Search Publications
Observed and simulated power spectra of kinetic and magnetic energy retrieved with 2D inversions
Danilovic, S.; van Noort, M.; Rempel, M. +1 more
Context. Information on the origin of internetwork magnetic field is hidden at the smallest spatial scales.
Aims: We try to retrieve the power spectra with certainty to the highest spatial frequencies allowed by current instrumentation.
Methods: To accomplish this, we use a 2D inversion code that is able to recover information up to the …
The ionization rates of galactic nuclei and disks from Herschel/HIFI observations of water and its associated ions
van der Tak, F. F. S.; Güsten, R.; Weiß, A. +1 more
Context. Dense gas in galactic nuclei is known to feed central starbursts and AGN, but the properties of this gas are poorly known because of the high obscuration by dust.
Aims: Submm-wave spectroscopy of water and its associated ions is useful to trace the oxygen chemistry of interstellar gas, in particular to constrain its ionization rate. …
Wind mass transfer in S-type symbiotic binaries. II. Indication of wind focusing
Skopal, A.; Shagatova, N.; Cariková, Z.
Context. The wind mass transfer from a giant to its white dwarf companion in symbiotic binaries is not well understood. For example, the efficiency of wind mass transfer of the canonical Bondi-Hoyle accretion mechanism is too low to power the typical luminosities of the accretors. However, recent observations and modelling indicate a considerably …
Richness-based masses of rich and famous galaxy clusters
Andreon, S.
We present a catalog of galaxy cluster masses derived by exploiting the tight correlation between mass and richness, I.e., a properly computed number of bright cluster galaxies. The richness definition adopted in this work is properly calibrated, shows a small scatter with mass, and has a known evolution, which means that we can estimate accurate …
Giant lobes of Centaurus A as seen in radio and γ-ray images obtained with the Fermi-LAT and Planck satellites
Aharonian, Felix; Yang, Rui-zhi; Sun, Xiao-na +1 more
The γ-ray data of Fermi-LAT on the giant lobes of Centaurus A are analysed together with the high frequency radio data obtained with the Planck satellite. The large γ-ray photon statistics, accumulated during seven years of observations, and the recently updated Fermi-LAT collaboration software tools allow substantial extension of the detected γ-r…
Distinguishing disks from mergers: Tracing the kinematic asymmetries in local (U)LIRGs using kinemetry-based criteria
Arribas, Santiago; Colina, Luis; Bellocchi, Enrica
Context. The kinematic characterization of different galaxy populations is a key observational input for distinguishing between different galaxy evolutionary scenarios because it helps to determine the number ratio of rotating disks to mergers at different cosmic epochs. Local (ultra) luminous infrared galaxies ((U)LIRGs) cover similar range of st…
Evidence for a chemical enrichment coupling of globular clusters and field stars in the Fornax dSph
Johnson, Christian I.; Mateo, Mario; Frank, Matthias J. +4 more
The globular cluster H4, located in the center of the Fornax dwarf spheroidal galaxy, is crucial for understanding the formation and chemical evolution of star clusters in low-mass galactic environments. H4 is peculiar because the cluster is significantly more metal-rich than the galaxy's other clusters, is located near the galaxy center, and may …
The long-wavelength thermal emission of the Pluto-Charon system from Herschel observations. Evidence for emissivity effects
Fornasier, S.; Lellouch, E.; Panuzzo, P. +9 more
Thermal observations of the Pluto-Charon system acquired by the Herschel Space Observatory in February 2012 are presented. They consist of photometric measurements with the PACS and SPIRE instruments (nine visits to the Pluto system each), covering six wavelengths from 70 to 500 µm altogether. The thermal light curve of Pluto-Charon is obser…
N131: A dust bubble born from the disruption of a gas filament
Zhang, Chuan-Peng; Li, Guang-Xing; Wyrowski, Friedrich +6 more
Context. OB-type stars have strong ionizing radiation and drive energetic winds. The ultraviolet radiation from ionizing stars may heat dust and ionize gas to sweep up an expanding bubble shell. This shell may be the result of feedback leading to a new generation of stars.
Aims: N131 is an infrared dust bubble residing in a molecular filament…
On the estimation of stellar parameters with uncertainty prediction from Generative Artificial Neural Networks: application to Gaia RVS simulated spectra
Allende Prieto, C.; Garabato, D.; Álvarez, M. A. +4 more
Aims: We present an innovative artificial neural network (ANN) architecture, called Generative ANN (GANN), that computes the forward model, that is it learns the function that relates the unknown outputs (stellar atmospheric parameters, in this case) to the given inputs (spectra). Such a model can be integrated in a Bayesian framework to esti…