Search Publications
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…
The radio-loud AGN population at z ≳ 1 in the COSMOS field. I. selection and spectral energy distributions
Chiaberge, Marco; Capetti, Alessandro; Baldi, Ranieri D. +1 more
We select a sample of radio galaxies at high redshifts (z ≳ 1) in the COSMOS field by cross-matching optical and infrared (IR) images with the FIRST radio data. The aim of this study is to explore the high-z radio-loud (RL) active galactic nuclei (AGN) population at much lower luminosities than the classical samples of distant radio sources, which…
Molecular tendrils feeding star formation in the Eye of the Medusa. The Medusa merger in high resolution 12CO 2-1 maps
Gallagher, J. S.; Petitpas, G.; Aalto, S. +5 more
Studying molecular gas properties in merging galaxies gives us important clues to the onset and evolution of interaction-triggered starbursts. NGC 4194 (the Medusa merger) is particularly interesting to study, since its FIR-to-CO luminosity ratio rivals that of ultraluminous galaxies (ULIRGs), despite its lower luminosity compared to ULIRGs, which…
The bivariate K-band-submillimetre luminosity functions of the local HRS galaxy sample
Andreani, P.; Ciesla, L.; De Looze, I. +6 more
We study the relationship between the K-band and the sub-millimetre (submm) emissions of nearby galaxies by computing the bivariate K-band-submm luminosity function (BLF) of the Herschel Reference Survey (HRS), a volume-limited sample observed in submm with Herschel/SPIRE. We derive the BLF from the K-band and submm cumulative distributions using …