Search Publications
Fast horizontal flows in a quiet sun MHD simulation and their spectroscopic signatures
Fischer, C. E.; Keller, C. U.; Vögler, A. +1 more
Numerical simulations of solar surface convection have predicted the existence of supersonic horizontal flows in the photospheric granulation. Recently, the detection of such flows in data from the Hinode satellite was reported. We study supersonic granular flows in detail to understand their signatures in spectral lines and to test the observatio…
Hinode SOT/SP and SoHO/MDI quiet Sun magnetic field. Implications of their differences on the extrapolated chromospheric field and the height of the magnetic canopy
Tziotziou, K.; Tsiropoula, G.; Kontogiannis, I.
Aims: We explore the differences in the measurement of the magnetic field of the quiet solar photosphere provided by the Michelson Doppler Imager (MDI) onboard SoHO and the SpectroPolarimeter (SOT/SP) onboard Hinode and the ensuing implications for the extrapolated chromospheric magnetic field and the determination of the location of the magn…
A comprehensive approach to analyzing the XMM-Newton data of Seyfert 1 galaxies
Santos-Lleó, M.; Krongold, Y.; Rodríguez-Pascual, P. +3 more
Aims: We seek a comprehensive analysis of all the information provided by the XMM-Newton satellite of the four Seyfert 1 galaxies ESO 359-G19, HE 1143-1810, CTS A08.12, and Mrk 110, including the UV range, to characterize the different components that are emitting and absorbing radiation in the vicinity of the active nucleus.
Methods: Th…
Resolving the L/T transition binary SDSS J2052-1609 AB
Bouy, H.; Henning, Th.; Brandner, W. +3 more
Context. Binaries provide empirically derived key constraints for star formation theories, including the overall binary fraction, mass ratio distribution, and the separation distribution. They play crucial roles in calibrating the output of theoretical models, such as absolute magnitudes, colors, and effective temperature depending on mass, metall…
XMM-Newton observations of the young open cluster around λ Orionis
Franciosini, E.; Sacco, G. G.
Aims: We studied the X-ray properties of the young (~1-8 Myr) open cluster around the hot (O8 III) star λ Ori and compared them with those of the similarly-aged σ Ori cluster to investigate possible effects of the different ambient environment.
Methods: We analysed an XMM-Newton observation of the cluster using EPIC imaging and low-resol…
Identification of blue high proper motion objects in the Tycho-2 and 2MASS catalogues using Virtual Observatory tools
Caballero, J. A.; Solano, E.; Jiménez-Esteban, F. M.
Aims: With available Virtual Observatory tools, we looked for new bright blue high proper motion objects in the entire sky: white dwarfs, hot subdwarfs, runaway OB stars, and early-type stars in nearby young moving groups.
Methods: We performed an all-sky cross-match between the optical Tycho-2 and near-infrared 2MASS catalogues with Ala…
The bimodality of the 10k zCOSMOS-bright galaxies up to z ~ 1: a new statistical and portable classification based on optical galaxy properties
Kneib, J. -P.; Maccagni, D.; Cimatti, A. +56 more
Aims: Our goal is to develop a new and reliable statistical method to classify galaxies from large surveys. We probe the reliability of the method by comparing it with a three-dimensional classification cube, using the same set of spectral, photometric and morphological parameters.
Methods: We applied two different methods of classificat…
Discovery and identification of infrared counterpart candidates of four Galactic centre low mass X-ray binaries
Chaty, S.; Curran, P. A.; Zurita Heras, J. A.
Context. The near infrared (nIR)/optical counterparts of low mass X-ray binaries (LMXBs) are often observationally dim and reside in high source density fields which make their identification problematic; however, without such a counterpart identification we are unable to investigate many of the properties of LMXB systems.
Aims: Here, in the …
Oscillations in the wake of a flare blast wave
Innes, D. E.; Stenborg, G.; Tothova, D.
Context. Oscillations of coronal loops in the Sun have been reported in both imaging and spectral observations at the onset of flares. Images reveal transverse oscillations, whereas spectra detect line-of-sight velocity or Doppler-shift oscillations. The Doppler-shift oscillations are commonly interpreted as longitudinal modes.
Aims: Our aim …
INTEGRAL and Swift observations of IGR J19294+1816 in outburst
Walter, R.; Ferrigno, C.; Bozzo, E. +1 more
Context. IGR J19294+1816 was discovered by INTEGRAL in 2009 during a bright X-ray outburst and was classified as a possible Be X-ray binary or supergiant fast X-ray transient.
Aims: On 2010 October 28, the source displayed a second X-ray outburst and a two months-long monitoring with Swift was carried out to follow the evolution of the source…