Search Publications
Stellar populations, stellar masses and the formation of galaxy bulges and discs at z < 3 in CANDELS
Kocevski, Dale D.; Conselice, Christopher J.; Mortlock, Alice +5 more
We present a multicomponent structural analysis of the internal structure of 1074 high-redshift massive galaxies at 1 < z < 3 from the CANDELS HST Survey. In particular, we examine galaxies best fitted by two structural components, and thus likely forming discs and bulges. We examine the stellar mass, star formation rates (SFRs) and colours …
The Strong Gravitationally Lensed Herschel Galaxy HLock01: Optical Spectroscopy Reveals a Close Galaxy Merger with Evidence of Inflowing Gas
Marques-Chaves, Rui; Clements, David L.; Cabrera-Lavers, Antonio +15 more
The submillimeter galaxy (SMG) HERMES J105751.1+573027 (hereafter HLock01) at z = 2.9574 ± 0.0001 is one of the brightest gravitationally lensed sources discovered in the Herschel Multi-tiered Extragalactic Survey. Apart from the high flux densities in the far-infrared, it is also extremely bright in the rest-frame ultraviolet (UV), with a total a…
Current Sheets in the Wake of an Eruption of Two Crossing Filaments
Zhang, Jun; Yang, Jiayan; Li, Leping +1 more
Employing Solar Dynamic Observatory/Atmospheric Imaging Assembly (AIA) multi-wavelength images, we study an eruption of two crossing filaments, and report for the first time the current sheets (CSs) connecting the lower flare ribbons and the upper erupting filaments. On 2014 July 8, two crossing filaments are observed in the NOAA active region 121…
The Globular Cluster NGC 6402 (M14). II. Variable Stars
Grundahl, F.; Catelan, M.; Smith, H. A. +2 more
We present time-series BVI photometry for the Galactic globular cluster NGC 6402 (M14). The data consist of ∼137 images per filter, obtained using the 0.9 and 1.0 m SMARTS telescopes at the Cerro Tololo Inter-American Observatory. The images were obtained during two observing runs in 2006-2007. The image-subtraction package ISIS, along with DAOPHO…
iPTF Survey for Cool Transients
Fox, O. D.; Cenko, S. B.; Sollerman, J. +25 more
We performed a wide-area (2000 deg2) g and I band experiment as part of a two month extension to the Intermediate Palomar Transient Factory. We discovered 36 extragalactic transients including iPTF17lf, a highly reddened local SN Ia, iPTF17bkj, a new member of the rare class of transitional Ibn/IIn supernovae, and iPTF17be, a candidate …
The local rotation curve of the Milky Way based on SEGUE and RAVE data
Watson, F.; Munari, U.; Steinmetz, M. +13 more
Aims: We construct the rotation curve of the Milky Way in the extended solar neighbourhood using a sample of Sloan Extension for Galactic Understanding and Exploration (SEGUE) G-dwarfs. We investigate the rotation curve shape for the presence of any peculiarities just outside the solar radius as has been reported by some authors.
Methods…
Observation of variable pre-eclipse dips and disc windsin the eclipsing LMXB XTE J1710-281
Maitra, Chandreyee; Paul, Biswajit; Raman, Gayathri
We report the first detection of highly ionized Fe species in the X-ray spectrum of the eclipsing and dipping Low-Mass X-ray Binary XTE J1710-281. Using archival Chandra and Suzaku observations, we have carried out a spectro-timing analysis of the source during three different epochs. We compare the average orbital profile and obtain differences i…
Review of guidance techniques for landing on small bodies
Simplício, Pedro; Marcos, Andrés; Joffre, Eric +2 more
A renewed scientific interest has been growing in the exploration of small asteroids in addition to larger planetary bodies such as Mars, since their weaker gravitational field makes them more easily accessible. However, such exploratory missions are very challenging from an engineering perspective, particularly when striving for optimal propellan…
A possible source mechanism for magnetotail current sheet flapping
Juusola, Liisa; Pfau-Kempf, Yann; Ganse, Urs +5 more
The origin of the flapping motions of the current sheet in the Earth's magnetotail is one of the most interesting questions of magnetospheric dynamics yet to be solved. We have used a polar plane simulation from the global hybrid-Vlasov model Vlasiator to study the characteristics and source of current sheet flapping in the center of the magnetota…
Compressive strength and elastic modulus at Agilkia on comet 67P/Churyumov-Gerasimenko derived from the SESAME/CASSE touchdown signals
Flandes, Alberto; Krüger, Harald; Arnold, Walter +8 more
We report an analysis of the Comet Acoustic Surface Sounding Experiment (CASSE) acceleration signals at Philae's first touchdown site Agilkia on comet 67P/Churyumov-Gerasimenko. The signals yield the forces in the contact zone foot-sole and comet surface, and from these forces a compression strength of approximately 10 kPa can be derived. The sole…