Search Publications
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
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…