Search Publications
Missions
Journals
Publication Years
Hubble imaging excludes cosmic string lens
Hogan, Craig J.; Agol, Eric; Plotkin, Richard M.
The galaxy image pair Capodimonte-Sternberg-Lens Candidate no. 1 (CSL-1) has been a leading candidate for a cosmic string lens. High quality imaging data from the Hubble Space Telescope presented here show that it is not a lens but a pair of galaxies. The galaxies show different orientations of their principal axes, not consistent with any lens mo…
Evidence of a High Carbon Abundance in the Local Interstellar Cloud
Slavin, Jonathan D.; Frisch, Priscilla C.
The nature of the local interstellar cloud (LIC) is highly constrained by the combination of in situ heliospheric and line-of-sight data toward nearby stars. We present a new interpretation of the LIC components of the absorption-line data toward ɛ CMa, based on recent atomic data that include new rates for the Mg+ to Mg0 die…
The extreme Halloween 2003 solar flares (and Bastille Day, 2000 Flare), ICMEs, and resultant extreme ionospheric effects: A review
Tsurutani, B. T.; Judge, D. L.; Gonzalez, W. D. +5 more
Extreme solar flares can cause extreme ionospheric effects. The Oct 28, 2003 flare caused a ∼25 TECU (a total electron content unit is 10 16 electron/m 2 column density), or a ∼30%, increase in the local noon equatorial ionospheric column density. This enhancement occurred within ∼5 min. This TEC increase was ∼5 times the TEC…
The Nature of Weak Mg II Absorbing Structures
Charlton, Jane C.; Masiero, Joseph R.; Rigby, Jane R. +3 more
We consider geometries and physical models for weak low-ionization absorbers based on the relative incidence of low- and high-ionization systems. We present a survey of weak low-ionization systems in 35 high-resolution HST STIS quasar spectra, sometimes supplemented by Keck HIRES and HST FOS data. We found 16 metal-line systems, with low- and/or h…
Solar wind plasma protrusion into the martian magnetosphere: ASPERA-3 observations
Coates, A. J.; Kallio, E.; Fedorov, A. +37 more
The ASPERA-3 experiment onboard the Mars Express spacecraft revealed, near the wake boundary of Mars, a spatially narrow, strip-like plasma structure composed of magnetosheath-like electrons and planetary ions. The peak electron energy often exceeds the peak energy at the bow shock that indicates a significant heating (acceleration) during the str…
New Constraints on Additional Satellites of the Pluto System
Stern, S. A.; Weaver, H. A.; Mutchler, M. J. +8 more
Observations of Pluto and its solar-tidal stability zone were made using the Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) on the Hubble Space Telescope on UT 2005 May 15 and May 18. Two small satellites of Pluto, provisionally designated S/2005 P1 and S/2005 P2, were discovered, as discussed by Weaver et al. and Stern et al. Confirmi…
The X-ray properties of the dwarf Magellanic-type galaxy NGC 55
Warwick, R. S.; Roberts, T. P.; Stobbart, A. -M.
We present an analysis of the X-ray properties of the Magellanic-type galaxy NGC 55 based on two contiguous XMM-Newton observations. We detect a total of 137 X-ray sources in the field of view, down to a flux of ~5 × 10-15ergcm-2s-1 (0.3-6 keV), 42 of which are located within the optical confines of the galaxy. On …
THEMIS/MSDP magnetic field measurements
Schmieder, B.; Berlicki, A.; Mein, P.
We present an analysis of longitudinal magnetic field measurements using the spectral data obtained with the French - Italian polarisation free telescope THEMIS working in Multichannel Subtractive Double Pass (MSDP) mode. We also used SOHO/MDI data to extend our analysis. THEMIS observations in the MSDP mode allows us to perform imaging spectropol…
Plasma Diagnostics of the Large-Scale Corona with SUMER. I. Measurements at the West Limb
Landi, E.; Doschek, G. A.; Feldman, U.
In the present work we analyze the physical properties of the quiet-Sun plasma measured in a 0.5×1.8 Rsolar region above the west solar limb (Rsolar=solar radius). We make use of large scans obtained with the SUMER spectrometer on board SOHO to construct two-dimensional spatial maps of line intensities, electron temperature, …
Constraints on the nature of dust particles by infrared observations
Ábrahám, P.; Birkmann, S. M.; Laureijs, R. J. +2 more
The far-infrared (FIR) emissivity of dust is an important parameter characterizing the physical properties of the grains. With the availability of stellar data bases and FIR data from Infrared Space Observatory (ISO), it is possible to compare the optical and infrared properties of dust, and derive the FIR emissivity with respect to the optical ex…