Search Publications
XMM-Newton EPIC observations of the ultraluminous X-ray source NGC 5204 X-1
Warwick, R. S.; Roberts, T. P.; Ward, M. J. +2 more
We present the results of two XMM-Newton observations of the ultraluminous X-ray source NGC 5204 X-1. The EPIC spectra are well fitted by the standard spectral model of a black hole X-ray binary, comprising a soft multicolour disc blackbody component plus a harder power-law continuum. The cool (kTin~ 0.2 keV) inner-disc temperature requ…
Discovery of a Fifth Image of the Large Separation Gravitationally Lensed Quasar SDSS J1004+4112
Castander, Francisco J.; Hennawi, Joseph F.; Hall, Patrick B. +11 more
We report on the discovery of a fifth lensed image in the large separation lensed quasar system SDSS J1004 + 4112. A faint point source located 0.''2 from the center of the brightest galaxy in the lensing cluster was detected in images taken with the Advanced Camera for Surveys (ACS) and the Near Infrared Camera and Multi-Object Spectrometer (NICM…
Unusual Pulsed X-Ray Emission from the Young, High Magnetic Field Pulsar PSR J1119-6127
Camilo, F.; Gaensler, B. M.; Gonzalez, M. E. +2 more
We present XMM-Newton observations of the radio pulsar PSR J1119-6127, which has an inferred age of 1700 yr and surface dipole magnetic field strength of 4.1×1013 G. We report the first detection of pulsed X-ray emission from PSR J1119-6127. In the 0.5-2.0 keV range, the pulse profile shows a narrow peak with a very high pulsed fraction…
Hubble Space Telescope Advanced Camera for Surveys Weak-Lensing and Chandra X-Ray Studies of the High-Redshift Cluster MS 1054-0321
Ford, H. C.; Jee, M. J.; Illingworth, G. D. +4 more
We present Hubble Space Telescope Advanced Camera for Surveys (ACS) weak-lensing and Chandra X-ray analyses of MS 1054-0321 at z=0.83, the most distant and X-ray-luminous cluster in the Einstein Extended Medium-Sensitivity Survey (EMSS). The high-resolution mass reconstruction through ACS weak lensing reveals the complicated dark matter substructu…
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-…