Search Publications
Missions
Journals
Publication Years
XMM-Newton study of the lensing cluster of galaxies CL 0024+17
Zhang, Y. -Y.; Böhringer, H.; Forman, W. +2 more
We present a detailed gravitational mass measurement based on the XMM-Newton imaging spectroscopy analysis of the lensing cluster of galaxies CL 0024+17 at z=0.395. The emission appears approximately symmetric. However, on the scale of r ∼ 3.3' some indication of elongation is visible in the northwest-southeast (NW-SE) direction from th…
The Tully-Fisher relation of distant cluster galaxies
Milvang-Jensen, B.; Aragón-Salamanca, A.; Bamford, S. P. +1 more
We have measured maximum rotation velocities (Vrot) for a sample of 111 emission-line galaxies with 0.1 <~z<~ 1, observed in the fields of six clusters. From these data we construct `matched' samples of 58 field and 22 cluster galaxies, covering similar ranges in redshift (0.25 <=z<= 1.0) and luminosity (MB<=-1…
Optical and infrared signatures of ultra-luminous X-ray sources
Copperwheat, Christopher; Cropper, Mark; Soria, Roberto +1 more
We have constructed a model to describe the optical emission from ultra-luminous X-ray sources (ULXs). We assume a binary model with a black hole accreting matter from a Roche lobe filling companion star. We consider the effects of radiative transport and radiative equilibrium in the irradiated surfaces of both the star and a thin accretion disc. …
The dark lane of the planetary nebula NGC 6302*†
Waters, L. B. F. M.; Sahai, R.; Zijlstra, A. A. +4 more
The butterfly-shaped planetary nebula, NGC 6302, shows a unique, dense equatorial dark lane, which is presumably a dusty disc, obscuring an unobserved, very hot central star. We trace the structure of this disc using Hubble Space Telescope Hα and [N II] images, Very Large Telescope L-and M-band images at 0.4-arcsec resolution, including Brα and po…
A quantum electrodynamics model for non-thermal emission from soft gamma repeaters and anomalous X-ray pulsars
Hernquist, Lars; Heyl, Jeremy S.
Previously, we showed that, owing to effects arising from quantum electrodynamics (QED), magnetohydrodynamic fast modes of sufficient strength will break down to form electron-positron pairs while traversing the magnetospheres of strongly magnetized neutron stars. The bulk of the energy of the fast mode fuels the development of an electron-positro…
The Connection between the Narrow-Line Region and the UV Absorbers in Seyfert Galaxies
Kraemer, S. B.; Crenshaw, D. M.
We present evidence that the outflowing UV absorbers in Seyfert 1 galaxies arise primarily in their inner narrow- (emission-) line regions (NLRs), based on similarities in their locations, kinematics, and physical conditions. Hubble Space Telescope observations show that nearly all Seyfert galaxies have bright, central knots of [O III] emission in…
Spectral properties of nonthermal X-ray emission from the shell-type SNR RX J1713.7 3946 as revealed by XMM-Newton
Hiraga, J. S.; Takahashi, T.; Uchiyama, Y. +1 more
We present the results of our morphological and spectral study of the properties of the supernova remnant RX J1713.7-3946 based on data obtained with XMM-Newton. Highly inhomogeneous structures, such as the bright spots, filaments, and dark voids noted by Uchiyama et al. ([CITE]), appear in the entire bright western portion of the shell. In additi…
Characteristics of the near-tail dawn magnetopause and boundary layer
Klecker, B.; Vaivads, A.; Hasegawa, H. +6 more
The paper discusses properties of the near-tail dawnside and boundary layer, as obtained from Cluster plasma and magnetic field measurements during a single skimming orbit on 4 and 5 July 2001 that included 24 well-defined crossings by all four spacecraft. As a result of variations of the interplanetary magnetic field, the magnetic shear across th…
The pulsed X-ray light curves of the isolated neutron star RBS1223
Haberl, F.; Motch, C.; Schwope, A. D. +1 more
We present a multi-epoch spectral and timing analysis of the isolated neutron star RBS1223. New XMM-Newton data obtained in January 2004 confirm the spin period to be twice as long as previously thought, P_spin = 10.31 s. The combined ROSAT, Chandra, and XMM-Newton data (6 epochs) give, contrary to earlier findings, no clear indication of a spin e…
Spatially Resolved Spectroscopy and Coronagraphic Imaging of the TW Hydrae Circumstellar Disk
Weinberger, Alycia J.; Roberge, Aki; Malumuth, Eliot M.
We present the first spatially resolved spectrum of scattered light from the TW Hydrae protoplanetary disk. This nearly face-on disk is optically thick, surrounding a classical T Tauri star in the nearby 10 Myr old TW Hya association. The spectrum was taken with the Hubble Space Telescope (HST) STIS CCD, providing resolution R~360 over the wavelen…