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Evidence for Type Ia Supernova Diversity from Ultraviolet Observations with the Hubble Space Telescope
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Maoz, Dan +93 more
We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Surveys on the Hubble Space Telescope. This data set provides unique spectral time series down to 2000 Å. Significant diversity is seen in the near-maximum-light spectra (~…
Through the Looking Glass: Bright, Highly Magnified Galaxy Candidates at z ~ 7 behind A1703
Ford, H. C.; Zheng, W.; Zitrin, A. +7 more
We report the discovery of seven strongly lensed Lyman-break galaxy (LBG) candidates at z ~ 7 detected in Hubble Space Telescope Wide Field Camera 3 (WFC3) imaging of A1703. The brightest candidate, called A1703-zD1, has an observed (lensed) magnitude of 24.0 AB (26σ) in the WFC3/IR F160W band, making it 0.2 mag brighter than the z 850-…
Water vapor near the cloud tops of Venus from Venus Express/VIRTIS dayside data
Drossart, P.; Piccioni, G.; Grassi, D. +3 more
Observations of the dayside of Venus performed by the high spectral resolution channel (-H) of the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on board the ESA Venus Express mission have been used to measure the altitude of the cloud tops and the water vapor abundance around this level with a spatial resolution ranging from 100 to 1…
Near-infrared Imaging of a z = 6.42 Quasar Host Galaxy with the Hubble Space Telescope Wide Field Camera 3
Ryan, R. E.; Koekemoer, A. M.; Fan, X. +12 more
We report on deep near-infrared F125W (J) and F160W (H) Hubble Space Telescope Wide Field Camera 3 images of the z = 6.42 quasar J1148+5251 to attempt to detect rest-frame near-ultraviolet emission from the host galaxy. These observations included contemporaneous observations of a nearby star of similar near-infrared colors to measure temporal var…
Double Bow Shocks around Young, Runaway Red Supergiants: Application to Betelgeuse
Langer, Norbert; Neilson, Hilding R.; Mackey, Jonathan +2 more
A significant fraction of massive stars are moving supersonically through the interstellar medium (ISM), either due to disruption of a binary system or ejection from their parent star cluster. The interaction of their wind with the ISM produces a bow shock. In late evolutionary stages these stars may undergo rapid transitions from red to blue and …
Expansion of magnetic clouds in the outer heliosphere
Rodriguez, L.; Gulisano, A. M.; Démoulin, P. +1 more
Context. A large amount of magnetized plasma is frequently ejected from the Sun as coronal mass ejections (CMEs). Some of these ejections are detected in the solar wind as magnetic clouds (MCs) that have flux rope signatures.
Aims: Magnetic clouds are structures that typically expand in the inner heliosphere. We derive the expansion propertie…
Guiding Nonlinear Force-free Modeling Using Coronal Observations: First Results Using a Quasi-Grad-Rubin Scheme
Schrijver, C. J.; Wheatland, M. S.; Malanushenko, A. +2 more
At present, many models of the coronal magnetic field rely on photospheric vector magnetograms, but these data have been shown to be problematic as the sole boundary information for nonlinear force-free field extrapolations. Magnetic fields in the corona manifest themselves in high-energy images (X-rays and EUV) in the shapes of coronal loops, pro…
The geomorphology of (21) Lutetia: Results from the OSIRIS imaging system onboard ESA's Rosetta spacecraft
Jorda, L.; Stephan, K.; Lamy, P. +27 more
The surface of (21) Lutetia is highly complex with significant interactions between ancient and more recent structures. This work attempts to summarize the surface geomorphology observed using the high resolution images from OSIRIS, the imaging system onboard the European Space Agency's Rosetta spacecraft. A wide range of surface morphologies are …
The relationship between γ Cassiopeiae's X-ray emission and its circumstellar environment
Motch, C.; Pollmann, E.; Smith, M. A. +17 more
γ Cas is the prototypical classical Be star and is recently best known for its variable hard X-ray emission. To elucidate the reasons for this emission, we mounted a multiwavelength campaign in 2010 centered around four XMM-Newton observations. The observational techniques included long baseline optical interferometry (LBOI) from two instruments a…
VLA imaging of 12CO J = 1-0 and free-free emission in lensed submillimetre galaxies
Thomson, A. P.; Kneib, J. -P.; Ivison, R. J. +7 more
We present a study using the Karl G. Jansky Very Large Array (VLA) of 12CO J = 1-0 emission in three strongly lensed submillimetre-selected galaxies (SMM J16359, SMM J14009 and SMM J02399) at z = 2.5-2.9. These galaxies span LIR = 1011-1013 L⊙, offering an opportunity to compare the interstell…