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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…
Constraining the absolute orientation of η Carinae's binary orbit: a 3D dynamical model for the broad [Fe III] emission
Gull, T. R.; Madura, T. I.; Owocki, S. P. +3 more
We present a three-dimensional (3D) dynamical model for the broad [Fe III] emission observed in η Carinae using the Hubble Space Telescope/Space Telescope Imaging Spectrograph (STIS). This model is based on full 3D smoothed particle hydrodynamics simulations of η Car's binary colliding winds. Radiative transfer codes are used to generate synthetic…
A Statistical Study of Solar Electron Events over One Solar Cycle
Krucker, Säm; Lin, R. P.; Mason, Glenn M. +1 more
We survey the statistical properties of 1191 solar electron events observed by the WIND 3DP instrument from <1 keV to gsim300 keV for a solar cycle (1995 through 2005). After taking into account times of high background, the corrected occurrence frequency of solar electron events versus peak flux exhibits a power-law distribution over three ord…
Reconstructing the Near-infrared Background Fluctuations from Known Galaxy Populations Using Multiband Measurements of Luminosity Functions
Ricotti, Massimo; Kashlinsky, Alexander; Helgason, Kari
We model fluctuations in the cosmic infrared background (CIB) arising from known galaxy populations using 233 measured UV, optical, and near-IR luminosity functions (LFs) from a variety of surveys spanning a wide range of redshifts. We compare best-fit Schechter parameters across the literature and find clear indication of evolution with redshift.…
The Herschel Virgo Cluster Survey. X. The relationship between cold dust and molecular gas content in Virgo spirals
Bianchi, S.; Fritz, J.; Madden, S. C. +16 more
Aims: We examine whether dust mass can trace the total or molecular gas mass in late-type Virgo cluster galaxies, and how the environment affects the dust-to-gas ratio and the molecular fraction.
Methods: Using the far-infrared emission, as observed by the Herschel Virgo Cluster Survey (HeViCS), and the integrated HI 21-cm and CO J = 1-0…
Sunyaev-Zel'dovich clusters in Millennium gas simulations
Thomas, Peter A.; Kay, Scott T.; Liddle, Andrew R. +5 more
Large surveys using the Sunyaev-Zel'dovich (SZ) effect to find clusters of galaxies are now starting to yield large numbers of systems out to high redshift, many of which are new discoveries. In order to provide theoretical interpretation for the release of the full SZ cluster samples over the next few years, we have exploited the large-volume Mil…