Search Publications
Discovery of a redshifted X-ray emission line in the symbiotic neutron star binary 4U 1700+24
Sokoloski, J. L.; Tiengo, A.; Miller, J. M. +4 more
We present the spectral analysis of an XMM-Newton observation of the X-ray binary 4U 1700+24, performed during an outburst in August 2002. The EPIC-PN spectrum above 1 keV can be modeled by a blackbody plus Comptonization model, as in previous observations. At lower energies, however, we detect a prominent soft excess, which we model with a broad …
A uniqueness result for a simple force-free magnetic field submitted to a topological constraint
Aly, J. J.
A proof is given of the following statement: if B is a smooth force-free magnetic field contained in a cylindrical domain of axis parallel to z and of star-shaped cross-section, and if B is topologically equivalent to the uniform field B0=B0z, then B=B0. In addition to being a very first step in the general study o…
Electron densities in EUV coronal bright points
Doyle, J. G.; Del Zanna, G.; Ugarte-Urra, I.
Electron density measurements of six coronal bright points have been obtained using line ratio diagnostics of four ions in the temperature range 1.3-2.0 × 106 K. The results suggest that BP plasma has more similarities to active region plasma than to quiet Sun plasma. Nevertheless, they do not show the exact same behaviour: the increase…
XMM-Newton and VLT observations of the afterglow of GRB 040827
Covino, S.; D'Avanzo, P.; Caraveo, P. A. +13 more
The field of the Gamma-Ray Burst GRB 040827 was observed with XMM-Newton and with the ESO/VLT starting 6 and 12 h after the burst, respectively. A fading X-ray afterglow is clearly detected with the XMM-Newton/EPIC instrument, with a time decay t-δ, with δ=1.41±0.10. Its spectrum is well described by a power law (photon index Γ=2.3±0.1)…
Abundances in planetary nebulae: Mz 3
Pottasch, S. R.; Surendiranath, R.
ISO spectra of the bipolar planetary nebula
The near-UV pulse profile and spectrum of the pulsar PSR B0656+14
Sollerman, J.; Lundqvist, P.; Shibanov, Yu. A. +2 more
We have observed the middle-aged pulsar PSR B0656+14 with the prism and the NUV MAMA detector of the Space Telescope Imaging Spectrograph (STIS) to measure the pulsar spectrum and periodic pulsations in the near-ultraviolet (NUV). The pulsations are clearly detected, double-peaked and very similar to the optical pulse profile. The NUV pulsed fract…
Spectroscopy and stellar populations of star-forming galaxies at z ~ 3 in the Hubble Deep Field - South
Burgarella, D.; Inoue, A. K.; Iwata, I.
We present results of VLT/FORS2 spectroscopy of galaxies at z ∼ 3 in the Hubble Deep Field - South (HDF-S). A sample of galaxies was drawn from the photometric redshift catalogue based on the HST/WFPC2 optical images and the deep near-infrared images obtained with VLT/ISAAC as a part of the Faint Infrared Extragalactic Survey (FIRES) project. We s…
The X-ray emission from Young Stellar Objects in the ρ Ophiuchi cloud core as seen by XMM-Newton
Grosso, N.; Montmerle, T.; Ozawa, H.
The opacity of spiral galaxy disks. VII. The accuracy of galaxy counts as an extinction probe
Allen, Ronald J.; Holwerda, B. W.; van der Kruit, P. C. +1 more
The "Synthetic Field Method" (SFM) was introduced by González et al. (1998, ApJ, 506, 152) to calibrate numbers of distant galaxies as a probe of extinction in a foreground spiral disk. González et al. (2003, AJ, 125, 1182) studied the effect of the foreground disk on these numbers using simulations of current and future instruments for fields in …
Abundances in planetary nebulae: NGC 6886
Pottasch, S. R.; Surendiranath, R.
ISO and IUE spectra of the round-shaped planetary nebula