Search Publications
Physical properties of amorphous solid interstellar material from X-ray absorption spectroscopy of Scorpius X-1
Costantini, E.; de Vries, C. P.
High-quality, high-resolution X-ray spectra were obtained of
COSMOS 5921+0638: characterization and analysis of a new strong gravitationally lensed AGN
Kneib, J. -P.; Koekemoer, A. M.; Faure, C. +4 more
Context: Strong lens candidates have been newly identified within the COSMOS field. We present VLT/FORS1 spectroscopic follow-up observations and HST/WFPC2 imaging of the system COSMOS 5921+0638, which exhibits quadruply lensed images and a perfect Einstein ring.
Aims: We investigate the nature of COSMOS 5921+0638 by studying its photometric, …
Suzaku observation of IGR J16318-4848
Nowak, M. A.; Tomsick, J. A.; Walter, R. +4 more
We report on the first <sl>Suzaku</sl> observation of IGR J16318-4848, the most extreme example of a new group of highly absorbed X-ray binaries that have recently been discovered by the International Gamma-Ray Astrophysics Laboratory (<sl>INTEGRAL</sl>). The <sl>Suzaku</sl> observation was carried out between 2…
The correlation of fractal structures in the photospheric and the coronal magnetic field
Moussas, X.; Anastasiadis, A.; Georgoulis, M. +4 more
Context: This work examines the relation between the fractal properties of the photospheric magnetic patterns and those of the coronal magnetic fields in solar active regions.
Aims: We investigate whether there is any correlation between the fractal dimensions of the photospheric structures and the magnetic discontinuities formed in the corona…
The nature of the X-ray binary IGR J19294+1816 from INTEGRAL, RXTE, and Swift observations
Chaty, S.; Tomsick, J. A.; Rodriguez, J. +4 more
We report the results of a high-energy multi-instrumental campaign with INTEGRAL, RXTE, and Swift of the recently discovered INTEGRAL source IGR J19294+1816. The Swift/XRT data allow us to refine the position of the source to {RA}J2000 = 19h 29m 55.9s {Dec}J2000 = +18° 18 arcmin38.4 arcsec (±3…
Distribution of jets and magnetic fields in a coronal hole
Curdt, W.; Hara, H.; Watanabe, T. +1 more
Context: Recent observations of ubiquitous jets in coronal holes suggest that they play an important role in coronal heating and solar wind acceleration.
Aims: The aim of our study is to understand the magnetic connectivity and the formation of jets in coronal holes. The study of jets also helps to understand the magnetic field configuration i…
3C 33: another case of photoionized soft X-ray emission in radio galaxies
Bianchi, S.; Ponti, G.; Guainazzi, M. +3 more
We investigate the X-ray spectral properties of 3C 33 by analyzing all the observations available in the Chandra and XMM-Newton archives. In this paper we present a complete X-ray analysis of the nuclear emission of this narrow-line radio galaxy. The broad-band spectrum of 3C 33 is complex. Its hard part resembles that of Seyfert 2 galaxies, which…
A search for thermally emitting isolated neutron stars in the 2XMMp catalogue
Motch, C.; Pires, A. M.; Janot-Pacheco, E.
The relatively large number of nearby radio-quiet and thermally emitting isolated neutron stars (INSs) discovered in the ROSAT All-Sky Survey, dubbed the “Magnificent Seven”, suggests that they belong to a formerly neglected major component of the overall INS population. So far, attempts to discover similar INSs beyond the solar vicinity failed to…
Metallicity map of the galaxy cluster A3667
Lovisari, L.; Schindler, S.; Ferrari, C. +1 more
We use XMM-Newtondata of the merging cluster Abell 3667 to analyze its metallicity distribution. A detailed abundance map of the central 1.1 × 1.1 Mpc region indicates that metals are inhomogeneously distributed in the cluster showing a non-uniform and very complex metal pattern. The highest peak in the map corresponds to a cold region, slightly o…
Perturbative reconstruction of a gravitational lens: when mass does not follow light
Alard, C.
Aims: The structure and potential of a complex gravitational lens is reconstructed using the perturbative method presented in Alard (2007, MNRAS, 382, L58; 2008, MNRAS, 388, 375). This lens is composed of 6 galaxies belonging to a small group.
Methods: The lens inversion is reduced to the problem of reconstructing non-degenerate quantities: th…