianchi, S.; Guainazzi, M.; Barcons, X. +2 more
Context. NGC 3147 is so far the most convincing case of a "true" Seyfert 2 galaxy, i.e. a source genuinely lacking the broad line regions.
Aims: We obtained a Suzaku observation with the double aim to study in more detail the iron line complex, and to check the Compton-thick hypothesis for the lack of observed optical broad lines.
Method…
The unseen population of F- to K-type companions to hot subdwarf stars
Gänsicke, B. T.; Heber, U.; Breedt, E. +6 more
We present a method to select hot subdwarf stars with A- to M-type companions using photometric selection criteria. We cover a wide range in wavelength by combining Galaxy Evolution Explorer (GALEX) ultraviolet data, optical photometry from the Sloan Digital Sky Survey (SDSS) and the Carlsberg Meridian Telescope, near-infrared data from Two-Micron…