Search Publications
No evidence for Lyman α emission in spectroscopy of z > 7 candidate galaxies
Wilkins, Stephen M.; Bunker, Andrew J.; Caruana, Joseph +5 more
We present Gemini/Gemini Near Infrared Spectrograph (GNIRS) spectroscopic observations of four z-band (z ≈ 7) dropout galaxies and Very Large Telescope (VLT)/XSHOOTER observations of one z-band dropout and three Y-band (z ≈ 8-9) dropout galaxies in the Hubble Ultra Deep Field, which were selected with Wide Field Camera 3 imaging on the Hubble Spac…
Detection of Elements at All Three r-process Peaks in the Metal-poor Star HD 160617
Roederer, Ian U.; Lawler, James E.
We report the first detection of elements at all three r-process peaks in the metal-poor halo star HD 160617. These elements include arsenic and selenium, which have not been detected previously in halo stars, and the elements tellurium, osmium, iridium, and platinum, which have been detected previously. Absorption lines of these elements are foun…
On the nature of the galactic early-B hypergiants
Howarth, I. D.; Urbaneja, M. A.; Negueruela, I. +3 more
Aims: Despite their importance to a number of astrophysical fields, the lifecycles of very massive stars are still poorly defined. In order to address this shortcoming, we present a detailed quantitative study of the physical properties of four early-B hypergiants (BHGs) of spectral type B1-4 Ia+; Cyg OB2 #12, ζ1 Sco, HD…
Far-infrared colours of nearby late-type galaxies in the Herschel Reference Survey
Clements, D. L.; Ciesla, L.; Buat, V. +21 more
We study the far infrared (60-500 µm) colours of late-type galaxies in the Herschel Reference Survey, a K-band selected, volume limited sample of nearby galaxies. The far infrared colours are correlated with each other, with tighter correlations for the indices that are closer in wavelength. We also compare the different colour indices to va…
Structure and Dynamics of the Magnetopause and Its Boundary Layers
Hasegawa, Hiroshi
The magnetopause is the key region in space for the transfer of solar wind mass, momentum, and energy into the magnetosphere. During the last decade, our understanding of the structure and dynamics of Earth's magnetopause and its boundary layers has advanced considerably, thanks largely to the advent of multi-spacecraft missions such as Cluster an…
Herschel-ATLAS: Toward a Sample of ~1000 Strongly Lensed Galaxies
Rodighiero, G.; Frayer, D. T.; Sutherland, W. +39 more
While the selection of strongly lensed galaxies (SLGs) with 500 µm flux density S 500 > 100 mJy has proven to be rather straightforward, for many applications it is important to analyze samples larger than the ones obtained when confining ourselves to such a bright limit. Moreover, only by probing to fainter flux densities is i…
3D simulations of Betelgeuse's bow shock
Langer, N.; Mohamed, S.; Mackey, J.
Betelgeuse, the bright, cool red supergiant in Orion, is moving supersonically relative to the local interstellar medium. The star emits a powerful stellar wind that collides with this medium, forming a cometary structure, a bow shock, pointing in the direction of motion. We present the first 3D hydrodynamic simulations of the formation and evolut…
X-ray and ultraviolet investigation into the magnetic connectivity of a solar flare
Aulanier, G.; Pariat, E.; Vilmer, N. +1 more
We investigate the X-ray and UV emission detected by RHESSI and TRACE in the context of a solar flare on the 16th November 2002 with the goal of better understanding the evolution of the flare. We analysed the characteristics of the X-ray emission in the 12-25 and 25-50 keV energy range while we looked at the UV emission at 1600 Å . The flare appe…
Observations and Magnetic Field Modeling of a Solar Polar Crown Prominence
van Ballegooijen, Adriaan; Su, Yingna
We present observations and magnetic field modeling of the large polar crown prominence that erupted on 2010 December 6. Combination of Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) and STEREO_Behind/EUVI allows us to see the fine structures of this prominence both at the limb and on the disk. We focus on the structures and d…
Dynamics of starbursting dwarf galaxies: I Zw 18
Fraternali, F.; Lelli, F.; Verheijen, M. +1 more
I Zw 18 is a prototype blue compact dwarf (BCD) galaxy, characterized by a strong starburst and extremely low metallicity (Z ~ 0.02 Z⊙). It has long been considered a candidate young galaxy in the Local Universe, but recent studies have found that it contains old stars. We analysed archival VLA observations of the 21 cm line and found t…