Search Publications
Galaxies under the Cosmic Microscope: A Gemini Multiobject Spectrograph Study of Lensed Disk Galaxy 289 in A2218
Smail, I.; Kneib, J. -P.; Smith, Graham P. +7 more
In this paper, we exploit the gravitational potential of the rich cluster A2218 as a magnifying glass. We demonstrate that the magnification due to the cluster allows us to observe distant background galaxies at a comparable level of detail to galaxies at z~0.1. Using the Gemini Multiobject Spectrograph (GMOS) integral field unit (IFU) on Gemini N…
Ultraviolet Spectroscopy of Narrow Coronal Mass Ejections
Raymond, J. C.; Dobrzycka, D.; Biesecker, D. A. +2 more
We present Ultraviolet Coronagraph Spectrometer (UVCS) observations of five narrow coronal mass ejections (CMEs) that were among 15 narrow CMEs originally selected by Gilbert and coworkers. Two events (1999 March 27, April 15) were ``structured,'' i.e., in white-light data they exhibited well-defined interior features, and three (1999 May 9, May 2…
The 2001 April Burst Activation of SGR 1900+14: X-Ray Afterglow Emission
Hurley, K.; Costa, E.; Mereghetti, S. +8 more
After nearly two years of quiescence, the soft gamma-ray repeater SGR 1900+14 again became burst-active on 2001 April 18, when it emitted a large flare, preceded by few weak and soft short bursts. After having detected the X- and gamma-prompt emission of the flare, BeppoSAX pointed its narrow field X-ray telescopes to the source in less than 8 hr.…
Mid-IR emission of galaxies in the Virgo cluster III. The data
Sauvage, M.; Boselli, A.; Gavazzi, G. +2 more
We present ISOCAM imaging data at 6.75 and 15 mu m for 145 galaxies in the Virgo cluster and in the Coma/A1367 supercluster. Of these, 99 form a complete, optically-selected, volume-limited sample including galaxies in the core and in the periphery of the Virgo cluster, suitable for statistical analysis. 34 of the Virgo galaxies were resolved by I…
A Scattered Light Echo around SN 1993J in M81
Bregman, Joel N.; Seitzer, Patrick; Liu, Ji-Feng
A light echo around SN 1993J was observed 8.2 yr after explosion by a Hubble Space Telescope Wide Field Planetary Camera 2 observation, adding to the small family of supernovae with light echoes. The light echo was formed by supernova light scattered from a dust sheet that lies 220 pc away from the supernova, 50 pc thick along the line of sight, a…
The Line Emission Region in III Zw 2: Kinematics and Variability
Bon, E.; Popović, L. Č.; Mediavilla, E. G. +2 more
We have studied the Lyα, Hβ, Hα, and Mg II λ2798 line profiles of the Seyfert 1 galaxy III Zw 2. The shapes of these broad emission lines show evidence of a multicomponent origin and also features that may be identified as the peaks due to a rotating disk. We have proposed a two-component broad-line region (BLR) model consisting of an inner Kepler…
X-ray spectroscopy of the cluster of galaxies PKS 0745-191 with XMM-Newton
Böhringer, H.; Chen, Y.; Ikebe, Y.
We present the results from XMM-Newton observations of the cluster of galaxies
Searching for unknown open clusters in the Tycho-2 catalog
Moitinho, A.; Dias, W. S.; Alessi, B. S.
We present 11 new open cluster candidates found in a systematic search for unknown star clusters using the astrometric and photometric data included in the Tycho 2 catalog. The possible existence of these stellar aggregates is supported by the analysis of proper motions, color-magnitude diagrams, stellar density distributions, and by the visual in…
X-Ray Emission from the Pre-planetary Nebula Henize 3-1475
Frank, Adam; Kastner, Joel H.; Sahai, Raghvendra +2 more
We report the first detection of X-ray emission in a pre-planetary nebula, He 3-1475. Pre-planetary nebulae are rare objects in the short transition stage between the asymptotic giant branch (AGB) and planetary nebula evolutionary phases, and He 3-1475, characterized by a remarkable S-shaped chain of optical knots, is one of the most noteworthy me…
The X-ray eclipse of OY Car resolved with XMM-Newton: X-ray emission from the polar regions of the white dwarf
Wheatley, Peter J.; West, Richard G.
We present the XMM-Newton X-ray eclipse light curve of the dwarf nova OY Car. The eclipse ingress and egress are well resolved for the first time in any dwarf nova placing strong constraints on the size and the location of the X-ray emitting region. We find good fits to a simple linear eclipse model, giving ingress/egress durations of 30 +/- 3 s (…