Search Publications
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…
The jet of the BL Lacertae object PKS 0521-365 in the near-IR: MAD adaptive optics observations
Pian, E.; Moretti, A.; Falomo, R. +14 more
Context: BL Lac objects are low-power active nuclei exhibiting a variety of peculiar properties caused by the presence of a relativistic jet and orientation effects.
Aims: We present adaptive optics near-IR images at high spatial resolution of the nearby BL Lac object PKS 0521-365, which is known to display a prominent jet both at radio and op…
Young pre-low-mass X-ray binaries in the propeller phase. Nature of the 6.7-h periodic X-ray source 1E 161348-5055 in RCW 103
Bhadkamkar, H.; Ghosh, P.
Context: Discovery of the 6.7-h periodicity in the X-ray source 1E 161348-5055 in RCW 103 has led to investigations of the nature of this periodicity.
Aims: To explore a model for 1E 161348-5055 wherein a fast-spinning neutron star with a magnetic field ~1012 G in a young pre-low-mass X-ray Binary (pre-LMXB) with an eccentric orbit …
Response of the solar atmosphere to magnetic field evolution in a coronal hole region
Zhang, J.; Li, L. P.; Yang, S. H. +2 more
Context: Coronal holes (CHs) are deemed to be the sources of the fast solar wind streams that lead to recurrent geomagnetic storms and have been intensively investigated, but not all the properties of them are well known.
Aims: We study the response of the solar atmosphere to the magnetic field evolution in a CH region, such as magnetic flux e…
The X-ray eclipse of the dwarf nova HT Cassiopeiae observed by the XMM-Newton satellite: spectral and timing analysis
Guainazzi, M.; Nucita, A. A.; Carpano, S. +5 more
Context: A cataclysmic variable is a binary system consisting of a white dwarf that accretes material from a secondary object via the Roche-lobe mechanism. In the case of long enough observation, a detailed temporal analysis can be performed, allowing the physical properties of the binary system to be determined.
Aims: We present an XMM-Newton…
The changing look of PKS 2149-306
Tagliaferri, G.; Ghisellini, G.; Pian, E. +8 more
Aims: We study the blazar nature of the high-redshift Flat-Spectrum Radio Quasar PKS 2149-306 (z = 2.345) by investigating its long-term behavior.
Methods: We analyzed all publicly available optical-to-X-ray observations performed by XMM-Newton, Swift, and INTEGRAL.
Results: PKS 2149-306 is one of four blazars at z > 2 that have been ob…
A planetary eclipse map of CoRoT-2a. Comprehensive lightcurve modeling combining rotational-modulation and transits
Schmitt, J. H. M. M.; Czesla, S.; Wolter, U. +1 more
We analyze the surface structure of the planet host star CoRoT-2a using a consistent model for both the “global” (i.e., rotationally modulated) lightcurve and the transit lightcurves, using data provided by the CoRoT mission. After selecting a time interval covering two stellar rotations and six transits of the planetary companion CoRoT-2b, we hav…