Search Publications
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…
The isolated neutron star RBS1774 revisited. Revised XMM-Newton X-ray parameters and an optical counterpart from deep LBT-observations
Steinmetz, M.; Fontana, A.; Giallongo, E. +12 more
We report optical B-band observations with the Large Binocular Telescope (LBT) of the isolated neutron star RBS1774. The stacked image with a total exposure of 2fh5 reveals a candidate optical counterpart at mB = 26.96 ± 0.20 at position α (2000) = 21^h43^m03fs40, δ(2000) = +06degr54^prime17farcs5, within the joint Chandra and XMM-Newto…
An X-ray spectral survey of the disc of M 31 with XMM-Newton
Kolb, U.; Osborne, J. P.; Barnard, R. +2 more
Aims: We present the results of a complete spectral survey of the X-ray point sources detected in five XMM-Newton observations along the major axis of M 31 but avoiding the central bulge, aimed at establishing the population characteristics of X-ray sources in this galaxy.
Methods: We obtained background subtracted spectra and lightcurves for …
On the inverse Compton scattering interpretation of the hard X-ray excesses in galaxy clusters: the case of Ophiuchus
Colafrancesco, S.; Marchegiani, P.
Context: Populations of high energy electrons can produce hard X-ray (HXR) emission in galaxy clusters by up-scattering CMB photons via the inverse Compton scattering (ICS) mechanism. However, this scenario has various astrophysical consequences.
Aims: We discuss here the consequences of the presence of a population of high energy particles fo…
Determination of the cosmic far-infrared background level with the ISOPHOT instrument
Juvela, M.; Lemke, D.; Klaas, U. +3 more
Context: The cosmic infrared background (CIRB) consists mainly of the integrated light of distant galaxies. In the far-infrared the current estimates of its surface brightness are based on the measurements of the COBE satellite. Independent confirmation of these results is still needed from other instruments.
Aims: In this paper we derive esti…