Search Publications
High-pressure, low-abundance water in bipolar outflows. Results from a Herschel-WISH survey
Liseau, R.; van Dishoeck, E. F.; Bachiller, R. +6 more
Context. Water is a potential tracer of outflow activity because it is heavily depleted in cold ambient gas and is copiously produced in shocks.
Aims: We present a survey of the water emission in a sample of more than 20 outflows from low-mass young stellar objects with the goal of characterizing the physical and chemical conditions of the em…
A non-pulsating neutron star in the supernova remnant HESS J1731-347/G353.6-0.7 with a carbon atmosphere
Werner, K.; Klochkov, D.; Santangelo, A. +3 more
Context. The central compact object (CCO) candidate in the center of the supernova remnant shell HESS J1731-347/G353.6-0.7 shows no pulsations and exhibits a blackbody-like X-ray spectrum. If the absence of pulsations is interpreted as evidence for the emitting surface area being the entire neutron star surface, the assumption of the measured flux…
Ionisation impact of high-mass stars on interstellar filaments. A Herschel study of the RCW 36 bipolar nebula in Vela C
Hill, T.; White, G. J.; André, Ph. +19 more
Context. Ionising stars reshape their original molecular cloud and impact star formation, leading to spectacular morphologies such as bipolar nebulae around H ii regions. Molecular clouds are structured in filaments where stars principally form, as revealed by the Herschel space observatory. The prominent southern hemisphere H ii region, RCW 36, i…
Importance of thermal reactivity for hexamethylenetetramine formation from simulated interstellar ices
Vinogradoff, V.; Duvernay, F.; Danger, G. +5 more
Context. Complex organic molecules are observed in a broad variety of astrophysical objects, but little is known about their formation mechanism. Laboratory simulations on interstellar ice analogues are therefore crucial for understanding the origin of these complex organic molecules. In this context, we focus on the thermal reactivity for the for…
OH far-infrared emission from low- and intermediate-mass protostars surveyed with Herschel-PACS
van Dishoeck, E. F.; Larsson, B.; Goicoechea, J. R. +10 more
Context. The OH radical is a key species in the water chemistry network of star-forming regions, because its presence is tightly related to the formation and destruction of water. Previous studies of the OH far-infrared emission from low- and intermediate-mass protostars suggest that the OH emission mainly originates from shocked gas and not from …
Herschel far-infrared observations of the Carina Nebula complex. II. The embedded young stellar and protostellar population
Preibisch, T.; Zinnecker, H.; Roccatagliata, V. +3 more
Context. The Carina Nebula represents one of the largest and most active star forming regions known in our Galaxy. It contains numerous very massive (M ≳ 40 M⊙) stars that strongly affect the surrounding clouds by their ionizing radiation and stellar winds.
Aims: Our recently obtained Herschel PACS and SPIRE far-infrared maps cover…
Herschel-HIFI observations of high-J CO and isotopologues in star-forming regions: from low to high mass
Braine, J.; van Dishoeck, E. F.; Johnstone, D. +9 more
Context. Our understanding of the star formation process has traditionally been confined to certain mass or luminosity boundaries because most studies focus only on low-, intermediate-, or high-mass star-forming regions. Therefore, the processes that regulate the formation of these different objects have not been effectively linked. As part of the…
Vertical broad-line region structure in nearby active galactic nuclei
Kollatschny, W.; Zetzl, M.
Context. Broad emission lines are emitted in the surroundings of supermassive black holes in the centers of active galactic nuclei (AGN). This region is spatially not resolved.
Aims: We intend to get information on the structure and geometry of this broad emitting line region based on line profile observations.
Methods: We model the rota…
Large-scale environments of binary AGB stars probed by Herschel. I. Morphology statistics and case studies of R Aquarii and W Aquilae
Blommaert, J. A. D. L.; Jorissen, A.; Ottensamer, R. +14 more
The Mass loss of Evolved StarS (MESS) sample offers a selection of 78 asymptotic giant branch (AGB) stars and red supergiants (RSGs) observed with the PACS photometer on-board Herschel at 70 µm and 160 µm. For most of these objects, the dusty AGB wind is not spherically symmetric and the wind shape can be subdivided into four classes. …
An analysis of star formation with Herschel in the Hi-GAL survey. I. The science demonstration phase fields
Paladini, R.; Piacentini, F.; Elia, D. +8 more
Aims: The Herschel survey of the Galactic plane (Hi-GAL) provides a unique opportunity to study star formation over large areas of the sky and different environments in the Milky Way. We use the best-studied Hi-GAL fields to date, two 2°·2° tiles centered on (ℓ, b) = (30°, 0°) and (ℓ, b) = (59°, 0°), to study the star formation activity in th…