Search Publications
XMM-Newton X-ray and HST weak gravitational lensing study of the extremely X-ray luminous galaxy cluster Cl J120958.9+495352 (z = 0.902)
Thölken, Sophia; Schrabback, Tim; Reiprich, Thomas H. +6 more
Context. Observations of relaxed, massive, and distant clusters can provide important tests of standard cosmological models, for example by using the gas mass fraction. To perform this test, the dynamical state of the cluster and its gas properties have to be investigated. X-ray analyses provide one of the best opportunities to access this informa…
Sharpening up Galactic all-sky maps with complementary data. A machine learning approach
Enßlin, Torsten; Bomans, Dominik J.; Dettmar, Ralf-Jürgen +4 more
Context. Galactic all-sky maps at very disparate frequencies, such as in the radio and γ-ray regime, show similar morphological structures. This mutual information reflects the imprint of the various physical components of the interstellar medium.
Aims: We want to use multifrequency all-sky observations to test resolution improvement and rest…
Collisionless Boltzmann equation approach for the study of stellar discs within barred galaxies
Bienaymé, Olivier
We have studied the kinematics of stellar disc populations within the solar neighbourhood in order to find the imprints of the Galactic bar. We carried out the analysis by developing a numerical resolution of the 2D2V (two-dimensional in the physical space, 2D, and two-dimensional in the velocity motion, 2V) collisionless Boltzmann equation and mo…
Analysis of unresolved photospheric magnetic field structure using Fe I 6301 and 6302 lines
Lozitsky, V. G.; Browning, P. K.; Gordovskyy, M. +1 more
Context.Early magnetographic observations indicated that the magnetic field in the solar photosphere has an unresolved small-scale structure. Near-infrared and optical data with extremely high spatial resolution show that these structures have scales of a few tens of kilometres, which are not resolved in the majority of solar observations. Aims.Th…
Is 4C+29.48 a γ-ray source?
An, T.; Gabányi, K. É.; Frey, S.
Context. The Fermi Large Area Telescope revealed that the extragalactic γ-ray sky is dominated by blazars, active galactic nuclei (AGN) whose jet is seen at very small angle to the line of sight. To associate and then classify the γ-ray sources, data have been collected from lower frequency surveys and observations. Since those have superior angul…
Synthetic photometry of globular clusters: Uncertainties on synthetic colors
Martins, F.
Context. Synthetic photometry is a great tool for studying globular clusters, especially for understanding the nature of their multiple populations.
Aims: Our goal is to quantify the errors on synthetic photometry that are caused by uncertainties on stellar and observational/calibration parameters. These errors can be taken into account when …
Improved model of the triple system V746 Cassiopeiae that has a bipolar magnetic field associated with the tertiary
Harmanec, P.; Zasche, P.; Korčáková, D. +9 more
V746 Cas is known to be a triple system composed of a close binary with an alternatively reported period of either 25.^d4 or 27.^d8 and a distant third component in a 170 yr (62 000 d) orbit. The object was also reported to exhibit multiperiodic light variations with periods from 0.^d83 to 2.^d50, on the basis of which it was classified as a slowl…
Discovery of an X-ray nebula in the field of millisecond pulsar PSR J1911-1114
Takata, J.; Hui, C. Y.; Lin, L. C. C. +1 more
We have discovered an extended X-ray feature, apparently associated with millisecond pulsar (MSP) PSR J1911-1114. The feature, which extends for ∼1', was discovered from an XMM-Newton observation; the radio timing position of PSR J1911-1114 is in the midpoint of the feature. The orientation of the feature is similar to the proper motion direction …
A unique distant submillimeter galaxy with an X-ray-obscured radio-luminous active galactic nucleus
Daddi, E.; Elbaz, D.; Wang, T. +10 more
Aims: We present a multiwavelength study of an atypical submillimeter galaxy, GH500.30, in the GOODS-North field, with the aim to understand its physical properties of stellar and dust emission, as well as the central active galactic nucleus (AGN) activity. Although it is shown that the source is likely an extremely dusty galaxy at high redsh…
EXTraS discovery of a peculiar flaring X-ray source in the Galactic globular cluster NGC 6540
Mereghetti, Sandro; Tiengo, Andrea; Belfiore, Andrea +7 more
We report the discovery of a flaring X-ray source 7″ from the center of the globular cluster NGC 6540 obtained during the EXTraS project devoted to a systematic search for variability in archival data of the XMM-Newton satellite. The source had a quiescent X-ray luminosity on the order of 1032 erg s-1 in the 0.5-10 keV range …