Search Publications
Recent (Late Amazonian) enhanced backweathering rates on Mars: Paracratering evidence from gully alcoves
Conway, Susan J.; de Haas, Tjalling; Krautblatter, Michael
Mars is believed to have been exposed to low planet-wide weathering and denudation since the Noachian. However, the widespread occurrence of alcoves at the rim of pristine impact craters suggests locally enhanced recent backweathering rates. Here we derive Late Amazonian backweathering rates from the alcoves of 10 young equatorial and midlatitude …
The relationship between plasmapause, solar wind and geomagnetic activity between 2007 and 2011
Pierrard, V.; Rauch, J. -L.; Décréau, P. +3 more
Taking advantage of the Cluster satellite mission and especially the observations made by the instrument WHISPER to deduce the electron number density along the orbit of the satellites, we studied the relationships between the plasmapause positions (LPP) and the following LPP indicators: (a) solar wind coupling functions B
Evolution of the brightest cluster galaxies: the influence of morphology, stellar mass and environment
Conselice, Christopher J.; Zhao, Dongyao; Aragón-Salamanca, Alfonso
Using a sample of 425 nearby brightest cluster galaxies (BCGs) from von der Linden et al., we study the relationship between their internal properties (stellar masses, structural parameters and morphologies) and their environment. More massive BCGs tend to inhabit denser regions and more massive clusters than lower mass BCGs. Furthermore, cDs, whi…
A radio map of the colliding winds in the very massive binary system HD 93129A
Nelan, E.; Marcote, B.; De Becker, M. +4 more
Context. Radio observations are an effective tool for discovering particle acceleration regions in colliding-wind binaries through detection of synchrotron radiation. Wind-collision region (WCR) models can reproduce the radio continuum spectra of massive binaries. However, key constraints for models come from high-resolution imaging. Only five WCR…
The density structure of the L1157 molecular outflow
Podio, L.; Codella, C.; Ceccarelli, C. +6 more
We present a multiline CS survey towards the brightest bow-shock B1 in the prototypical chemically active protostellar outflow L1157. We made use of (sub-)mm data obtained in the framework of the Chemical HErschel Surveys of Star forming regions and Astrochemical Surveys at IRAM (ASAI) key science programs. We detected 12C32S…
The structure of the Cepheus E protostellar outflow: The jet, the bowshock, and the cavity
Eislöffel, J.; Codella, C.; Benedettini, M. +7 more
Context. Protostellar outflows are a crucial ingredient of the star-formation process. However, the physical conditions in the warm outflowing gas are still poorly known.
Aims: We present a multi-transition, high spectral resolution CO study of the outflow of the intermediate-mass Class 0 protostar Cep E-mm. The goal is to determine the struc…
The photospheric solar oxygen project. III. Investigation of the centre-to-limb variation of the 630 nm [O I]-Ni I blend
Steffen, M.; Schmidt, W.; Ludwig, H. -G. +5 more
Context. The solar photospheric abundance of oxygen is still a matter of debate. For about ten years some determinations have favoured a low oxygen abundance which is at variance with the value inferred by helioseismology. Among the oxygen abundance indicators, the forbidden line at 630 nm has often been considered the most reliable even though it…
A steady-state supersonic downflow in the transition region above a sunspot umbra
Andretta, Vincenzo; Straus, Thomas; Fleck, Bernhard
We investigate a small-scale (~1.5 Mm along the slit), supersonic downflow of about 90 km s-1 in the transition region above the lightbridged sunspot umbra in AR 11836. The observations were obtained with the Interface Region Spectrograph (IRIS) on 2013 September 2 from 16:40 to 17:59 UT. The downflow shows up as redshifted "satellite" …
A Compton-thick AGN in the barred spiral galaxy NGC 4785
Gandhi, P.; Asmus, D.; Yamada, S. +5 more
We present X-ray observations of the active galactic nucleus (AGN) in NGC 4785. The source is a local Seyfert 2 which has not been studied so far in much detail. It was recently detected with high significance in the 15-60 keV band in the 66-month Swift/BAT (Burst Array Telescope) all sky survey, but there have been no prior pointed X-ray observat…
Exploring the Dust Content of Galactic Winds with Herschel. I. NGC 4631
Veilleux, S.; Müller, T.; Martin, C. +8 more
We present a detailed analysis of deep far-infrared observations of the nearby edge-on star-forming galaxy NGC 4631 obtained with the Herschel Space Observatory. Our Photodetector Array Camera and Spectrometer (PACS) images at 70 and 160 µm show a rich complex of filaments and chimney-like features that extends up to a projected distance of …