Search Publications
Disk emission and atmospheric absorption lines in black hole candidate 4U 1630-472
Różańska, A.; Madej, J.; Bagińska, P. +2 more
Context. We analyzed Suzaku data of the black hole candidate 4U 1630-472 when it was in the high/soft state. The source, known for X-ray outbursts and for absorption dips, has an X-ray continuum spectrum that is interpreted correctly as emission from an accretion disk. Additionally, two absorption lines from He and H-like iron have been clearly de…
Phase-resolved X-ray spectroscopy and spectral energy distribution of the X-ray soft polar RS Caeli
Burwitz, V.; Walter, F. M.; Schwope, A. D. +3 more
Context. RS Cae is the third target in our series of XMM-Newton observations of soft X-ray-dominated polars.
Aims: Our observational campaign aims to better understand and describe the multiwavelength data, the physical properties of the system components, and the short- and long-term behavior of the component fluxes in RS Cae.
Methods: …
The young binary HD 102077: Orbit, spectral type, kinematics, and moving group membership
Henning, Thomas; Reffert, Sabine; Schlieder, Joshua E. +4 more
The K-type binary star HD 102077 was proposed as a candidate member of the TW Hydrae association (TWA) which is a young (5-15 Myr) moving group in close proximity (~50 pc) to the solar system. The aim of this work is to verify this hypothesis by different means. We first combine diffraction-limited observations from the ESO NTT 3.5 m telescope in …
XMM-Newton observations of the low-luminosity cataclysmic variable V405 Pegasi
Granzer, T.; Pires, A. M.; Thorstensen, J. R. +4 more
Context. V405 Peg is a low-luminosity cataclysmic variable (CV) that was identified as the optical counterpart of the bright, high-latitude ROSAT all-sky survey source RBS1955. The system was suspected to belong to a largely undiscovered population of hibernating CVs. Despite intensive optical follow-up its subclass however remained undetermined. …
Monte Carlo radiation transfer in CV disk winds: application to the AM CVn prototype
Werner, K.; Feldmeier, A.; Kusterer, D. -J. +2 more
Context. AM CVn systems are ultracompact binaries in which a (semi-) degenerate star transfers helium-dominated matter onto a white dwarf. They are effective gravitational-wave emitters and potential progenitors of Type Ia supernovae.
Aims: To understand the evolution of AM CVn systems it is necessary to determine their mass-loss rate through…
On the shape of the mass-function of dense clumps in the Hi-GAL fields . II. Using Bayesian inference to study the clump mass function
Testi, L.; Elia, D.; Pezzuto, S. +6 more
Context. Stars form in dense, dusty clumps of molecular clouds, but little is known about their origin, their evolution, and their detailed physical properties. In particular, the relationship between the mass distribution of these clumps (also known as the "clump mass function", or CMF) and the stellar initial mass function (IMF) is still poorly …
Rosette globulettes and shells in the infrared
Gahm, G. F.; Haikala, L. K.; Mäkelä, M. M.
Context. Giant galactic H ii regions surrounding central young clusters show compressed molecular shells, which have broken up into clumps, filaments, and elephant trunks interacting with UV light from central OB stars. Tiny, dense clumps of subsolar mass, called globulettes, form in this environment.
Aims: We observe and explore the nature a…
Scattered Lyman-α radiation of comet 2012/S1 (ISON) observed by SUMER/SOHO
Solanki, S. K.; Vincent, J. -B.; Curdt, W. +3 more
During its sungrazing perihelion passage, comet ISON appeared in the field of view of the SUMER spectrometer and allowed unique observations at far-ultraviolet wavelengths with high spatial and temporal resolution. We report results of these observations completed on November 28, 2013, when the comet was only 2.82 Rʘ away from the Sun. …
A whole sky study of quasars known population starting from the LQAC-2 compiled catalogue
Barache, C.; Souchay, J.; Gattano, C.
Context. Thanks to huge surveys, such as the Sloan Digital Sky Survey (SDSS), the last decade has shown a dramatic increase in the number of known quasars. In the second release of the general compiled catalogue Large Quasar Astrometric Catalogue (LQAC), 187 504 objects are recorded.
Aims: From this catalogue, we carry out statistical studies…
A mass threshold in the number density of passive galaxies at z ~ 2
Giavalisco, M.; McLure, R. J.; Dunlop, J. S. +17 more
The process that quenched star formation in galaxies at intermediate and high redshifts is still the subject of considerable debate. One way to investigate this puzzling issue is to study the number density of quiescent galaxies at z ≃ 2 and its dependence on mass. Here we present the results of a new study based on very deep Ks-band im…