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How good is the relationship of solar and interplanetary plasma parameters with geomagnetic storms?
Kane, R. P.
Since the work of Snyder et al. (1963), who showed a possible link between interplanetary solar wind speed V and geomagnetic index Kp, such a relationship has been examined by many workers and found to be rather loose. In the present communication this relationship is rechecked for all data during 1973-2003. It was noted that moderate or strong ge…
The Herbig Ae Star HD 163296 in X-Rays
Drake, Jeremy J.; Swartz, Douglas A.; Ghosh, Kajal K. +5 more
Chandra X-ray imaging spectroscopy of the nearby Herbig Ae star HD 163296 at 100 AU angular resolution is reported. A pointlike, soft (kT~0.5 keV), emission-line source is detected at the location of the star with an X-ray luminosity of 4×1029 ergs s-1 (logLX/Lbol=-5.48). In addition, faint emission alon…
Composition of Saturnian Stream Particles
Postberg, Frank; Grün, Eberhard; Kempf, Sascha +9 more
During Cassini's approach to Saturn, the Cosmic Dust Analyser (CDA) discovered streams of tiny (less than 20 nanometers) high-velocity (~100 kilometers per second) dust particles escaping from the saturnian system. A fraction of these impactors originated from the outskirts of Saturn's dense A ring. The CDA time-of-flight mass spectrometer recorde…
Multiplicity at the Stellar/Substellar Boundary in Upper Scorpius
Kraus, Adam L.; Hillenbrand, Lynne A.; White, Russel J.
We present the results of a high-resolution imaging survey of 12 brown dwarfs and very low mass stars in the closest (~145 pc) young (~5 Myr) OB association, Upper Scorpius. We obtained images with the Advanced Camera for Surveys High Resolution Channel on HST through the F555W (V), F775W (i'), and F850LP (z') filters. This survey discovered three…
Discovery of Multiply Imaged Galaxies behind the Cluster and Lensed Quasar SDSS J1004+4112
Smith, Graham P.; Broadhurst, Tom; Maoz, Dan +7 more
We have identified three multiply imaged galaxies in Hubble Space Telescope images of the redshift z=0.68 cluster responsible for the large-separation quadruply lensed quasar, SDSS J1004+4112. Spectroscopic redshifts have been secured for two of these systems using the Keck I 10 m telescope. The most distant lensed galaxy, at z=3.332, forms at lea…
Absorption and scattering by interstellar dust: an XMM-Newton observation of Cyg X-2
Costantini, E.; Freyberg, M. J.; Predehl, P.
We present results of the XMM-Newton observation of the bright X-ray binary Cyg X-2. In our analysis we focus on the absorption and scattering of the X-ray emission by interstellar dust distributed along the line of sight. The scattering halo around Cyg X-2, observed with the CCD detector EPIC-pn, is well detected up to 7 arcmin and contributes 5-…
Thermal X-Ray Emission from Shocked Ejecta in Type Ia Supernova Remnants. II. Parameters Affecting the Spectrum
Badenes, Carles; Borkowski, Kazimierz J.; Bravo, Eduardo
The supernova remnants (SNRs) left behind by Type Ia supernovae (SNe) provide an excellent opportunity for the study of these enigmatic objects. In a previous work we showed that it is possible to use the X-ray spectra of young Type Ia SNRs to explore the physics of Type Ia SNe and identify the relevant mechanism underlying these explosions. Our s…
Thermal Dust Emission from Proplyds, Unresolved Disks, and Shocks in the Orion Nebula
Smith, Nathan; Bally, John; Kassis, Marc +2 more
We present a new 11.7 µm mosaic image of the inner Orion Nebula obtained with the T-ReCS instrument on Gemini South. The map covers 2.7 arcmin 7×1.6 arcmin, with a diffraction-limited spatial resolution of 0.35" it includes the BN/KL region, the Trapezium, and OMC-1 South. Excluding BN/KL, we detect 91 thermal-IR point sources, with 27 known…
Nine Years Of Euv Bright Points
McIntosh, Scott W.; Gurman, Joseph B.
We discuss early results derived from an algorithm that automates the detection, cataloging, and analysis of extreme-ultraviolet (EUV) "bright points" (BP) from 9 years of data acquired by the Extreme-ultraviolet Imaging Telescope (EIT) on the Solar and Heliospheric Observatory (SOHO). The algorithm relies upon the computation of a map of "intensi…
The Fading of Transient Anomalous X-Ray Pulsar XTE J1810-197
Gotthelf, E. V.; Halpern, J. P.
Three observations of the 5.54 s transient anomalous X-ray pulsar XTE J1810-197 obtained over 6 months with the Newton X-ray Multi-Mirror (XMM-Newton) mission are used to study its spectrum and pulsed light curve as the source fades from outburst. The decay is consistent with an exponential of time constant ~300 days but not a power law as predict…