Search Publications
Compact planetary nebulae in the Galactic disk: Analysis of the central stars
Villaver, Eva; Shaw, Richard A.; Stanghellini, Letizia +1 more
Context. We have obtained multi-wavelength observations of compact Galactic planetary nebulae (PNe) to probe post-asymptotic giant branch (AGB) evolution from the onset of nebular ejection. Here we analyze new observations from HST to derive the masses and evolutionary status of their central stars (CSs).
Aims: Our objective here is to derive…
The Herschel Virgo Cluster Survey. XIX. Physical properties of low luminosity FIR sources at z < 0.5
Bizzocchi, Luca; De Looze, Ilse; Baes, Maarten +12 more
Context. The star formation rate is a crucial parameter for the investigation galaxy evolution. At low redshift the cosmic star formation rate density declines smoothly, and massive active galaxies become passive, reducing their star formation activity. This implies that the bulk of the star formation rate density at low redshift is mainly driven …
Solar-cycle variation of the rotational shear near the solar surface
Schou, J.; Gizon, L.; Barekat, A.
Context. Helioseismology has revealed that the angular velocity of the Sun increases with depth in the outermost 35 Mm of the Sun. Recently, we have shown that the logarithmic radial gradient (dlnΩ/dlnr) in the upper 10 Mm is close to -1 from the equator to 60° latitude.
Aims: We aim to measure the temporal variation of the rotational shear o…
Template matching method for the analysis of interstellar cloud structure
Juvela, M.
Context. The structure of interstellar medium can be characterised at large scales in terms of its global statistics (e.g. power spectra) and at small scales by the properties of individual cores. Interest has been increasing in structures at intermediate scales, resulting in a number of methods being developed for the analysis of filamentary stru…
Long-term trends of magnetic bright points. I. Number of magnetic bright points at disc centre
Veronig, A.; Utz, D.; Hanslmeier, A. +5 more
Context. The Sun shows an activity cycle that is caused by its varying global magnetic field. During a solar cycle, sunspots, I.e. extended regions of strong magnetic fields, occur in activity belts that are slowly migrating from middle to lower latitudes, finally arriving close to the equator during the cycle maximum phase. While this and other f…
Subarcsecond bright points and quasi-periodic upflows below a quiescent filament observed by IRIS
Zhang, J.; Li, T.
Context. The new Interface Region Imaging Spectrograph (IRIS) mission provides high-resolution observations of UV spectra and slit-jaw images (SJIs). These data have become available for investigating the dynamic features in the transition region (TR) below the on-disk filaments.
Aims: The driver of "counter-streaming" flows along the filamen…
Dissecting a supernova impostor's circumstellar medium: MUSEing about the SHAPE of η Carinae's outer ejecta
Davidson, K.; Humphreys, R. M.; Mehner, A. +10 more
Aims: The role of episodic mass loss is one of the outstanding questions in massive star evolution. The structural inhomogeneities and kinematics of their nebulae are tracers of their mass-loss history. We conduct a three-dimensional morpho-kinematic analysis of the ejecta of η Car outside its famous Homunculus nebula.
Methods: We carrie…
Detailed photometric analysis of young star groups in the galaxy NGC 300
Baume, G.; Rodríguez, M. J.; Feinstein, C.
Aims: The purpose of this work is to understand the global characteristics of the stellar populations in NGC 300. In particular, we focused our attention on searching young star groups and study their hierarchical organization. The proximity and orientation of this Sculptor Group galaxy make it an ideal candidate for this study.
Methods:…
The environment of the γ-ray emitting SNR G338.3-0.0: a hadronic interpretation for HESS J1640-465
Castelletti, G.; Supan, L.; Supanitsky, A. D.
The supernova remnant (SNR) G338.3-0.0 spatially correlates with HESS J1640-465, which is considered the most luminous γ-ray source associated with a SNR in our Galaxy. The X-ray pulsar PSR J1640-4631 has been recently discovered within the SNR shell, which could favor a leptonic origin for the detected very-high-energy (VHE) emission. In spite of…
Far-infrared photometric observations of the outer planets and satellites with Herschel-PACS
Feuchtgruber, H.; Balog, Z.; Müller, T. G. +5 more
We present all Herschel-PACS photometer observations of