Search Publications
Herschel-HIFI view of mid-IR quiet massive protostellar objects
Braine, J.; Bontemps, S.; van Dishoeck, E. F. +9 more
Aims: We present Herschel/HIFI observations of 14 water lines in a small sample of Galactic massive protostellar objects: NGC 6334I(N), DR21(OH), IRAS 16272-4837, and IRAS 05358+3543. Using water as a tracer of the structure and kinematics, we individually study each of these objects with the aim to estimate the amount of water around them, b…
A large active wave trapped in Jupiter's equator
Sánchez-Lavega, A.; García-Melendo, E.; Gómez-Forrellad, J. M. +2 more
Context. A peculiar atmospheric feature was observed in the equatorial zone (EZ) of Jupiter between September and December 2012 in ground-based and Hubble Space Telescope (HST) images. This feature consisted of two low albedo Y-shaped cloud structures (Y1 and Y2) oriented along the equator and centred on it (latitude 0.5°-1°N).
Aims: We wante…
The HST view of the innermost narrow line region
Marconi, Alessandro; Capetti, Alessandro; Baldi, Ranieri D. +2 more
We analyze the properties of the innermost narrow line region in a sample of low-luminosity AGN. We select 33 LINERs (bona fide AGN) and Seyfert galaxies from the optical spectroscopic Palomar survey observed by HST/STIS. We find that in LINERs the [ N II ] and [ O I ] lines are broader than the [ S II ] line and that the [ N II ] /[ S II ] flux r…
The H I supershell GS 118+01-44 and its role in the interstellar medium
Noriega-Crespo, A.; Cichowolski, S.; Arnal, E. M. +3 more
Aims: We carry out a multiwavelength study to characterize the H I supershell designated GS 118+01-44, and to analyse its possible origin.
Methods: A multiwavelength study has been carried out to study the supershell and its environs. We performed an analysis of the H I, CO, radio continuum, and infrared emission distributions.
Resu…
Physical properties of Galactic Planck cold cores revealed by the Hi-GAL survey
Testi, L.; Molinari, S.; Zahorecz, S. +3 more
Context. Previous studies of the initial conditions of massive star and star cluster formation have mainly targeted infrared-dark clouds (or IRDCs) toward the inner Galaxy. This is because IRDCs were first detected in absorption against the bright mid-infrared (IR) background of the inner Galaxy, requiring a favorable location to be observed. By s…
DR Tauri: Temporal variability of the brightness distribution in the potential planet-forming region
Wolf, S.; Ratzka, Th.; Brunngräber, R. +1 more
Aims: We investigate the variability of the brightness distribution and the changing density structure of the protoplanetary disk around DR Tau, a classical T Tauri star. DR Tau is known for its peculiar variations from the ultraviolet (UV) to the mid-infrared (MIR). Our goal is to constrain the temporal variation of the disk structure based …
The radio continuum spectrum of Mira A and Mira B up to submillimeter wavelengths
Planesas, P.; Alcolea, J.; Bachiller, R.
Aims: We present new measurements of the flux densities at submillimeter wavelengths based on ALMA band 7 (338 GHz, λ0.89 mm) and band 9 (679 GHz, λ0.44 mm) observations to better constrain the origin of the continuum emission of the Mira AB binary system and to check its orbit.
Methods: We have measured the Mira A and Mira B continuum i…
Overlooked wide companions of nearby F stars
Scholz, R. -D.
Aims: We checked a sample of 545 F stars within 50 pc for wide companions using existing near-infrared and optical sky surveys.
Methods: Applying the common proper motion (CPM) criterion, we detected wide companion candidates with 6-120 arcsec angular separations by visual inspection of multi-epoch finder charts and by searching in prope…
X-ray and optical observations of four polars
Granzer, T.; Schwope, A. D.; Traulsen, I. +3 more
Aims: We investigate the temporal and spectral behaviour of four polar cataclysmic variables from the infrared to X-ray regimes, refine our knowledge of the physical parameters of these systems at different accretion rates, and search for a possible excess of soft X-ray photons.
Methods: We obtained and analysed four XMM-Newton X-ray obs…
Dust in a compact, cold, high-velocity cloud: A new approach to removing foreground emission
Kerp, J.; Lenz, D.; Flöer, L.
Context. Because isolated high-velocity clouds (HVCs) are found at great distances from the Galactic radiation field and because they have subsolar metallicities, there have been no detections of dust in these structures. A key problem in this search is the removal of foreground dust emission.
Aims: Using the Effelsberg-Bonn H I Survey and th…