Search Publications
The XMM deep survey in the CDFS. XI. X-ray spectral properties of 185 bright sources
Brandt, W. N.; Vignali, C.; Gilli, R. +11 more
We present the X-ray spectra of 185 bright sources detected in the XMM-Newton deep survey of the Chandra Deep Field South with the three EPIC cameras combined. The 2-10 keV flux limit of the sample is 2 × 10-15 erg s-1 cm-2. The sources are distributed over a redshift range of z = 0.1-3.8, with 11 new X-ray redshif…
Precise calibration of the dependence of surface brightness-colour relations on colour and class for late-type stars
White, T. R.; Huber, D.; Farrington, C. D. +9 more
Context. Surface brightness-colour relations (SBCRs) are used to derive the stellar angular diameters from photometric observations. They have various astrophysical applications, such as the distance determination of eclipsing binaries or the determination of exoplanet parameters. However, strong discrepancies between the SBCRs still exist in the …
Optical interferometry and Gaia measurement uncertainties reveal the physics of asymptotic giant branch stars
Schultheis, M.; Millour, F.; Chiavassa, A. +20 more
Context. Asymptotic giant branch (AGB) stars are cool luminous evolved stars that are well observable across the Galaxy and populating Gaia data. They have complex stellar surface dynamics, which amplifies the uncertainties on stellar parameters and distances.
Aims: On the AGB star CL Lac, it has been shown that the convection-related variabi…
Molecular gas and star formation activity in luminous infrared galaxies in clusters at intermediate redshifts
Arnaud, M.; Jablonka, P.; Krips, M. +10 more
We investigate the role of dense megaparsec-scale environments in processing molecular gas of cluster galaxies as they fall into the cluster cores. We selected a sample of ∼20 luminous infrared galaxies (LIRGs) belonging to intermediate-redshift clusters, mainly from the Herschel Lensing Survey and the Local Cluster Substructure Survey. These gala…
Cosmology with the submillimetre galaxies magnification bias: Proof of concept
Bonavera, L.; González-Nuevo, J.; Migliaccio, M. +6 more
Context. As recently demonstrated, high-z submillimetre galaxies (SMGs) are the perfect background sample for tracing the mass density profiles of galaxies and clusters (baryonic and dark matter) and their time-evolution through gravitational lensing. Their magnification bias, a weak gravitational lensing effect, is a powerful tool for constrainin…
Gravitational Lensing and Dynamics (GLaD): combined analysis to unveil properties of high-redshift galaxies
Halkola, A.; Suyu, S. H.; Yıldırım, A. +1 more
The dynamical modelling of integral field unit (IFU) stellar kinematics is a powerful tool to unveil the dynamical structure and mass build-up of galaxies in the local Universe, while gravitational lensing is nature's cosmic telescope to explore the properties of galaxies beyond the local Universe. We present a new approach, which unifies dynamica…
XMM-Newton observations of eleven intermediate polars and possible candidates
Mukai, K.; Schwope, A. D.; Traulsen, I. +2 more
Aims: We aim to identify new intermediate polars (IPs) in XMM-Newton observations from a list of promising candidates. By selecting targets not previously known to be X-ray bright, we aim to uncover evidence for an X-ray underluminous IP subpopulation.
Methods: We performed period searches on the XMM-Newton X-ray and optical data of our …
Connecting measurements of solar and stellar brightness variations
Solanki, S. K.; Shapiro, A. I.; Krivova, N. A. +3 more
Context. A comparison of solar and stellar brightness variations is hampered by the difference in spectral passbands that are used in observations, and also by the possible difference in the inclination of the solar and stellar rotation axes from the line of sight.
Aims: We calculate the rotational variability of the Sun as it would be measur…
Non-stoichiometric amorphous magnesium-iron silicates in circumstellar dust shells. Dust growth in outflows from supergiants
Tamanai, Akemi; Pucci, Annemarie; Dohmen, Ralf +1 more
Aims: We study the growth of dust in oxygen-rich stellar outflows in order to find out to which extent dust growth models can quantitatively reconcile with the quantities and nature of dust as derived from observations of the infrared emission from circumstellar dust shells.
Methods: We use a set of nine well-observed massive supergiants…
Low-cost precursor of an interstellar mission
Heller, René; Hippke, Michael; Kervella, Pierre +1 more
The solar photon pressure provides a viable source of thrust for spacecraft in the solar system. Theoretically it could also enable interstellar missions, but an extremely small mass per cross section area is required to overcome the solar gravity. We identify aerographite, a synthetic carbon-based foam with a density of 0.18 kg m-3 (15…