Search Publications
Modelling of the ultraviolet and visual SED variability in the hot magnetic Ap star CU Virginis
Shulyak, D.; Krtička, J.; Lüftinger, T. +4 more
Context. The spectral energy distribution (SED) in chemically peculiar stars may be significantly affected by their abundance anomalies. The observed SED variations are usually assumed to be a result of inhomogeneous surface distribution of chemical elements, flux redistribution and stellar rotation. However, the direct evidence for this is still …
Luminous Satellites. II. Spatial Distribution, Luminosity Function, and Cosmic Evolution
Treu, T.; Auger, M. W.; Fassnacht, C. D. +3 more
We infer the normalization and the radial and angular distributions of the number density of satellites of massive galaxies (log10[M*h/M ⊙] > 10.5) between redshifts 0.1 and 0.8 as a function of host stellar mass, redshift, morphology, and satellite luminosity. Exploiting the depth and resolution of the COSMOS H…
Identification of HESS J1303-631 as a pulsar wind nebula through γ-ray, X-ray, and radio observations
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +195 more
Aims: The previously unidentified very high-energy (VHE; E > 100 GeV) γ-ray source HESS J1303-631, discovered in 2004, is re-examined including new data from the H.E.S.S. Cherenkov telescope array in order to identify this object. Archival data from the XMM-Newton X-ray satellite and from the PMN radio survey are also examined.
Method…
Climate-driven deposition of water ice and the formation of mounds in craters in Mars’ north polar region
Le Mouélic, Stéphane; Conway, Susan J.; Orosei, Roberto +4 more
This paper explores the origins and evolution of ice-rich interior mounds found within craters of the north polar region of Mars. We present a systematic study of impact craters above 65°N, and identify 18 craters that have interior mounds. At least 11 of these mounds are composed of water ice and geometric similarities suggest that dune-covered m…
The Relationship between the Sudden Change of the Lorentz Force and the Magnitude of Associated Flares
Liu, Chang; Wang, Haimin; Wang, Shuo
The rapid and irreversible change of photospheric magnetic fields associated with flares has been confirmed by many recent studies. These studies showed that the photospheric magnetic fields respond to coronal field restructuring and turn to a more horizontal state near the magnetic polarity inversion line (PIL) after eruptions. Recent theoretical…
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 …