Search Publications
Missions
Journals
Publication Years
Predictions of the arrival time of Coronal Mass Ejections at 1AU: an analysis of the causes of errors
Cargill, P.; Owens, M.
. Three existing models of Interplanetary Coronal Mass Ejection (ICME) transit between the Sun and the Earth are compared to coronagraph and in situ observations: all three models are found to perform with a similar level of accuracy (i.e. an average error between observed and predicted 1AU transit times of approximately 11h). To improve long-term…
Compact sources as the origin of the soft γ-ray emission of the Milky Way
Strong, A. W.; Walter, R.; Ubertini, P. +16 more
The Milky Way is known to be an abundant source of γ-ray photons, now determined to be mainly diffuse in nature and resulting from interstellar processes. In the soft γ-ray domain, point sources are expected to dominate, but the lack of sensitive high-resolution observations did not allow for a clear estimate of the contribution from such sources.…
A purely geometric distance to the binary star Atlas, a member of the Pleiades
Eyer, L.; North, P.; Groenewegen, M. A. T. +4 more
We present radial velocity and new interferometric measurements of the double star Atlas, which permit, with the addition of published interferometric data, to precisely derive the orbital parameters of the binary system and the masses of the components. The derived semi-major axis, compared with its measured angular size, allows to determine a di…
Wind clumping and the wind-wind collision zone in the Wolf-Rayet binary γ2 Velorum observations at high and low state. XMM-Newton observations at high and low state
Schmutz, W.; Raassen, A. J. J.; Mewe, R. +7 more
We present XMM-Newton observations of γ2 Velorum (WR 11, WC8+O7.5III, P = 78.53 d), a nearby Wolf-Rayet binary system, at its X-ray high and low states. At high state, emission from a hot collisional plasma dominates from about 1 to 8 keV. At low state, photons between 1 and 4 keV are absorbed. The hot plasma is identified with the shoc…
Time Dependence in Relativistic Collisionless Shocks: Theory of the Variable ``Wisps'' in the Crab Nebula
Spitkovsky, Anatoly; Arons, Jonathan
We describe results from time-dependent numerical modeling of the collisionless reverse shock terminating the pulsar wind in the Crab Nebula. We treat the upstream relativistic wind as composed of ions and electron-positron plasma embedded in a toroidal magnetic field, flowing radially outward from the pulsar in a sector around the rotational equa…
The Ultraviolet Extinction Curve of Intraclump Dust in Taurus (TMC-1): Constraints on the 2175 Å Bump Absorber
Gordon, Karl D.; Whittet, D. C. B.; Clayton, Geoffrey C. +1 more
Ultraviolet extinction curves for three early-type stars that sample dust in the Taurus dark cloud in the vicinity of TMC-1 are analyzed to examine the contribution of internal (intraclump) dust to the total line-of-sight extinction. One of our selected targets samples only dust in the ``diffuse-screen'' component of the cloud, where the dust grai…
An Optical Survey of Supernova Remnants in M83
Blair, William P.; Long, Knox S.
Observations of the face-on spiral galaxy M83 (NGC 5236) performed at the Cerro Tololo Inter-American Observatory in Chile have yielded a catalog of optical supernova remnant (SNR) candidates. These observations were performed with the 4 m Blanco telescope and a prime focus CCD imaging system using narrowband interference filters centered on the l…
Extragalactic Source Counts at 24 Microns in the Spitzer First Look Survey
Im, M.; Frayer, D. T.; Helou, G. +18 more
We present the Spitzer Multiband Imaging Photometer 24 µm source counts in the Extragalactic First Look Survey (FLS) main, verification, and European Large Area ISO Survey N1 fields. Spitzer's increased sensitivity and efficiency in large areal coverage over previous infrared telescopes, coupled with the enhanced sensitivity of the 24 µ…
Helioseismic Mapping of the Magnetic Canopy in the Solar Chromosphere
Finsterle, W.; McIntosh, S. W.; Jefferies, S. M. +2 more
We determine the three-dimensional topography of the magnetic canopy in and around active regions by mapping the propagation behavior of high-frequency acoustic waves in the solar chromosphere.
Eros and Faint Red Galaxies
McCarthy, Patrick J.
This chapter reviews the properties of faint IR-selected field galaxies and the extremely red color-selected populations in particular. These populations are a mix of passively evolving stellar systems and heavily obscured star-forming galaxies. The star-forming component appears to constitute 20 50% of the population depending on the magnitude an…