Search Publications
A new three-dimensional magnetopause model with a support vector regression machine and a large database of multiple spacecraft observations
Wang, Y.; Merka, J.; Šafránková, J. +6 more
We present results from a new three-dimensional empirical magnetopause model based on 15,089 magnetopause crossings from 23 spacecraft. To construct the model, we introduce a Support Vector Regression Machine (SVRM) technique with a systematic approach that balances model smoothness with fitting accuracy to produce a model that reveals the manner …
The Magnetic Systems Triggering the M6.6 Class Solar Flare in NOAA Active Region 11158
Toriumi, Shin; Kusano, Kanya; Inoue, Satoshi +3 more
We report a detailed event analysis of the M6.6 class flare in the active region (AR) NOAA 11158 on 2011 February 13. AR 11158, which consisted of two major emerging bipoles, showed prominent activity including one X- and several M-class flares. In order to investigate the magnetic structures related to the M6.6 event, particularly the formation p…
An X-Ray Detected Group of Quiescent Early-Type Galaxies at z = 1.6 in the Chandra Deep Field South
Brandt, William N.; Mulchaey, John S.; Ueda, Yoshihiro +6 more
We report the discovery of an X-ray group of galaxies located at a high redshift of
Characteristics of pebble- and cobble-sized clasts along the Curiosity rover traverse from Bradbury Landing to Rocknest
Mangold, N.; Garvin, J.; Deen, R. G. +23 more
have assessed the characteristics of clasts along Curiosity's traverse to shed light on the processes important in the genesis, modification, and transportation of surface materials. Pebble- to cobble-sized clasts at Bradbury Landing, and subsequently along Curiosity's traverse to Yellowknife Bay, reflect a mixing of two end-member transport mecha…
On the shear estimation bias induced by the spatial variation of colour across galaxy profiles
Schrabback, T.; Huang, Z.; Hoekstra, H. +13 more
The spatial variation of the colour of a galaxy may introduce a bias in the measurement of its shape if the point spread function (PSF) profile depends on wavelength. We study how this bias depends on the properties of the PSF and the galaxies themselves. The bias depends on the scales used to estimate the shape, which may be used to optimize meth…
Young stars in ɛ Chamaleontis and their disks: disk evolution in sparse associations
Henning, Th.; van Boekel, R.; Lawson, W. A. +3 more
Context. The nearby young stellar association ɛ Cha has an estimated age of 3-5 Myr, making it an ideal laboratory to study the disk dissipation process and provide empirical constraints on the timescale of planet formation.
Aims: We wish to complement existing optical and near-infrared data of the ɛ Cha association, which provide the stellar…
Photochemical activity of Titan’s low-altitude condensed haze
Gudipati, Murthy S.; Allen, Mark; Jacovi, Ronen +2 more
Titan, the largest moon of Saturn and similar to Earth in many aspects, has unique orange-yellow colour that comes from its atmospheric haze, whose formation and dynamics are far from well understood. Present models assume that Titan’s tholin-like haze formation occurs high in atmosphere through gas-phase chemical reactions initiated by high-energ…
Planck intermediate results. IV. The XMM-Newton validation programme for new Planck galaxy clusters
Böhringer, H.; Kneissl, R.; Dahle, H. +191 more
We present the final results from the XMM-Newton validation follow-up of new Planck galaxy cluster candidates. We observed 15 new candidates, detected with signal-to-noise ratios between 4.0 and 6.1 in the 15.5-month nominal Planck survey. The candidates were selected using ancillary data flags derived from the ROSAT All Sky Survey (RASS) and Digi…
A Super-solar Metallicity for the Progenitor of Kepler's Supernova
Hughes, John P.; Lee, Jae-Joon; Mori, Koji +8 more
We have performed deep X-ray observations of the remnant of Kepler's supernova (SN 1604) as a Key Project of the Suzaku Observatory. Our main goal is to detect secondary Fe-peak elements in the supernova (SN) ejecta to gain insights into the Type Ia SN explosion mechanism and the nature of the progenitor. Here, we report our initial results. We ma…
Gas and dust in the TW Hydrae association as seen by the Herschel Space Observatory
Pinte, C.; Duchêne, G.; Dent, W. R. F. +15 more
Context. Circumstellar discs are the places where planets form, therefore knowledge of their evolution is crucial for our understanding of planet formation. The Herschel Space Observatory is providing valuable data for studying disc systems, thanks to its sensitivity and wavelength coverage. This paper is one of several devoted to analysing and mo…